Question about RCA BLC524 5.6 in. Television

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Dead looking to identify U4 on power supply board. Mine is smoked. I can see 358 on it, that's about it. RCA or IC number would be great. Or the whole board if someone has a scrapped one. Thank you (one of the high speed switching diodes on this board was also shorted)

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Re: dead

I called RCA today and they identify this part as IC 502 and the part number they gave me is 244662-U4(stock number),the phone number you need to call for parts is 1-800-338-0376,in this number they should give you price and availabity.I hope you can relate to the information.

Posted on Oct 13, 2006

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Once i opened my beac tv, it automatically turn to standby mode. there is a red light indicator. what seems to be the problem?


Your power supply board is dead, u know basic electronics' and soldering? Most of the times, the power supply board just have dead leakages gases capacitors.These capacitors always bulges up on it top,or puff up on it top.Replaced these gases leakages capacitors will get your TV power stable,and work again.Or tries websites like, to buy a whole refurbish power supply board for the replacement.

I hope this will help to solve the problem...

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No power or anything

So I had nearly the same thing, only no intermittent behavior - just alive one day, dead the next.

I took my unit to an electronics repair place. For $25 they diagnosed AC power supply failure and offered to charge me a total of $110 to refurbish the machine.

I balked since we paid far less for the unit on Ebay ($70 or so).

The store gave me the parts list for the estimate though - and I bought the parts and did the work myself. Total another $25 approx, plus time. If you are up for some small electrical work, get a soldering iron, some electrical solder and a soldering wick. You will need, some wire cutters / strippers, and a screw driver too. you may also want a Dremel tool with a cutoff wheel.

Anyway, just replace the first 4 diodes after the transformer leads to the main board and replace the transformer.

The diodes can be from any of a number of manufacturers - mine are Vishay part number 1N5408 - 0827J. The critical part of this part number is the first 6 characters. Put the diodes in using the orientation guide printed on the main circuit board (otherwise risk putting them in backwards).

The transformer part was a Stancor, part number P-8657 - it converts standard wall AC (117V at 50 or 60 Hz) to AC at 12V, 2A. This part is BIGGER than the OEM Hang Fung transformer. I used a Dremel tool and cut out the mounting pieces for the OEM transformer from the main housing. This made enough space to fit the new transformer. Now the new transformer is held in place by clamping action of the two-piece main housing when the screws are installed. I DO NOT KNOW IF THIS IS SAFE, SO YOU ARE WARNED!!!

Unit works fine now. Mouser electronics has the parts and will ship USPS in a few days.

Thanks to VY Electronics, Rochester, MN for diagnostic work.

Dec 14, 2008 | GPX KCL8806DT 7 in. Portable Television

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Schematic/manual needed for RCA 27V412T Color Television repair

Look for the vertical IC. It should be a small flat IC attached to a heatsink and marked something like LA7837. The IC will have a circuit designation like ICxxx. For example IC301. Check all of the caps in the same circuit (C3xx). One or more are bad &/or intermittant. Start there and keep us posted.

Apr 28, 2008 | Portable Televisions

1 Answer

Unit is dead....

The power supply is the first place to start.

Is there a transformer? Check to see that there is AC on the primary & secondary of the transformer.

If no AC on the secondary, then the transformer is bad. If AC ok on the secondary, then look for a bad rectifier diode/module and/or regulator module. There might also be fuses on the DC side of the power supply.

If the unit is completely dead, it's most likely a power supply issue.

Please let me know if I can be of further assistance to you.

Good luck!

- Jim

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