Need help with Amiga CD32

[ori1a]

Dear Amiga Experts,
I need help identifying and solving following Amiga CD32 problem.
My Amiga CD32 encounters some video "glitches" and sometimes hangs.
Running "Amiga analyzer" memory test always ends with hang.
Video "Glitches" are encountered mostly with TF330 installed. Sometimes CD32 hangs even while starting "CD32 logo" screen, and video signal is lost.
See below images and videos from running WB and Amiga analyzer on my CD32 with TF330.
(Btw. Amiga has new capacitors.)
https://photos.app.goo.gl/UB4aKgXqY2AzcN6y8

 

[awmosoft]

What kind of PSU do you use?

 

[ori1a]

300W ATX - Seasonic SS300TFX with adapter


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[supaduper]

Looks like the Video circuit has a problem, is this using the Composite video ? and I take it you have tried the RGB on the TF330 riser

 

[ori1a]

All recordings are from RGB output on riser.

 

[supaduper]

Is it the same on Composite ?

 

[ori1a]

Almost the same. Composite is not so sharp.

 

[supaduper]

Then I will guess its either the Video DAC or Video encoder chip that is failing

 

[ori1a]

I will try to freeze Lisa chip to check possible micro damage.

 

[ori1a]

I solved the issue.
It was probably U2 cold solder.
I was suggested to freeze U4 but freezing U2 was significant. Then I hotaired U2 and problem has gone.
Thanks.

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