bugg
Novice
Mar 13, 2008, 10:02 PM
Post #16 of 17
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Re: [runaway] RCA PROJECTION TV SHORTING OUT(PICS)
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If you follow those 3 projection lenses down inside the cabinet you'll find three CRTs. (Cathode Ray Tubes)... That is how it is a tube-type television. Not Direct View, but still tube-type.
Regardless, Just thought I'd add my 2 cents worth here.
The safest option would be to take the television to a qualified repair center, but you aren't going to that, now are you?
If you are not qualified to work on potentially lethal electronics, do NOT continue reading this... I take no responsibility for you breaking your TV, burning your house down, electrocuting yourself, or ANYTHING else negative which may result from this OPINION.
With that said:
Your television is an ITC222 chassis, this is a common repair. I worked on one this week actually. It is very possible you can repair your television with no parts whatsoever. (Well, some solder)
Here is what I PERSONALLY would do if I were working on this set:
I realize the burn on your PCB looks quite serious, but it's not as bad as you might think. In fact, the capacitor is PROBABLY (9 out of 10) not bad at all, and the burn is PROBABLY the result of a poor solder. You wouldn't BELIEVE the number of bad solders I've repaired on that capacitor.
1) Discharge any filter capacitors on the board!!
The AC input board on this set stores around 300VDC, even after the set has been LONG unplugged.
2) Completely (carfefully) unsolder and remove the capacitor.
3) Scrape away as much of the charred PCB as possible WITHOUT disturbing the foil (NOTE: It is EXTREMELY important that the neighboring foils are not disturbed) I use a dental tool for this task.
4) Examine the capacitor, (test it a fluke if possible), It is probably not bad, clean any residue from the pins.
5) Reinstall the capacitor (polarity doesn't matter)
6) Put the board back in the TV and see if it works.
That is a HV capacitor, (X-ray Critical) so do not attempt to power the set up without it installed or else
you risk shorting your Horizontal Output Transistor (or worse).
If the set still does not come on you either have further trouble (suspect flyback transformer) or the capacitor is in fact defective. (now you can fork over the $1.50, and hey, you already got some solder!)
I have NEVER had to replace the capacitor unless it was physically burned, and judging from your pictures most of the damage was on the BOTTOM of the PCB.
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