RCA M50wh72s
Hello; I am John at J D Electronics in Poland Maine. I have had an RCA model M50WH72S setting dead in my shop for over a year now and is now mine. The set would start intermittently and run for an hour and die. Other times it would not start at all and the LED would flash 5 or 6 times and stop. With no support from Thomson/ RCA, I was on my own. The extended warranty Co said to try the light engine first. I replaced the light engine with no improvement, just the led flashing. I was not going to pay 500 to 700 dollars for other boards to try to fix this piece of JUNK.I have since read several blogs that point to power supply caps as being the problem. I took this piece of junk apart for the last time before I hauled it to the dump. I pulled out the power supply on the left as you face the back of set. I noticed 2 Electrolytic caps had " domed shaped tops ,which is a good sign of failure or overheating. They are 1000 ufd @ 35Volts 105 degree rating. They were both bad along with 2 more on the same board ! They are labeled CP624 and CP647 on the bottom edge of the board inside the "c" shaped heat sink. The other two are above the chopper transformer labeled CP641 @ CP639. replacing these fixed the set. Call DigiKey 800-344-4539 part # 493-1588 are ten for $7.00. Don't spend money on a lamp you don't need.
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Re: RCA M50wh72s
Welcome! Glad you fixed it.
What were the brand(s) of the caps that failed?
If you do some reading through these forums, you'll see the prevailing method is to recap the entire board of any that are of the "vent" type. Especially those that are known crap brands.
Do you have an ESR meter for your business? If not, you may want to invest in one as it will help finding and solving problems that elude many shops.
Cheers!
Toastveritas odium parit -
Re: RCA M50wh72s
Hi; The caps are Nichicon. Probly not so good . I only use a digital meter that tell capacitance and not ESR. The worst out of the 4 was completely open. Johnny
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Re: RCA M50wh72s
RCA chose to use general purpose specification of this Nichicon.
Cheers, WizardComment
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