Search found 625 matches

by 1024MAK
21 Jul 2020 14:49
Forum: HARDWARE
Topic: No picture.
Replies: 92
Views: 8539

Re: No picture.

Okay, still with the power off, and still with the multimeter set to the 200 ohm resistance range. Now test between the following pins of the PSU DIN plug:

1 to 2

2 to 3

3 to 4

4 to 5

Report back your results.

Does your multimeter have a diode test range?

Mark
by 1024MAK
21 Jul 2020 10:00
Forum: HARDWARE
Topic: No picture.
Replies: 92
Views: 8539

Re: No picture.

All the following tests are to be done with the PSU and computer disconnected from the mains supply. Switch your multimeter to the 200 ohms resistance range. Test this is working by touching the probes together, the meter should indicate around zero ohms or just above (0.1 to 0.9 depending on the re...
by 1024MAK
20 Jul 2020 23:50
Forum: HARDWARE
Topic: No picture.
Replies: 92
Views: 8539

Re: No picture.

That’s definitely not good. C53 should not be more than 15V.

I’ll have to have a think about this...

Mark
by 1024MAK
20 Jul 2020 23:31
Forum: HARDWARE
Topic: No picture.
Replies: 92
Views: 8539

Re: No picture.

Also test across capacitor C53 (between the video board, the fuse and the internal edge-connector.

Mark
by 1024MAK
20 Jul 2020 23:27
Forum: HARDWARE
Topic: No picture.
Replies: 92
Views: 8539

Re: No picture.

Can you remove the fuse from the MTX main board and then test again on C51 and C56 please.

Mark
by 1024MAK
20 Jul 2020 23:19
Forum: HARDWARE
Topic: No picture.
Replies: 92
Views: 8539

Re: No picture.

Steven.G wrote: 20 Jul 2020 23:10 6.15 on C51 and 0.61 on C56.

Steve..
Both those are very low compared to what they should be :(

Mark
by 1024MAK
20 Jul 2020 22:58
Forum: HARDWARE
Topic: No picture.
Replies: 92
Views: 8539

Re: No picture.

Yes.

Mark
by 1024MAK
20 Jul 2020 22:52
Forum: HARDWARE
Topic: No picture.
Replies: 92
Views: 8539

Re: No picture.

BTW, that’s the two big cylindrical light blue things, one will have two wires coming out one end. The other will have one wire coming out each end.

Mark
by 1024MAK
20 Jul 2020 22:46
Forum: HARDWARE
Topic: No picture.
Replies: 92
Views: 8539

Re: No picture.

OK I went for it and masked all but pins 5 and 2 which gave me a reading of 23.6, which I think is what I should get. SO I assume the PSU is OK then. Tomorrow I'll have another go at removing the board for inspection. Steve.. If you can remove the keyboard and the video board, then (for some tests)...
by 1024MAK
20 Jul 2020 22:41
Forum: HARDWARE
Topic: No picture.
Replies: 92
Views: 8539

Re: No picture.

Dave wrote: 20 Jul 2020 21:58 Did you look at the “measurement points” section in the table?

I think it’s pretty clear - but then I wrote it :)
With a bit of help :mrgreen:

Mark