[SOLVED] 820-00165 dropping voltage on PPDCIN_G3H

[ajdoc]

Board had very small liquid damage around U7100.

PPDCIN_G3H is dropping to around 5V then spike to 8V-11V and drop within a few seconds to 5V and spike again.
Replaced U7100 just in case but still same results.
Tested with a few DC boards.

Same voltage results on fuse on DC board.
When DC board is not connected to the main logic board voltage is correct and stable.

Any ideas guys?

 

[aprendiz]

Resistance between pins 17/18 and 27/28 from U7000???

 

[ajdoc]

17/18 3.4 Ohm
27/28 9.6 M Ohm

 

[SMMRepair]

edited for totally incorrect answer!

 

[dukefawks]

What? How is a dead U7100 (NOT U7000) causing the pin 27/28 wrong reading?????

This is just a corroded resistor R7121/22 or the traces between them and U7100/R7120

 

[ajdoc]

It was corroded R7180.
Problem solved - many thanks for help.