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laptop desktop chip level repair help guide

IC Types In Laptop Motherboard

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In this paragraph, we are going to learn about IC types available In the career for Laptop Motherboard for laptops.

An integrated circuit(IC), sometimes called a chip or microchip, is a semiconductor wafer on which thousands or millions of tiny resister, capacitors, and transistors are fabricated.

An IC can function as an amplifier, oscillator, timer, counter, computer memory, or microprocessor. A particular IC is categorized as either linear (analog) or digital, depending on its intended application.

 

There are different kind of IC’s Laptop Motherboard.

 

SMD type IC for laptop repair from home

SMD Devices Laptop

Is a method for producing electronic circuits in which the chips are mounted or placed directly onto the surface of the printed circuit board (PCBs). Moreover, An electronic device so made is called a surface-mount device (SMD).

 

 

BGA type of IC

BGA Devices

It is a kind of surface mount package that is used in electronic products.

Firstly, It is used to mount integrated circuits such as microprocessors, FPGAs, WIFI chips, etc. Secondly, The pins are in the form of solder balls that are arranged in a grid-like pattern.

Lastly, It is used under the surface of the packages to increase the area used for the connections rather than just the periphery.

 

 

You can have benefit from having knowledge about digital electronics which is a must for a repair technician.

There are different kinds of ICs available from different brands like ITE, MAX, Intel, etc.

The IC maker uses specific diagrams of the circuit to make an IC that is not available publically. Only some diagrams of available ICs are available online.

We also provided some schematics for ICs you can check that.

 

 

 

 

 

You can also check our other laptop preparing help guides.

 

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Laptop Motherboard Digital Electronics

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In motherboard repairing whether it’s a laptop motherboard or mobile mother or any other motherboard, there are digital electronics present with it. This digital electronics drives the function of laptop repairing.

 

States of digital electronics

digital signals

 

Digital SIgnals have two basic states:

  • 1 (logic “high”, or H, or “on”)
  • 0 (logic “low”, or L, or “off”)

Digital values are in binary format, which also means 2 states.

A good example of binary is light. (on or off signal).

Light On Off

 

 

States of digital electronics in laptop repair

analog and digital signals

 

There are moreover two types of states in digital electronics,

  1. Analog Signal
  2. Digital Signal

Let’s see them one by one in the below paragraph.

In this paragraph, we are going to see what is an analog signal. Analog systems process time-varying signals that can take any value across a continuous range of voltages in circuits.

Moreover, Digital Systems process time-varying signals that can take on only one of two discrete values of voltages in circuits. Their discrete values are called 1 and 0. which are also called HIGH and LOW.

Ideally “no voltage” (e.g., 0v) represented as 0 and “full source voltage” (e.g., 5v) represented as 1.

Realistically “low voltage” (e.g. <1v) represents as 0 and “high voltage” (e.g. >4v) represents as 1.

 

 

How we achieve these discrete values in laptop motherboard digital electronics

electronic switch transistor

We achieve these discrete values in digital systems by using switches. We use transistor switches, which operate at high speed, electronically however in a smaller size.

The basic digital devices are called gates. Gates as their name suggests allow or block the flow of digital information. A gate has one or more inputs and produces an output depending on the input(s).

A gate is called a combinational circuit. Their most important gates are AND, OR, NOT.

 

 

 

 

 

You can also check for which are components we check for digital signals in the laptop motherboard.

 

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Laptop Motherboard Components – DisplayMonk

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The laptop is made up of small laptop motherboard components. That’s why laptop chip level repairing is called component level repairing. Every circuit has components. The main Laptop Motherboard Components – DisplayMonk is given below.

 

 

1. Resisters

Resisters in laptop chip level repairing

 

The resister in a laptop or any other circuit can be defined as, ” A resister is a component that  resists or oppose the flow of current.”

It also called basic components used in electronic circuits.

The unit of the resistor is called an Ohm. The location name is R. The function of the resister is do oppose to the current flow.

