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

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Apex gb4308 flashing blue screen and cycling channels

My newly acquired gb4308 is flashing a blue screen and appears to be cycling thru the channels one at a time with every flash. Only the blue projector is lighting up, but when I unplug the wire going into the verticaly oriented, metal enclosed board on the A/V (I think) board all 3 projectors light up and the cycling stops. No video or audio. Any ideas would be appreciated!! Thanks Ridler

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

Posted on Feb 18, 2008


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No picture

Let your local TV repairman check it. Don't touch anything inside it nor open it.

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Tv will turn on but nothing shows up

here is a simple test to know whether to call a technician,...first, check all connection including the antenna or cable lines to your unit.if not, tap the unit for 2 to 4 times.while tapping watch what happens to the picture.if the unit turn on or becomes okay, i suggest to call a needs resoldering or something inside has loosed contact.

May 11, 2009 | Apex Digital GB4308 43" Rear Projection...

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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...

1 Answer


this could be a flyback problem a cheap part but the labor may be as much as $600.00 the problem will get worse untill your whole screen turns blue

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

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it sounds like your lenes need cleaned and alined

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

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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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'I to am getting only wavy blue lines, no sound, doesn't even show channel indicators. TV was off for 4 days, came home turned it on and ten minutes later this screen appeared, it wont even show the menu screen, different channels or video inputs no sound either.

Jun 21, 2008 | Apex Digital GB5108 51" Rear Projection...

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TV has no vision , only one channel has sound

your tv is locked!
If you have a blank screen with a red key on the bottom left, simply press the (function or F) button and the mute button at the same time. This will unlock the screen and allow you to view the channel as desired. • If your TV asks for a 4-digit code or password please enter 3308 or 6688 to unlock the screen or reset any preset rating levels. • If you have a GT2011J or GT2011S Television, hold the (Display) button for 10 seconds, it will unlock the screen. If password or code is requested, try 3308 or 6688.

Dec 21, 2007 | Apex Digital GB4308 43" Rear Projection...

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Apex 32" TV - Blue Screen & Channels keeping running/changing

blue screen indicares that there is a problem in blue cathode circuit. please check 1 blue video output supply. 2 blue video ckt defective 3 signal from chroma ic to blue cathode missing. 4 loose connector 5 crt base loose. 6 chroma ic defective. I think sound will be ok .

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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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