RCA LED LCD TV LED60B55R120Q no power

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  • taft1957
    Senior Member
    • Oct 2013
    • 95
    • USA
    #1

    RCA LED LCD TV LED60B55R120Q no power

    This tv is acting very strange. You press power, red standby goes off and tv comes on, perfect picture. it will play all day long. Turn the set off. Come back in a few hours, and it won't turn on at all. Unplug it from the wall, and you might get lucky and it will come on. Then it won't come on. I checked the power supply and it is good. However when set won't turn on, has standby, but missing 12 volts I had a westinghouse with same symptoms, I replaced the power supply, the main board, and the small broad with the eeprom on it. Still the same problem. Is it possible that this is a lcd panel or backlight issue? Has anyone ran across any common issues with LED tv's with this problem?

    Please help
    Taft
    Tags: None
    • ReeceyBurger123
      Never Give Up !
      • May 2014
      • 7325
      • Britain
      #2
      Re: RCA LED LCD TV LED60B55R120Q no power

      Images of the boards ?
      Please Do Not PM My Page Asking For Help Badcaps Is The Place For Advise, Page Linked For Business Reasons Only. Anyone Doing So Will Be Banned Instantly !

      https://www.facebook.com/Telford-Tel...7894576335359/

        Comment

        • taft1957
          Senior Member
          • Oct 2013
          • 95
          • USA
          #3
          Re: RCA LED LCD TV LED60B55R120Q no power

          On this RCA LED LCD TV model LED60B55R120Q where is the LED driver board located?

            Comment

            • CapLeaker
              Leaking Member
              • Dec 2014
              • 8126
              • Canada
              #4
              Re: RCA LED LCD TV LED60B55R120Q no power

              it is not a separate board, it is on the PSU. A connector marked LED +, LED -... etc. There is another connector close by has a BLon pin. Turn the TV on and measure that pin. If the backlight is out, but you have more than 2.5V DC on that pin, I suspect a LED failure. Next would be to take measurements of LED + and LED -. See exactly what happens when you turn the TV on.

                Comment

                • taft1957
                  Senior Member
                  • Oct 2013
                  • 95
                  • USA
                  #5
                  Re: RCA LED LCD TV LED60B55R120Q no power

                  does anyone have a technical service manual for this tv?

                    Comment

                    • taft1957
                      Senior Member
                      • Oct 2013
                      • 95
                      • USA
                      #6
                      Re: RCA LED LCD TV LED60B55R120Q no power

                      Originally posted by ReeceyBurger123
                      Images of the boards ?
                      This one is a service call, and I didn't take any pictures.

                        Comment

                        • taft1957
                          Senior Member
                          • Oct 2013
                          • 95
                          • USA
                          #7
                          Re: RCA LED LCD TV LED60B55R120Q no power

                          I think this RCA is just like my post on the Westinghouse. On the westinghouse I diagnosis ed it as power supply. I ordered a new power supply. Installed the new supply. and no fix, installed new main board, and no fix, ordered new FRC board??? not sure if that is correct name, anyway. I think I have found the original problem on the old power supply, other boards were sent back. I think it is the LED driver transformer. I pulled it off the board, and all my voltages returned. Having trouble finding the part. VLD-LEDTV1251-L7 this is for the Westinghouse.

                            Comment

                            • taft1957
                              Senior Member
                              • Oct 2013
                              • 95
                              • USA
                              #8
                              Re: RCA LED LCD TV LED60B55R120Q no power

                              Here is an image of the power supply/led driver board.
                              Attached Files

                                Comment

                                • taft1957
                                  Senior Member
                                  • Oct 2013
                                  • 95
                                  • USA
                                  #9
                                  Re: RCA LED LCD TV LED60B55R120Q no power

                                  This tv really has me confused. 2 out of 10 times, you can power it up and it comes on and works perfectly for hours. Power it off, and then it will not come back on. With tv on and you pull the cord from the wall, and then 2 out of 10 times, it will come back on. When it is working all voltages are steady, no unusual heat problems. NO unusual sounds.
                                  I troubleshooted the power supply, and reworked about 30% of it soldering. I can't find a thing wrong with it. I tapped around while it was working, to try to get it to shut off.

