Question about RCA RTD258 System

3 Answers

System won't power up

I need a new power supply circuit board. The one in the unit is fused at 3.5 amps and the board will blow that fuse instantly just plugging the unit in. I have unplugged all the connections(except power) to the board and the fuse still blows. I need a new board. The info on the board: rtd 258 smps bd mp, tm# 56104590. Made 2/17/06. No help from RCA. Any ideas? Thanks, Allen

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  • jusamaphonic Dec 01, 2008

    I have the same problem. Benimur, in answer to your questions, I have located two components that appear to be VDRs: One is mustard yellow in color and is labelled on the board as R1. The component itself has the following marking:



    The second is black in color, is labelled R117 on the board, and has the following marking on the component:

    NTC 5.0


    As for the ICs, there are five in total: Two 8 pin, three 4 pin. They are labelled as follows:

    IC101: (Eight pin)



    IC102: (Eight pin):



    IC103: (Four pin):



    IC104 and IC105 are identical to IC103.

    Since I'm a novice at electronics, would you have any advice as to how I would go about troubleshooting the suspect components you have listed? Much appreciated!


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Based on your description, we can limit the fault to the power supply board and in particular to possibly 3~4 components:

  • bridge diode;
  • filter capacitor (mains);
  • regulator;
  • filter capacitor (secondary).
blown fuse indicate a short in any of these.

As Jaime867 has suggested, in the absence of a readily available replacement board, component level might be the best alternative at the moment. Having posted the most likely culprits further narrows down your troubleshooting. Could you pls post back the part number of the smaller IC either 4 or 8 pins?

Alternately, pls check for the presence of a VDR, it would look like a coin (often green in color or something else) with 2 pins. They have been known to short out also and cause fuse to blow. One possible indicator is chipped or flaked of one side or a hairline crack on top. If it is chip, there would be a silvery color on the inside.

Hope this be of initial help/idea. Pls post back how things turned up or should you need additional information.

Good luck and kind regards.

Thank you for using FixYa.

Posted on Jul 26, 2008

I need a complete board for this system, I blew pluged in the wrong voltage, how can I get to purchase one?

Posted on Oct 22, 2008

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There seems to be a short-circuit in the rectifier or any other polarized component in the circuitry.
If you are able to fix the power supply yourself, it is worthy.
It appears that there are not service parts available for you device, the only way is to fix it to the component level.
Let me know if you need further assistance.

Posted on Jul 26, 2008

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