Odd G07 problem

ivanx

Member
Joined
May 10, 2012
Messages
365
Reaction score
16
Location
Illinois
Hey all - I've got a question regarding a G07-CBO I'm working on.

First off here's what I've done to the chassis so far. It initially had a large curl on the top half of the screen that couldn't be adjusted out.

- recapped including filter cap at c901 with 680uf 200v
- check/fixed R303, R306, R314, R317 with 390 ohms 1/4 watt
- fixed FR901 220 ohm 1/2 watt
- G07 sych mod applied
- horizontal width c515 swapped to 334k v200 from 534k v200

So the monitor fires up and now displays beautiful without curl but the horizontal width is short, about 3 inches of black on both sides of the screen. The horizontal width coil only adjusts out the width maybe a 1/2 inch. No matter what value I swap c515 to, it stays the same width. Then after about 5 minutes of the monitor on, c523 (1uf 250v) blows and the width is perfect!? I've replaced c523 twice with different brands so I don't think its a bad cap.

My worry is that there may be added stress on other components with c523 blown? I left it running for 5 hours with no problem in this state.
 
Yeah, the cap blowing was my own bonehead move. I had the wrong cap voltage at C511 -- 200v instead of the correct 250v. That was causing C523 to blow.

As for the 3 inches of black on the sides, after I shotgunned the following parts the width problem was gone. I'm not sure which part failed but they appeared to be within the correct ranges...

R520 / R510 / R420 / R525 / D507 / D504
 
Looked at another working GO7 and C511 - 47uf 160v...

Only 250v cap I see on the list is is C905 - 10uf 250v.

Thanks,

Mike
 
Ugh .. I must have a typo in my repair logs. I just copied and pasted into the response.

I'm guessing I meant to type C523 instead of C511... :eek:
 
Back
Top Bottom