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Sharp TV technical problems model LC-42D72U?

TV would be on for 30-60 mins and turn off and then come back on. Did this for several times. Did some investigating and found it could be the power supply board. Replaced the board and problem is still happening but not as frequent. Backlight converter? or ? and if converter which one the master or slave? Thanks David

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6 Suggested Answers

6ya6ya
  • 2 Answers

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Posted on Jan 02, 2017

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rlamkin
  • 44 Answers

SOURCE: Replacing backlight inverter board

Not always but usually the inverter board is part of the display panel, way to much money to bother fixin.

Posted on Jul 03, 2008

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  • 5 Answers

SOURCE: Sharp Aquos turns itself off

How many times per second does the POWER led blink? (dont worry about the OPC).

1x per second (constant, steady blink) = bad inverter/lamps
2x per second = bad power supply
3x per second = bad main board

You can buy the parts online and fix if yourself!!

Posted on Aug 16, 2008

  • 1779 Answers

SOURCE: power supply bad on Sharp Aquos LC - bad board - schematic to ID?

Buy the green light going on means Standby is ok. Next, would be to locate the plug coming from the main board to the power supply and find the post that says PO which means power on. With your meter on that post, press the power button as see if the reading goes High, if it does then the main board is able to turn on the power supply. Next, find the plug on the power supply that goes to the inverter( the long board on the side) remove it and see if you have 24 volts coming out of the power supply when you press the power. If you do, then the inverter board is bad, if you don't have 24 v, then the power supply is bad. There are NO diagrams available for these set other than a flow chart if you can find one. A regular svc tech does'nt need a manual for these anyway.

Let me know how you do Kathy ?

Posted on May 17, 2009

johex
  • 75 Answers

SOURCE: Is there a common power issue with Magnavox Model 42MF337B

u have the main switching power supply unit blown. fuse will immediately blow as u have mentioned. they all use smps (switched mode power supply system).  it may be concealed under aluminium plates or cover. look for a  transformer with yellow insulation tape covering near the ac mains input. it is a high frequency tranformer with solid ferrite core. near it there should be the main switching section with a heat sink attached.

Posted on Apr 13, 2010

electrotech1
  • 1126 Answers

SOURCE: Tv works if the backlight stay min. but pickture

It is the power supply and if you replace the bad or bulged electrolytic caps on the power supply, or you can buy a new power supply at www.partstore.com.

Posted on Dec 21, 2010

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