RCA l42wd22yx6 no video or sound

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  • HotHead
    Member
    • Mar 2011
    • 43
    #1

    RCA l42wd22yx6 no video or sound

    Yup... it just stopped appenrently. Wasnt home when it happened but this is how it went down; TV working fine then the picture goes out but still has sound. Turn it on and off, remains the same no picture but has sounds. Unplug from wall, replug and no picture AND no sound.

    Been reading alot about how to go about inspecting and testing certain things. Found 3 out of 4 burn caps. 2 on the master lcd 'inverter' (i think thats what it is called) and 1 on the slave. Replaced all 4 for some better quality ones.
    Replugged the set in and no visual difference.

    Everything seems to be getting power. Going to go test with a multi meter.
    Will post results with pics hopefully soon.
    In the mean time, if anybody knows anything or can guide me abit it would be appreciated.
    Tags: None
    • HotHead
      Member
      • Mar 2011
      • 43
      #2
      Re: RCA l42wd22yx6 no video or sound

      Ok.
      Tested the power supply. Bear with me i am new at this and trying to learn.
      Might of bitten off more than i can chew but i'm still moving forward.

      Power Supply
      110v coming in.
      i have to 'outs' on the power supply.
      One read +5v(3,4) gnd(1,2) i get 10v coming out
      second says +18v(1) i get 25v
      gnd(2)
      +12v(3) i get 25v
      gnd(4,5,6)
      +24v(7,8) i get 50v
      On-Off(9)
      Video Board
      I followed the wires to the video board and get the same readings
      There are two green light that light uop on this board when i power on the unit. After 15 sec(approx) one goes off and the other stays on. If I hit the power button on the console of the tv it does the same thing.

      Anybody know where i should look next.?!

      I have included some pictures.
      Power supply
      video board
      old lcd master and slave with burned caps
      Attached Files

        Comment

        • retiredcaps
          Badcaps Legend
          • Apr 2010
          • 9271
          #3
          Re: RCA l42wd22yx6 no video or sound

          Hmm, all the voltages are almost double what they should be.

          Let's make sure the multimeter is working correctly first.

          1) Put it on 200 ohms scale if manual. Touch the 2 probes together. What reading do you get?

          2) Measure a fresh or new AA or AAA battery? What DC voltage reading do you get?

          3) What make and model is your multimeter?

          4) We will need a picture as close to 2000x2000 resolution (the forum max) of your power board. The current one is too small to read. PS. Thanks for using the manage attachment function to post your picture.

          5) If your multimeter is working correctly, you may have a solder bridge or short somewhere that is doubling up the voltage?
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            Comment

            • HotHead
              Member
              • Mar 2011
              • 43
              #4
              Re: RCA l42wd22yx6 no video or sound

              Hmmm, yes i thought that to be wierd.
              Considered the multimeter to be defective( or the user )

              1. I do not have a setting for 200ohm. In ohms i have RX1, RX10,RX100,RX1k. If i set to RX100 and touch the prbes i get a reading of 12-12.5 ohms. There is an adjustement on the multimeter

              2.dc v 1.5

              3.dont laugh but its old. Needle style Micronta 22-211 2 jewels, pic attached.

              4. pic attached

              5.???? Is this bridge from the manufacturer? Is a short a short circuit that might be repairable by an amateur?

              Are these pics better resolution? I took them in 12m mode.

              It wont let me upload my hires photos, it says contact admin.

                Comment

                • HotHead
                  Member
                  • Mar 2011
                  • 43
                  #5
                  Re: RCA l42wd22yx6 no video or sound

                  Multi meter
                  powersupply
                  Attached Files
                  Last edited by HotHead; 03-21-2011, 07:37 PM.

                    Comment

                    • Th3_uN1Qu3
                      Believe in
                      • Jul 2010
                      • 6031
                      • Romania
                      #6
                      Re: RCA l42wd22yx6 no video or sound

                      Resize your pictures as close to 2000x2000 as possible (you can use the excellent free image viewer IrfanView for that), and post them using the manage attachments function.
                      Originally posted by PeteS in CA
                      Remember that by the time consequences of a short-sighted decision are experienced, the idiot who made the bad decision may have already been promoted or moved on to a better job at another company.
                      A working TV? How boring!

