I just recently had my flyback transformer, and horizontal output transistor replaced on my 36" RCA (F36650). Now i have two thin red lines in the upper left/center of the screen running diagonally up from left to right. The picture and sound are great. It's just the lines you can sometimes see depending on the background picture. Wondering if it's a screen adjustment or something the guy that fixed it for me did. Thanks.
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Re: Thin Red Lines on Top of Screen
Sorry, that is common for generic replacement xformers for
your make / model . There are some adjustments to minimize
the effect in servicer menu...............you can try turning down the
screen control a bit....................T.
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You've lost the horizontal deflection circuit. Most likely the horizontal output transistor and high voltage
(flyback) transformer. When this happens this power supply tries to start but shuts down because the Horizontal output transistotr is shorted.
The HOT Hortz output transistor has gone home, 99% of the time from a faulty IVHT (Flyback Transformer), very common on the ctc187cl* chassis. The factory Flyback is no longer available, I have had problems finding an aftermarket one to replace it with.
The HOT is a BUH517, but you can also use a 2SD5129. It is the transistor mounted on the siler heat sink with a metal clip rather than a screw, just in front of the flyback.....
If you replace just the HOT, most of the time you will get a rapid arc (27,000volts - BE CAREFUL!!!) from the lower (yoke) post on the flyback. If the flyback is shorted, It may also just burn out the HOT and go right back to "squealing"....
Usually the horizontal output does become shorted when the flyback goes. I would replace the H output as it only cost around 3 dollars. You can check it with an ohms meter out of circuit to determine if it is indeed shorted or open.
Confirm service # from back of set = F36650 YX01.......... Transformer red HV lead attaches to CRT & Horiz output xistor is on heatsink next to transformer = 2SC5148 ......... Rca part # 257805 or ASTI 2078 and 237470 xistor............ Do not use a generic transistor = name brand only............T.