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

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Apex model#GB4308 I geta 6 inch wide line in the middle of tv at intermittent times sometimes all day I will get it,other only at night etc,,I can afford a new one I am disabled with low income Please Help!

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  • pop57 Nov 20, 2007

    I have the same problem with the Horizontal.



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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

Posted on Jun 13, 2007


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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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I don't know what you mean by "good". I've worked on this set several times for different problems. What do you need ?

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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.

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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.

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