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Amiga computer related discussion => Amiga Hardware Issues and discussion => Topic started by: darksun9210 on September 06, 2019, 09:38:40 PM

Title: CD32 doesn't boot, no video, dim power led - psu buzzing noise?
Post by: darksun9210 on September 06, 2019, 09:38:40 PM

Hi all,
CD32 was working fine, but.... it has getting more and more temperamental. It'd crash to a black screen, no video output, and the power light would be dim.
could usually remedy initally with a reset, then it came to need a power off and back on to come back to life.

now it won't boot at all. the power light is dim, no screen output on power on, but the psu is making a quiet buzzing noise i've not really noticed till i started trying to find what's wrong.
 i have plugged an A4k keyboard into the aux port to see if there are any caps flashes, but nothing. caps lock turns on and off when pressed like normal.

it's not been recapped, or put in the loft/garage - has always lived in the house since i bought it in 1993.

any help or advice to remedy?
Many thanks in advance

Title: Re: CD32 doesn't boot, no video, dim power led - psu buzzing noise?
Post by: save2600 on September 06, 2019, 11:42:34 PM

I'd try a different power supply...

Title: Re: CD32 doesn't boot, no video, dim power led - psu buzzing noise?
Post by: darksun9210 on September 08, 2019, 09:13:26 PM

Thanks, i did suspect as much. i've ordered a 4pin din to molex adapter from amigakit to double check.
i've measured the volts across the pins on the PSU i have, and it's 5.63 volts on the 5v line, and 11.87 on the 12v. it doesn't seem to spike on power on, as i've heard that the 5volt line can jump to 8volts before settling down to where it should be - if that doesn't sound worrying enough!

Title: Re: CD32 doesn't boot, no video, dim power led - psu buzzing noise?
Post by: RetroPassion on September 08, 2019, 10:52:04 PM

HI, A recap is a good start whatever as there are 2 1000Uf caps that a prone to failing, also as you can try reseating the Rom chip ;-) seen a few do that!!

Let us know!

Steve

Title: Re: CD32 doesn't boot, no video, dim power led - psu buzzing noise?
Post by: darksun9210 on October 17, 2019, 12:38:38 PM

no idea whats happened. But since the molex to 4pin din power adapter arrived from amigakit, it seems to have wanted to play ball since. As it's been as reliable as you like on the standard PSU. i've not actually tested running the molex adapter at all yet.

though i am investigating decent mains to molex PSU options if only to not kill anything in the longer term...

thanks for your time and help though :)

of course i bet as soon as i've typed this and submitted it, i'll go to fire it up and get nothing!
i'll keep the re-cap in mind though! and defo figure out a decent PSU if the TF360 ever comes to public release. :D

Title: Re: CD32 doesn't boot, no video, dim power led - psu buzzing noise?
Post by: RetroPassion on October 17, 2019, 01:46:35 PM

I cant stress enough about recapping the CD32, I get so many with bulging caps and leakage that infact it costs more to repair than to recap, its no different to servicing your car, its preventative maintinance. I have done an FAQ and photos. But glad she is working again!

https://www.amigapassion.co.uk/recapping-faqs/ (https://www.amigapassion.co.uk/recapping-faqs/)

Steve

Title: Re: CD32 doesn't boot, no video, dim power led - psu buzzing noise?
Post by: F0LLETT on October 23, 2019, 04:35:36 PM

Quote from: amigapassion on September 08, 2019, 10:52:04 PM

there are 2 1000Uf caps that a prone to failing

Not entirely true. They fail due to the silkscreen being printed wrong way around. If you replace them in the same way, they will vent.
Best to check the board with meter, to confirm they are in the correct way around. Besides, it not all of them. Some are printed correctly.