 

 

2. Capacitors

Capacitors in laptop chip level repairing

 

The capacitor can be defined as, ” A capacitor is a device that can temporarily store an electric charge. ”

One another thing is that the construction of a capacitor consists of two electrode plates facing each other but separated by an insulator between them.

Mainly its function is to store electricity or so-called electrical energy.

The unit of the capacitor is Farad and the location name is R. The function of a capacitor is to store electric current.

 

 

3. Crystal

Crystal in laptop chip level repairing

A crystal used in an electronic circuit is an electronic oscillator circuit that uses the mechanical resonance of vibrating crystal of piezoelectric material.

It uses piezoelectric material to create an electrical signal with a precise frequency. The location name is x,y.

The unit of measurement for Crystal is Hertz. Most importantly the function of a is to create frequency.

 

 

4. Coil \ Inductance

Coils in laptop chip level repairing

The coil in an electric circuit has one or more turns. They are mostly can be found in circular or cylindrical shapes.

The location name is L. Most importantly the function of the Coil is to provide electronic resistance or inductance.

 

 

5. Transformer

Transformers in laptop chip level repairing

A transformer is a static device that transfers electrical energy from one circuit to another by the process of electromagnetic induction. It is mainly used to either increase (‘step up’) or decrease (‘step down’) voltage levels between circuits.

The measurement unit is called a Volt for transformer. The location name is L. There can be found two winding in the transformer. The primary winding is input winding and the secondary winding is output winding.

Most importantly the function of a transformer is to transfer voltage and current and Transformer only works on AC current.

 

 

6. Diode

Diode in laptop chip level repairing

It is defined as a two-terminal electronic component that only conducts current in one direction. It occurs so long as the diode is operated at a specific voltage level. Lastly, The location of the diode is D.

An ideal diode will have zero resistance in one direction, and infinite resistance in the reverse direction. Secondly, the diode positive leg is called the anode and the negative leg is called the cathode.

Most importantly the function of the diode is to act as a rectifier and it also pass current in one direction.

 

 

7. Transistor

Transistor in laptop chip level repairing

A transistor is a miniature electronic component that can mainly do two different jobs which are it can work as an amplifier or a switch. When it works as an amplifier, it accepts a tiny electric current at one end (an input current) and produces a much bigger electric current. Transister is used as switching circuits also.

The location name for the transistor is PQ. The function of MOSFET is to switch or amplify.

Transister has three legs

  1. collector
  2. emitter
  3. base

They are two types of transistors

  1. NPN type
  2. PNP type

when the current is applied to the base Transister works as a switch. Then the emitter and collector start connecting each other and the current will flow from emitter to collector.

 

 

8. MOSFET

MOSFET in laptop chip level repairing

Mosfet has a full-form metal oxide semiconductor and also they work as electronic switches. It has three legs :

  1. Source
  2. Drain
  3. Gate

When the gate is triggered by MOSFET, the current passes from source to drain.

MOSFET works as signal amplification and switching circuit.

Secondly, The location of MOSFET is PQ and one thing to note is that there are two types of MOSFET type N Channel and P channel. Finally, To make a career in laptop repairing or start your laptop repair shop you must have knowledge of basic electronics.

 

In Conclusion Below Is The Overall Laptop Motherboard Components – DisplayMonk:

  1. Resister
  2. Capacitor
  3. Coil
  4. Transformer
  5. Diode
  6. Crystal
  7. Transister
  8. Mosfet

You can have benefit from having knowledge about digital electronics which is a must for a repair technician.

 

 

 

 

You can also check our other laptop preparing help guides.

 

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Laptop Chip Level Repair Help Guide

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For being a good laptop chip-level engineer it will be helpful to have this laptop chip level repair help guide. There are some basics for laptop chip level repairing that you must know how to troubleshoot laptop starting problems with guided information as laptop motherboards are costly. You must carefully repair them as there is always a chance of making them scrap while repairing.

