17PW20.1 Vestel problems

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  • tom66
    EVs Rule
    • Apr 2011
    • 32560
    • UK
    #1

    17PW20.1 Vestel problems

    From a Sanyo Vestel LCD, me and sienoki trying to debug it.

    TV will switch on and off several times with a good picture before giving trouble. If it gives trouble, it will blink the front LED on and off.

    Scoped the 24V line and it's got about 1Vp-p of 100Hz on it, sync'd to AC line. It's also making ominous clicking and popping sounds occasionally. So, that looks like a problem. Checked the main cap, just 344V, not 392V like it should be. Boot up self test is a little dodgy - sometimes 24V only reaches 18V, before shooting up to 24V finally.

    Need to figure out why the PFC isn't working or we will just replace 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.
    Tags: None
    • tom66
      EVs Rule
      • Apr 2011
      • 32560
      • UK
      #2
      Re: 17PW20.1 Vestel problems

      OK, here's some scope shots of the ripple.

      I found that if I disconnected the main load on the TV -- the inverter -- it would work pretty much OK. It only ever had problems if you tried to turn it OFF immediately after turning on. I need to confirm if this is normal behaviour, but it seems like it's just crappy Vestel software crashing. It wouldn't give problems turning on and off multiple times, when it did with the inverter....

      AND, the speaker amp is clearly worsening the problem: It has no pop-on protection so makes a loud click through the speakers when turned on. This causes the 12V line to dip to 9V!! I think the combination of the ripple is causing the main board to say enough is enough...
      Attached Files
      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

        • tom66
          EVs Rule
          • Apr 2011
          • 32560
          • UK
          #3
          Re: 17PW20.1 Vestel problems

          And a shot of the input AC current (no defined scale factor, but it clearly shows no power factor correction...)
          Attached Files
          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

            • tom66
              EVs Rule
              • Apr 2011
              • 32560
              • UK
              #4
              Re: 17PW20.1 Vestel problems

              Swapped PSU and it runs nicer now...

              Still crashes but ONLY if you turn it off immediately after turning it on... otherwise, it works fine. Crappy Vestel firmware I'd bet.

              Ripple is a much nicer 450mVp-p (still very high but probably acceptable), at a much higher frequency (not 100Hz.)
              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

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