Hello Sir Ruben,
Before we start our session I would like to thank you for using our site (FIXYA) and choosing my service out of many experts here..
If your question is,,It is worth to repair?the answer is yes..
That problem is very common on LCD TV..As a TV tech for 5 years I already encounter that problem many times so I can easily determine the problem only on visual situation so you don't need a multimeter to diagnose the faulty parts..
OK let's start by following the procedure below:
Look sample picture of main board (part # QPWB11378-1G-4) below:
6. If your TV doesn't have back-light the problem is on the inverter board (part # QPWBGL957IDG-1).
This is the sample picture:
Hope it helps..
Please don't forget to rate my answer..
Have a nice day!!!!
Regards,
Chester.
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