Laptop Chip Level Repair Help Guide For Technicians

Mostly what happens is that person directly starts repairing the laptop motherboards. Moreover, because he is unaware of the basics he fails at repairing. so we are going to see 3 laptop chip level repairing know the basics of laptop chip level repair.

We are going to see them one by one.

 1. What is Electricity  :

electricity

Firstly speaking If you are not an electronic engineer like me this question will horror you, not kidding. Let’s learn it in simple terms.

Electricity is the presence and flowing of any electronic charges in one direction. These electronic charges are also known as Electrons.

It is the common form of energy we use to power our instruments like bulbs, tube lights, a fan, a washing machines, etc within our home.

Electricity is the flowing of electrons within a wire from negative to positive.

There are two types of currents created:

  1. AC Current
  2. DC Current

Firstly both AC and DC type of current describes the types of current flow in a circuit. In Direct Current which is DC the current flows in one direction.

Secondly in DC current, the current changes its direction periodically. In most cases for laptop chip level repairing, we will use a multimeter which will measure mostly DC current. AC current we use only for measuring current in SMPS or directing our light main plug.

2. Current and Voltage in laptop chip level repair help guide:

current and voltage

In this section, I am surely going to be talking about voltage and current. Voltages are called difference charges between two points. The unit of the force of an electron is called a volt.

Current is at which rate the charge is flowing. The unit for it is Ampere. Resistance is the tendency of a material to resist the flow of charge which is current. The unit of resistance is the ohm.

3) Ohm’s Law in laptop chip level repair help guide:

ohms law

Ohm’s law says that the voltage or potential difference between two points in a circuit is directly proportional to current, or electricity passing through the resistance and inversely proportional to the resistance of the circuit.

Most importantly the formula for Ohm’s law is V=IR.

Different Parts Comes In Laptop PC Repair

Below are the different parts which also come in laptop pc chip level repair

Below are the 13 common laptop problems and how to repair them in this laptop motherboard repair guide.

Symptoms Check These Things
Dim display Vin (18v) voltage at pin no. 38,39 on the LED screen, LED backlight bad, display cable
White display 3.3v on pins no. 2 and 3 enable signal at LED screen, LED screen bad
Heating problem Damaged or broken fan, Fan properly not cleared, Heat sink not connected properly or damaged, CPU or graphic chip
USB not working Drivers not installed properly, Check 5v DC on pin no. 1, Connector damage, PCH faulty
Network problem Check drives installed, Physical connector, Transformer is working properly, 3.3V and 1.2V DC should present on IC controller
Audio problem Drivers should install, Speaker Audio chip
Junk display Graphic chip, Cable is broken or LED/C=LCD panel is broken.
Wifi problem Check driver, Secondly, check for enable signal at pin no. 20 at wifi card (3 volt), wifi card may be faulty.
Battery not detected SM bus between SIO and battery track Battery or SIO.
Not working on battery Battery discharging MOSFET VIN battery charging pin
Not working on the adapter Vin section MOSFET, VIN battery charging chip.
Continues beep Keyboard short
USB not working Check 5volt across, check physical connector, Check PCH

You check for our other laptop repairing help guides.

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LCD And LED Section

LCD (Liquid Crystal Display) has a sandwich-like structure with liquid crystal filled between two glass plates.

TFT Glass has as many TFTs as the number of pixels displayed, while a Color Filter Glass has a color filter that generates color. Liquid crystals move according to the difference in voltage between the Color Filter Glass and the TFT glass.

The amount of light supplied by Black Light is determined by the amount of movement of the liquid crystals in such a way as to generate a color.

Difference between the LCD screen and LED screen Both work on the same LIQUID CRYSTAL cube concept.

The only difference is the Backlight source.

LCD use Florescent Lamp and LED uses an LED strip for the backlight.

The laptop LCD screen has two connectors one is 30 pins for LVDS data signals. Another is a small connector for the backlight connector. LCD panel requires 3 volts to work. If this voltage missing then you will find a white display problem. Backlight work on CFL lamp and this lamp require around thousand voltages.

