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Daytek DT3220 power button flashes green 4 (5) times, no picture

I have a two year old DAYTEK DT3220 LCD TV. When powered on with remote or front button, it goes green for about 1/4 seconds, and then flashes 4 more times (staying dim gren aftewards).

When one turns it off, the backlight comes on for an instant and the picture in picture box is visible on the lower right of the screen.

I've checked the power supply (these models are famous for problems with it) but am showing a solid 5, 12 and 24 volts on the outputs.

Anyone able to advise me what to look at next ?

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The power supply voltages might look good on an oscilliscope or using a DC meter, but that doesn't really tell you if the supply is good.

Your TV has an unusual symptom, however 99% of the problems on these TVs are caused by the power supply. I have had 3220s that won't power on, the remote or controls on the TV won't work, or the unit blanks out and all sorts of other odd problems. The power supply can test fine, but if you substitute it the TV will work fine.
Sorry to say you're up a creek. The good news is that just about any 5,12,24V power supply for a 32:" TV will work if you are comfortable rewiring the connectors. I have done this a few times and rescued the TVs from an early grave (I'm actually just about to start on another one now). The pinout is written on the board, and make sure the power supply you want to use also has the pinouts marked on the board.

Posted on Jul 22, 2009

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  • Mergatroid Jan 21, 2010

    This is an update to this TV problem. Over the years we have had many of these TVs come in with different problems.
    1: Controls not working - needs a new main board - not available
    2: Any display defects - main board or LCD panel - not available
    3: LED blinking in pattern, no video, remote won't work, blanks out.

    The problems in #3 can be repaired by replacing the power board. You have to find a power board with 5V always on, 12V switched, and 24V switched.

    Switched means those voltages stay off until the TV is turned on. You should look for a power board that at least has the same width with mounting holes in the corners. You need at least two of the holes to line up with the mounts on the chassis. You can use hot melt glue and stand-offs to secure the other end of the board. If you do this, make sure you use some wire to ground the output side of the power board to the chassis.

    You will have to rewire the connectors that go from the power board to the main board. This can be hard to do, and soldering will be required. So you will need a power board that has the outputs marked on the board.

    One more thing: You need a power board that can use an inverted "enable" signal from the main board. With this TV, the main board enable signal (S) is on (5V) all the time. When you turn the TV on, this signal drops to ground to turn on the 12V and 24V. If you cannot find a power board that can use an inverted enable signal, you can wire in an inverter IC (74LS04). This will invert the enable signal from the main board, only requires 4 wires and is fairly easy to do. I use hot melt glue to secure the IC to the chassis. Make sure you either use enough glue to prevent the leads from touching the chassis or mount it on the plastic pad located under the power supply. Cut off all the IC leads you don't use.

    Please note. The original power board is a sneaky thing. The power lines can measure good with an oscilloscope but it can still cause the blanking out issue. Don't be fooled into thinking it's good.


  • Mergatroid Jan 21, 2010

    Man this is a strange site. For some reason it logged me out before my comment was saved.

    The update was written by Mergatroid Jan 21 2010.


  • Mergatroid Jul 23, 2010

    Just google 74LS04 data sheet. The datasheet will give you the pinout of the IC. It will contain four inverters.
    You need to connect the 5V live to the always on 5V from the supply, and the ground pin to ground.

    Now, run the enable signal from the main board to the input of one inverter, and the output of that inverter to the power board. Four wires: 5V, GND, Invert In, Invert out.


  • Mergatroid Jul 23, 2010

    Google 74LS04 Datasheet. This will give you the pinout.

    On the chip: +5V to the always on +5V on the power supply.
    GND to GND
    One inverter input to the main board S (enable) line. (there are four inverters).
    The same inverter output to the power board enable line.

    That's it. +5V, GND, Invert In, Invert Out.


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Does anybody have a drawing of this inverter circut using the 74LS04 to invert the enable circut?

Thanks

Posted on Jul 18, 2010

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