Question about RCA F36649 36" TV

1 Answer

Sudden channel changing,flipping off and on and channel searching

I have an rca tv. model number 27V412T. all of a sudden the channels started changing by itself and flipping off and on. and then started doing a channel search. i can not stop the tv from doing either of the three things. i have the tv. hooked up to a DVR cable box. i have disconnected the cable box and is currently using just a cable line from the wall. i have tryed to unplug the tv for hours in hopes that that would reset the tv but nothing has worked. the year on the label says 2005. the picture quality is perfert.what can i do to fix this problem. this has never happened.

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  • patty_carter Feb 28, 2009

    LOST SOME OF THE CHANNELS ON MY RCA F36649

  • gbreuer Apr 11, 2009

    I have the same problem but when I turn it on it makes a popping sound and automatically shuts off.

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1 Answer

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  • RCA Master
  • 73,627 Answers

Main system control memory IC fault. This is a very small IC; have 8 solder terminals, and can be located very near to the main system control-chroma IC. Check and replace it. Be sure to replace it with the same number printed on it; in all respect. Otherwise, it won't go. http://electronicshelponline.blogspot.com/ Before replacing it, try a reset to this set, and then check.
There are two methods to reset TVs. The first is simple to do; a Hard Reset. The other is somewhat skilled; is a Factory Reset (System Reset). To make it a hard reset, just unplug the TV from AC mains wall socket, and re-plug it back after 15 minutes or so. If you do this by overnight is better. This procedure will make it a hard reset. If you want to make it a system reset [Factory Reset]; you have to enter its service mode option, and select the factory reset option. If you wish to get some details; check the site linked here.

Posted on Apr 21, 2017

6 Suggested Answers

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Posted on Jan 02, 2017

  • 1 Answer

SOURCE: channel constantly searching

#1 resolder cpu oscillator crystal #2 replace eeprom ic. #3 go to service menu set parameter "07" to "00" try one of these steps one at a time.

Posted on Jun 16, 2007

  • 6 Answers

SOURCE: TV contantly searching

the keyboard has bad tact switches or the infrared detector has some issues. you can unsolder the keybard switches one at a time, or you can replace the whole keyboard with some of these models

Posted on Aug 09, 2007

likha
  • 790 Answers

SOURCE: RCA 27V412T

ok! change all tact switches! your tact switch has abnormal resistance! thats why your tv is changing system!

Posted on Oct 01, 2007

pantywaste33
  • 9 Answers

SOURCE: powers on and off my itself. Changes channels by itself

i had the same problem. i opened the t.v. took out the circuit board to the buttons and broke off the little resistor things to all the buttons. JUST BE CAREFUL NOT TO BREAK THE ONES LEADING TO THE IR LIGHT. if you can find another button board thatd be a better fix. let me know if you do please. anyway put it back together and use the remote from now on and it wont turn itself off anymore. my guess is one of the buttons shorted out or something.

Posted on Apr 20, 2009

bhatgiri73
  • 106 Answers

SOURCE: RCA TV changes channel and volume, and shuts off by itself.

ok its not a cap problem.. memory ic problem...u have to replace memory ic the nos are i think 24c16 or24c08
u have to buy the memory by giving ur model no of the tv

Posted on Mar 06, 2010

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I repair these for a living and usually this is caused by the "tact switches" (buttons essentially) on the main pcb. This can be fixed easily by someone who is familiar with working with soldering small parts by changing the switches. The problem is most service shops must charge $60-$100 for bench time on a repair like this which is hard to spend with the replacement cost being so low on this product.

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ok! change all tact switches! your tact switch has abnormal resistance! thats why your tv is changing system!

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