Question about Sharp Aquos Televison & Video

1 Answer

Ok, but my power supply is good ,but still very dead

So now where do i go,.i have heard it could be the main board, and do i check this out,.

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  • Carl Peters Feb 19, 2012

    the model lc37d43u, there is no light at alll not blinking or otherwise, nothing,. carl

  • Carl Peters Feb 19, 2012

    the voltage is missing from the input from the main board, and from what i checked all seem find on the power supply,.fuse ok, resisters good diodes good , line in good,.so what would be the most locical place to start to check voltage,.

  • Carl Peters Feb 19, 2012

    well ok i will try that, i usually have very little problemwith these sets so i know how this can throw you off,.

  • Sonny Berry
    Sonny Berry Feb 19, 2012

    Check wire socket P101 on the front Control board ( Where power led is) that plug shoul have +3.3V on both Pins 1 & 2 when using pin 3 as ground. If that supply is good check Diode D103 and Q102 both also on that same board

  • Carl Peters Feb 19, 2012

    thank you i will check,.

  • Carl Peters Feb 20, 2012

    i have tryed the voltage check where the led light is, nothing is thereand all diodes check out good,.,so what do you think , the main board is bad,.

  • Carl Peters Feb 20, 2012

    ok i will do that but as i remember there wasn't and voltage like that, and if it be the power supply where is the problem, everything seems fime,.

  • Carl Peters Feb 21, 2012

    well i did as you asked and there is no power there coming or going so i guess it is the main board, thanks you for your help, now i have to see where i can get a board cheap,.

  • Carl Peters Feb 21, 2012

    does anyone know where i can gety a diagram of the power board so i can repair it, thanks,.

  • Carl Peters Feb 25, 2012

    hi people i thank you all for your help, the problem was on the power board, a diod was the problem, thanks again,.

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  • Sharp Master
  • 8,617 Answers

Need the actual model number from the set. Also does the power light come on or blink? If it blinks let me know how many times its blinking and I will assist with the issue.

Posted on Feb 19, 2012

  • 2 more comments 
  • Sonny Berry
    Sonny Berry Feb 19, 2012

    It has to be the power supply board, or it could be the main but the main would be very unlikely. How have you verified that the power board is good? Was it replaced with a known good one? If so then it would have to be the main board causing the issue or the front keyboard. Remote control doesnt work but do the buttons on the set themselves have any effect??

  • Sonny Berry
    Sonny Berry Feb 20, 2012

    ok check wire plug P9702 for the +5V check it on the main board and also the power boards feed. If the voltage is on the power side and also the main side then the main board is bad. If not it has to be the power board.

  • Sonny Berry
    Sonny Berry Feb 21, 2012

    It would be the power board if there is no voltages on that plug from the power board going to the main.

  • Sonny Berry
    Sonny Berry Feb 21, 2012

    It would be the power board if there is no voltages on that plug from the power board going to the main.

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SOURCE: Vizio P42HDTV Power on Diagnosis

Please check the U29 8 pin little surface mount mosfet it has this letters > FDS4935 > > In this part inputs 13.2 volts which is ok for the near 12 vdc but it > outputs 1.250 vdc i am 100% sure that this is all the problem > > check it out, and tell me if you´re agree with me > > On this output pin it feeds the audio Ic, the 7809 and the tuner side board > which needs de 12vdc too and its getting only the 5vdc part > > what do ya think?? > > Richard

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SOURCE: HITACHI 37PD5200 E Plasma dead.

The fuse is either open or it will have continuity do you have any standby voltages

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Tech4lfe
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SOURCE: Westinghouse LTV-32w6 power light on, no video, no sound

One thing is to make sure the inverter board is unplugged when testing the voltages. A shorted inverter will shut down the power supply if the fuse dosen't blow first. There are fuses that don't look like fuses so they can be missed. The next thing would be to look for a connector from the main to power supply and see if there is a pin labeled power on or p.on or similar. The main board should turn this line high(5V) when you push the power button. If not you probably have a bad main board. Unless you can find good used boards they are both expensive. Around $200 for PS and $300 for main.

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SOURCE: Vizio 42 in L42HDTV10A no power no lights no nothing

Yeah if you don't have any power at all, no lights or anything its the power supply.

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You will have to isolate the main board and Inverters.
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If it "turns on" then try re-connecting each inverter seperately to see if only one is causing the problem.

Posted on Mar 07, 2009

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