Search results

Where did you get the extension cable for the logic board? I could use one of those.

Awesome! I think the clue was when you forced the output of UE8 to the UG6 PAL. I was thinking UE8 might be bad when that happened. Another one saved.

Take a look at pin 2, close to the pad. There's a line across the trace. Not sure what that is. Could be solder mask...

I'll say. Can you post a pic when it's cleaned up?

Connecting pin UE8 pin 12 to pin 13 is shorting the Vid(6) input to the Qh output-- forcing a signal to the PAL UG6. I'd double check every connection on UE8.

Depends on what the video looks like, UE8 usually is a vertical jailbar pattern on the screen. (Every Nth dot missing). can you get a pic of the video?

check around C7 and UF8 for trace damage or shorts? I think C7 is pretty close to a trace going to UF8

UG6, UE6, UE7 -- should be in sockets. video ROM too. Shouldn't be that bad-- try removing from the bad board first so you get a feel for it.

Did you try the video chips/ROM from a good board in this one?

To I used those too, no issues with them

C5 + connects to UB11, pin 15 and UB10 pin 15

I drew this up from the info I had-- please double check this and let me know if anything is incorrect.

Thanks @Byrd @joshc -- I'll start with a visual check and see if TattleTech detects it

I have a Rev A Thunder 24 that is dead. No output of any kind. I'd like to try to repair this, but I'm not sure where to even start. Does anyone have any suggestions or info on what I should look for? I have an old 20mhz scope and a meter. Might have an old logic probe around here somewhere...

The power supply is in a machine, but I can make a drawing from the info and pics I have.

Seasonic in the Astec case.

I would re-cap the analog board and power supply, or This thread has lots of info about using a modern power supply. https://68kmla.org/bb/index.php?threads/modern-psu-for-the-se-30.30945/ I did this on one of my SE/30's with a Seasonic SSP-250SUB. Installed it in the Astec case. If you have...

What are the voltages on power up, when you have no chime? Has any work been done on this machine-- re cap logic board or analog board?

Have you checked the power supply voltages? You can check them on the 19 pin floppy connector