The inverter is there to generate this high voltage. The inverter requires a total of two signals one is 3 volts enable signal and another is a brightness signal. DC 18volt power to the inverter circuit. If one of the signals or voltage missing dim display is there on the screen means no backlight.

For identification CED / LCD consider for example LP156W01, here LP is the name of the manufacturer, and 156 is the width of the display. If 156W word followed by H letter example. LP 156WH01 is called HD screen or if the 156W word is followed by an F letter such as LP 156WF01 then it’s full HD.

 

LCD Pin Out connections in laptop chip level repair help guide

There are two types of LED connectors

40 Pin Video Connector

Their pin information is as follows

Symbol Description
NC No connection
VCCS Power supply +3.3v
VCCS Power supply +3.3v
EE_VDD DDC +3.3v
NC No connection
EE_SC DDC clock
EE_SD DDC Data
Rx0- LVDS differential data input
Rx0+ LVDS differential data input
VSS Ground
Rx1- LVDS differential data input
Rx1+ LVDS differential data input
VSS Ground
Rx2- LVDS differential data input
Rx2+ LVDS differential data input
VSS Ground
RXC- LVDC clock data input
RXC+ LVDC clock data input
VSS Ground
NC No connection
NC No connection
VSS Ground
NC No connection
NC No connection
VSS Ground
NC No connection
NC No connection
VSS Ground
NC No connection
NC No connection
VSS Ground
VSS Ground
VSS Ground
NC No connection
LED_PWM PWM control signal of the LED converter
LED_EN Enable control signal of the LED converter
NC No connection
LED_VCCS LED power
LED_VCCS LED power
LED_VCCS LED power

Secondly, there is 30 Pin Video Connectors

30 Pin Video Connector

Their pin information is as follows

Symbol Description
NC Reserved
GND High Ground
1_N Complement signal lane 1
1_P True signal link lane 1
GND High speed ground
N Complement signal link lane 0
P True signal link lane 0
GND High speed ground
AUX_CH_P True signal auxiliary channel
AUX_CH_N Complement signal
GND High ground
LCD_VCC 3 volt
LCD_VCC 3 volt
LCD It is self-test signal
GND LCD logic signal
HPD Signal pin
GND Backlight ground
GND Backlight ground
GND Backlight ground
GND Backlight ground
ENABLE Backlight 3 volt
Brightness 3 volt signal
NC Reserved
NC Reserved
Backlight Power VIN volt 18 volt
Backlight Power VIN volt 18 volt
Backlight Power VIN volt 18 volt
Backlight Power VIN volt 18 volt
NC Reserved signal

 

DIM Display Problem

First Step:

Check 18 volts at pin 38,39 in 40 pin connector or at pin no. 26,27,28 in 30 pin connector. If it’s not found then check the display cable. If the display cable is good then check the fuse on the motherboard in the VIN section.

Second Step:

Check 3 volt at pin no. 35,36 on 40 pin connector or at pin 22,23 on 30 pin connector. If it is not found then check the display cable. If the display can be on then check the LID sensor. Thirdly, If the LID sensor is ok then check these signals coming from PCH or GFX chip or give 3 volts to these pins from the LCCVDD pin.

Third Step:

Check fuse at LCD panel. If the fuse is good at the LCD panel then finally check for the backlight chip which can be faulty.

White Display Problem

First Step:

Check 3 volt coming at pin no. 2,3 on 40 pin connector or at pin no. 12,13 on 30 pin connector.

Second Step:

Secondly, if the previous step not coming then check the display cable.

Third Step:

Finally, if both below steps coming false then check LCDVDD MOSFET which transfers 3 volts to the LCD panel.

Wifi Section in laptop chip level repair help guide

There are two types of WIFI ports. Which are PCI-e and mini-PCI-e ports. mini-PCI-e port comes with new generation motherboards.

