Apex GB4308 43" tv have to set convergence each time I turn it on

I got a Apex GB4308 from a friend as it was having a vertical problem. I traced it down to a bad vertical chip and replaced it. Now I have full screen but until the tv warms up I have wavy edges on the edge of the pictures. like my menu for the xbox 360. That does go away as the tv warms up though. My main problem is that every time I turn on the tv I have to resetup the convergence. I have no idea what is causing it.

jhunding Feb 16, 2009

romeo20808's, where did you get the vertical chip, my apex gb4303 projection is having a problem with the whole screen is bowing.

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5,138 Answers

Replace your STK ICs and look for Bad capacitor by vertical IC 100uf 35v.

Posted on Feb 16, 2009

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well most of the modern tv today doesnt have vertical hold anymore.
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I HAVE A 51 IN APEX TV WHEN I TURN ON THE TV IT HAS PROBLEMS WITH CONVERGENCE IT HAS RED LINES BLUE & GREEN WHEN I GO AND GET THE REMOTE AND GO TO CONVFRGENCE ON THE MENUAL I PUSH RIGHT ON THE REMOTE...

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Jun 22, 2010 • Apex Digital GB4308 43" Rear Projection...

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Please have it taken care of ASAP. It definitely sounds like Cold Solder joints on the convergence IC's. Cheap repair now, if you stop playing it. Every-time the convergence goes out, the ic's struggle to bring it back in and can't and therefor over heat. so please have it taken care of Pronto. Apex used a Samsung chassis which was a good chassis in that PTV.

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Aug 19, 2009 • Apex Digital GB51HD09 51" Rear Projection...

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I have this TV and have fixed this issue. If you cannot adjust Red or Blue convergence, then your STK ICs are defective. The signal board or Digital convergence board is not able to adjust sig lines on the deflection board so pushing buttons does nothing. The STK's are your amplifiers for vertical and horizontal. This will require dissassembly and soldering. You'll need 2 STK392-020 IC's and 125v/5A pico fuse or buss fuse..

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Took me abit to realize it was a fuse on the power supply. This -25 line traces to W057/W058 next to the first STK chip. Explains the symptoms.

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From reading your question i have decided this isn't something you have any hope of fixing yourself. Take the TV to a service center/technician they will be happy to fix any "vertical convergence" issues you may have.

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Apr 27, 2008 • Apex Digital GB4308 43" Rear Projection...

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Lines going across is a little vague but there is always the problem with the electrolytics (caps) around the vertical, be sure and get the one on the power supply too. Just change all you can find(usually 4-5). Thre are 2 convergence ic's if you didn't change them both, resolder the other one.
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Feb 05, 2008 • Apex Digital GB5108 51" Rear Projection...

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Actually you have 3 problems. The two that you listed and the third which is: Apex does not support their units. Ask anyone who has tried to get any service. Your problem sounds like a bad digital convergence box. I fix this problem several times a week but on name brand sets. Cost is usually less than $100 for the part. Some problems with Apex equipment can be fixed if the part is a common off the shelf part. That is not the case with your problem. Apex equipment is cheap for a reason. All posts that I have read say that they do not last long and you can't get parts. That has also been my experience as a technician. We don't even accept Apex units for repair anymore. Next time spend the extra money to buy a name brand unit and it will more than likely be repairable.

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