                        Comment

                        • retiredcaps
                          Badcaps Legend
                          • Apr 2010
                          • 9271
                          #7
                          Re: RCA l42wd22yx6 no video or sound

                          Originally posted by HotHead
                          Are these pics better resolution? I took them in 12m mode.
                          2000x2000 and 2MB is the max for jpg. Just resize them in your favourite graphics program to fit this site.
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                            Comment

                            • retiredcaps
                              Badcaps Legend
                              • Apr 2010
                              • 9271
                              #8
                              Re: RCA l42wd22yx6 no video or sound

                              Here is one idea to verify the voltages.

                              Remove all your connectors from the power board so that the power board is "standalone". That is, the main board, inverter, etc are all disconnected so the power board is running with no load.

                              Remeasure the DC voltages and compare it to the legend. See if the voltages are still doubled or not.

                              PS. 12.5 ohms is a high reading for shorted probes. Check your battery inside the multimeter. Maybe you need a new one? If working correctly, it should read around 0.2 ohms.
                              Last edited by retiredcaps; 03-21-2011, 07:37 PM.
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                                • HotHead
                                  Member
                                  • Mar 2011
                                  • 43
                                  #9
                                  Re: RCA l42wd22yx6 no video or sound

                                  Like i said in the previous posts, maybe its the user...
                                  I changed the battery in the multi meter. The needle seems to stop before maxing out at the other end. I will get a new one tomorrow, maybe an updated version. :-)

                                  I posted the pics, hope they are satisfactory.

                                  I will re-test the power supply as a stand alone now and tomorrow when i get a new meter.

                                  I will post results and most probably more questions tomorrow.

                                  This site rocks guys. Seems to be alot of knowledgable peeps out here.
                                  Thx for the support!

                                    Comment

                                    • retiredcaps
                                      Badcaps Legend
                                      • Apr 2010
                                      • 9271
                                      #10
                                      Re: RCA l42wd22yx6 no video or sound

                                      1) On the power board, are those green caps Samxon GF? If yes, they are a problematic series.

                                      2) I forgot to ask what brand and series you used for cap replacements on the inverter?
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                                        • HotHead
                                          Member
                                          • Mar 2011
                                          • 43
                                          #11
                                          Re: RCA l42wd22yx6 no video or sound

                                          Yes, it looks like most if not all cap are samxon. Oh lucky me...

                                          The replacement cap are nichicon. The tech told me they were good quality.

                                          Is it safe to assume that some of the samxon cap are duds even though they show no signs?
                                          Is it worth checking and replacing theses caps or buying a new board? I do have some time on my hands.

                                          Anyway first things first, new meter and test again.

                                            Comment

                                            • retiredcaps
                                              Badcaps Legend
                                              • Apr 2010
                                              • 9271
                                              #12
                                              Re: RCA l42wd22yx6 no video or sound

                                              Originally posted by HotHead
                                              Is it safe to assume that some of the samxon cap are duds even though they show no signs?
                                              Is it worth checking and replacing theses caps or buying a new board? I do have some time on my hands.
                                              Samxon makes a number of series. Samxon GF are a bad series. If you look at the caps, do see the markings GF?

                                              Nichicon makes a number of cap series as well.

                                              Before buying a new board, let's verify what is wrong first.

                                              edit: Think of car. Honda makes the Accord, but it comes in different "trims". E, EX, ER, etc. Same for caps with their "series".
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                                                • HotHead
                                                  Member
                                                  • Mar 2011
                                                  • 43
                                                  #13
                                                  Re: RCA l42wd22yx6 no video or sound

                                                  I will check tomorrow if they are of gf series.
                                                  The nichicon has the inscription... a9829 pl(m)

                                                  Is there a quality list for when it comes time to buying parts? or is it just word of mouth and buyer beware?

                                                  I just went with what the tech said. Chances are he knows more than me in this field. Blind trust, gotta love it!

                                                    Comment

                                                    • retiredcaps
                                                      Badcaps Legend
                                                      • Apr 2010
                                                      • 9271
                                                      #14
                                                      Re: RCA l42wd22yx6 no video or sound

                                                      Originally posted by HotHead
                                                      The nichicon has the inscription... a9829 pl(m)
                                                      See FAQ at

                                                      https://www.badcaps.net/forum/showthread.php?t=2280

                                                      Nichicon PL are not low ESR caps. On the inverter, it may not matter if the caps are low ESR or not. Low ESR caps are required on the SMPS.
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                                                        • PlainBill
                                                          Badcaps Legend
                                                          • Feb 2009
                                                          • 7034
                                                          • USA
                                                          #15
                                                          Re: RCA l42wd22yx6 no video or sound

                                                          It would be very unusual for all voltages to read nearly double; there are two power supplies on that board. I suspect you were reading the wrong scale. If indeed it is putting out double the proper voltages, I'd say the TV is toast. Some (many) LDO regulators died.

