520STM: display blue tinted.

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susher
Retro freak
Retro freak
Posts: 10
Joined: Sat Oct 03, 2015 7:06 pm

520STM: display blue tinted.

Postby susher » Mon Oct 23, 2017 7:42 pm

I've a 520STM with a memory upgrade to 2.5MB which is outputing a very blue tinted display via both RGB and UHF. The blue is so enhanced that blacks are mid-blue. Other colours are output normally as far as I can tell.

Otherwise the machine is operating perfectly.

Any idea where the fault might lie? I'm guessing somewhere on the video output something's pumping more voltage onto the blue line. Shorted capacitor?

susher
Retro freak
Retro freak
Posts: 10
Joined: Sat Oct 03, 2015 7:06 pm

Re: 520STM: display blue tinted.

Postby susher » Sat Oct 28, 2017 3:47 pm

After taking the machine apart I reseated the Shifter (along with the piggy-back socket for the 2.5MB RAM expansion).

This has fixed the problem.


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