CDTV boot problem

[utri007]

My CDTV stopped working. It has 30T 68020 accelerator and IDE (CF) HD.

It booted up normally, but my oringinal wired CDTV mouse didn't work and neither did remote controller.

I opened CDTV it and tested with mouse / joystick adapter, mouse didn't work with it either, except righ mouse button.

I take mouse adapter of, and put 252609 circuit back it's socked and CDTV didn't boot anymore.

It boots now to pink/purple screen. I also tested it with plain 68000 cpu, with same result.


I ques 252609 is responsible remote and mouse, but it there something else broken?

[giantclam]

I ques 252609 is responsible remote and mouse, but it there something else broken?

Hmmm --- my guess is Denise has gone bad ;^/

[Shadowfire]

Joystick/mouse signal path in the CDTV:
U8/Denise/8362 reads the digital joystick/mouse directional signals coming from U7.
U7/74LS157 switches the four digital lines that Denise sees between ports 1 & 2, which come from U75.
U75/650011 is a custom microcontroller, which reads the IR signals from the remote, and generates keyboard/mouse controls sent to the rest of the CDTV (joystick/mouse movement goes to U7)
The mouse/keyboard adaptor most likely bypasses U75, putting your mouse signals straight to U7. It's far more likely (given the limited information) that U7 is bad, not Denise.
Note that the 74LS157 does NOT have ESD protection. If your keyboard/mouse adapter doesn't have built-in ESD protection (i.e. its just a bunch of wires going directly to a DB9 with no ESD diodes) then expect this to happen again, if you reconnect the adapter.
Bad U7 cannot hang the machine, so something else was damaged while you were touching things.
Edit: I misunderstood your post with the above reply (thought you were using the joystick adapter all along), but it doesn't really change anything, just makes the warning about the joystick adapter irrelevant, and eliminates the U75 as the likely culprit.
I'd definitely replace U7 before touching U8, but first you have to figure out why you have a pink display.

[giantclam]

Originally Posted by Shadowfire

Edit: I misunderstood your post with the above reply (thought you were using the joystick adapter all along), but it doesn't really change anything, just makes the warning about the joystick adapter irrelevant, and eliminates the U75 as the likely culprit.
I'd definitely replace U7 before touching U8, but first you have to figure out why you have a pink display.

This was my surmise as well, and yes U7 should be checked ...but I'm thinking U8 is responsible for pink display in and of itself..

[utri007]

Originally Posted by Shadowfire

Joystick/mouse signal path in the CDTV:
U8/Denise/8362 reads the digital joystick/mouse directional signals coming from U7.
U7/74LS157 switches the four digital lines that Denise sees between ports 1 & 2, which come from U75.
U75/650011 is a custom microcontroller, which reads the IR signals from the remote, and generates keyboard/mouse controls sent to the rest of the CDTV (joystick/mouse movement goes to U7)
The mouse/keyboard adaptor most likely bypasses U75, putting your mouse signals straight to U7. It's far more likely (given the limited information) that U7 is bad, not Denise.
Note that the 74LS157 does NOT have ESD protection. If your keyboard/mouse adapter doesn't have built-in ESD protection (i.e. its just a bunch of wires going directly to a DB9 with no ESD diodes) then expect this to happen again, if you reconnect the adapter.
Bad U7 cannot hang the machine, so something else was damaged while you were touching things.
Edit: I misunderstood your post with the above reply (thought you were using the joystick adapter all along), but it doesn't really change anything, just makes the warning about the joystick adapter irrelevant, and eliminates the U75 as the likely culprit.
I'd definitely replace U7 before touching U8, but first you have to figure out why you have a pink display.

Thanks, some how this was cured itself. Frustrating at least. This setup was very stable until I installed ACE2 to it. It is now removed, but that didn't cure problems, it just started to work next day.