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Thread: Not powering on

  1. #1
    Newbie
    Join Date
    Nov 2005
    Location
    Pittsburgh
    Posts
    44

    Not powering on

    One day my DWW-700h just stopped working. No reason why.

    When powered, the button backlight turns on. Now, it doesn't. I opened the screen up and tested good connectivity from the input wires all the way to the ribbon cable in the back of the screen. (see pics). I am testing with a 12v battery on my bench and a multimeter. The screen was powered off of my PSU. I do not see any signs of burnt transistors, no smell. I secured all other internal connections. Couldn't find any fuses.

    Does anybody have any additional testing ideas? Thanks
    Colossians 1:16 - Everything

  2. #2
    Variable Bitrate
    Join Date
    Jan 2007
    Location
    Szeged, Hungary
    Posts
    293
    That IC between grey wire and tip of your multimeter is a swiching regulator (I suppose LM2575 or so), measure the voltage on the pins. It produces 5V of 12V. Really?

    I do not think, the panel does not have any fuse. Search component written F1 on the pcb. It perhaps does not seem to be a fuse. It sometimes looks like a green resistor or a small white brick, newest models are opaque plastic with small orange spot inside.

    Have you got a photo of MUCH better quality of the panel?

  3. #3
    Newbie
    Join Date
    Nov 2005
    Location
    Pittsburgh
    Posts
    44
    bbalazs, thanks for your response. I found the problem. The ribbon cable towards the back of the unit was a little loose. I checked every connection except that one. Thanks again!
    Colossians 1:16 - Everything

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