Bottom of screen flickers, and eventually the screen 'freezes'
Prima flat screen, wall mounted TV. I get horizontal waves (and I don't mean wavy lines, but rather pulses, I guess) at the bottom of the screen. If I leave the TV on while this is going on, the entire screen will eventually freeze with vertical lines of black and color. It first happened while I was watching something I had PVR'd, but realized that it happens on TV too (HD or otherwise). I made sure all the connections were good and solid, checked some settings...all seems right. Had good viewing for 2 days, and now it is back to the waves and freezing...am I hooped?
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There are two problems occurs on your TV, one is the line down the screen because of faulty horizontal deflection or faulty horizontal yoke winding. 2nd is...color of the screen are not balanced, check the RGB transistors in CRT board circuit.
It sounds that the main power supply section to your TV has the fault. The horizontal thik lines that appears crawling down across the screen should be of video 'HUM'. Have you replaced the main filter capacitor at the power supply section? If not, replace it along with the main rectifier. The AC power is rectifed by a bridge and applied ot this main filter capcitor. It will have a capacitance value between 120 to 350MFD 450VDC. Check this section. Measure the rectifed DC voltage acorss this main filter capacitor. It should be around 350VDC, if your home power supply line is 220VAC. If it is 110AC, this DC voltage will be around 165VDC; and it should be. If rectified DC voltage found lower than the input AC voltage, replace the rectifier bridge. In some sets, this bridge section have four diodes. Some other circuits, a bridge rectifier stalk may be used.
Make a fist with ur hand and bang on the tv bazel frame.The tv picture flickers back or bounces back to a normal picture.The tv have a vertical or a horizontal hold ics have coldsoldering joints and requiring resoldering.If u bang on the tv bazel frame picture don't flickers back or bounces back to a normal picture.The tv have a vertical or a horizontal hold ics are dead require changes those ics chips.If u don't have all the tools.Can't do a basic soldering work or able to changes those ics chips.Shop around for tv shops for estamate and repairing prices for repairing.
The convergance or y-sus board can become faulty. The capcitors do tend to burn out. It is about a $250 + repair for this. Not all parts can be repaired, but they can be replaced. A capacitor tester and multi-meter are about the best tools for the job. If the price you get is over $250, I simply would replace it instead of repairing it..
Your vertical IC needs to be resoldered and change the capacitors in that immediate area. Always check for bad grounds [cracked rings around the pins, look real close to find] on any and all ICS mounted on heatsinks. And large resistors as well.
hi there, your set has a capacitor problem, most of it are on the horizontal section and video section., usually 100 microfarad electrolytic capacitor with a high voltage is damage. try to test some parts. ty