Question about Apex Digital GB4308 43" Rear Projection EDTV-Ready Television

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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.

Posted by romeo20808 on

  • 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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1 Answer

ladywinn

ladywinn

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

Posted on Feb 16, 2009

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1 Answer

How do i fix the convergence on my apex gb5801
replace the convergence ICs very common problem for all rear projection Tvs that develope a convergence control issue.

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well most of the modern tv today doesnt have vertical hold anymore.
this symptom is caused by a trouble in the IC integrated circuit or the vertical oscillator circuit. let the service guy do the job if u dont know anything about this. good luck!

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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...
Tv convergence board is dead.The 2 STK convergence ICS and some or all it resistors are dead.These parts on the tv convergence board,must require replacing,to solved the tv picture convergence problems.The shop,will cost u $300-350 for parts and labors.

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Samsung Tantus projection TV 40 inches. the problem is that when it has worked for 5 minutes the text and picture is having a trace line that looks like a convergence problem in conventional CRT tv. any...
U have the early warning problems of the convergence problems.Do the manual or auto convergence adjustment until,u can't do it anymore.Replaced all the parts,that make the convergence board to work.

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

1 Answer

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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.

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

1 Answer

Apex out of convergence
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..

The STK's are mounted on 2 massive heatsinks. Can't miss it. Word of advice, LABEL the 3-4 Pin plugs B,G,R from left to right. These are your Vertical and Horizontal coils for each tube. Don't mix them up. I did and the tv survived luckily. Chances are if your STK's poped, then they took out the -25v line. Take out the power supply that is mounted vertically on the right. Look for a row of axiel lead fuses with "SOC 5000" printed on it. They look like white rectangular blocks with leads. Check them all. Particularly RF817. Sits next to RF814. The service manual lists it as a fuse and NOT a Resistor-Fuse like the label suggests. I found more than one typo like this. I replaced mine with a generic 125v/5A fast blow buss fuse. Soldered in a holder for it. Should work the same.

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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1 Answer

Apex gb4308 43in problom
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.

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

1 Answer

Convergence IC's
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.
Then check the value on R519 for me.

Apr 09, 2008 | Apex Digital GB5108 51" Rear Projection...

1 Answer

51 big screen apex tv, convergence or verticle IC?
If the lines are thin and close together running horizontally, it may be the vertical driver, but that usually takes out the resistor and sometimes the diode in the B+ for the vert. Also you must replace the caps that caused the problem in the first place.

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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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I have a large horizontal black line in the middle of the screen. The line comes and goes and sometimes a 2nd line is there at the bottom of the screen. It is connected to cable and we had the cable guy in and he said it is not due to their equipment. Also sometimes if you turn the main power button off when you try to turn the TV on again you get a blue screen. You then have to play with the power button turning it on and off until it finally comes in with wavy lines...after a while a clearer picture comes in and then the black line comes back. The black line sometimes disappears and then reappears. Seems like light colored backgrounds make it appear more often as do cartoons.

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