Re: WG6100 no HV

I had a WG6102 doing something similar a number of months ago and
it wound-up being cold solder. I literally replaced over half of the parts
on the HV PCB and still no good. It would heat up and then fade away.
I finally pulled it and literally replaced every single solder pointon the
entire HV PCB. Plugged it back in and it has been rock solid every
since!

When it fades out, trying hitting the frame of the monitor in several
different places. If I did this to mine, the picture would come back for
just a moment (a flash to possibly a second or two), but it was enough
to prove my theory.

Scott C.

Pinx wrote:
> Hi Mark,
>
> after replacing lots of components in the HV section, it went from
> having no HV all the time to, starting up from cold and working, from
> anywhere from 2 to 5 minutes, to which the image blooms for a second
> and then dissapears, which is obviously due to the HV dropping off to
> zero. If i leave it for 20 mins or so, i can turn it back on and it
> will do it all over again. This suggests to me that something is
> failing under load or heat, unless someone knows otherwise.
>
> I took those measurements you asked for when it lost its HV, so you
> have the readings from when it is faulty.
>
> I took the HV cage out of my Black Widow and fitted it to the Star
> Wars and it plays perfectly as it should, so that rules out my game
> pcb, deflection pcb, AR2 and power brick, not to mention all the
> chasis mounted transistors (though these are all new anyway) So it has
> to be something on the HV pcb. As i think i mention'd before when the
> fault is occuring my B+ voltage is only 28 volts instead of 180 volts
> (at pin 5)
>
> I'll go check the voltage across ZD901 today when the fault is
> occuring and see what it reads. i have replaced alot of the resistors
> (ones i had in stock) but there are quite a few i didnt have, these i
> lifted a leg out of circuit and then meter'd and they all gave good
> readings, in the past i have known resistors to go bad either OL or to
> have changed value, but could they change value under load and then
> return to their origional value when unloaded ?
>
> I will make a concerted effort ot dig out the scope...
>
> Thanx for the advice and confirming the spec of ZD903 and yes the
> schems for P329 would be handy, do you have them on pdf ?
>
>
>
> Pinx
>
>
>
> ----- Original Message ----- From: "Mark Shostak" <shostak@cinelabs.com>
> To: <vectorlist@vectorlist.org>
> Sent: Saturday, April 07, 2007 11:48 PM
> Subject: Re: VECTOR: WG6100 no HV
>
>
>> I'm a little confused. Is this unit totally dead, or does it cycle on
>> and off,
>> or are those two different units. I believe you mentioned both, and
>> I'm just
>> trying to keep them straight.
>>
>> The 12.6v is good info. Also would like to know about ZD901.
>> The 50v on Q900-E is what I would expect when it's not running, but that
>> should go down, once you start getting high voltage.
>>
>> Need to know the correct symptom, and as a heads-up, you probably
>> want to start
>> digging for the scope.
>>
>> Thanks,
>> -Mark
>>
>> P.S. Some things are the same, all over the world...
>
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Received on Sun Apr 8 11:56:04 2007