BPPC - Capacitors

[highpuff]

Hi!

I'm just began a short/long journey to repair one of my accelerator boards for Amiga 1200. So far so good, but one of my cards, the Phase 5 Blizzard PPC card has some bad ceramic Capacitors. Anyone here who knows the exact values on them the ones displayed on the picture below?



Thanks in advance!

[kipper2k]

Hi,

I will hazard a guess that they are 0.1uf decoupling caps. only way to know for sure is to remove and measure. Use a toothbrush and some isopropyl to see if they clean up before you remove them

[fitzsteve]

A wise man once told me that capacitors are unlikely to fail on these cards so probably not a cause for concern. What are the symptoms of your issues?

Unless you have reason to suspect them?

[highpuff]

@Kipper2k: Thanks, I will do that this week and test.

@fitzsteve: My computer won't boot with the card. I only get a black screen but KB etc works. The capacitors was the only visible ting I could find so why not change them.

When I think of it, doesn't the BPPC use alot more juice from the Amiga? Today I use Indivision AGA and a SD as harddrive with the standard small Amiga 1200 PSU. Could that we a reason?

[demolition]

It could very well be the PSU. You need a beefy PSU to run an accelerator like a PPC board. More than the typical 2.5A/3A. There are some 4.5A A500 PSUs out there. Alternatively people usually modify a PC PSU for use with the Amiga.

Edit: Ceramic caps like the ones you have, don't usually go bad although it can happen. I'd rather buy in to the PSU theory or dirty connectors.

[highpuff]

Tried with some Isopropyl alcohol and it worked great, see the result below. I will try to find a new PSU, preferebly Amiga 500 version 2 with 4.5A instead of 3A.

[kipper2k]

next step is to get some of the plastic scouring pads and clean off the edge connector. Oxides build up over time and interrupt the connections. You can try a higher rated PSU as well.