Hi there! I have an old iMac G4 that we've had as an ornament at work for many years, I just brought it home and noticed it was dead, completely lifeless.
At first I replaced the PRAM battery without effect, then I've tried troubleshooting the PSU which does not seem to output anything (but 220V reaches the board)
Visually it looks ok, the board is the PSCF161101A.
I've desoldered all the caps and I intend to replace them but I've been seeing various mentions of an IC failing on these boards and I want to have a running start in case new caps doesn't do it.
TechKnight has a Youtube clip where he fixes a similar board by replacing something called TDA4863 I think
On the PSCF161101A there is a vertical green PCB that has an 8-legged chip labelled "393" and "253A", I've also seen references to these failing but very unsure.
So what I'm looking for is likely / plausible error sources. I'm not very good with electronics but I can solder somewhat decently and troubleshoot with a little handholding =)
At first I replaced the PRAM battery without effect, then I've tried troubleshooting the PSU which does not seem to output anything (but 220V reaches the board)
Visually it looks ok, the board is the PSCF161101A.
I've desoldered all the caps and I intend to replace them but I've been seeing various mentions of an IC failing on these boards and I want to have a running start in case new caps doesn't do it.
TechKnight has a Youtube clip where he fixes a similar board by replacing something called TDA4863 I think
On the PSCF161101A there is a vertical green PCB that has an 8-legged chip labelled "393" and "253A", I've also seen references to these failing but very unsure.
So what I'm looking for is likely / plausible error sources. I'm not very good with electronics but I can solder somewhat decently and troubleshoot with a little handholding =)
