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Sanyo DP42840 with power on issue. I press power button and Green power LED lights for 10 seconds as it goes through its normal start up / warm up procedure. Instead of powering on, the TV powers off totally. After an attempt at powering on, I must unplug the unit, and plug it back in to attempt another power cycle. I would like to know the trouble shooting method I would use to determine if this is a main board, power board, or Tcon board issue. I have a nice multimeter, and time to test things :)

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  • Televison & ... Master
  • 74,106 Answers

Fault at its main digital board. Short circuited component/s at it. Contact any service technician; or the authorized service center. If you wish to get some details; check the site linked here. Pull up older posts.
http://electronicshelponline.blogspot.com/
In most cases, the main board might have to be replaced. If so, a software [firmware] update too might be necessary.

Posted on May 19, 2017

6 Suggested Answers

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Posted on Jan 02, 2017

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

Posted on Apr 13, 2008

jerryg50
  • 1667 Answers

SOURCE: sanyo dp42746 low volt power problems

The power supply is failing, or there is another circuit area that is pulling too much current, and the supply is going in to protect mode.

This would require proper troubleshooting by an experienced tech. If the problem is very involved, or the tech is not familiar with the set, he will require the service manuals and service information.


Jerry G.



Posted on Apr 27, 2008

Tech4lfe
  • 38 Answers

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.

Posted on Jul 06, 2008

  • 36 Answers

SOURCE: Power Up Problem

You have a 8.6v supply error according to the 7 error code being displayed, what you can try is when the set goes to blinking disconnect the Y sustain board (if looking at the tv from the back the board on the left) from the upper left side of the power supply, if the error code stops then you know your Y sustain board is pulling down your power supply and causing the error, if the error code continues you have a probelm with your Logic Board (located under your Small Signal Board) disconnect this from the Y sustain board and see if the error code stops if it does you know that the Logic board is bad, if the error code is still blinking then the 8.6v supply line from the Power supply is faulty and the Power Supply needs to be replaced

Posted on Aug 13, 2008

  • 1 Answer

SOURCE: magnavox 32mf23id/37 wont tun on

Had the same issue, I replaced two 1200uf caps on the power supply board and now it works fine again. Remember to replace the caps with caps rated for at least 35wvdc.

Posted on Mar 27, 2009

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This could be the tuner overheating and sending a signal from the tuner board CPU to the power board to instruct the tuner to turn off. Check that there is adequate ventilation in the TV. Try testing with a fan to see if that changes the behaviour of the loop that you get.

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If you wish to get some details; visit the site linked here. Pull up older posts.
http://electronicshelponline.blogspot.com/

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Being a new set it is important that you should have tested the model to your liking in the showroom. However some of these models have poor sound as the sound is normally fed into the home audio system. So if you have any audio system connect the audio outputs to the auxiliary and you will be able to get better sound.
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