Question about RCA RT2250 System

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Rt2250 rt2500 speaker static noise hum buzz until fully warmed up

I was given this unit used and have had it for about three years. It has had this problem and seems like it has gotten worse as time goes on. When I turn on the system, it has no regular sound, just buzzing out of the speakers. If I turn it up more, the buzzing gets louder. I can see a green light is on inside the unit towards the back. When the unit warms up fully (about 20-25 minutes) then the music starts to come in choppy until it finally is fully warmed up and it works well. When it starts coming in the light flashes, and then when it is working fully, the light is off. It does not matter what type of input I use, it still has the same problem. Also, I noticed that if I set my preset equalizer to flat, then I get regular music out of all speakers except the sub. The sub still has the buzz until the unit warms up. All other equalizer presets result in buzz from all speakers until it fully warms up. Any help would be greatly appreciated.

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Re: rt2250 rt2500 speaker static noise hum buzz until...

I had the same problem humming when first turned on, replaced
the 6800uf capacitors works fine now, sound better than its has for a few years.

Posted on Dec 07, 2012

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Re: rt2250 rt2500 speaker static noise hum buzz until...

It sounds like a capacitor in the power supply is just about to die. With the power disconnected have a look at the large tin can looking gizmos near the power transformer. There could be a couple of them. Leave the unit switched off for a while before going near them they could still pack a splat. Replace them with the same value and make sure they're connected the right way and it should solve your problem. Whilst in there have a good look for any other smaller capacitors which look as if they're getting rounded at the top. Replace them too. Either that or dig deep and buy a new one.

Posted on Jul 22, 2006

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SOURCE: RT2500 speaker hum buzz until unit warms up

this problem is CURED simply by replacing 2 capacitors inside on the main board. They are easily identified by a bulge on the top end of the capacitors. The capacitors are located between the heat sinks. The size is 6800uf/16v. I am a RadioShack dealer and sold a few of these in 2000/2001. I bought one for myself. I have repaired only 2 that had the same problem as listed by HAGUC above. They both are working great and for the record. . .are NOT peices of JUNK,. . .hehe. . .they just need a little TLC. Parts available from larger electronics parts houses, not at RadioShack

Posted on May 07, 2007

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The humming is probably caused by failing filter capacitors, these are usually quite large, also look for cold solder joints around parts the heat and cool continuously. Please post an update to further troubleshooting, if this doesn't solve the trouble.

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take the cable of right speaker(which is ok)and put it instead of the left cable if it is ok-your problem will be in your left speaker or its cable-if it is not working the problem in your receiver output stage.(left channel path problem)

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Similar problem here, at first 20-30 min warm-up time, followed by irregularity in sound levels, to a complete failure after using for around 30 minutes after warm up (choppy sound to a steady buzz). I wonder if over heating has something to do with it since I left it on all the time after the need of a warm-up occurred. One night, a horrid buzz came from the system and ever since it would become unbearable to listen too after a few minutes, I am debating either to attempt a fix or chunk it. I haven't tried the caps and fuses yet, but seeing your problem leads me to believe it is something more to the problem, and more likely a better investment would be an upgrade.

Jan 18, 2008 | RCA RT2500 System

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when it is playing a cd? well I guess your optical lens has a problem.. adjusting the variable resistor at the side of the optical lens (you can find the optical lens inside your unit where the cd/dvd is playing)..
if your using for radio? bad solder is the main problem, and a capacitor is almost going to blow( but it won't blow if it was installed properly). changing it is the best way.

Jan 03, 2008 | RCA RT2250 System

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Oct 11, 2007 | RCA RT2500 System

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Sounds like you have an open filter capacitor. Your gonna need to look at the b+ and figure out what cap is bad. A circuit diagram would assist you in this repair. If you have no experience with electronic repairs then your gonna need a pro to assist you with this as there are no user replaceable parts inside this unit. Sorry Man. Good Luck

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RT2500 speaker hum buzz until unit warms up


i have the same system that i bought new and after about 3 yaers it did the same thing for no reason. i think you get what you paid for!!!

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