32-bit acorn hardware • Re: Acorn A500 repairs

Thanks
Took pictures & documented where they come from, still got a picture , everything seems to be working apart from the picture being pink where it should be white, I am thinking of soldering them back in as they must have been there for some reason , maybe the picture was pink before due to the bad soldering, If they were doing nothing then you would think the person who fitted them would remove them.

Possibly the person who fitted them was just trying to tweak the RGB levels for a specific monitor. However, there is a bunch of other patches that you have near the VIDC, which may suggest these were part of a wider upgrade/modification. If you want to get to the bottom of this, you could trace the circuit from the VIDC RGB pins, through to the RGB socket at the back, and compare this with the same for an A310 and A410/1 PCB, which were the successors of the A500.

If you are going to reinstate the two 70R resistors, I’d suggest shortening the legs as much as possible and using heat-shrink to cover any remaining exposed legs. Also find a third 70R resistor to fit to the last of the three PCB resistors in your photo, since it looks likely that something was soldered to the lower resistor in the past.

I am using an AK11 monitor with this.
I still think it is the RGB lead that is the problem I cannot find a proper pin out for the scart lead, the scart lead I have was an absolute mess (see pic)
as you can see the white wire is not even connected, it goes to the center pin (6) in the DIN plug, I have checked continuity on all the wires & they are OK, Does it need power to the scart socket ?
I have only put the connections from the DIN /SCART lead back in so if I get a good picture I can resolder to the good pins that are left.

Thanks for help and comments

Most modern (eg. LCD) SCART-enabled TVs require a 5v signal to switch them into select SCART-RGB mode, but the AKF11 doesn’t.

Statistics: Posted by steve3000 — Fri Mar 22, 2024 4:11 pm

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