so, i got this machine as water damage there is no sign of it, inside the machine. i took out the board and made some measurements. ppbus, is 12.64v, i checked data lines, they are open. i checked smc_reset_l, and its fluctuating. pm_battlow_l is fluctuating too. my suspect is that the SMC is damaged, but i dont wanna mess with it, whitout a second opinion. so do i reball/replace SMC or where do i check?
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820-4924 not power on, orange/green light.
- Thread starter LetsFix
- Start date
PPBUS_G3H and 3V42 steady voltages?
You must get stable SMC_RESET_L signal.
Check U5110 area and post its voltages.
Test disconnecting TP/KB cables too.
You must get stable SMC_RESET_L signal.
Check U5110 area and post its voltages.
Test disconnecting TP/KB cables too.
Not too much things connected there.
First be sure R5100 is not affected by corrosion.
Next remove R7100 and see if SMC_RESET_L goes high.
J6100 is suspect too; you may need to clean, or remove it.
If still the same, change U5110.
For the last remains SMC.
You can try reballing it first...
First be sure R5100 is not affected by corrosion.
Next remove R7100 and see if SMC_RESET_L goes high.
J6100 is suspect too; you may need to clean, or remove it.
If still the same, change U5110.
For the last remains SMC.
You can try reballing it first...
If you get steady high SMC_RESET_L without R7100, then replace U7100.
If SMC_REESET_L went high after R7100 removed, didn't test if board starts that time?
I hoped you make the mentioned steps one by one.
Try to reball SMC again.
Use solder paste, not balls...
I hoped you make the mentioned steps one by one.
Try to reball SMC again.
Use solder paste, not balls...