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

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Apex model GB4308 Vertical Deflection failure

Hello All,


First this unit came into the shop with failed vertical deflection.


R370 and R371 was bad as well as TDA 8351. there was a post to replace c-863.


That is my problem I can not find C-863.


Does anyone know the location on theborad for this Cap? I have searched the C-800 area and others on the board. I am obviously overlooking it.





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Re: Apex model GB4308 Vertical Deflection failure

Sears used to sell these TVs, therefore they are likely to have parts, check with them.

Posted on Dec 14, 2007

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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

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