Last night when I turned on my TV I heard a loud click like a static shock. Right after that the screen was very bright and I couldn't see what's on, so I left the TV off for a while and turned it back on. The screen looked normal, but then 2 seconds later I heard a click (not as loud as the 1st time) and the white lines showed up then started to dim out. The screen is still bright, but watchable and there are dark lines when text is shown on the tv. Left it unplugged over night and I'm still having this problem.
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Re: White Lines and Bright Screen
I believe you have a shorted transistor on the crt board on the back of the picture tube which should be Q5104. Let me tell you my experience with these Zenith's The original problem is the picture tube shorting out and caused this problem. If you replace the transistor the same problem could arise again because of the tube and it could even knock out the main board power supply. I have seen this happen. And I have put in the transistor and no problem. You can get one at the Radio Shack by taking the bad one out and get them to cross reference it for you. All Zenith transistors have a prefix number (not on the transistor) which is 121- (with the dash!) and the number on the transistor The new one must go back in the way it came out! I recommend someone with electronic soldering and desoldering experience. Hope this helps
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Hi. It seems that the g2 voltage of the picture tube is too high, resulting in a white screen, often with white horizontal lines. The g2 (= second grid) voltage is derived from the flyback high voltage. The voltage divider is mostly integrated in the flyback trafo housing.(including the adjustment knobs). A failure in this divider may lead to this defect. The static you hear may come from sparking in the divider. The flyback trafo is soldered onto the main printed cirrcuit board. Sometimes, one of the pins sits loose in the soldering pads. Turn on the set and observe for any sparking around the entire flyback circuitry, and, or the flyback trafo itself The screen turns black after a while, as a too high beamcurrent is detected. The set disables the flyback. Stand-by blinks meaning that there is a fault condition. Be carefull with the high voltages. The flyback voltage is very high (20-30 Kilovolts !) and may be lethal !!
hello. it sound's like you have a picture tube that is shorting out from a something arking in side of your set.!!! eather on the (CTR PIN COUSHION).!!! OR ON THS CHASSIE.!!! THAT WHAT MAKING IT DO THAT.!!! TIME TO GET A NEW SET.!!! HOPE THIS HELP'S YOU.!!! "GOOD LUCK"
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.
YOUR tv DEVELOP a problem in the video ocillator or the tunner section have this set check by a qualified tech.to solve your problem good luck.any more contact email@example.com i hope by now you have gotten your set fixed the repairs will cost you about between $50.00.to $200.00 good luck.