820-3209 no vcore

G.Beard

New member
Board history: Liquid, attempted repair.

All the usual rails are fine.

Been all over testing this board am lost at this point.


L7550 to ground 1.5 ohm
L7510 to ground 2 ohm (get the same on donor boards but nothing working to reference)

PPVCORE_S0_CPU = 0v
PPVCORE_S0_AXG = 0v
CPUIMVP_TON = 0.7v
CPUIMVP_PGOOD = 0.5v


PPVCCAS_S0_CPU = 0.9v
PP1V05_S0 = 1.5v
PP1v8_s0 = 1v8



What do I need to be looking for please?
 
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G.Beard

New member
ALL_SYS should of course be there. There is a rail missing.....

Sure, I did miss one. R2805 was missing from the board (Not a no stuff right?) Fan spins now.
Now there is no chime, no mouse LED, no PRAM reset.... Now to find the issue there.
 
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G.Beard

New member
Yeah and how did that resistor end up missing? Inspect for more damage, there is more you missed.

eBay board. And yes clearly.

This board is really doing my nut.

Could this be SPIROM? Missing PM signal? PCH? Fucked up trace / Resistor / cap?

Here are few measurements but what do I need to be looking for please..... Any clues?

ALL_SYS =3v3
CPUIMVP_TON = 0.35v
CPUIMVP_VR_ON =3.3v
CPUIMVP_PGOOD = 0.06v

CPUIMVP_BOOT1G is 4.8v
CPIIMVP_BOOT1_RC is 4.8v
 
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