RTC Section in laptop chip level repair help guide

It is responsible to store day, date, and CMOS settings. RTC section is part of PCH or CPU in the latest generation systems. 3-volt battery connected as a power backup and 32.7khz crystal used to generate a clock. After the RTCRST signal goes high means 3 volts, this section starts to function.

Follow the below steps if RTC section not working

Checkpoints for this section are:

  1. First check battery
  2. Secondly, check RTCRST which should be 3 volt
  3. In third step, check 32.7khz crystal
  4. Finally, check RTCVCC

LID Sensor Switch

There is a magnetic sensor in the laptop which is called LID sensor.

Signal of this sensor going to SIO when magnet close to this sensor we get zero volts and away from sensor its become 3 volts.

What problems occurs if the sensor bad

  • No power on
  • Dimm display
  • External display ok but no internal display

Laptop Fan And Cooling System in laptop chip level repair help guide

A laptop fan have normally three wires. The red color wire is for power 5 volt. Black color wire if for ground and Yellow color for feedback input to SIO checking Fan speed.

If the laptop fan is not working then first check whether 5 volts are there or not on the red wire. If it’s not coming then secondly check MOSFET which delivers 5 volts.

SSD

SATA (or S-ATA) stands for Serial Advanced Technology Attachment and is the most commonly used interface for data transfer between hard drives and storage devices.

The majority of all SATA SSD’s have a 2.5 inch format (approx. 10 * 7 * 0.7 cm), which is practical because it corresponds to the size of the notebook hard drives. This allows them to be easily integrated into some PC and most notebook drive bays.

mSATA SSDs

The smaller version of SATA SSD is mSATA, short for mini-SATA. Performance wise nothing changes with this form factor. SATA hard disks also deliver a maximum throughput of 6 GBPS. The only relevant difference is in size.

M2 SSDs

Almost simultaneously with SATAe the M2 form factor was introduced. At that time still under the term NGFF for Next Generation Form Factor. M2 SSDs come in an extremely flat, compact plug-in card format and are therefore preferred in mobile devices. The most common is the 2280 format, which means nothing more than 22 mm * 80 mm (optically comparable to RAM bar).

NVMe and AHCI Comparison in laptop chip level repair help guide

While SATA Express/AHCI has the benefit of legacy software compatibility, the AHCI interface does not deliver optimal performance when talking to a PCIe SSD.

This is because the AHCI interface does not deliver optimal performance when talking to a PCIe SSD. This is because AHCI was developed at a time when the purpose of the HBA in a system was to connect the CPU/Memory subsystem with the much slow rotating media-based storage subsystem.

Troubleshooting 13 common laptop problems in laptop chip level repair help guide

Below is a troubleshooting guide for 13 common laptop problems

  1. The Laptop Is Dead
  2. Laptop Adapter Charger Not Working
  3. Buy Instruments For A Laptop Repair
  4. There is a sudden restart in the laptop.
  5. fix the hard disk not working
  6. fix the laptop audio not working
  7. fix laptop USB not working
  8. fix laptop internet not working
  9. There comes a Blue screen of death.
  10. Complete blank monitor or screen for display
  11. installing the operating systems over laptop/desktop
  12. different software installations for educational and other uses
  13. Converting A Laptop Graphical To Non-Graphical
  14. Dell Laptop Giving Beeps Sounds

There is also a laptop repair career guide.

Also, you can find all kinds of laptop schematics bios and boardviews for free.

Lastly, You can get also more information about laptop schematics, boardviews, and bios on Wikipedia.

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Laptop Chip Level Repair Career Guide

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Guidance and help are a must to start to know about how to laptop motherboard repair. The most common information is for a Laptop Repair Work Career. To be a good laptop chip level repairperson you must get this laptop chip level repair career guide.

The laptop can be repaired at any time but need to have skill for it! Laptops have different categories of repairing like software level and we will also learn how to be a laptop repairman, card level which means replacing the parts, and laptop chip level repair career which is also known as signal level repairing.

