820-00239 ppbus short

[Kyle93]

Arrived with liquid damage mainly in speaker section of the board.

After replacing everything board was working fine. Stopped turning on again. 2.2 ohms on PPBUS_G3H

L7430/20 are both also 2.2 ohms. Does this automatically mean bad U7430/20?

Similar board with different issue also reads 2.2ohms on L7430/20 but much higher ohms on PPBUS_G3H

 

[2informaticos]

Check exact ohm resistance between PPBUS_G3H and L7420/30.
Two values possible, close to 0 (zero), or 4-5 ohms; then guess what happens...