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

Posted by on

  • 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:



    TVR

    10221



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



    NTC 5.0

    0630



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



    IC101: (Eight pin)

    DMO265R

    BG30



    IC102: (Eight pin):

    FAN7554

    VG38



    IC103: (Four pin):

    BC627

    EL817



    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!

×

3 Answers

  • Level 3:

    An expert who has achieved level 3 by getting 1000 points

    All-Star:

    An expert that got 10 achievements.

    MVP:

    An expert that got 5 achievements.

    Brigadier General:

    An expert that has over 10,000 points.

  • Master
  • 6,966 Answers

Hi,

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

  • Level 3:

    An expert who has achieved level 3 by getting 1000 points

    All-Star:

    An expert that got 10 achievements.

    MVP:

    An expert that got 5 achievements.

    President:

    An expert whose answer got voted for 500 times.

  • Master
  • 2,267 Answers

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

Add Your Answer

Uploading: 0%

my-video-file.mp4

Complete. Click "Add" to insert your video. Add

×

Loading...
Loading...

Related Questions:

1 Answer

My Coby Home Theater System will not turn back on.


I am not sure about your unit specifically but - most units have a fuse in the circuit board that blows and it is in the power section. Maybe this is the problem since you have done everything else that I would have done first. Unplug the unit and take off the back panel. look for a fuse in the circuit board. DON'T be sticking your fingers in there until you see the small fuse. Use an OHM meter to see if it is good or not remove it if it is bad. Radio Shack has fuses for about 4.00. I hope this helps

Feb 23, 2014 | Coby DVD938 Theater System

1 Answer

Behringer epa300 the fuse keeps blowing at the back of the amp


the power supply uses 2 x mosfet spa11n80 they are burnt out replace them. unit start at 80 volts ac use veriac if you have one

Sep 15, 2012 | Behringer Europort Epa300 300w 6-channel...

1 Answer

BLOWING FUSES INSIDE UNIT. REPLACE FUSE. BLOWS INSTANTLY


hello because theres a dead short and the fuse is doing it's job could be number of thing that are wrong. 1 shorted diodes/ 2 shorted output transistor/ 3 shorted resistors /4 blown or swelled capacitors get an engineer to check it out good luck

regards
shaun

Dec 27, 2010 | JVC TH-A10 System

1 Answer

Power amp for pa system stopped working


Sounds like you have a power supply problem in the amp. I am assuming the fuse you are replacing is intergraterd into the AC connection. You need to dig deeper. If you are not an electronics person you will need a tech.

Jul 02, 2010 | Phonic Power Pack 620 PA Package B-Stock...

2 Answers

The unit won't power on at all.


You can try replacing it with any 10 amp fuse just to see what happens. If a new fuse keeps blowing out then you have a shorted power amplifier inside(they consist of transistor or a single chip). These device look normal most of the time short out with any visual indication. If you desolder the power amp chips(they are mounted against an aluminum heat sink to dissipate heat) and the fuse quit blowing then it is the problem.

Aug 11, 2009 | Samsung HT-TX72 Theater System

1 Answer

No Power on rt2580


According the parts list on the model unit your fuse is suppose to be F101,FUSE 6A 125V. Is it possible that you have an undersized fuse?

I don't believe that one amp differents would cause your unit to blow like that but, you never know. More than likely you have a bad component in the power supply or power amp.

Then again, with an average replacement cost of $150 online; it not worth getting too deep into the repairs.

Jan 29, 2009 | RCA RT2500 System

1 Answer

Won't power up.


I have a TH-C30. I had the same problem where the unit just stopped working - no standby light and no recognition of power at all. After checking this forum and another, I opened the unit, found the ceramic fuse where the power comes in and went to Radio Shack. They have a T1AL250V fuse pack that is a 1 amp, 250 volt, 5 X 20 mm SLOW BLOW glass fuse which is a better fuse for this common problem. Their RS number is 270-1063 and a pack of 4 costs about $3. Put new fuse in and the problem was solved.

The repair took minutes - 3 screws on the back and two screws on each side. Lift the cover from the back (it is slip-hinged on the front) and replace the ceramic fuse. It slips out with a little help and the new one snaps in place.

Mar 29, 2008 | JVC TH-C30 System

1 Answer

Koss 2503 blows fuses


You could be having problems with just that outlet  It might not be able to handle that much electricity.  Try the system on a different outlet.  If it still doesn't work, try the system on an outlet on a different fuse.  On an overloaded fuse something as simple as curling iron can blow a fuse.  If none of these work then it's probably a power supply issue.  If the power supply isn't grounding right, this could be causing the system to overload and blow a fuse.  The only way to fix this would be to replace the power supply; however, this might not be practical or possible.  I would suggest simply buying a new system, but if you're up to it go ahead and try to get a new power supply.

Mar 02, 2008 | Koss KS2503 System

7 Answers

Our DVD/Receiver won't turn on and its not a power cord/pluggin in issue...


I had the same power problem with my th-c50. In fact, this is a common problem with this model Home Theater In a Box (HTIB). The issue truly is the fuse. All you have to do is take the cover off and replace the fuse. There are approximately 8 screws total to take the cover off and you can do it with a standard phillips screwdriver. Once the cover is off, the fuse you need to change is underneath and slightly to the right of the power input (if the box in on your lap with the front facing away from you). The stock fuse is a ceramic, white fuse and if you aren't familiar with fuses, it looks like a very small cylinder. The model number is T1AH250V. These numbers mean that it is a 1 amp, 250 volt ceramic fuse, 5 x 20 mm in size. The fuse is held together by four metal posts. Bend the posts back to take the fuse out. Go to Radio Shack or your local hardware store and get a replacement fuse with the specs above. The problem that I had is that none of my local hardware stores had a ceramic fuse with these specs, only glass. I bought the glass fuse anyway (T1AL250V) and it works beautifully. Be sure to buy a "slow blow" fuse instead of a "fast acting" as they are more durable. Insert the fuse into the slot, tighten the clamps, put the cover back on and your done! It doesn't take too long. Hope this helps.

Jun 08, 2007 | JVC TH-C50 System

3 Answers

I need a replacement fuse


Ita on the end in small lettering on the fuse 100%.. You may need a magnifyer to see it. BUT a fusse does not blow all by its self most of the time. It will blow if there is a problem with a circuit and Will case a fire if it is replaced by a larger fude and keeps the circuit from blowing.

Sep 10, 2006 | Koss KS2503 System

Not finding what you are looking for?
RCA RTD258 System Logo

543 people viewed this question

Ask a Question

Usually answered in minutes!

Top RCA Home Theater Systems Experts

Donald DCruz
Donald DCruz

Level 3 Expert

17129 Answers

Cindy Wells

Level 3 Expert

4758 Answers

Ismael Lopez

Level 1 Expert

31 Answers

Are you a RCA Home Theater System Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides

Loading...