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Technika LCD42-910 Stuck in standby

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    Technika LCD42-910 Stuck in standby

    Hi folks, first post, be kind

    Pretty certain the fault with this is the PSU. It's a Vestel 17PW01-4. There were 5 bulging caps on the board that I had replaced, and the guy who did it said there was also a dry joint that he fixed. However, when it was refitted it still doesn't work. Just shows a solid blue light (standby). When using the remote you can hear it try and start up, it clicks, but nothing happens.

    The five capos I replaced were the one just under and to the left of the ISOLATED marker on this pic http://www.lcdtvparts.co.uk/index.ph...image&pID=2103. Those 5 were bulging.

    I think I'm going to give up on the analysis of the fault because I don't have the expertise or equipment to go any further. I decided just to look for a replacement, but they're almost impossible to find.

    The part I want is sold by lcdtvparts:
    http://www.lcdtvparts.co.uk/index.ph...oducts_id=2103 - but none in stock It'll be a pull I guess.

    I have managed to find this at CHS:
    http://www.chsinteractive.co.uk/elec...10-hitachi.htm

    However, that's for a Hitachi. I'm not sure if it would be compatible, but it looks almost identical. It looks like TR819 and TR820 have been replaced by a single unit.

    Anyone know if this would work? I checked the full details of the serial numbers. The one I have is 20435001, the lcdtvparts one is 20435003 and the one CHS one is 20435010. All of them are 17PW01-4s. Confused, yes I am.

    #2
    Re: Technika LCD42-910 Stuck in standby

    Wow, I have never seen the 17PW01 before. Is this TV LED backlit? There are a lot of common issues with 17PW supplies, if you have a digital multimeter we can help you diagnose the PSU.
    Please do not PM me with questions! Questions via PM will not be answered. Post on the forums instead!
    For service manual, schematic, boardview (board view), datasheet, cad - use our search.

    Comment


      #3
      Re: Technika LCD42-910 Stuck in standby

      Wow, what a quick reply.

      I'm not sure if it's backlit or not, can't find a decent spec anywhere. The TV is actually my sisters, and she gave me a call when it broke down before Christmas. I said I doubted there would be anything I could do, but I took off the back and noticed those bulging caps and said I'd get them replaced.

      I have no real experience of this stuff, and whilst I do have a digital multimeter I've only used it for measuring the voltage of car batteries and the like :p

      Comment


        #4
        Re: Technika LCD42-910 Stuck in standby

        Across each of the capacitors you replaced, can you measure the voltage on the DC 200V scale, on the isolated side. (Don't worry -- you're not measuring 200V, the highest voltage on the isolated side is around 33V.)
        Please do not PM me with questions! Questions via PM will not be answered. Post on the forums instead!
        For service manual, schematic, boardview (board view), datasheet, cad - use our search.

        Comment


          #5
          Re: Technika LCD42-910 Stuck in standby

          flattvparts sell it by the way
          http://flattvparts.co.uk/index.php?m...ducts_id=13861
          Please do not PM me with questions! Questions via PM will not be answered. Post on the forums instead!
          For service manual, schematic, boardview (board view), datasheet, cad - use our search.

          Comment


            #6
            Re: Technika LCD42-910 Stuck in standby

            I think I'll buy from them. I found it very difficult to find suppliers. Google search threw up lots of dead ends.

            Thanks for your help Tom. I doubt I've the technical knowhow to diagnose the fault, even with your help. I was stuck with where the "isolated side" was and embarrassed to inquire. Would probably have gone up in a puff of smoke!

            So the question for me is whether this is the likely fault. From what I described, stuck in standby, and bulging caps, would you folks agree with me that the PSU is the problem? Don't want to spend £48 and still be where I am now.

            Comment


              #7
              Re: Technika LCD42-910 Stuck in standby

              There are ways to test it using your digital multimeter. See above.
              I've really only seen power supply faults on Vestels.
              Please do not PM me with questions! Questions via PM will not be answered. Post on the forums instead!
              For service manual, schematic, boardview (board view), datasheet, cad - use our search.

