My RCS F38310 is out of fucus, bright and large picture with white lines running across the screen. Is anyone else having the same problem? What can be the problem? What needs to be done to repair the TV?
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Re: rca f38 310
This sounds like the Extremely High Tension (EHT or high voltage) is too high. This is supplied to the cathode-ray-tube via the sucker-like terminal clipped to the side of the CRT as in all conventional tube TV's
There is an adjuster but to set it correctly requires a voltmeter that goes up to 30,000 volts or more.
The chances are that the regulation of the power supply has gone wrong.
One other thing, not wanting to alarm you, if the EHT really is too high then the TV will be producing more X-ray emission but it will be a only be a small amount more.
The EHT needs setting properly to bring the emissions within acceptable limits not to mention making the tube last longer in this well-praised set.
Try not to use the TV as there is a possibility of eventual damage the tube or other components.
Please seek a professional repair service.
Although this reply is not a complete solution, I hope it will help you decide the way forward to get your set working impressively again.
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Vertical retrace lines is the problem. Thin white lines runs across the entire screen, at about an inch apart to each other. Check its video output supply voltage. Reduce the screen voltage to a little bit down and check. If you still wish to know more about this fault, check this site. Pull up older posts there.
Your vertical IC may have bad grounds. Resolder the pins on the vertical IC. You will also need to replace a capacitor or two that are located next or very near the vertical IC. I would guess you are concerned about a horizontal line that runs east to west across the screen. The info just mentioned will fix your problem. Give me a few hands and thanks for asking me!
you must open the back cover of tv, and then things you should do is set "SCREEN" adjustment on the flyback transformer. you must turn it counterclockwise to reduce and decrease the level of screen brightness. turn screen adjustment gradually until the horizontal blanking lines disappear from the screen. and blurred images will be sharp again
This RCA set uses the CTC187BD chassis. Look on the back of the set and to the right of the cable connector you will see 2 controls sticking out, one on top of the other. The top control is for focus and the bottom one is screen, or overall brightness. If these controls have been turned clockwise then you will have a bright, fuzzy picture with white lines (retrace lines) through it. Tune in a channel with white letters on the screen and turn the top (focus) control until the letters are crisp and sharp. Go into the menu and turn the contrast and brightness all the way down, and then turn the bottom control (screen) until you can just see the picture, just above the point where the picture is too dark to see. Go back into the menu and reset the contrast and brightness and the picture will be back to perfect.
It's always nice to have pictures when diagnosing a set over the internet.
I've seen this problem before. I found CR14710 burnt and the focus block arcing from the bottom of the control.
The capacitor and other components in the circuit should be replaced as well. They only cost a few cents and damage to them is a possibility.
Hope this helps.
Open up the back of the set but be very carefull. Notice a large black block with a large red wire that runs up to the picture tube. on one side of that large block where the thick red wire is comming out of are two controls, one should be marked focus or F and one should be marked screen or S. With the set operating normally and not touching anything else, slowly turn the control marked screen or S clockwish till the picture gets bright enough. If you go too bright the set will shut down or you see small thin white lines so back down on the control. then touch up the focus and your good to go. good Luck.