Question about RCA F36650 36" TV
My RCA F36650 started acting funny for the last few weeks. The picture would randomly go out, with a popping sound, and you'd see a bright spot on the tv before going black. Sound would still be present, and then all of a sudden just as randomly, the picture would come back on (again with the noise too).
Now the picture will not turn on at all, but there is sound. The tv powers up fine. Also, there seems to be no picture across any of the other inputs as well.
Thanks for the help.
Possible cause; since it did recover a few times, it may be the failure of solder on the main circuit board.
If you are adventurous and own a (good) soldering iron (NO GUN-they will damage too much) you could remove the board with a largish clump of plastic on it with a fat lead that connects directly to the CRT, inspect this clump (flyback transformer) from underneath and look (preferably with some kind of magnification) for cracked or missing solder, especially in and around the the ring of pins belonging to the flyback.
NOTE: If you decide to try this, DO THIS FIRST!
You will need some kind of flexible wire, perferably a clip-lead available from any store that carries anything like parts (Radio Shack for one) and a slim, insulated screwdriver.
- Clip one end of your lead to any component that has one connected to the largest, widest trace on the circuit board you can see - this will be 'ground.'
You may have to lift the board some to find this.
- Then clip the other end to the screwdriver, locate the other end of the fat wire from the flyback which connects to the picture tube (CRT) and slide the tip of the screwdriver under the rubber cap you see there.
Probe around and slightly lift that cap until you see some metal.
Make certain contact with that formed spring and then use the screwriver to carefully press the spring to one side until the cap can be lifted clear of the CRT.
Do this first, you may avoid getting the holy **** knocked out of you since CRTs can retain thousands of volts sometimes for days.
This voltage is not often fatal but it hurts like hell and can actually burn a hole through a finger if you try hard enough to be stupid; I've seen it done.
Whether you see any or not, using solder for electronic work (an alloy of tin and lead, normally with rosin core), reflow tha circle of pins.
Inspect your work - this is an area where hundreds of volts are present and you don't want any sloppiness in your soldering otherwise you negate your efforts.
When still doing this now rarely sought-after kind of work, I used an old toothbrush or a shortened 'acid brush' and alcohol to scrub the flux (rosin) loose and then with a sturdy paper towel, brushed over that to absorb the mixed rosin and alcohol.
In closing, there are other components that may retain charge located on that board so in your case, I would pull the plug from the wall and ignore the project for 24 hours to give those a chance to 'bleed off' any charge they might have.
(Hmmm, would I do this if I hadn't done it before? Well, yeah , , ,)
Posted on Jul 10, 2008
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Posted on Jan 02, 2017
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