Question about Philips 170B4MG 17" LCD Monitor

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I AM A RETIRED TV ENGINEER (FOR THE LAST 50 YEARS) IHAVE A 170B4BS/02MONITOR WITH POOR /NO START UP. THE ALWAYS 12 VOLTS HUNTS IN STBY 4 V TO 12 V. ON A GOOD PSU IT IS 12 V.HAVE CHECKED CAPS (ESR) AN

  1. PSU FAULT
  2. PHILIPS 170B4 17"MONITOR

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  • sawraj May 11, 2010

    if it is IC 3842 supply check dirve comming on the anode of the fet6N60

  • satinwolfe May 11, 2010

    What are the symptoms?  If the monitor comes up with an image for a short time, then goes black, it's the backlight inverter.  I got around the problem by bypassing the overcurrent trip.  I suspect that the CCFL tubes draw more current as they get old, and trip the inverter.  The backlight on the monitor I hacked is usually not on, so it's not a problem.  For a more permanent solution, I can suggest a new inverter or if that doesn't work, new backlight tubes.

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Hi
I have the circuit diagrams...can you tell more about your hack, please?
Thanks
Peter

Posted on Feb 22, 2011

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