RCA P52753AT Big Screen TV Power Supply...

I got a big screen tv from a family member. They said that it would work but it would lose color and go to black and white sometimes. I plugged it in when i got it home and the power light came on and blinked a couple of times, then went out. I then tried it again and the same thing happened. It done this about 5 times before it stopped and i smelled that familiar electronic burning smell.

I opened the back up and could see that a resistor was burnt on the right side board, but that can't be the main problem. I can hear a clicking sound on the power supply board when i plug the power cable in. It only happens for a few seconds and then quits until i unplug the power cord, wait a minute or so, and plug it back in. Is this a rely clicking like that?

Please help. I would like to get this going.

Thanks Jason

Reply to
jsandlin
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Probably the SMPS cycling against a short.

Reply to
Homer J Simpson

Is there a part number that i can look for? What does the SMPS look like?

THanks Jason

Homer J Simps>

Reply to
jsandlin

If it's a short replacing the SMPS won't help.

Reply to
Homer J Simpson

SMPS stands for switch-mode power supply. It's not a component or board, it's a series of components on the main pcb. TV's contain protection circuits which detect incorrect current and/or voltage situations at various points in the TV circuitry. What's likely happening is:

  1. You turn the TV on
  2. The logic portion of the TV (low voltage) closes the main AC relay which powers up the flyback and rest of the circuits (high voltage).
  3. One of the protection devices senses an out-of-spec condition and sends a message back to the microprocess.
  4. The multiprocessor shuts down the set.

Truly I mean no offense here, but the likelihood of your being able to fix this set yourself with the skill level you exhibit in your postings is incredibly small.

SMPS power supplies and the HV portion of your TV set have voltages that can kill you (think 30,000V). There are charges built up in various capacitive components which can hurt you badly even if the set is not plugged in.

Take it to a qualified repair shop.

Just my 2 cents.

Dave

Reply to
Dave

Ohhhhhhhhhhhh this is a common problem on that vintage tv, Those in the know will know what I mean you have a convergance amp failure proberbly several of the con amp tranistor on the con amp board are shorted, burn't a couple of resistors.. this is what is shutting down your set. take it from the pros like us and take it to a good shop. the light box come right of that set just bring that , and be prepared to shovel out some large somes of cash projo's are not cheap to fix

Reply to
David Naylor

I have the same unit. Mine was the main power supply (SMPS) with a blown HOT (horizontal output transistor,) shorted HV Splitter (the thing behind in the front panel that has all the big red wires going to it,) and some bad caps in the SMPS that were causing the voltage to ride too high in the first place.

I bought the repair kit from

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and got it going. Unfortunately, I messed up the convergence and it is a real pain to readjust and I gave up on it for a while. I'm spoiled by the newer sets where you do it from the remote in service mode.

Sounds like you have other problems to boot and I don't know about those factors. You can buy a service manual and try and track the problem down but the time may not be worth it.

Good Luck

jsandl> I got a big screen tv from a family member. They said that it would

Reply to
tem00

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