68kMLA Classic Interface

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Macintosh Classic with horizontal interference
Posted by: Plasticoat on 2021-02-06 07:25:49
Hi all,

this has been totally recapped, analogue and logic, but I’m getting what only can be described as interference on screen, both sides.

I expect you’ll tell me it’s a cold joint somewhere, I just cannot narrow it down,

any help would be much appreciated,

thanks

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Posted by: Plasticoat on 2021-02-06 22:41:49
Ok so problem solved, PP1 Phier replaced,

wht da ya know 😉

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Posted by: cheesestraws on 2021-02-06 22:43:03
Well found!
Posted by: techknight on 2021-02-10 09:02:39
What is a PPI Phier? 
Posted by: 8tto on 2021-02-16 09:45:44
I think Phier is the brand name on the trim-pot 🙂

Posted by: Cinan on 2022-06-08 19:38:35
I have the same problem, what lead you to PP1 ?
Posted by: Plasticoat on 2022-06-08 22:23:58
Not being sarcastic , the compact Mac forum, I did a search and from what I remember I was kinda pointed in that direction .

you may want to de solder pp1 and apply fresh solder, It cannot hurt, I now replace as I have a small batch at hand so have made it part of the routine 👍
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