Question about RCA P46921 46" Rear Projection Television

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I hear a sound like a shortcircuit on backside?

Hi i am from Costa Rica and have a TV problem. I have an RCA P64730wk chasis PTK169PCA, my TV has to many problems. First: i hear a sound like a shortcircuit on backside, when i open that i see blink the center of the three ctr, i dont know if the problem is one of the ctr or the problem is the HV splitter? Second: i see a blurry image and little blue shadow on the green numbers and colors red are blurry. And finally i have convergence problems on both sides. Please i need help because all people tell me that the problem are the ctr´s but i dont think so

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Hello eduquiros,

First of all I think you are hearing a clicking sound right? That noise is due to the HV shutdown circuit activating, indicating that excessive current is being drawn. Now the fact that the TV is on is indicating that the current level is right at the point of shutdown, now I would like to know if you have the schematics for this TV? If so locate the input to the HV trippler and measure the voltage with a HV probe, and compare it to the value on the schematic. In addition you say you have a convergence problem, for that I would say you have to change out your convergence amplifier modules.

Now let's get the the over all issue here: Do you have electronics experience? if so you will need a HV probe, a multimeter, and a pattern generator to solve this problem. If you have these pieces of equipment great, if not you will have to get them. If you do not know what these pieces of equipment are, close the TV up and have a TV repair person come and give you an estimate on the repair costs.

If this were in my shop I would triage the issues you are having,

First find that sound you are hearing (the exact location) and determine if it is a clicking noise or a burning noise (arcing).

Second repair that convergence problem, compare the voltage readings with the schematic

Third repair the HV issue

This should leave you with a working TV.

REMEMBER if you do not have electronics experience, have a TV technician take a look at this set.

I hope this helps

Thank you,

Shuttle83

Posted on Jul 17, 2008

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