help with rca

[sampson159]

i have a rca atc 113b 27" screen. set has a chattering noise when it is plugged in.set does not work at all. it was taken to a repair shop and the h o t was replaced with no effect.tech said transformer was bad and repair would be 200.00.chatter seems to be coming from regulator area and a resistor beside transistor looks discolored.this is beyond my range of technology and would like some help! thanks

[radiotvnut]

Originally Posted by sampson159

i have a rca atc 113b 27" screen. set has a chattering noise when it is plugged in.set does not work at all. it was taken to a repair shop and the h o t was replaced with no effect.tech said transformer was bad and repair would be 200.00.chatter seems to be coming from regulator area and a resistor beside transistor looks discolored.this is beyond my range of technology and would like some help! thanks

First, don't plug the set in while it's in this state. You will blow the power supply.

You should be able to get a HOT and flyback from www.tritronicsinc.com or www.mcmelectronics.com. If possible, try to get an original RCA or HR Diemen replacement. Some of those cheap generics will only bite you in the butt.

Remove the shorted HOT and flyback and the set should power up and talk if everything else is OK.

Also, there is a coil that connects to the base terminal of the HOT that should be resoldered. For best results, remove the coil, scrape off any glue from the coil terminals, clean out the holes on the PC board, reinsert the coil and resolder it to the board. These coils are prone to develop intermittent contact and cause erratic HV. Over time, this condition will blow the HOT.

Those were pretty good sets except for the flyback failures. In fact, flybacks are a high failure part in most recent RCA sets.

[sampson159]

thanks for response.i replaced hot and ordered flyback.resoldered coil as you suggested.now set tries to power up with the green light flashing repeatedly.is this still the fly?i appreciate your help.

[radiotvnut]

Originally Posted by sampson159

thanks for response.i replaced hot and ordered flyback.resoldered coil as you suggested.now set tries to power up with the green light flashing repeatedly.is this still the fly?i appreciate your help.

99.9% sure the flyback is bad and it will short the new HOT if you keep trying to power it up. I just fixed a CTC203 for someone and they said it was trying to power up but was shutting down. I plugged it in, hit the power button and it tried to power up, then the HOT shorted and the P/S started squealing. I yanked the plug to prevent power supply damage as these newer P/S's wont take an overload for very long. A new fly and HOT along with some resoldering got it back going (for now, anyway).

[sampson159]

replaced flyback today and............................................... ......................
that was it!!!! set has been playing about 4 hours now and other than that stupid guide + menu,it looks really good.thanks,rcaman.i am forever indebted to you!