Lenovo G40-30 Does not turn on and trying to trouble shoot the problem.

[Drassh]

Note: Doing this with minimal to no knowledge on how to read a schematic
and just getting the hang on putting things together like a puzzle.

Lenovo G40-30 with a ACLU9 M/B Intel BayTrail M-Processor with DDRIIIL + NV (N15V-GM/N15S-GT) GPU Motherboard or as seen onboard, an ACLU9/ACLU0 NM-A311 Rev: 1.0 2014-03-12
I have this laptop in my hands that doesn't turn on. What I mean by this is that when its connected or on battery, then push the power button, The LED for power turns on
then shuts off. So what I've been able to do so far as to troubleshoot,
(*) change the Ram modular, nothing changes
(*) is take this laptop apart/clean and look for any visible sign of damage to the board.
(*) Check charging connecter cable for continuity, passes the test
(*) Check power button and flex for continuity, passes the test
Visually everything looks ok but who knows, my eye sight might be lying to me.
So, I look through my archives for the schematic to this laptop.
Following the flow of electricity (with pages 47, of the schematic), we begin with JDCIN1 (page 51), JBATT1 (on page 53), and JPWRB1 (page 45).

JDCIN1 (page 53) has a signal of APDIN that goes throw PF101 (7A_24VDC_429007.WRML) which turns to APDIN1. It then connects with PC101 (000P_0402_50V7K)
and PC102 (470P_0402_50V7K) capacitors to go through jumper PJ101 (JUMP_43X118) which turns to signal VIN, connecting to PC103 (70P_0402_50V7K)
and PC104 (000P_0402_50V7K) capacitors along the way. Voltage so far is 20.35V, good so far.

Now the signal Vin goes through PQ301 (AO4407AL_SO8) from pins 5-8 and out through pins 1-3,
which connects and goes in through pins 1-3 of PQ302 (SI4483ADY-T1-GE3_SO8). From here it goes out from pins 5-8 to connect to pin 1 of PR301 (0.01_1206_1%)
All is good so far and Voltage is still about 20.35V but when PR301 (0.01_1206_1%) connects to PU301 (Texas Instrument BQ24737RGRR Chip for Battery Charger Switch Mode)
through pins 1-2, I don't know what the voltage is anymore or from where it has to go out on PU301
(Texas Instrument BQ24737RGRR Chip for Battery Charger Switch Mode).

I found a manual on the internet but I'm at a lost here. If anyone can help me with figuring out how the current flows in the chips, it would be greatly appreciated.

Schematic from one of the users here and greatly appreciate it.
Re-uploaded:
https://drive.google.com/open?id=0B4...nd6U0RtbkFabEE

Some motherboard Pictures
https://drive.google.com/open?id=0B4...0sxSk9ZYlJvb0U

[Drassh]

Re: Lenovo G40-30 Does not turn on and trying to trouble shoot the problem.

An update to some progress made.
I checked pin 5 and pin 1 of PU401 and it gives me 3v. So I check the insulators and capacitors that a user in another forum suggested through out the motherboard. From pin 4, 9 (goes to ground like it should), and 10 of PU401 with the following components PL401, PC404, PC405, PC406, PC407 go to ground. Also components PC919, PC920, PC948, PC948 go to ground. I check pin 4, and 10 of IC PU401 when desoldered but it does not go to ground so I think that the IC is not the issue. I then check the pinout on the motherboard where the IC connects and it continues to lead to ground.

Another note that I believe is important is that PL401 heats up to 53 degrees Celsius (temperature measured with Fluke IR Thermometer) and PL402 to 49 C. The rest of the components range from 30 a 32 C.
PL401 gives me 14 ohms and PL402 gives me 53 ohms.

[emi kusrini]

Re: Lenovo G40-30 Does not turn on and trying to trouble shoot the problem.

Note: Doing this with minimal to no knowledge on how to read a schematic
and just getting the hang on putting things together like a puzzle.

Lenovo G40-30 with a ACLU9 M/B Intel BayTrail M-Processor with DDRIIIL + NV (N15V-GM/N15S-GT) GPU Motherboard or as seen onboard, an ACLU9/ACLU0 NM-A311 Rev: 1.0 2014-03-12
I have this laptop in my hands that doesn't turn on. What I mean by this is that when its connected or on battery, then push the power button, The LED for power turns on
then shuts off. So what I've been able to do so far as to troubleshoot,
(*) change the Ram modular, nothing changes
(*) is take this laptop apart/clean and look for any visible sign of damage to the board.
(*) Check charging connecter cable for continuity, passes the test
(*) Check power button and flex for continuity, passes the test
Visually everything looks ok but who knows, my eye sight might be lying to me.
So, I look through my archives for the schematic to this laptop.
Following the flow of electricity (with pages 47, of the schematic), we begin with JDCIN1 (page 51), JBATT1 (on page 53), and JPWRB1 (page 45).

JDCIN1 (page 53) has a signal of APDIN that goes throw PF101 (7A_24VDC_429007.WRML) which turns to APDIN1. It then connects with PC101 (000P_0402_50V7K)
and PC102 (470P_0402_50V7K) capacitors to go through jumper PJ101 (JUMP_43X118) which turns to signal VIN, connecting to PC103 (70P_0402_50V7K)
and PC104 (000P_0402_50V7K) capacitors along the way. Voltage so far is 20.35V, good so far.

Now the signal Vin goes through PQ301 (AO4407AL_SO8) from pins 5-8 and out through pins 1-3,
which connects and goes in through pins 1-3 of PQ302 (SI4483ADY-T1-GE3_SO8). From here it goes out from pins 5-8 to connect to pin 1 of PR301 (0.01_1206_1%)
All is good so far and Voltage is still about 20.35V but when PR301 (0.01_1206_1%) connects to PU301 (Texas Instrument BQ24737RGRR Chip for Battery Charger Switch Mode)
through pins 1-2, I don't know what the voltage is anymore or from where it has to go out on PU301
(Texas Instrument BQ24737RGRR Chip for Battery Charger Switch Mode).

I found a manual on the internet but I'm at a lost here. If anyone can help me with figuring out how the current flows in the chips, it would be greatly appreciated.

Schematic from one of the users here and greatly appreciate it.
Re-uploaded:
https://drive.google.com/open?id=0B4...nd6U0RtbkFabEE

Some motherboard Pictures
https://drive.google.com/open?id=0B4...0sxSk9ZYlJvb0U

Schematic from these link is for REV 0.2 not REV 1.0