Question about RCA RT2390 System

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Freezing I purchased my theatre system used(already opened) from walmart for a good price. It worked fine, for a while. Then slowly it it started to "hang" when i tried to change to a different input or a change a setting. Recently it has gotten so bad that the unit doesnt power on any more. Sorta. The display is extremely dim, and I can feel the fan running through the vent in the back, but the display never comes on completely. I have experience in digital electronics and this one is stumping me. I don't know enough about the unit to accurately diagnose and solve the problem. I have checked all fuses and plugs inside the unit. And removed the dust from the amp heatsink. Any suggestions would be greatly appreciated.

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  • danman1453 Sep 06, 2007

    I have a multimeter, a soldering iron and a fair amount of patience. It's a pretty good multimeter from sears. (gift card purchase) the model number is RT2390. A lot of the boards inside the unit say RT2380 though. I know the display caps you are referring to, but im unsure of the capacitors around the "u-com." I'm gonna feel stupid if its something I know under a different name. As for experience, I have taken a class in AC/DC and digital electronics in high school. It was a college prep class. Other than that, I have constructed simple digital circuits for personal use. Such as an amp for headphones, a controller for the neons on my car, and a simple hobby power supply.

  • danman1453 Sep 06, 2007

    it is a RCA RT2390. So, yes you are correct. I was looking around this site and found something that works... for now. if i hold the power button and unplug it, then plug it back in, it will turn on. The most number of tries it has taken is 3. I have yet to take any boards out of the unit... will work on that now, and clean them with an air can while im at it. I noticed though that on the smaller board I removed( the first board that the AC hits), there is a solder connection with a large amount of resin. I cant tell under the resin if there is a short where there shouldnt be. BTW, I have been looking for schematics and a service manual for it with no luck.

  • danman1453 Sep 06, 2007

    And yes, i know not to touch anything while it is plugged in, because accidents do happen. In highschool, my ac/dc teach shorted a screwdriver across a fully charged 2 farad cap, and it blew him about 10 ft to his ass. so, I also know to use *extreme* caution around caps. I use a static band at all times the second the case comes off.

  • danman1453 Sep 10, 2007

    For the time being. I took the boards out and dusted all of them off. I haven't been able to isolate anything specific. The trick i found is still working. I'm just gonna save up and upgrade the whole system. If i come up with anything i will let you know.



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Check the capacitors around the u-com. And also the supply capacitors for the display. I can help if u can provide me the model no. and also what kind of experience u have in electronics repair and the tools u have. Cheers. Rifaa

Posted on Sep 04, 2007

  • 2 more comments 
  • Rifaa-ath Razei
    Rifaa-ath Razei Sep 06, 2007

    Yup, u can fix it with that amount of knowledge and patience, I just hope u know u'r way around mains voltage and the safety tht u should take if u going to repaire it personally.
    And the model no. was for the theater system. Give me that so I can see if I can get my hands on a service manual or may be u can. What do u say, so we can go abt fixing it, anyways, u-com is the processor, each electronic unit which can be perform several functions have a chip which we refer as the brain of the unit. Could u find that out. The capacitor will normaly be a low voltage hight capacitance ( say around a Farad....sometimes lower) It is used to as a backup supply for the u-com. so if it leaks, the u-com will hang when ever there is a supply spike or variations. get my point. Just do a routine check for dry solder joints and clean the internal parts with an air blower or a paint brush, be careful with loose parts and remember to have the mains disconnected while u r cleaning OK. keep me posted.

  • Rifaa-ath Razei
    Rifaa-ath Razei Sep 06, 2007

    Hello again.
    Your theater system is an RCA RT2390 5.1 home theater. am I right?

  • Rifaa-ath Razei
    Rifaa-ath Razei Sep 07, 2007

    So How ya doing?
    Any improvements. I found a site that has RCA schema's, if u r interested. But have to pay them.

  • Rifaa-ath Razei
    Rifaa-ath Razei Sep 10, 2007

    Hello, Is U'r problem solved?



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