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

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Random Blue Lines

I have much the same problem as another person did on this page. 1. When the T.V> is plugged in it come on automatically. 2. There are blue lines racing all over the screen (like x'sfrom one corner to the other) looks like the old Vsync. 3. No volume / menu / video select will change but still blue lines everywhere other than one setting. I have pulled out the power supply board and saw the 3300 uF capacitor mentioned in the other post but was not sure that it was bad / not leaking. not sure where the pico fuse is exactly as i have no diagram and not much exp working with TV's. I found that the power supply was available from for 69$ but wanted some opinions on this before i spend money i dont have to spend. Do you think replacing the power supply will fix this or have you ever seen this before? Thanks in advance. sorrowfull APEX T.V. owner...

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Re: Random Blue Lines

You should'nt replace anything untill you get a multimeter and measure the voltages on the Power supply PCB. Call Apex in your owners manual and see if they will supply a service manual so you know what the voltages are suppose to be. Or that manuel is avail as a download at for 15.00 bucks! Then you will get a better idea on what needs to be done , instead of shotgunning the repair. Good Luck

Posted on Aug 22, 2006

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Best Solution posted on Apr 12, 2008 Asker's Rating 3%20stars_w.png
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You have a completely different problem. The screen voltage for the blue picture tube is slightly too high on your set. This will put fine lines in the background of the picture, called retrace lines. This is very common and easy to correct. Remove the front speaker cover and the access panel behind it. Look inside and you will see a black box with six controls, each control having a little white glue on it. This is the Focus/Screen block. Three controls are labeled Focus and three are labeled Screen. The screen control in the center is for green but I am not sure if the screen control on the left or right is for blue for your model. With the TV on, set it to VIDEO 1 but do not connect anything to the VIDEO 1 jacks. This will produce a pure dark picture, showing any faint lines in the background. Choose one of the screen controls and increase (turn clockwise) it slightly. If the blue lines do not get brighter it means you are turning the red screen control, so put it back where it was and choose the other screen control. When you find the blue screen control, decrease (turn counter-clockwise) it until just when the blue lines are gone. If you want you can check that the red and green screen controls are set to just below the point where their faint lines are visible. When done, replace the panels and your picture will be back to perfect.
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MikeNJ1964 was exactly right! I have a Sony KP-65WV600 that had horizontal green lines that showed when the picture was darker. I had to remove 3 screws on the right and left side of the tv holding in the speakers...carefully pop out the middle panel from the clips holding it in....remove 4 screws from the cardboard in the middle and remove the cardboard. I then saw the six screws. The adjustment screws were the three below. I turned the middle screw until the lines dissapeared. I tried the left screw and blue lines appeared which I then adjusted away.
THANKS a bunch. SAVED me money!!!

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