Question about LG Flatron L1710S 17" LCD Monitor

3 Answers

Backlight goes off after 2 sec on LG L1710S LCD monitor

Can see the backlight goes off after 2 sec , turning monitor off/on
or removing/ restoring video signal to monitor restores backlight for a short time before it go out again , I can see the display is working by placing a light directly on the monitor .

It is likly a faulty Inverter board , and i wish to repair the existing board , can any one provide assitance in its repair and testing for this model , I have knowlage of electronics.

Regards

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  • 3 more comments 
  • sargon001 May 01, 2008

    have replaced lager higher voltage caps on Power board / inverter board of this unit and looked over the joints , with no change to date , can you specify which caps to change / review specific to the backlight issue

  • sargon001 May 01, 2008

    removing the inverter board , i have replaced 1000uf 25v & 16v respectively electro caps ( 6 in total)

    No bent pins or noticed dry joints seen in general or heated spots , resoldered main drive transistor and larger 1 watt resistors as per general rule , but with no change as yet in the result .

  • sargon001 May 01, 2008

    dont have a manual / cct diag for this monitor , can you advise the cap numbers id on the board that relate to the respective voltages

  • sargon001 May 01, 2008

    yes have done them and the voltage appears stable on both the 12 volt and 5v rails off the connector that goes to the logic board ,

    i will continue to monitor/log both rails to see if there is a change over night ,

  • sargon001 May 01, 2008

    dont know where the 3.3 volt rail are / caps related to them also what does the 3.3 volt do on the board out of interest ?

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Just took mine apart for the same issue, looks like mine is shutting down as only three of the four back lights are working

Posted on Dec 27, 2014

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I would suggest to open the monitor and check for a loose connection or cold/dry solder joint where the lights are connected to the inverter boards.
Let me know if you need more assistance.

Posted on May 01, 2008

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  • Jaime Hernandez May 01, 2008

    You can download the service manual by clicking here.

  • Jaime Hernandez May 01, 2008

    Check page # 26 of the service manual for the list of capacitors that are connected to the 3.3, 5, and 12 volts line.

  • Jaime Hernandez May 01, 2008

    Their locations are C831, C832, C820 and C817. The ones I was more concern for dry conditions are the ones that filter the 5 and 12 volts but looks like you changed them already.

  • Jaime Hernandez May 01, 2008

    The 3.3 volts powers up the microprocessor and the RAM, eproms, etc.

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Your problem could also be bad capacitors, as this user found on his Flatron L1710S.

Posted on May 01, 2008

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