820-3115 on/off loop

bighead

New member
Hello,

I've this board here with the on/off loop problem.
No liquid damage.

PP5V_S0 present when it tries to turn on for a sec. Fan spins up.
Every power rail comes up for a sec except CPUVCORE.
I tried different BIOS.

I've 1.2V on on Y2605, but I can't see it oscillating. I changed the crystal and U2600. No change.

Checked RTC circuit to PCH(R1800-R1803) and everything seems fine.

No short on PP5V_S0 or on S3 rails. SYSCLK_CLK32K_RTC is present.

ALL_SYS_PWRGD goes high - 3.3V

PP3V3_SUS is present.

Checked the resistors on the SPI line(R5110-R5112,R5123).

What am I missing?

Thank you.
 

dukefawks

Administrator
Not missing anything. You need to know the history, this usually doesn't "just" happen. Was it dropped, did they open it and it died?
 
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