Question about RCA F36650 36" TV

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F36650 No power, high squeal even without turning on.

My set made the infernal pop and then the picture went out, has the squeal even when not turned on. Did a vac out of dust.

There looks like a cap that is shrunken on the main board under the tube, haven't seen one like that before.

Any suggestions on the problem and fix and also does anyone know what pins to short to make sure all the power is out of this?

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  • 2 more comments 
  • CaptC Nov 28, 2007

    Rider - thanks for the info, I just ordered the flyback, need to find the HOT online.

    Can you tell me how to de-energize this? I want to live to see it work.


  • CaptC Nov 29, 2007

    Thank you, will have all the parts next week, lets see how we do!

  • CaptC Dec 03, 2007

    I put the HOT and flyback in and it powers up, get static sound, but no picture. Double checked the solder joints and looked around for anything obvious, but still blank. The part of the tube near the yoke lights up and the remote seems to work ok.

    Any suggestions? I feel like I am 90% there.

  • CaptC Dec 03, 2007

    Your the best - I was going to adjust the screen, but glad I didn't first.




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CaptC, those sets are infamous for that problem, you need to replace the following parts:
Flyback Transformer part # 257805
Horizontal output transistor part # 2SC5148
there is a coil off the base of the driver transistor I think it`s L4401 that should be removed from the set and scrape the wax off the legs then re-install and re-solder it and you should be good as new, good luck

Posted on Nov 28, 2007

  • Larry Eastman
    Larry Eastman Nov 29, 2007

    You can get a good quality HOT transistor here;

    1-800-575-9833 (no generic chinese crap), un-plug the set from the AC outlet for 1/2 hour, with set un-plugged you need to get a 1 foot long lead with alligator clips on both ends, attatch one clip to the shiny metal wire that goes around the picture tube (it`s a bare metal wire) thats the dag ground, attatch the other alligator clip to the metal shaft of a large plastic handle flat blade screwdriver and stick the blade of the screwdriver under the rubber cap where it attatches to the glass picture tube, this will discharge the tube and you can then remove the flyback.

  • Larry Eastman
    Larry Eastman Dec 03, 2007

    CaptC, hook up cable to the set and see if it talks to you, if it does have someone watch the screen for you, and mounted right on the flyback are 2 black plastic controls, one is marked focus & one is marked screen, using a small insulated handle philips screwdriver turn the one marked "screen" SLOWLY clockwise while someone watches the screen for you, when the picture comes up stop and look at it yourself, if it`s still a little dark go back & turn it a little at a time until you like the brightness then stop, if you go too far you will get "retrace lines all over the screen which means your overdriving the tube which is not a good thing, let me know how you make out, Larry



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A shorted horizontal output transistor or shorted flyback. If the flyback is shorted replace also its HOT.

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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.

Please rate this solution..............

Nov 12, 2007 | RCA F36650 36" TV

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