Re: WG v2000 help please

Carlos Rubio wrote:
> After replacing a broken HV diode, my v2000 worked briefly. However,
> after a few minutes I noticed that there was arcing at the HV diode.
> I shut the monitor down and added more silicon to the HV diode
> connections. After it was dry I powered it back up. There was no
> longer any arcing. However there was no picture, and after a minute
> or so R613 on the deflection board caught on fire. R618 was also fried.
>
> I replaced the fried components as well as several other components in
> the Y section of the deflection board. After doing this, the monitor
> will now power up without anything catching on fire. There is no
> picture. The continuity of all fuses has been verified. The spot
> killer is not on. I can hear vector chatter. The heater is glowing.
> The brightness and contrast controls do nothing.
>
> Following the troubleshooting guide in the FAQ I went ahead and
> replaced the HV diode AGAIN, and this time made sure the ends were
> well insulated before firing it up. However that made no difference.
>
> I don't have an HV probe so I can't check the HV at the annode. I can
> feel static on the front of the monitor and a piece of paper will
> cling to the front. I'm not sure if this is sufficient to prove that
> high voltage is present? I verified the voltages at J900 on the HV board.
>
> SO... should I concentrate my troubleshooting on the HV board or on
> the deflection board? Reading about the way this thing operates, it
> seems possible that something in the oscilator circuitry is faulty,
> perhaps fried by the arcing? I'm hoping I can rule out the flyback
> itself, since at least the secondary windings seems to be working, as
> verified at J900.
>
> Monitor gurus, please chime in. Thanks,
>
> Carlos
Sounds like you fixed the HV problem, a check is to leave it running for
a few minutes then check the temperature of the HV diode itself. It
should be at room temperature. If you have an IR probe that would be
better in case the insulation isn't as good as you think it is...

So, now fix the deflection board.

If you are concerned about the HV you can simply unplug it - once the
deflection board is running again (makes the correct noise/chatter, and
LED is off) then you can power off and again hook up the HV cage and see
if a picture appears...

John :-#)#

-- 
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Call (604)872-5757 or Fax 872-2010 (Pinballs, Jukes, VideoGames)
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