                                    Comment

                                    • taft1957
                                      Senior Member
                                      • Oct 2013
                                      • 95
                                      • USA
                                      #10
                                      Re: RCA LED LCD TV LED60B55R120Q no power

                                      THere are only three other boards on this tv, T-con, main board, and another small board that I don't know the name, but I know the eprom and microprocessor is on this board. Back when they were all one board, I would have replaced the main board, but i don't know which one to replace. I pulled the ribbon cables one by one, all the ones I could pull, and no signs of life. I unplugged the LED cables one at a time and still nothing. I don't see know it could be the LCD panel or the backlight LED's and work for hours and hours with no issues. I think its a eprom, or main board. What do you guys think?

                                        Comment

                                        • taft1957
                                          Senior Member
                                          • Oct 2013
                                          • 95
                                          • USA
                                          #11
                                          Re: RCA LED LCD TV LED60B55R120Q no power

                                          I should have mentioned this first. When you power the tv on, and nothing happens, if you shine a flashlight on the screen, there is no date, no menu, nothing.g on a No backlight. Just like the set is no turning on at all. It is this way with both remote, and manual button.

                                            Comment

                                            • CapLeaker
                                              Leaking Member
                                              • Dec 2014
                                              • 8126
                                              • Canada
                                              #12
                                              Re: RCA LED LCD TV LED60B55R120Q no power

                                              I'd be looking at the main board. Upload a picture of it, so we can see which one you have. Try freezing the eeprom (can of air upside down) and turn the set on.
                                              Last edited by CapLeaker; 04-02-2016, 04:31 PM.

                                                Comment

                                                • taft1957
                                                  Senior Member
                                                  • Oct 2013
                                                  • 95
                                                  • USA
                                                  #13
                                                  Re: RCA LED LCD TV LED60B55R120Q no power

                                                  Unfortunately the RCA is a in home service call. I forgot to take pictures. However, I think you will understand my question. There are pictures of the westinghouse boards.
                                                  The square board seems to have the eprom and the processor on it. Am I right about that? So the board that your thinking I need to replace is the one with the eprom, right?
                                                  Attached Files

                                                    Comment

                                                    • taft1957
                                                      Senior Member
                                                      • Oct 2013
                                                      • 95
                                                      • USA
                                                      #14
                                                      Re: RCA LED LCD TV LED60B55R120Q no power

                                                      The RCA tv has the same configuration of boards. What I would call the main board on the right. I don't know what that square board is called. However it looks like the main processor right in the middle, and the eprom just off the top left corner of the heat sink.

                                                      thanks for your help

                                                        Comment

                                                        • taft1957
                                                          Senior Member
                                                          • Oct 2013
                                                          • 95
                                                          • USA
                                                          #15
                                                          Re: RCA LED LCD TV LED60B55R120Q no power

                                                          Unfortunately the RCA is a in home service call. I forgot to take pictures. However, I think you will understand my question. There are pictures of the westinghouse boards.
                                                          The square board seems to have the eprom and the processor on it. Am I right about that? So the board that your thinking I need to replace is the one with the eprom, right?

                                                            Comment

                                                            • CapLeaker
                                                              Leaking Member
                                                              • Dec 2014
                                                              • 8126
                                                              • Canada
                                                              #16
                                                              Re: RCA LED LCD TV LED60B55R120Q no power

                                                              You do need a better camera. The first pic is a FRC (Frame Rate Converter) board. The second pic is the main board.

                                                              There are a few different versions of the main board available and I have no idea which one you have. Anyhow... SJ lists a EEPROM for it. So freeze UL2 (it sits top left right above the main IC and under the connector. Can't miss it. Freeze that UL2 IC and turn the set on. Make exact notes and pictures of the boards. Also make measurements of PSon and BLon signal when the TV is going nuts.

                                                              http://www.shopjimmy.com/rca-3393b14...60b55r120q.htm

                                                                Comment

                                                                • taft1957
                                                                  Senior Member
                                                                  • Oct 2013
                                                                  • 95
                                                                  • USA
                                                                  #17
                                                                  Re: RCA LED LCD TV LED60B55R120Q no power

                                                                  Yes, I am real unhappy with this camera. Its a Nikon, and I will never by
                                                                  another, the focus is terrible. Thanks for clearing up my confusion on where the eprom was located. I will order a main board.

                                                                    Comment

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