old model 464 with garbled screen patterns

[salvogendut]

I got this machine a few weeks ago. It most likely had been stored in a damp place and it showed. Initially it seemed to be working well but the characters in the screen looked a bit off , like they had some 'ghosting' effect. Also some garbage showed up on screen randomly. The power connector also seemed to be not ok and if I touched the machine would glitch and power off and on again, it was wobbly. After I gave I gave it a clean it powered on normally just once more and as I touched the wobbly power plug it powered off and when I powered on again it shows just a garbled screen with some patterns. The patterns seem to change at every power on. Sometimes the border is a different color. Any idea? See pics

[Bryce]

Hi,
     the ghosting and dots are due to the video converter you are using, not a CPC issue. The power socket is obviously very dirty and/or has bad solder joints. Fix the power socket first and then see if you still have problems. If the patterns in the last pics still come after fixing the socket, then one or more RAM IC's failed while you were testing it.

Bryce.

[salvogendut]

Hi,
    the ghosting and dots are due to the video converter you are using, not a CPC issue. The power socket is obviously very dirty and/or has bad solder joints. Fix the power socket first and then see if you still have problems. If the patterns in the last pics still come after fixing the socket, then one or more RAM IC's failed while you were testing it.

Bryce.

Hi,
Thanks for replying. I did manage to desolder and replace the power connector with a new one. The original one was rusted and very dirty. However the situation did not change, I still see the patterns on screen. Would a diagnostic rom help pinpointing the failed chips? I am waiting for one such cartridge to be delivered in the next week. 

[Rabs]

Does this help Garbled Screen Amstrad CPC 464 video failure.?

[McArti0]

40007 you can't use without radiator/cooler

[salvogendut]

Does this help Garbled Screen Amstrad CPC 464 video failure.?

Thanks for the interesting clip. I am planning to study it very closely

[salvogendut]

40007 you can't use without radiator/cooler

I am not. What you see is just the stripped down board after I tried to remove and then re-insert the GA in case there was anything amiss. I noticed this chip gets quite hot and I am not planning to use it long term without its insanely thermal paste smeared heat sink 

[salvogendut]

Would this kind of chip be ok as a replacement? I am trying to order some beforehand