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

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Apex gb4308 multi colored horizontal bow in middle or screen.

Ok, heres the problem. my apex gb4308 has a multi colored horizontal bow in the middle of a black screen. You can almost make out an image in this tiny 3 inch bowtie shaped band crossing the screen. sound works great. Also I have already replaced the Convergence board ( waste of money ) it didn't help the problem but oh well. I have been told that the STK's are the next suspect. I'm looking for thoughts and sugestions on this annoying problem. Thanks

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Re: apex gb4308 multi colored horizontal bow in middle or...

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.

Posted on Feb 17, 2008

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There is a bow in the picture top and bottom of screen

The tv have a problems known as a convergence problems,it is dead.Tv have colors R,G,B lines mis alignments,have shadows pictures or 3D picture look alike?Yes the tv convergence board have dead 2 STK convergence ICS and some or all of it resistors too.These parts,must be replace on the tv convergence board to solved the tv convergence picture problems.The shop will cost u like $300-350 for parts and labors.

Jun 09, 2011 | 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


Feb 18, 2008 | Apex Digital GB4308 43" Rear Projection...

1 Answer

There is a red outline that seems to slide and the picture bows

Projection sets have two very common problems.

The first common problem is convergence

These sets need to have all three colors - RED - BLUE - GREEN - lined up correctly on the screen in order for the picture to look normal. This is called convergence.

When its out of alignment the video will look 3-D, wavy, distorted, etc. Most of the time you just need to adjust your convergence in the menu. If you cannot adjust it in the menu - then your convergence is broken and needs to be repaired. Convergence problems are very common on all Projection TV sets including Sony, Samsung,JVC,Philip Magnavox,Panasonic,Akai,Pioneer, Hitachi,Mitsubishi,Zenith and others.
You can get more information and a DIY convergenece repair kit with instructions from the link below.

Here are some of the most common problems with these sets...

*Screen Looks 3-D
*Colors wont align
*Screen may look distorted or warped
*No Audio/Video - TV Shuts down - May also make a constant chirping sound

Problem #2 - Another common problem is dull or washed out video.

Your set may have one or more of the following symptoms....

*Dull looking picture
*White looking picture
*Halos around objects
*Red/Orange looking picture

bb0cf99.pngYou can see some more examples and find a fix using this link on Fixya

May 28, 2010 | Apex Digital GB4308 43" Rear Projection...

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Cant get right color and see wavy lines

This is a common problem. Its called a convergence failure.

Problem #1) Convergence


  • Screen Looks 3D
  • Colors wont align
  • Video may look distorted

You can see some examples and find a fix here...

Jan 10, 2010 | Apex Digital GB4308 43" Rear Projection...

1 Answer

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

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

Jan 14, 2009 | Apex Digital GB4308 43" Rear Projection...

2 Answers

Problem with tv APEX DIGITAL GB4308

it sounds like your lenes need cleaned and alined

Dec 08, 2008 | Apex Digital GB4308 43" Rear Projection...

1 Answer


it very well could be a flyback ! a cheap part but hard to find for your brand!

Sep 23, 2008 | Apex Digital GB4308 43" Rear Projection...

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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.

Nov 06, 2007 | Apex Digital GB4308 43" Rear Projection...

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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

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

1 Answer

Apex gb4308 flashing blue screen and cycling channels

Sounds like a power supply problem to me. Could be caused by the actual supply, or could be a component failure elswhere...accordianman

Nov 04, 2006 | Apex Digital GB4308 43" Rear Projection...

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