820-00165 a1466 no ppbus

[Jeffotskie26]

hello i got this with Q7180 is corroded no green/orange light
after i replaced q7180 2x still no G/O light
PPBUS_G3H 0.6V
PPDCIN_G3H 16.5v


U7100 17-18 3.6 ohms 27-28 20.2 ohms
1- 0
2 - 16.3
3 - 4.3
9 - 0
12 - 0.1
13 - 0.1
14 - 0.1
15 - 0
17 - 0
19 - 5
20 - 5
27 - 16

 

[2informaticos]

"12 - 0.1
13 - 0.1"
Missing 3V42_G3H.
Disconnect LIO flex (J9500) and check it again.
If still low, post U7090 voltages.

Check diode mode to ground at L7095.

 

[Jeffotskie26]

found full short on l7095 pin2
LIO flex, l7095, U7090, u7100 removed still shorted
injecting 1.1v 3V42_G3H found smc chip is overheating (infrared cam)
after i removed smc chip shotcircuit is gone.

need to replace smc chip?

 

[2informaticos]

Yes, from donor board...