Acer Aspire F5-571 DA0ZRTMB6D0 Rev.D. Brak obrazu

Witam jak wyżej, sprzęt startuje zasilania są.
Objaw jest taki ze po włączeniu, zapala się led, widać polaryzacje matrycy, bateria się ładuje, obrazu brak, po jakimś czasie jak cpu złapię troszkę temp wentylator rusza.
Płyta główna tylko i wyłącznie z zintegrowanym układem graficznym.
PS. po podpięciu monitora zewnętrznego na złączu VGA jak i HDMI objaw ten sam brak obrazu.
Patrząc na schemat nie mogę namierzyć czy zintegrowany układ graficzny w CPU ma osobne zasilanie.

Wgrałem inny bios z internetu ale objaw ten sam, dalej brak obrazu, tylko nie jestem pewien czy bios był dla płyty z zintegrowanym układem graficznym czy z zewnętrznym.
PL1 - 5V
PL2 - 1.35V
PL3 - 3V3
PL4 - 1.08v
PL8 - 1.7V
PL5 - 1.50V
Matryca
33,32 (pin zlacze matrycy) - 3.3V
36,35,34(pin zlacze matrycy) - 3.3V
39,40(pin zlacze matrycy) - VIN 19V

Measure the voltages on pins 15, 26, 27 of CN19(LCD)

cind12 napisal/-a:PL5 - 1.05V

This voltage is too low, it should be 1,5V.
Measure the voltages to ground on pins 1, 6, 13, 14, 15 of chip PU7.

Machine napisal/-a:Measure the voltages on pins 15, 26, 27 of CN19(LCD)

Pin 15 - GND
Pin 26 - 0V
Pin 27 - 0V
Q38
Pin 2,3 - 3,3V
Pin 5,6 - 0V

matic napisal/-a:This voltage is too low, it should be 1,5V

Sorry matic, i've put the wrong name of the coil in first post. There is 1.5V

- Measure the voltage to ground on pin 4 of chip U17.
- Measure the voltages to ground on pins 14, 22, 118 of KBC chip.

matic napisal/-a:- Measure the voltage to ground on pin 4 of chip U17.
- Measure the voltages to ground on pins 14, 22, 118 of KBC chip.

KBC 14,22,118 - 3,37V
U17 Pin 4 - 3,37V

Measure the voltages on all pins of Q38.

cind12 napisal/-a:Q38
Pin 2,3 - 3,3V
Pin 5,6 - 0V

Pin 1,4 - GND

The enable signals from the PCH contained in the APU are missing.
Try a reflow.

- Measure the voltage to ground on pin 25 of LVDS connector CN19, when the machine is turned on with and without LCD matrix connected.
- Measure the power consumption (in mA) of the board, when the machine is turned on with and without RAM memory connected.

matic napisal/-a:- Measure the voltage to ground on pin 25 of LVDS connector CN19, when the machine is turned on with and without LCD matrix connected.

With Matrix connected
Pin 25 - 0V

Withouth Matrix
Pin 25 - 0V

matic napisal/-a:- Measure the power consumption (in mA) of the board, when the machine is turned on with and without RAM memory connected.

With Ram 300mA
Without Ram 300mA

- Measure the resistance to ground on pin 25 of LVDS connector CN19, with and without LCD matrix connected.

Perform the following measurements when the machine is turned on with the RAM memory connected to the slot JDIM1:
- Measure the voltages directly on capacitors C76, C99, C127 (C127 is actually not soldered to the board).
- Measure the voltage to ground on pin 1 of chip PU5.