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820-00850 dead 20v amp pulsing
- Thread starter yair37
- Start date
Check diode mode to ground at SSD rails with 0V.
Check output voltages for U7800 (SYM 1 OF 4), page 75.
Check diode mode to ground at LDO_RTC.
R7900 is really 0 ohm?
R7900 is really 0 ohm?
Maybe was broken/open; short (0 ohm) is its correct value!
Board still not turning on?
Check the other voltages, missing/pulsing before.
Board still not turning on?
Check the other voltages, missing/pulsing before.
"R7900 was short"
Doesn't this mean 0 ohm between its pins?
How much did you expect to get for 0 ohm resistor?
By definition, a short means 0 ohm; or very-very low value in resistance mode.
If now appeared LDO_RTC, but no other above mentioned power rails, then change U7800.
Doesn't this mean 0 ohm between its pins?
How much did you expect to get for 0 ohm resistor?
By definition, a short means 0 ohm; or very-very low value in resistance mode.
If now appeared LDO_RTC, but no other above mentioned power rails, then change U7800.
Did you change U7800?
Forget the unconnected points...
Forget the unconnected points...
I was expecting you to post the above mentioned power rails again...
Are you sure R7900 is good now (0 ohm)?
Check diode mode to ground at all small coils surrounding U7800.
Just in case, check all big coils too.
Check diode mode to ground at all small coils surrounding U7800.
Just in case, check all big coils too.