Question about RCA P52926 52" Rear Projection Television
I own a GE 31GT656 ( CTC169AS2 chassis) manufactured 1/1993.
Problem One: It exhibits geometric "bending" as the contrast level changes in the program material (even with the contrast turned down). I purchased a new flyback transformer in an attempt to correct this. I also wish to replace the "HORIZONTAL DEFLECTION CAPACITOR " while replacing the flyback. I can't locate or identify this part. Do you know the value / voltage rating / part # of this capacitor ?
Problem Two. I wish to replace the TWO "micro" green and red/blue "DRIVE" pots. Also the THREE red, green and blue "BIAS" pots. These are worn out (with "dead spots") and too course in their actions to provide sufficient accuracy in setting the grey scale. Do you know the value of these pots? I hope to substitute a "resistor string" for finer control and accuracy if I know the original values of these micro pots.
The three bias pots are 4500 ohms part # 190533 each are the same. The two drive pots are 100 ohms part # 190531 each are the same . On your other problems your headline states contrast blooming / breathing , this could be a sign of a weak picture tube or the screen control could be set too low . Now as far as the bending as the contrast changes , i would need more info . for example if the screen changes from a dark screen to a bright screen and the sides pull in suspect C4401 , C4402 or C4403 . Sometimes these tend to bulge at the sides . Now if C4402 is your problem also replace CR4402 . These would be the capictors in your horizontal section that give this chassis the most problems . Also a capictor in the power supply also is commonly bad in these sets . C4102 which is a 2.2mfd @ 100v . Now if your picture is not stable as far as the picture is full but everything slants alittle suspect the PIP module . Sometimes there are capacitors that are weak and won't let the picture stay stable . Hope i haven't confused you much but without seeing the picture its kind of hard to tell for sure . If you need any more info or part #'s let me know . TeamTech P.S. good luck in your repairs
Posted on Mar 06, 2009
If the picture is only bending in on the sides the problem is in the pincushion circuit. If it is the entire picture there is a voltage regulation problem either in the power supply circuit or the power supply off the flyback transformer which is usually a diode and capacitor combination. If you want to go with the odds, replace CR4118 with part number 164590. You may want to put the original flyback in as there are many problems with aftermarkets and even if it is an RCA part it is still aftermatket. As far as the bias pots a little cleaning spray usually does the trick. I wouldn't worry about trying to get a perfect grey scale out of a 16 year old tube, the original pots are plenty accurate.
Posted on Mar 06, 2009
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Posted on Jan 02, 2017
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