Sony kv32v15, Red screen with fine horizantal lines then shuts off
My Sony kv32v15, suddenly shut down. When i tried to power it up again, it gives me picture for a few seconds then changes to a red screen with fine horizantal lines then shuts off. any help about what to change or where to look for thgis problem will be appreciated, thank you!!!
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Re: Sony kv32v15, Red screen with fine horizantal lines...
I would suggest to measure the 200 volt B+ at the CRT socket. If that voltage is found to be low, disconnect the socket from the CRT and measure again. If the voltage reading returns to normal you may have a defective CTR.
Also check for open or defective diode on flyback transformer for the 200 vdc source.
I would also suggest to take all the necessary precautions since you are working in a very high voltage area.
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There is a large sand filled resistor on the main board close to where the power cord attaches that cracks. This will stop power until it cools enough to make the connection then heats up rapidly to open it again. It may be worth the trouble if you're handy with a soldering gun and can get the back off the TV. If not then I'd consider getting a flat screen.
Seems like your RED CRT is shorting out or failing. Do you notice any other colors besides just red having problems? The blinking of the red light eight times is a High voltage error. It could be your D board but I'm thinking it is more likely the red crt is probably shorting out.
The adjsutment that you turned down was the G2 voltage to the red tube which is just a temporary fix for a CRT which has a short developing in it. Try turning up the red adjustment again only slightly to see if the red CRT ( tube) will light up
if it does and then the set shuts down its most likely the red CRT which is bad . If it lights up but you get retrace lines but doesnt shut down it possible that its the CR board ( Red CRT Drive Board) which is at the very bottom of the red tube.
Can be 1 of 2 things. 1st the red tube just needs the voltage to it turned down. In the front of TV (you have to remove the lower front half of TV to access it) is a plastic square with 6 knobs. The from left to right top knobs control focus for blue,green red. The bottom knobs control voltage to each tube in same order (so lower right knob for red) turn SLOWLY to left to reduce voltage until excessive red and lines go away. If you over turn left or right set will turn off. If that does not fix it or if lines reappear then option 2 is that red picture tube is failing outright and needs replacement.
Sony sets have internal diagnostics. Unless the ste is 100% dead, you should see the standby light blink in a pattern of count,pause,count... Please supply that count here and I can give you details about the problem.
does the led flash when you try to power it up? If so let me know the number of flashes. From your description I would suggest 1 of 2 things happened. (1) The Convergence amp ICs have shorted and blown the 5 amp fuse on the G board, or (2) the red CRT has shorted shutting the set down. Check the fuse and if blown replace the fuse and disconnect the Red CRT PC board from the RED CRT and try powering up the set. If it powers up without shutting down then unplug the set and rehook the RED crt pc board and try again if it shuts down the reds shorted. But if it still wont start with the CRT unhooked or blows the fuse Change the Convergence ICs
If the picture is playing fine and you notice that the background is getting more and more red, until it is too red and the set shuts down, it could be that the red screen control is set just a bit too high. If this is the case, you can probably correct this yourself. If you are watching a perfect picture and then it suddenly flashes a very bright red, with thin red lines in the pictureand then shuts down, it usually means that the red picture tube has developed a short in it, between the cathode and heater. A good tech might be able to remove the short by arcing, but if the short persists then the red tube will have to be replaced. Either way, this is something that should only be done by a qualified tech.