                                                          PlainBill
                                                          For a number of reasons, both health and personal, I will no longer be active on this board. Any PMs asking for assistance will be ignored.

                                                          Never be afraid to try something new. Remember, amateurs built the ark. Professionals built the Titanic.

                                                            Comment

                                                            • Scenic
                                                              o.O
                                                              • Sep 2007
                                                              • 2642
                                                              • Germany
                                                              #16
                                                              Re: RCA l42wd22yx6 no video or sound

                                                              my digital multimeter starts to display random results once the 9v battery is done (around 8V or below)
                                                              was quite a bit puzzled when i measured AA batteries and it showed 4 Volts lolol

                                                              even more odd that it doesn't show the low battery icon till the battery is all the way down to 7.0V (so you'll be measuring bullshit for a while till it actually tells you the battery's dead..)

                                                              just saying.. your multimeter might be messed up like that too..

                                                                Comment

                                                                • retiredcaps
                                                                  Badcaps Legend
                                                                  • Apr 2010
                                                                  • 9271
                                                                  #17
                                                                  Re: RCA l42wd22yx6 no video or sound

                                                                  Originally posted by Scenic
                                                                  my digital multimeter starts to display random results once the 9v battery is done (around 8V or below)
                                                                  8V? Wow, that is pretty poor design (as Dave Jones of the eevblog would say). What brand and model do you have?

                                                                  In his $100 multimeter shootout, the UEi DM391 (using a 9V battery) low battery indicator came on at 3.2V DC and was still within spec.
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                                                                    • Th3_uN1Qu3
                                                                      Believe in
                                                                      • Jul 2010
                                                                      • 6031
                                                                      • Romania
                                                                      #18
                                                                      Re: RCA l42wd22yx6 no video or sound

                                                                      Originally posted by Scenic
                                                                      even more odd that it doesn't show the low battery icon till the battery is all the way down to 7.0V (so you'll be measuring bullshit for a while till it actually tells you the battery's dead..)
                                                                      Plus, an analog meter doesn't have a low battery indicator. Definitely replace the battery before doing any other measurements.

                                                                      Most good meters are designed to make good use of that 9v - 7v is actually a "high" cutoff value. My Uni-T UT60E showed the low battery icon at 6.4v. Cheaper meters usually display low batt at 7.5 to 7v.

                                                                      Originally posted by retiredcaps
                                                                      Nichicon PL are not low ESR caps.
                                                                      Nichicon PL ARE low ESR caps, i have some from the CPU VRM of a dual-PIII board, and fixed a Samsung LCD with one. They are a now-discontinued series with the same specs as PM. Someone here had supplied me a datasheet but i can't find it now.
                                                                      Originally posted by PeteS in CA
                                                                      Remember that by the time consequences of a short-sighted decision are experienced, the idiot who made the bad decision may have already been promoted or moved on to a better job at another company.
                                                                      A working TV? How boring!

                                                                        Comment

                                                                        • retiredcaps
                                                                          Badcaps Legend
                                                                          • Apr 2010
                                                                          • 9271
                                                                          #19
                                                                          Re: RCA l42wd22yx6 no video or sound

                                                                          Originally posted by Th3_uN1Qu3
                                                                          Nichicon PL ARE low ESR caps,
                                                                          My bad. I didn't see them on this forums FAQ list of low ESR caps so I assumed they were not low ESR.
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                                                                            • Scenic
                                                                              o.O
                                                                              • Sep 2007
                                                                              • 2642
                                                                              • Germany
                                                                              #20
                                                                              Re: RCA l42wd22yx6 no video or sound

                                                                              Originally posted by retiredcaps
                                                                              8V? Wow, that is pretty poor design (as Dave Jones of the eevblog would say). What brand and model do you have?

                                                                              In his $100 multimeter shootout, the UEi DM391 (using a 9V battery) low battery indicator came on at 3.2V DC and was still within spec.
                                                                              really old (quality control stamp says 1985) Xerox (by Simpson) 600T1616
                                                                              https://www.badcaps.net/forum/showpo...2&postcount=17

                                                                              this thing is filled to the brim with stacked PCBs..

                                                                                Comment

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