 

How To Start Career In A Laptop Chip Level Repair?

you must be familiar with the laptop motherboards and the working of its different parts. This can be learned by taking online or offline classes at the institution.

A good laptop repairman can troubleshoot any error within laptop parts and it’s the motherboard.

The exact error finding and troubleshooting of it play an important role in the skill of a laptop repairman.

You can update your knowledge through the institute or online classes which will increase your chances of getting a good fix on laptop repair.

 

Is a laptop repairing job really worth it? 

A laptop repairman earns around $9 per hour. It can change from 15$ to 30$ depending on the skill you have for repairing laptops and laptop motherboards.

The job at top multinational companies like Dell, HP, and Samsung has the highest salary and scope in this field.

For a normal laptop repairing job at the retail store. There is no minimum education requirement for entering. Only how to learn laptop/desktop chip repairing will be helpful at the beginning and you will learn as you will get experience and work.

 

The Difficulty Level Of A Laptop Repair Work Career?

The career of a laptop repairman is different in the different sectors.

The average income for transcriptionists per month is $150 aka 10,000 rupees. You can learn new chip-level courses to increase the payment.

 

Benefits and Disadvantages Of Being A Laptop Repairman?

Benefits of laptop repairing professional:

  • Get a 9-7 fixed-job – As you are working with some shops with various laptop models and motherboards. You will get a good 9-7 job available near your location.
  • You will get good job satisfaction – There are not many laptop chip level repairmen available currently, you can get good money for laptop motherboards. At the start only you will have to sacrifice time and money to learn laptop repairing. You will get benefits from this sacrifice for time and money in the future with a good return.

The disadvantage of laptop repairing professionals:

  • Have to work hard to troubleshoot –
  • As working for troubleshooting the laptop problem is hard work. For beginners, if you are not bored with working hard for making a motherboard work you can consider this career.
  • You have to take responsibility for the laptop – You have been expected to take ownership of repairing it. If anything goes wrong with repairing any laptop, you will look less trustworthy in front of your clients.
  • Will have to learn always – Without updating knowledge, it will be difficult to solve new laptop problems. In that case, you should be going for a site like us.

 

What qualification is required to do a Laptop chip level repair career?

The basic to advance knowledge of electronics components will help you if not all. You must have an eagerness to succeed abuse you can have multiple times of fail in laptop repairing. Your eagerness to succeed will drive you to be a successful laptop chip-level repair person.

 

How much time is required to be chip level laptop repairman?

The time required is 6 months. I consider 3 months or less of training and 3 months of hands-on practice with different types of testing approaches. Then it’s up to you to dedicate to laptop repair.

 

Is it very difficult?

Yes, It is quite difficult not most. You have to be persistent to succeed in laptop repairing. You must have a wide range of knowledge of laptop parts and repairing to be successful in this field. It is not very difficult if you can do it consistently. There are some components like Resister, Capacitor, Coil, Transformer, Diode, Crystal, Transister, Mosfet you must study before starting the repair.

 

What is the income if I complete this course?

A good laptop repairman can earn around 120$ means around 8000 rs. at the start in India or worldwide. It is required for you to have good experience and clean skills to get a proper hike. The work should be good the laptop must be repaired for getting payment. But with persistence and hard work you can achieve it.

 

Tools required for laptop repairing

Any technician is not complete without the tools he uses. For leptop preparing especially for laptop chip level repairing some of the tools, you must have to repair the laptop motherboard. Obviously, you will not try any cheap substitute which can harm you (yes it can harm you) or your costly motherboard. Customers also come to a while so they require quality service. If you will not give another next person will give. There is competition in the market for laptop repairing. The following are tools used mostly for laptop chip level repair:

  1. A digital multimeter
  2. Twissers
  3. Hot Air Gun
  4. DC Power Supply
  5. Good Quality Flux (as you don’t want to damage your lungs)
  6. BGA Machine
  7. An Oscilloscope
  8. BGA Rework Station (if possible)
  9. Desoldering Pump
  10. Diagnostic Card
  11. Mini BIOS Programmer (non compulsary)
  12. SMD Machine
  13. SMD Tester (not mandatory)
  14. Universal BIOS Programmer
  15. USB Digital Microscope (noncompulsory)

 

Where I can apply for basic to advance levels of training for laptop chip level repairing?

