Let Q7950 out for the moment; is not really needed at all in fact.
Remove R7963-66 (one by one), until ALL_SYS_PWRGD goes high.
Keep in place R7967.
Remove R7963-66 (one by one), until ALL_SYS_PWRGD goes high.
Keep in place R7967.
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820-3115 Power Issues
- Thread starter hambook
- Start date
hambook
Member
Had to lift R7963, R7964, and R7965 then ALL_SYS_PWRGD went high. No change otherwise though, other than....
This last time I plugged the board in, I noticed this time it was only pulling 0.009A and I lost my power rails. Touched the board to move it around and something burned my finger on the bottom corner of the board. Looked under the scope and applied some alcohol and it was D5802 that was heating up. Replaced this from a donor, now I'm back where I was with ~0.220A from the PSU and the same rails present. This board is turning into a nightmare lol
This last time I plugged the board in, I noticed this time it was only pulling 0.009A and I lost my power rails. Touched the board to move it around and something burned my finger on the bottom corner of the board. Looked under the scope and applied some alcohol and it was D5802 that was heating up. Replaced this from a donor, now I'm back where I was with ~0.220A from the PSU and the same rails present. This board is turning into a nightmare lol
Which was the last resistor removed, before ALL_SYS_PWRGD going high?
Check its corresponding power supply.
Check its corresponding power supply.
So ALL_SYS_PWRGD is high if you put the other resistors back?
Which is the exact 3V3_S5 and 5V_S3 voltage?
Which is the exact 3V3_S5 and 5V_S3 voltage?
hambook
Member
Sorry, I misunderstood your process for removing the resistors, after reading some more threads I realized you wanted me to remove one, test, then replace that one and move onto the next - I removed one, then left that one off and moved onto the next.
I just re-tested by replacing R7964 and R7965 and checking with R7963 off, then replacing R7963 and removing R7964, then replacing R7964 and removing R7965. In all three tests, ALL_SYS_PWRGD stays low, only if I remove all 3 resistors does it go high.
3V3_S5: 3.330V
5V_S3 : 3.345V
I just re-tested by replacing R7964 and R7965 and checking with R7963 off, then replacing R7963 and removing R7964, then replacing R7964 and removing R7965. In all three tests, ALL_SYS_PWRGD stays low, only if I remove all 3 resistors does it go high.
3V3_S5: 3.330V
5V_S3 : 3.345V
Check L7100 amd L7630 voltage, when all 3 resistors removed.
"5V_S3 : 3.345V"
Ooops, I meesed this.
So check all components 5V_S3 related, near U7200.
Ooops, I meesed this.
So check all components 5V_S3 related, near U7200.