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Thread: LCD inverter for TX18D16VM1CAB

  1. #1
    FLAC Nomader's Avatar
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    LCD inverter for TX18D16VM1CAB

    Does enyone knows where i can find a new inverter for this panel:
    TX18D16VM1CAB http://www.multicell.it/get_document...d0059310b8e435
    seems mine is busted..
    Or maybe anyone recognizes the SMD fuse (which i am told is 90% the fault)??
    thanks
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    Last edited by Nomader; 12-02-2013 at 02:35 AM.

  2. #2
    Raw Wave
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    The fuse should be easy enough to test with a DMM - either that 5V exists on both sides (preferred method), else low-Ohms resistance in BOTH directions, but that has a risk of blowing sensitive circuitry.

    When told that the fuse "is 90% the fault", did that exclude other components being blown (eg, MOSFETs etc)?

    If blown, see if the fuse can be extended - ie, solder wires to existing fuse to an external fuse. Otherwise piggy-back the new fuse.
    Of course if something else caused it, it may just blow again (hence test current first with a DMM).

    Check with Littelfuse, Digikey, Farnell etc.

  3. #3
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    thanks for the reply..
    Is there an easy way to check if it's the inverter or the ccfl? except touching the inverter output 1000V and see if it hurts?
    from what i read the 1000V (30-50Khz) would not be detected by a normal multimeter..

  4. #4
    Raw Wave
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    I doubt the inverter is as much as 1kV; 400V (peak) is more like it. Many DMMs have 600V ranges or similar.
    And the frequency shouldn't matter even if it is an AC output.

    But why not try a resistive voltage divider to play safe - say 10M & 1M, or 1M & 100k for a 1:11 ratio?


    Though it may be worthwhile waiting for others with actual experience to agree with me, or otherwise.

  5. #5
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    an update..
    it was the inverter after all..
    I bridged the smd fuse (i know... i know...) it worked ok for some minutes.. then suddenly PFFFFFFFFFFFFF smoke everywhere..
    it took down 1 transistor..
    So it was the fuse, but as you pointed out, the fuse was not the main reason..
    So the inverter is toast..
    Thank god i had an old HP DV5 notebook LCD around.. opened it up took the inverter.. figured out the pins (wasn't that difficult with the multimeter) The voltages are the same.. I lost brightness control (my LCD had an autoDimmer) but i don't care..
    the display is back in the car

  6. #6
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    Well, it's kind of good news.
    It's like they say - fuses blow for a reason. Of course that reason could be some intermittent fault, or because the fuse has had enough thermal stresses (near blows that accumulate).

    I'd suspect it's probably the upper central big transistor (MOSFET?) that's blown, but irrespective of that, other things may have gone with it.
    The TL494 is a common SMPS chip.

  7. #7
    FLAC mauri's Avatar
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    Monitor CTF700-H transflective...600 nits...
    If yes, the problem is the the upper central mosfet on board of the inverter.
    The TL494 generate PWM pulse for drive this mosfet, but more problable TL its ok, and blown the mosfet.

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