              Comment


                #8
                Re: Technika LCD42-910 Stuck in standby

                OK, I'll get that done. Will post back when I know, the TV is not with me though so it'll take a few days. What numbers am I expecting, I'm guessing somewhere around 33V? What numbers indicate a fault?

                Comment


                  #9
                  Re: Technika LCD42-910 Stuck in standby

                  Maximum 33V.

                  Typical voltages are 2.5V, 3.3V, 5V, 12V, 16V, 18V, 24V and 33V.
                  Please do not PM me with questions! Questions via PM will not be answered. Post on the forums instead!
                  For service manual, schematic, boardview (board view), datasheet, cad - use our search.

                  Comment


                    #10
                    Re: Technika LCD42-910 Stuck in standby

                    OK, opened the TV up today.

                    I can't see how it's going to be possible to test the voltages across the capacitors as their connectors are far too short to get a multimeter to contact. There is no space between the bottom of the capacitor and the pcb. I considered taking out the board and bench mounting it to test on the reverse, but thought better of it.

                    As an aside, I trusted the guy who did the replacement to do it right, but I notice that the caps replaced are a different physical size to the originals. Specifically the 2 arranged above each other just below the Isolated marker are bigger. All 5 capacitors are marked Jamicon 470uF25V.

                    Comment


                      #11
                      Re: Technika LCD42-910 Stuck in standby

                      Jamicon caps are no good... and can cause a lot of issues.

                      As I've no schematic for this can you supply a close up pic of connector on PSU, the one that goes to the main board?
                      Please do not PM me with questions! Questions via PM will not be answered. Post on the forums instead!
                      For service manual, schematic, boardview (board view), datasheet, cad - use our search.

                      Comment


                        #12
                        Re: Technika LCD42-910 Stuck in standby

                        Hopefully these are the photos you want. I've taken a shot of the back of the TV with all boards on display, then a close up of the connectors at the top right of the PSU.
                        Attached Files

                        Comment


                          #13
                          Re: Technika LCD42-910 Stuck in standby

                          Gah, I shouldn't have messed about. Flattvparts have sold the board

                          Comment


                            #14
                            Re: Technika LCD42-910 Stuck in standby

                            Came across this. Don't know if it helps.

                            Comment


                              #15
                              Re: Technika LCD42-910 Stuck in standby

                              I got that -- I've got to go now, but will have a look at it later.
                              Please do not PM me with questions! Questions via PM will not be answered. Post on the forums instead!
                              For service manual, schematic, boardview (board view), datasheet, cad - use our search.

                              Comment


                                #16
                                Re: Technika LCD42-910 Stuck in standby

                                Don't want to be a pain on this one Tom, but you had any thoughts? The suppliers I have are all out of stock

                                Comment


                                  #17
                                  Re: Technika LCD42-910 Stuck in standby

                                  What do you measure (volts DC, 200V range) across those brown CapXon capacitors on the inverter board? The inverter board is the green board top left of this image. https://www.badcaps.net/forum/attach...1&d=1360011712
                                  Please do not PM me with questions! Questions via PM will not be answered. Post on the forums instead!
                                  For service manual, schematic, boardview (board view), datasheet, cad - use our search.

                                  Comment


                                    #18
                                    Re: Technika LCD42-910 Stuck in standby

                                    Not getting any reading across them at all, maybe less than 1v if I turn the scale down. Guess this means they are getting no power at all?

                                    I can hear the power board clicking and whining, and the on/off button attempts to do something, but the TV remains stuck in standby.

                                    Comment


                                      #19
                                      Re: Technika LCD42-910 Stuck in standby

                                      How many rows of pins does that connector going from power supply to main board have?
                                      Please do not PM me with questions! Questions via PM will not be answered. Post on the forums instead!
                                      For service manual, schematic, boardview (board view), datasheet, cad - use our search.

                                      Comment


                                        #20
                                        Re: Technika LCD42-910 Stuck in standby

                                        Assuming the main board is the top right one, there's one row (PL804). Both connectors (PL801 and PL802) to the inverter have 1 row. The connector to the IO board (PL814), with the scarts, hdi, etc, has two.

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