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820-2507 does not respond to SMC_ONOFF_L toggle
- Thread starter protocold
- Start date
What is L7920 voltage?
Any pulse at PM_SP_S4_L, when trigger SMC_ONOFF_L?
Any pulse at PM_SP_S4_L, when trigger SMC_ONOFF_L?
Then S3 voltages should be there.
Check what happens with PM_SLP_S3, at same time.
Check what happens with PM_SLP_S3, at same time.
"PP5V_S3_REG = 0v"
Fix this first; other S3/0 voltages require it.
Check diode mode to ground at L7320.
If OK, check U7300 basic voltages; this chip fails a lot...
Fix this first; other S3/0 voltages require it.
Check diode mode to ground at L7320.
If OK, check U7300 basic voltages; this chip fails a lot...
Pins 11, 10, 1, 4.
If all good, change the chip.
If all good, change the chip.
Very likely bad chip.
"pin 10 = 0.036v"
Diode mode there?
"pin 10 = 0.036v"
Diode mode there?
Change the chip...
Did you solder new LTC3851EUD chip?
Do not reuse one from donor board.
Check all adjacent components and traces.
Pay atention to C7326, D7301, R7307/24/36.
Just in case, change Q7330/5.
Do not reuse one from donor board.
Check all adjacent components and traces.
Pay atention to C7326, D7301, R7307/24/36.
Just in case, change Q7330/5.
You can use MOSFETs from CPU/GPU power supplies; more powerfull than this one.
You can also check them outside of the board; if close/open correctly, don't change them.
You can also check them outside of the board; if close/open correctly, don't change them.