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Re: Black vertical lines on ST
Posted: 12 Sep 2021 19:36
by czietz
If you read the AtariForum thread, there I suggested checking the connection from the RAM chips to the Shifter. (... and I was right back then.)
Re: Black vertical lines on ST
Posted: 13 Sep 2021 11:07
by Steve
Thanks guys, after checking continuity from the shifter to the ram as suggested by
@czietz (pin 2 of every ram chip) I had no continuity on D3 (between ram chip U24 and pin 6 shifter) but after tracking the trace through the board it all seemed fine, then I realised it is the shifter socket which is at fault. I get continuity on pin 6 with shifter removed, continuity dissapears when shifter is inserted. I'll replace the socket next and let you know if it fixes it. Thx for all the help so far guys.
- PXL_20210913_100210846.jpg (165.31 KiB) Viewed 2321 times
Re: Black vertical lines on ST
Posted: 13 Sep 2021 11:37
by Steve
A picture tells a thousand words, thank you everyone I've learned a great deal during this. Also! I think we should add 'remove/replace any single leaf sockets!' to mandatory fixes :)
- PXL_20210913_103623248.jpg (331.16 KiB) Viewed 2314 times
Re: Black vertical lines on ST
Posted: 13 Sep 2021 11:40
by PhilC
:cheer: :cheer: :cheer: :cheer: :cheer: :cheer: :cheer:
Re: Black vertical lines on ST
Posted: 13 Sep 2021 12:57
by zChris
Good job! I wonder what can make it have no continuity when the chip is inserted.
/zChris
Re: Black vertical lines on ST
Posted: 13 Sep 2021 12:59
by Steve
zChris wrote: 13 Sep 2021 12:57
Good job! I wonder what can make it have no continuity when the chip is inserted.
/zChris
Because they are 'single leaf' (I think it is called) they can easily lose contact. Where as double leaf kind of 'clamps' the leg when pressure is applied.
Re: Black vertical lines on ST
Posted: 13 Sep 2021 13:19
by exxos
:bravo:
3M all the way ;)