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RCA L42FHD37YX8 no sound or pic but the blue light on the panel is on and when you press bottens on the remote the light flashes as it always has.

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I hope you still have this TV! Your problem is with the power supply, There are three transistors on the power supply that you should change (Costs approx. $0.45). These are adjustable precision shunt regulators. I believe they are labeled IC IC7, IC8 and IC9 which are all the same transistor (part no. TL431AC). While you have the board out, make sure that none of the capacitors are swollen/bulged; if any are, replace.

Posted on Dec 23, 2010

  • GrtOutdoorsAZ Dec 06, 2011

    I'm having this problem with my 42" RCA (same model). When we first start the TV in the morning, the screen will go black but the blue light in front will stay on. After 5-10 seconds, the screen comes back on. It will usually do this a few times over 10 minutes or so (until it's warmed up?). After that, the TV works fine the rest of the day.

    Thank you for this post dillspapa. I purchased shunt regulators to fix the power problem.

    Question - do I need to do any ESD type precautions before opening up the TV panel? I noticed on the shunt regulators, it came in a pink ESD bag and says not to open until in a protective workstation. Also, inside the TV, is there anything I should be cautious off etc? I dont want to shock myself or mess something else up while I'm in there. I appreciate any tips and comments!



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