After a recent brownout( low line voltage) we have had problems with our tv not turning on. Sometimes it stays on for a few minutes. Other times it stays on several hours. I need suggestions on finding and replacing the bad part probably in the power supply.
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your problem is intermittent if you are not a tech have some one repair your tv the problem could be in your power supply,or horizontal circuit where the high voltage is.it can also be your micro processor. good luck.
If you have intermittent line horizontally across both tv screens then there is likely to be bad solder connections on the vertical ic's of both of them. This can be fixed by taking the back off with quarter inch nut driver and carefully sliding the chassis out and turning it up to see the solder side. I don't know the location numbers but the vertical ic will be mounted on a metal heat sink and the connections will be in a row. Sometimes you can see the bad connections. You may need a magnifying glass. I recommend someone who has experience soldering electronic circuits. No solder bridges etc. This is for intermittent (works sometimes) problem on vertical ic. If the line stays then the chip ic is bad along with a 1 ohm resistor off the flyback high voltage transformer. From what you described you likely have bad connections. Hope this helps
Try checking the filter in the 116v line. You may have an intermittent spike coming through the B+ line.(The filter may have decreased in value)
Also a small filter in the X-ray circuit could have lost capacitance.
There is a low value capacitor (about .047uf @400v) in the collector circuit of the horizontal output transistor that will detune the horizontal circuit causing the HV to go too high. If this cap is intermittent it may be causing your problem.
Hope this helps