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

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Apex 43 inch tv

I am inquiring for an apex 43 inch tv that someone posted in the ads where i live and they said it has a small white line going through the middle of the screen. They said that someone told them that they need a convergance for it. What is this convergance and how do i fix it or get it?

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Re: apex 43 inch tv

Convergence is when you aim all three of the projectors, your tv has three, so that the images they produce all line up with each other. This usually doesn't generate a white line across the middle of the screen though, there is a button on the front panel of your set that automatically converges the three projectors, you can try using that.

Posted on Dec 14, 2007

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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...

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Apex gb4308 43 inch projection tv

This is not my main field of expertise, in any case here is the link for a solution to same problem and same model. According to expert the problem is related to vertical chip fault.

hope it may help you


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3d picture

Go to this Blog. It "should " solve the problem.
Really, Really simple, do it your self solution !!
Instructions and pictures included :D

This blog covers many makes and models with many issues solved, just with that one solution
Give it a try, it's free and simple :D

Hope the blog helps you.


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Jul 21, 2007 | Apex Digital GB43HD09 43" Rear Projection...

1 Answer

Apex model#GB4308

If you mean a horizontal line going left to right across the center of the screen and it's intermittent then a tech should be able to fix that one on a service call fairly easy... The vertical IC in that unit, IC N301, is a TDA8351 and it most likely has some poor solder connections due to heat stress - we call ring cracked - thus the problem sometimes corrects itself temporarily. While he's coming out anyway ask him ahead of time to bring the following: Two resistors 1.0 ohm 2 watt and a cap 3300 microferet 25 volts and his DMM & ESR meter. Ask him to ESR test C863 this is a high failure cap and test R370 & R371 in the supply for change in value. Shouldn't be too much to repair - and simply ask ahead of time what they charge for a service call, and if they think they can correct such a problem (ring cracks on the solder connections of your vertical IC) on-site. If you're not too sure where to begin your research for a qualified shop try NESDA at: Good Luck Bill

Jun 13, 2007 | Apex Digital GB4308 43" Rear Projection...

1 Answer

Apex gb4308 multi colored horizontal bow in middle or screen.

This is not an "STK" problem. Your problem is VERTICAL. You need to check your vertical chip for damage CN301 and check around it for any bad parts or loose connections. I've seen loose connections on the chip itself cause it to self-destruct.

Apr 11, 2007 | Apex Digital GB4308 43" Rear Projection...

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