Dell G3 3579 - brak obrazu na LCD, HDMI - jest

Witam,

Mam na stole DELL G3 na płycie CAL53 LA-F611P. Ktoś przy niej majsterkował i poszedł dymek Na pewno podwójna dioda ESD na liniach komunikacji USB była zwarta.

Na HDMI obraz jest, natomiast na LCD nie, nowa tasiemka i nowa matryca.

Nie ma nic na linii DBC_PANEL_EN tzn po włączeniu laptopa 0V, reszta napięć obecna na złączu EDP.

LCDVDD_LCD - obecne,
12 EDP_HPD - 2,5V
LCD_CBL_DET# - stan niski.
30 DMIC_DATA_EDP - 3,3V
31 DMIC_CLK_EDP - 3,3V


Test matrycy który idzie z KBC daje obraz. Ktoś coś mógłby podpowiedzieć? Brak DBC_PANEL_EN to słabo trochę :/

Wielkie dzięki za góry za każdą podpowiedź.

Measure the voltages on pins 1, 26, 27, 29 of JEDP1.

Machine ha scritto:Measure the voltages on pins 1, 26, 27, 29 of JEDP1.

1 - 19.5V
26 - 0
27 - 0
29 - 3,3V



L_BKLT_CTRL also 0V

Replace the bios and remember to save the old one.

Machine ha scritto:Replace the bios and remember to save the old one.

I can try but there is display on hdmi, and someone did this during cleaning cooling system. So I dont think that bios is the problem.

New BIOS nothing changes - still no display on LCD.


LCD test works fine

You have a problem with the PCH, you can try a reflow but for a lasting repair you must replace the PCH.

Machine ha scritto:You have a problem with the PCH, you can try a reflow but for a lasting repair you must replace the PCH.

I think its damaged, because someone did a shotrcut on USB and double esd diode was damaged and some how was 3V on comunnication pins.

Thanks for Your help, when I replace pch I will let You know.