Re: WG6100 - no picture. - ok, this is weird....

I'm not sure, but I think there must be an old capacitor in the batch that is
slowly trying to form. I took measurements of the brightness this morning and
notice that each day the voltage is going up more and more. I'm starting to
get a faint picture at around 455 volts. - Which answers my last question in
case you wanted to know.

This might be something to keep in the back of your mind if you run across a
problem like this after a cap kit. Question is - which capacitor would most
likely be causing this problem? - that is, if it *is* a capacitor problem.

Matt

Matt Rossiter wrote:

> Well, here's another one I can't seem to figure out. I decided to take
> a perfectly working WG6100 and install a LV2000 kit along with new caps
> and power transistors. Everything seems to work right, but I get no
> picture now.
>
> Here's what I found so far.
>
> 1) LV2000 seems to be working ok. Before plugging all the connectors
> in, I was getting +/- 26 volts
> 2) Plugged everything now
> 1) Spot killer light does not come on
> 2) No fuses blow
> 3) I get ~18.5 Kv at the anode - so high voltage is working
> 4) Focus gets about 5Kv.
> 5) +25v on pin1 and -25v on pin8 of the P900 on HV cage
> 6) ~168v on pin 5 and about the same on red, blue and green guns
> 7) Deflection chatter is present and there is a faint glow in the
> CRT. Not as bright as I would suspect.
>
> 8) The only fishy thing I've found so far is the red wire coming
> from P901 of the HV cage to the neck board is only getting about 60v
> with brightness turned all the way down and about 160v with brightness
> turned all the way up. The schematic says it should be about 544v.
> Since it's coming from the brightness pot, it would make sense that the
> problem might be the brightness. Just to verify though, could someone
> confirm for me how high the brightness voltage should be before a
> visible picture appears?
>
> If it isn't the brightness, I'm completely lost on this one. Geez, all
> I did was install a cap kit. This monitor was perfectly fine before.
>
> Matt
>
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Received on Mon Apr 15 10:32:04 2002