820-00928, 20V 0a

MacByte_Repair_

New member
Hello, I have an 820-00928. Board came in initially with corrosion on U6500 and U6550. Replaced those, have replaced U7000 and Q7030, and Q7040 (due to PPBUS_G3H low). No shorts on PPBUS_G3H.

PPBUS_G3H is 0.75 V and slowly increases. It's weird because it will keep increasing if I leave the probes on the board.

SMBUS_SMC_5_G3H_SDA-3.29V

SMBUS_SMC_5_G3H_SCL - 3.27V

I have measured all inputs to U7000 and they all seem to be the correct voltages. I'm running out of ideas.
 

MacByte_Repair_

New member
Board was 20v 0A but like an idiot I accidentally shorted to a nearby cap by pin 1 of L6900(I believe it was PPDCIN) Board is now 5V 0.145A, so I guess back to the boardview tomorrow. Just posting what you asked.

L6900 on both sides 0V( was 0 as well before shorting)

R7020 0.08V after short, which is probably my current problem. Unsure of value before short.
 

MacByte_Repair_

New member
I had 1.3 Ohms to ground on PP3V3_G3H. I ended up replacing UB300, UB400, and U3100. I now have 3.41V on L6900 with each port. I am currently stuck at 5V 0A, not looping on all four ports. I measure resistance as 11 kilohms to ground on PP3V3_G3H. I believe this is normal?
 
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