We teach laptop repairing. You can WhatsApp us with your name, age, location, and payment details so we can enroll you. We are basically Mumbai-based. You can come here too for in-house learning laptop chip level repairing. We also offer online learning sessions.

for More information Whatsapp 8087435056 or email us at prasadbakare@gmail.com.

 

 

You can also check the basics for laptop repairing.

 

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Repair A Dead Laptop – DisplayMonk

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There can be cases when you find out your laptop is not working at all. We have all gone through the same phase. This is called a Dead laptop condition. we can fix it by repair a dead laptop – displaymonk.

Here are some steps and tips to follow to repair your Dead laptop as a laptop chip level repairman or enthusiast.

 

Guide for repairing a dead laptop :

Below is the guide for repairing a dead laptop.

Check 18Volt current at current sensing resister

The current sensing resistor is the gateway from the laptop input battery section to go through all laptop components.

If you found that this section not working as usual then go for check-in for Volt in section MOSFET or Vin chip.

 

Check 3Volt at SIO VCC or EC BIOS pin no. 8

The next step for you to perform is checking 3volt at the SIO VCC pin or pin no. 8 of EC bios. Check if 3volt current coming or EC bios pin no.8 giving current using a multimeter.

A multimeter is an instrument to measure the current in the circuit. If it’s not working properly then go for checking always voltage section which is the 3.3v and 5v sections.

 

Check the power button in 3v to 0v variation

The power button in a laptop is the one that provides a gateway of current to the next circuits in the laptop. Check for variation in multimeter 3v to 0v. If it’s not showing the variation then mostly your power button is bad. You can replace it or repair it with a technician.

 

Check for RSMRST (resume reset) for 3volt and PM-PWRBTN

In laptop chip level repair it is very important to have reset signals to work. PM PWRBTN is the signal to check for and also resume reset signal RSMRST for 3v. IF it’s not happening check EC RTS for 3v and also checks the 32.7KHZ clock for working.

IF it’s not showing or running check for signals :

  1. THRMTRIP signal
  2. ACIN Signal
  3. LID SENSER signal.

If it is failing to do so then do flash the EC bios ( there are two kinds of bios ). If even if the problem persists then you can conclude that SIO is bad.

 

Check SLP_S3(SUSB) and SLP_S4(SUSC)

Check for SLP_S3 which is also called SUSB and SLP_S4 which is called the SUSC signal. IF they don’t found then go for the VCCDSW3.3 signal. If the VCCDSW3.3 signal not coming then check for why it not coming.

VCCDSW3.3 coming but not SPL_# and SPL_4 which are important signals for the laptop not coming. then go for checking the RTC RESET signal and clock of the RTC crystal.

the previous step not coming then do check for 32.7khz crystal. If RTC RESET and RTC clock is coming the check for DPWROK signal is coming. If the signal is coming then heat the motherboard by putting it into OVEN or BGA.

IF done all previous all things still SLP_S3 and SLP_S4 signal not coming then you can conclude that PCH is bad.

 

 

Check SUSP, SYSON, VR_ON signal

Check for SUSP, SYSOn, VR_ON signals. May all laptops not have all of these signals. Do check signals which are available.

If any of the signals are not coming then you can conclude that SIO is bad.

 

 

Check related PWD circuit and output voltage at the coil

If previous all steps are working and still the dead condition is not gone then check all the related PWM ( Pulse Width Modulator Chips). And also check for proper voltages at coils.

Have a look at chip level laptop motherboard repair small components also for having a good idea about the circuit. If all of the above steps working then the dead laptop problem must be removed.

 

 

 

 

 

You can also check our other laptop preparing help guides.

 

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