820-00840 short on PP3V3_G3H?

ajdoc

Member
Diode mode PP3V3_G3H 0.0016V

5V 0A from charger.
Both CD3215 LDO outputs got correct diode mode readings.

PPBUS_G3H 0V (0.400V in diode mode)

Where to start?
 

2informaticos

Administrator
Staff member
Post exact ohm value for the short.
It is probably 2-3 ohm, low enough to heat something with 3-4V max.
Start with 1V and go high slowly, if needed; no more than 4V.
Do not forget to remove CPU heatsink.

Should be better to remove first R6999 and see where the short remains.
 

ajdoc

Member
R6999 removed.

R6999/1 resistance 21Ohm, 0.013V in diode mode
R6999/2 0.500V in diode mode

Because is not 2-3 ohm is still fine to inject voltage?
 

2informaticos

Administrator
Staff member
No need to inject voltage now; as the low value remains on the left side.
Lift L6995, to discard between U6990, or one of the 6x10uF caps...
 

ajdoc

Member
One of the CD3215 was getting warm.
Replaced CD3215 and all works fine.

Mega thank you for all details you always giving me in every thread - thats helps me a lot to understand how those boards works :)
 
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