Help with DE Simpsons Alpha-Numeric Display (down to +/-50V)

[Altan]

The alpha-numeric display on my DE Simpsons started acting funny. It
looked like it was out gassing, but it would only last a few second
(or maybe up to about 20) and then look great again. I was able to
see that the +/- 100V lines were going down to about +/- 50V when the
problem occurred.

I replaced the standard guys... resistors are R8 and R9 (39k Ohm 1
Watt) and diodes D6 and D8 (1N5228).

I thought the problem was fixed, but it has come back.

So... before I start rebuilding the entire power supply, any thoughts
on where I should go next? I'm thinking that the fact that both the
+100V and -100V lines are down at +50/-50V must be telling a smart
person something :)

Thanks in advance.

... Altan
www.aaarpinball.com

[Baraka]

Did you happen to pull the board out to check for dry solder joints?
Seems like the pins on the board may have some dry solder joints.
John

[Altan]

I had it out to replace the resistors and diodes... But was pretty
confident that would be the fix so I did not look close at other
parts... I agree it is worth a check or simply to reflow them. Thanks
for the thought.

... Altan
www.aaarpinball.com

[Altan]

Reflowed most of the connectors... nothing looked terrible, but a
couple looked potentially suspicious. It's working well again, but
I'll need to watch it as it took a little while to fail again after my
previous attempt.

... Altan
www.aaarpinball.com