Question about Sharp LC-C5262U 52 in. LCD TV
That means you may ahve problem in the power supply or the backlight inverter board. You can disconnect the cable to the inverter to see if the 24vdc comes back on, then you need to load it with 24vdc load that can draw 3~4amp to see if the power supply can handle it OK and maintain 24vdc output. Then you need to check the inverter board for shorts ot burnt out parts.
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Please see my basic troubleshooting guide here:
Posted on Jul 11, 2010
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Posted on Jan 02, 2017
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