Acer Aspire E5-575G No display

Model : Acer Aspire E5-575G
Board id : DAZAAMB16E0 Rev:E

First, Laptop run with no picture. All coils have voltages expect PL2. I tried to flash bios and then laptop run normally. But after running for about 30 minutes, laptop has no display again. I try to falsh bios again but nothing change. For now, when press power key, cpu fan spin full speed with some seconds and then stop.
PL6013 - 5.27V
PL6012 - 3.42V
PL11 - 1.2V
PL15 - 1V
PL5 - 1V
PL17 - 2.49V
PL1 - 0.2V (Without Battery)
All other coils have 0V. Need help.

Hello!

Is your board UMA version, or with a dedicated GPU chip?

Board with a dedicated GPU chip.

Measure the voltages to ground on listed pins, when the machine is turned on.
- On pins 18, 21, 33, 69, 72, 77, 78, 118, 119 of KBC chip.
- On pins 2, 4 of chip U6.
- On pin 10 of chip PU21.

KBC chip pins
Pin 18, 21, 118, 119 - 3.42V
Pin 33 - 3.26V
Pin 69 - 3.27V
Pin 72 - 2.99V
Pin 77 - 3.1V
Pin 78 - 3.26V
I can't find U6 on my mainboard. I have two boardview of this model. One show U6 near CPU and other one show U6 near CMOS battery. But in my mainboard there is no IC in this two places. PU21 pin 10 is 3.3V.

Laptop is tuning on with display one time while i am testing. In windows Nvidia Graphic show error code 10. When I turn off and open it's no dispaly again. Separate graphic fault?

cygron написав:Separate graphic fault?

Yes, possible.
For the test, convert this board to the UMA version according to the following instructions:

Change discrete to uma according to your guideline. But problem still exit.

Measure the voltage to ground on coil PL2 with the board converted to UMA.

PL2 is 0V

- Measure the voltages to ground on both pins of 1kΩ resistor you soldered to convert this board to UMA.
- Measure the power consumption (in mA) of the board, when the machine is turned on with and without RAM memory connected.

Voltages to ground on both pins of 1kΩ resistor is 0V. I can't identify of the power consumption because laptop can't open with DC power supply. With DC power supply, 5v 3v is not present. It can only open with adapter.

Please, post a clear picture of that 1kΩ resistor with nearby surroundings.

cygron написав:[ Obrazek ]

Are you kidding?
And where you soldered the 1kΩ resistor???

Please, check the attached picture from post #6 and follow the instructions carefully.

So sorry for my mistake. I changed wrong resistor. Now i correct my mistake. Remove correct resistor and solder 1K resistor to correct place. But problem still exit. Laptop has no display. Voltages to ground on both sides of 1K resistor is 3.42V.

cygron написав:I changed wrong resistor. Now i correct my mistake.

Make sure you revert all inappropriate changes back to their original state.

If so, repeat the measurement from the post #8 and current consumption from post #10.

I'm sure. I revert all inappropriate changes back to their original state. PL2 is 0V. When press power key current comsumption is about 0.300 amp and then suddenly drop to 0.110 amp with or without RAM.

Are voltages still present on all coils, except PL2?