820-01700-A A2141

[lincev]

Hello, I received this device that does not turn on, very dirty fans, perhaps overheating...

I have checked the motherboard, it does not seem to be damaged.

no dfu mode

some voltages:

PPBUS_G3H=4.18v
3V3_G3H_RTC=0v
L9020=0v
L9030=0v
L9080=0v

mode diode to ground

PPBUS_G3H=386
L9020=433
L9030=386

any ideas? thanks !!

 

[2informaticos]

Remove F7000/1 and check C7050 voltage.

 

[lincev]

hi again

C7050=12.20v

 

[2informaticos]

"3V3_G3H_RTC=0v"
What about diode mode?

 

[lincev]

3V3_G3H_RTC=427 no short

 

[2informaticos]

Check diode mode to ground on all big coils; compare with good board.
Don't forget L9080/580.

 

[lincev]

I have double checked and all coils seem to be fine

 

[2informaticos]

Some secondary power supply pulls down PPBUS_G3H.
Can be even a leaky capacitor, or another IC connected there.

 

[lincev]

but is it possible to detect this fault?

 

[2informaticos]

Not easy at all...

 

[lincev]

ok thank so much!