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Sanyo AVM-3289G TV will not turn on

TV started to require multiple button bushes (on the front panel) to turn on. It worked fine via the remote. Sudenly it will not turn on at all. There is a high pitch whine coming from what I beleive is the power supply area. I took my multimeter and measured around the CPU and noted that no voltage is present on the VCC and VSS on the chip. I can not seem to find a service manual to show me a schematic, so it makes it difficult to isolate the problem. The front panel switches and the IR receiver connect directly to the CPU I/O so I would presume there must be voltage always present at the VSS/VCC pins for the power to work. Any ideas for me on what I can check, or further information I can use to fix this TV?

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  • Mikeinca Sep 13, 2007

    What am I looking for on the Cap? What voltage should it be? The 3 pin transistor, what should its pins be/look like?

    I would also suspect the HOT or Flyback, but why would the power button act funky and then stop and now no power on the CPU. I would guess the HOT/Flyback failed.

  • Mikeinca Sep 13, 2007

    It looks like the HOT (marking D1880) is shorted from C>B>E all read 0 ohms.

    There is no voltage present but I would expect that since I can not turn the TV on because of no power to the CPU, right? Do you know if the flyback is across the transistor that would make it appear as a short?

  • Mikeinca Sep 14, 2007

    I removed the HOT and now the 5V comes back. Appears the short caused the power supply to be pulled down. Once I removed this part, I am able to hit the power button and the unit turns on, however, it turns off after 3 seconds. This is due to a voltage monitoring circuit that automatically shuts the unit down when all voltages are not present. I have ordered parts (HOT and Flyback) I will try to replace just the HOT and see if that resolves the problem, if not, I will replace the Flyback as well. I even ordered a spare HOT incase the first pass fails and takes the HOT with it again.

  • Mikeinca Sep 20, 2007

    You were 100% correct. The HOT was certainly bad. The Flyback was fine. I installed the new HOT and put the set back together and it works like new.

  • coolpop Nov 20, 2007

    we were watching a movie and the tv turned off by itself.i tried to turn it back on but it turned itself off again withing a second or two. I have the sanyo avm-3289g

  • adelkhattab Jan 03, 2008

    i was watching a movie and the tv turned off by itself.i tried to turn it back on but it turned itself off again withing a second or two and the light on the front of the tv start to red green red green etc.. I have the sanyo 32" , i hope u can help me

    Thank you

  • Chris Mar 13, 2008

    Sanyo AVM-3289G. Sounds as if it is powering on when power is switched on. No picture or sound and it powers off within a second or two. Fuse is not blown. I appreciate any help. Thank you. Chirs

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Probably flyback in this set, but you can check Horizontal output, a 3 pin Transistor standing up on a heatsink. Also Large cap in powersupply.

Posted on Sep 13, 2007

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