My WG K4900 just died...AGAIN!!!

qbass187

Well-known member
Joined
Jan 17, 2010
Messages
3,228
Reaction score
189
Location
Suffield, Connecticut
Hey guys,
Last week I posted here about this same monitor and I figured out the HOT went bad and all was well.

Now, yesterday I go to turn it on and it's dead again...WTF!!!

The HOT is still good and I followed the Randy Fromm flowchart and I was getting around 170VDC from the ceramic resistor at R503.
The Flowchart then sent me to the "small wire jumper J33 at the 130V trace"...which I can't seem to find . There are NO jumper wires at all on the back of this thing.

I then tried to measure the voltage at the "metal case" at Q352 and couldn't get any reading...although I coun't get any reading on my other working K4900 either so I'm clearly doing something wrong here.

Any help would be greatly appreciated.

Thanks, ERIC
 
The jumper wire is probably just a little staple looking thing, it won't be on the back, it'll be on the top as a component. Instead of a resistor, it'll just be a straight piece of metal.... Have you recapped everything?
 
The jumper wire is probably just a little staple looking thing, it won't be on the back, it'll be on the top as a component. Instead of a resistor, it'll just be a straight piece of metal.... Have you recapped everything?

Hey Ron,
Yeah, I recapped everything about a week and a half ago and that's when these problems started. First, after I recapped it wouldn't work, I used teh Randy Fromm flow chart ad replaced teh HOT and it seemed to work fine...then a couple days agao I went to trunit on and nothing again. It's not the HOT this time because I'm getting around 170VDC from the resistor at R503.

The next step is to measure the voltage at "the metal case of Q352"...but I don't quite know how to do that...It would seem.
 
Find Q352 (probably a bottlecap transistor hanging on the side), put one probe on the top of it (the metal case) and then the black probe on the metal frame behind it. You'll notice there's a mica insulator behind it so it won't measure the same, it'll give you a DC voltage.
 
Back
Top Bottom