Question about RCA P46921 46" Rear Projection Television

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I hear a sound like a shortcircuit on backside?

Thanks for the answer, yes i have low experience in TV reparation but i dont have the schematics for this TV, if you could send me this to my mail (eduquiros@yahoo.es) or post the link it could be helpfull to solve my problem! And yes i hear a clicking sound. I can power on my TV sometimes and it work regular (clicking sound periodly), but sometimes when i turn on my TV, i hear two or more clicking sound and the TV turn off inmediattly! I am scare because an repair person on my country said that the problem is the ctr´s and want arround $1000 for repair it. I dont thing that the problem are the ctr´s.

Thanks for the help!

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  • twbusi Aug 03, 2008

    i turn on the tv and get no picture. it clicks about three times like its going to come on but nothing happens

  • kchapman907 Oct 04, 2008

    I have static sound coming from 1 speaker and no sound coming from the other. How hard is it to change the speakers and is this more than likely the issue?

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I think the problem is either the power supply/High Voltage board or the IHVT (Integrated High Voltage Transformer). I don't have schematics for this model, in addition you will need to take the IHVT out and perform a ring test on it, also I would advise you to check and see if the Horizontal Output transistor is shorted also, you can do this with an ohmmeter (measure between the collector and ground it should have a high reading if the reading is low the transistor is bad). The ring test can be performed with the use of a Universal Video Analyzer, or a LCR analyzer.

I hope this helps,

Thank you,

Shuttle83

Posted on Jul 19, 2008

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I hear a sound like a shortcircuit on backside?


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

Jul 15, 2008 | RCA P46921 46" Rear Projection Television

1 Answer

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