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Laptop LCD repair. INVERTER bad...

Discussion in 'Electronic Repair' started by Max, Jun 15, 2007.

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  1. Max

    Max Guest

    Inverter has been confirmed bad. I don't have any output from it.

    What usualy go bad with them ? Transfo , caps ?

    Is it a kind of switching power supply ?

    Tks for you help

  2. Oddly enough the fuses like to blow for no reason on these things. I've also
    had problems with the ceramic output caps. If all else fails you could
    always buy one of those CCFL PC light kits. They are usually about $15 and
    you get an inverter and 2 CCFL tubes.

  3. JW

    JW Guest

    In my experience, FET's and picofuses. As Michael has said, often the
    picofuses go for no reason - replace 'em and you're often back in
    Yes. The step-up variety.
  4. rb

    rb Guest

    Anyone ever fix one of the Sony inverters?
    Tokin S405-b001-z1-0 ???
    Rather hard to tell what's what.
  5. Jim Yanik

    Jim Yanik Guest

    Can you find a datasheet on the inverter IC?
    They usually have a circuit that's close to the end product.
  6. rb

    rb Guest

    Haven't tried that,will give it a try, thanks Jim
  7. conundrum

    conundrum Guest

    I've also seen the switching transformers on laptop inverters
    internally short. Usually this results in an inverter which runs
    (badly) but overheats the drive IC(s) and causes them to shut down
    within seconds.

    Only way to test these suckers is by isolating each transformer in
    turn, on most inverters this will result in a shutdown but there will
    be a brief burst of light from the tubes connected to the good

    The other slightly more annoying failure mode is for one of the drive
    transistors to short under load. Here, the test is to measure the
    temperature of the transistor pairs, the bad ones will get MUCH hotter
    than their neighbours.

    In either case, always replace the primary smoothing capacitors even
    if they look OK, as the latter failure mode often results from dried
    up caps.

    Regards, -A
  8. Max

    Max Guest

    Is there any capacitor "built-in" inside the secondary of the transfo ?

    I'm trying to mesure the impedance and it looks open.
  9. Jim Yanik

    Jim Yanik Guest

    I doubt it.
  10. conundrum

    conundrum Guest

    might be because you are measuring the wrong pins? end one will
    measure around 200-1000 ohms to the other.

    Also check those transistors.

    regards, -A
  11. bloodrider


    Sep 12, 2009
    need help with my acer aspire 3054n lcd inverter

    could someone tell me how to fix an inverter? i'm a little bit knowledge about electronics...
    the inverter board number is TDK EA02B397T TBD397NR please help me with this.

  12. alsopranos


    Nov 2, 2009

    Hey everybody new to this forum and seems to be a great place. I got same question like the person above me.

    I got an Acer 1310 with dead lights, its very dark! I assume that the problem is the inverter model: 3HYA1IV0008. Please guys let me know if i can repair it without buying a new one cost me alot of money to ship it to Sweden..

    Can i reapir it?

    Take care everybody have a nice day,
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