Apex Digital GB5108 51" Rear Projection EDTV-Ready Television Logo

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Question about Apex Digital GB5108 51" Rear Projection EDTV-Ready Television

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Three colored lines across the middle...

I have a Apex GB5108 that has nothing but the three colored lines across the middle of the screen. The set does not have sound and the control buttons dont work (except the menu). I'm no expert but it seems like it must be a power supply problem? Any advice would be greatly appreciated!

Posted by Randy Terry on

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Anonymous

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Sounds like the vertical control IC has gone out. Replace IC N301 (TDA8351) and check or replace R370 (1ohm), R371(33ohm), and R380(1ohm). This shouldn't affect the sound but once you get video you might figure out what is wrong with the sound (control setting). The TDA8351 crosses to NTE7156 and shouldn't run you more than $10.

Posted on Sep 30, 2007

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4helpful
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Hello, I have an Apex GB5108 and it has a horizontal colored line going through the middle. What component could be bad and needing replacing? Thanks Tom

I am not familiar with this particular set, but it sounds like you have no vertical deflection, which would mean your vertical output IC may be bad. The # on those ICs usually start with LA and is mounted to a heatsink.
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Picture reduces to about 2 in across middle of screen

Probably theelectrolytic caps around the vertical are failing or there are some bad solder joints in that are. See if tapping around the area restores the pic, if so resolder until it is better.
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Convergence IC's

Lines going across is a little vague but there is always the problem with the electrolytics (caps) around the vertical, be sure and get the one on the power supply too. Just change all you can find(usually 4-5). Thre are 2 convergence ic's if you didn't change them both, resolder the other one.
Then check the value on R519 for me.
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Colored lines in middle screen , from side to side

Not much of a description but it may be a convergence problem, these sets had lousy soldering on the convergence chips, un fortunately, if it goes long enough it will require chips and in my case , a resistor I cannot read the value of.
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51 big screen apex tv, convergence or verticle IC?

If the lines are thin and close together running horizontally, it may be the vertical driver, but that usually takes out the resistor and sometimes the diode in the B+ for the vert. Also you must replace the caps that caused the problem in the first place.
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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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I have worked on projection displays for about 17 years 20years electronic. and this sounds like a vertical deflection amplifier problem. this is if the lines or the rainbow you said that you see are horizantal.
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Apex GB5108 Convergence and screen issues

TWO INLINE FUSES ON THE POWER SUPPLIE BOARD, ALSO THERE TWO CAP [email protected] AND A [email protected] THESE WILL LEAK UNDER STRESS. JOHN PATE WITH JOHN'S QUICK REPAIR.
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APEX TV problems

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