820-2849 green light no fan spin

[protocold]

removed F7040/F7041, pin 1 pad is 8.35v

However, put F7040/F7041 back on, pin 1 would become 2.04v

also measured L7330 is shorted to ground.

 

[2informaticos]

Do you mean the short is on the pad 2 of F7040/1?
Can we know the exact ohm value?
Compare it with the readings on all big coils of the board.

 

[protocold]

yes short is on the pad 2 of f7040/1

Do you mean the ohm value of L7330? It is 0 ohm to ground.

Or are you refering to ohm value of others? do I remove the F7040/1 again to measure?

 

[2informaticos]

You said the short is on the system part; of course it appears on L7330 ONLY when you solder back F7040/41.
I talk about secondary power supplies, the other big coils from the board.

 

[protocold]

all big coil diode mode reading (Red on ground)

L9710 447
L7795 427
L7260 309
L7220 328
L7031 350
L7030 350
L8020 003
L7425 042
L7415 042
L7630 016
L7330 0
L9560 87
L9510 122

I also measured C7325 and the short come from pin 2 side of it only. pin 1 is not shorted.

Bad Q7335?

 

[2informaticos]

Remove Q7330 and check if short goes off from PPBUS_G3H.

Lift L7330 one side and see where its short remains.

 

[protocold]

Removed Q7330, short is gone.

Replaced Q7330, fan started to spin. Confirmed this board is working now.

Thanks!