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!
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.
- If you need clarification, ask it in the comment box above.
- Better answers use proper spelling and grammar.
- Provide details, support with references or personal experience.
Tell us some more! Your answer needs to include more details to help people.You can't post answers that contain an email address.Please enter a valid email address.The email address entered is already associated to an account.Login to postPlease use English characters only.
Tip: The max point reward for answering a question is 15.
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.
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.
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.
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.
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.
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.