Question about LG Flatron L1715S 17" LCD Monitor

3 Answers

LG 1715S faulty

I have an LG 1715S, just out of warranty. Suddenly a few days ago the screen went blank, and now if I turn it on and off again the picture flashes up for less than a second, then goes again. I've noticed that the screen is in fact still on, just very very dark.It's the same problem, after switching on the screen shows a picture for about 1 second and then turns black, woth power indicator still on green. This repeats everytime I switch off and on.
The given fix (replace C202, 680uf 25V) seems me to be not valid for my Flatron L1715S with serial-number 401WAAW25488; Productcode: L1715SL-ALEUR; Model L17LA-5. Manufactured January 2004.
In this model C202 is a very small (about 2 mm) part mounted on the small card (80 mm * 73 mm) with the blue connector to the PC video-cable. Repearing this card seems me to be impossible (Card LG Model: L-Chassis-ANAL06; Date: 2003.03.11; PA: 6670T628A62.
The Card with the power Supply (where the faulty capacitor should be) does not contain a C202. THis card is about 178 mm * 110 mm; P/N: 6871TPT241E; barcode: PI3N13FPT241E.
Please Help me: Ad Koper - the Netherlands. ad.koper@filternet.nl

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  • adrianorame Apr 29, 2009

    Hi Robert,



    Thanks for your advise.

    I checked all capacitors on the power-supply card with my finger-tips. No faulty ones found, all have a flat top. The back side of the plate (connections) also look well.

    When I dis-assembled the monitor I found a lot of dust on the plates.

    Question: could the dust cause the fault ?

    If so, could just cleaning the plates and re-assembling the monitor be the solution ?



    Looking forward to your answer,

    Regards,



    Ad

  • adrianorame May 06, 2009

    Hi Ginko,



    Thanks again.

    I removed all dust and re-assembled the screen, but the problem has not been solved.

    I'm sure that your advise is OK, but I don't have the means to follow it up.

    A few weeks ago I started trying to repair it myself, because the advise I found on Fixya was very simple, "just replace one exactly specified capacitor (C202 1000uF 25V)". That seemed OK for just $9,99 to subscribe to FixYa plus about $1 for a new capacitor. But it now seems to be not that simple.

    Now I decided to stop trying and to buy me a new Flatscreen. Prices are now so low that it's not worth spending more time and money to repair the old one.

    I'm just a little disappointed, because I miss the thrill of heaving it fixed myself, but don't blame you for it. It was a nice try.



    Regards Ad

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3 Answers

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  • Master
  • 916 Answers

I just wanted to add that this may be a back light issue. Check the screen with a flash light if there is a faint image it's the back light. I also wanted to let you know that staples is currently having a sale I was just able to get a 19 inch acer flat screen for $89

Posted on May 06, 2009

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  • LG Master
  • 19,396 Answers

The dust can cause shorts and overheating and it is common cause for fault.


When the monitor is on fault state (protection) there is never an universal remedy that can fix all problem, you always need to test component and do troubleshooting.

In your case , more than a faulty power supply you have a bad AC to backlight lamp circuit.

The circuit is integrated on LIMP (power supply) board , and supplies power to the backlight lamp.

Testing this circuit (that replaces inverter) in full may be difficult, as you need to use an oscilloscope to read ~AC out. Reading voltages on inverter is not difficult, but remember that there is high voltage in there.

Downlolad service manual here.

Follow instructions at page 12 using block diagrams , exploded views and schematics to test LIMP and main board that can both cause the problem.


Don't forget to leave feedback.

Thanks.

Posted on Apr 29, 2009

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  • Master
  • 5,158 Answers

I just finished fixing an acer 20 inch monitor with the same problem. it will need to be disassembled and some capacitors have to be changed. to find the bad capacitors you need to feel the tops of them... if they feel rounded... they need to be replaced. if you can't do the repair yourself it may be more cost effective to buy a new monitor.... very inexpensive and larger ones for sale at the moment. perhaps have a look at www.tigerdirect.com to see what the prices are now. if you can repair it yourself the cost would only be about $5.00 or so plus the time you spend doing the repair.

Robert

Posted on Apr 22, 2009

  • Roberta Smith
    Roberta Smith Apr 22, 2009

    forgive me for not being complete in my answer... you need to use your fingers to find the bad capacitors... ignore looking for one in particular. but it will be in the power supply section.

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Replace capacitor C202, 680uf 25V. It is usually visibly damaged. It should be a low impedance type, often known as "suitable for switch mode power supply".

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