Technika lcd 32-207 intermittently sticking in standby

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  • LesWoollam
    Senior Member
    • Nov 2012
    • 69
    • United Kingdom

    #1

    Technika lcd 32-207 intermittently sticking in standby

    I have a 32" Technika lcd 32-207 TV on the bench which is has started getting stuck in standby. It normally power-up from cold fine, but if I power down after say half an hour it then refuses to come out of standby till it's been 'resting' for a while. There are no bulging caps but the voltage across the main 220uF cap is 337v. Any ideas??
  • tom66
    EVs Rule
    • Apr 2011
    • 32560
    • UK

    #2
    Re: Technika lcd 32-207 intermittently sticking in standby

    Vestel 17PW15, PW20?
    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

    • LesWoollam
      Senior Member
      • Nov 2012
      • 69
      • United Kingdom

      #3
      Re: Technika lcd 32-207 intermittently sticking in standby

      Sorry, 17PW20.1

      Comment

      • Techstar
        Tv Restoration
        • Dec 2012
        • 122
        • United Kingdom.

        #4
        Re: Technika lcd 32-207 intermittently sticking in standby

        Look for a good secondhand board off e-bay (£20) ish. Do barter with board sellers , i have had as much as 30% knocked of some board prices. There is a kit for the psu board if it is a vestel like tom says .. Sounds like maybe a dried out cap in the psu , do you have an esr meter , without one it's guess work...
        Last edited by Techstar; 01-24-2013, 01:29 PM.

        Comment

        • LesWoollam
          Senior Member
          • Nov 2012
          • 69
          • United Kingdom

          #5
          Re: Technika lcd 32-207 intermittently sticking in standby

          No ESR meter I'm afraid. That said, I've already replaced most of the caps but the fault's still the same.

          Comment

          • selldoor
            Slow Learner
            • Dec 2010
            • 7870

            #6
            Re: Technika lcd 32-207 intermittently sticking in standby

            Originally posted by Techstar
            Look for a good secondhand board off e-bay (£20) ish. Do barter with board sellers , i have had as much as 30% knocked of some board prices. There is a kit for the psu board if it is a vestel like tom says .. Sounds like maybe a dried out cap in the psu , do you have an esr meter , without one it's guess work...
            Surely if you get a SH board off ebay you are not going to be in much better position? and have to change the caps on that.

            I would start with replacing the 4 smallest caps on the primary side of the
            PS Board
            Please upload pictures using attachment function when ask for help on the repair
            http://www.badcaps.net/forum/showthread.php?t=39740

            Comment

            • Techstar
              Tv Restoration
              • Dec 2012
              • 122
              • United Kingdom.

              #7
              Re: Technika lcd 32-207 intermittently sticking in standby

              I have a feeling it might need a kit. The price of a kit would probably be not much less than a good second hand board. When i see kits at £20 or a replacement board at £25 it's easy to see which is the best option. Could be on the primary side yes i agree. Maybe a high resistance start up resistor or a cap like you say. The prices of some kits for what they have is a bit of a rip off ... .....
              Last edited by Techstar; 01-24-2013, 02:05 PM.

              Comment

              • tom66
                EVs Rule
                • Apr 2011
                • 32560
                • UK

                #8
                Re: Technika lcd 32-207 intermittently sticking in standby

                This model, it's the two 15nF 630V~1000V capacitors at top of PSU. Swap 'em and it should sort it though I prefer board swap with this model, cheap enough.
                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

                • LesWoollam
                  Senior Member
                  • Nov 2012
                  • 69
                  • United Kingdom

                  #9
                  Re: Technika lcd 32-207 intermittently sticking in standby

                  Thanks, I'll change them and report back.

                  Comment

                  • LesWoollam
                    Senior Member
                    • Nov 2012
                    • 69
                    • United Kingdom

                    #10
                    Re: Technika lcd 32-207 intermittently sticking in standby

                    Replaced the 4 x electrolytics on the primary side and the 2 x 15nF caps. . . problem still there.

                    Comment

                    • tom66
                      EVs Rule
                      • Apr 2011
                      • 32560
                      • UK

                      #11
                      Re: Technika lcd 32-207 intermittently sticking in standby

                      Check voltage across main cap.
                      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

                      • LesWoollam
                        Senior Member
                        • Nov 2012
                        • 69
                        • United Kingdom

                        #12
                        Re: Technika lcd 32-207 intermittently sticking in standby

                        337v in both standby and run.

                        Comment

                        • tom66
                          EVs Rule
                          • Apr 2011
                          • 32560
                          • UK

                          #13
                          Re: Technika lcd 32-207 intermittently sticking in standby

                          There's your problem. It should measure 392V when running. I had this same issue with a Sanyo. I swapped the PSU, the cost of repairing the PFC voltage boost was excessive compared to the PSU price.
                          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

                          • LesWoollam
                            Senior Member
                            • Nov 2012
                            • 69
                            • United Kingdom

                            #14
                            Re: Technika lcd 32-207 intermittently sticking in standby

                            What fails in the PFC? (There doesn't seem to be that many compnents in that part of the circuitry).

                            Comment

                            • tom66
                              EVs Rule
                              • Apr 2011
                              • 32560
                              • UK

                              #15
                              Re: Technika lcd 32-207 intermittently sticking in standby

                              I never figured it out after replacing almost everything in it. The only thing I didn't replace was the PFC IC.
                              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

                              • Techstar
                                Tv Restoration
                                • Dec 2012
                                • 122
                                • United Kingdom.

                                #16
                                Re: Technika lcd 32-207 intermittently sticking in standby

                                Power factor correction is just another annoying add on we could do without.
                                It's like having a tooth filled that don't need filling. It makes the tv a little less of a gas guzzler from what i understand. Yet adds complexity and is just another thing to go wrong,, I got 2 pet hates = lead free solder and the pfc in a psu.

                                Comment

                                • LesWoollam
                                  Senior Member
                                  • Nov 2012
                                  • 69
                                  • United Kingdom

                                  #17
                                  Re: Technika lcd 32-207 intermittently sticking in standby

                                  Bit of a naive question but is there no way of disabling/bypassing the PFC?

                                  Comment

                                  • tom66
                                    EVs Rule
                                    • Apr 2011
                                    • 32560
                                    • UK

                                    #18
                                    Re: Technika lcd 32-207 intermittently sticking in standby

                                    Not really as the PSU is designed to operate on 392V +/-10V. When at 337V it struggles to maintain the 24V output.
                                    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

                                    • LesWoollam
                                      Senior Member
                                      • Nov 2012
                                      • 69
                                      • United Kingdom

                                      #19
                                      Re: Technika lcd 32-207 intermittently sticking in standby

                                      Right, I understand. Looks like it's a replacement board then.

                                      Comment

                                      • selldoor
                                        Slow Learner
                                        • Dec 2010
                                        • 7870

                                        #20
                                        Re: Technika lcd 32-207 intermittently sticking in standby

                                        Thats bad news then still you will now have spares on hand.
                                        Please upload pictures using attachment function when ask for help on the repair
                                        http://www.badcaps.net/forum/showthread.php?t=39740

                                        Comment

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