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PowerBook Duo 280c no chime

glay78

Well-known member
Powers on light lid, no chime, no HDD activity and LCD not lit. What could be wrong?

I’ve already unplugged the PRAM battery and tested with or without ram. With or without HDD. Even tried resetting the power manager. 
 

 

androda

Well-known member
Could be capacitors, could be battery leakage. These old 68k laptops often need capacitors replaced, with the leakage causing potentially a lot of random issues.

 
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glay78

Well-known member
Could be capacitors, could be battery leakage. These old 68k laptops often need capacitors replaced, with the leakage causing potentially a lot of random issues.
There isn’t battery leakage, could be caps I’m suspecting too

 

glay78

Well-known member
try unplugging it while holding the power button, then plug it back in and attempt to power it on.
It doesn’t works, sometimes the light will turn off. Press power, lights on but nothing happens. Sometimes the light turn on and blink once every few seconds

 

Challenger 1983

Well-known member
as others have said it is most likely caps, I would suggest replacing the ones near the DC jack first and verifling that the problem is solved before tearing the display assembly open and attempting to recap 

 

glay78

Well-known member
Yes I think so too, just feeling weird, this board is actually a spare part unused but kept in storage for 20+ years. Even unused the caps will leak? Sigh 

 

Byrd

Well-known member
... is there a reason why it was shelved NOS for 20 years?  Might explain the GLOD (green light of death), a common issue with many PowerBook Duos and usually not related to caps.  Check also the output of your PSU and any SMT fuses near the DC jack.

 

glay78

Well-known member
... is there a reason why it was shelved NOS for 20 years?  Might explain the GLOD (green light of death), a common issue with many PowerBook Duos and usually not related to caps.  Check also the output of your PSU and any SMT fuses near the DC jack.


I bought a couple of PowerBooks all from storage, none of them works just good as parts. There is this box of spares for 230 and 280c duos, both NOS. Even has top plastic and rubber sides new. So I tried mixing them around to get it work. For the 230 it makes screeching noise when powered on. Nothing just noise and that seems like caps leaking problem.

I’ll check the fuse in a while.

 

glay78

Well-known member
Also only 1 of the 5 x duo charger from storage works. 1 or which still gives smoke when plugged in. 

 

glay78

Well-known member
as others have said it is most likely caps, I would suggest replacing the ones near the DC jack first and verifling that the problem is solved before tearing the display assembly open and attempting to recap 
will a faulty display prevent it from powering up?

 

glay78

Well-known member
Found U23 one of the pin has no continuity, I soldered a wire over and it chimes and startup now showing flashing disk. 
 

however this isn’t too stable, after a few tries it stops powering up again. Will take a look at it again later.

404F3806-098B-4059-AD61-FF2D115DF77B.jpeg

 

glay78

Well-known member
Alright time to recap after fixing the broken trace. I smell fish...even this board is new it has been in storage for 2 decades, once it powered up it leaked.

will need to hunt for a new display too. 

FDDD4FFE-8C07-472A-A06D-60359127E1FD.jpeg

 

androda

Well-known member
Yes indeed, the capacitors will leak whether they were actually powered up or not.  So NOS parts, still sealed, never used, stored properly... can still come right out of the bag with capacitors leaking and corroded traces on the board.  Sigh.

 

glay78

Well-known member
Yes indeed, the capacitors will leak whether they were actually powered up or not.  So NOS parts, still sealed, never used, stored properly... can still come right out of the bag with capacitors leaking and corroded traces on the board.  Sigh.
you are right, this is a spare part board and it still leaked. Look at the leak. 
 

E6F1DB8B-748F-439D-82C2-E150F93EE776.jpeg

 
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