Question about Sharp Aquos 65" LC-65D64U LCD TV

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Standby power voltage

Where on the power board sold I check for the standby voltage? There are two power boards mpf3930 and mpf3931. I have no standby led. Thanks

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3 Suggested Answers

6ya6ya
  • 2 Answers

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Posted on Jan 02, 2017

joeguest2
  • 2080 Answers

SOURCE: Doesn't power up. Relay clicks several times,

First of all you should weight the cost benefit of repairing the set versus purchasing a new one.

Depending on the size and model of tv, it may be more prudent to simply cut your losses and buy a new tv rather than spend money swapping out circuit boards in the hopes of repairing a set in questionable condition already. Main / Power Supply / LCD Controller boards will typically run you about $100 each to replace, so weight that against the purchase price of a new tv that comes with a warranty.

Given that, if you are still intent on trying to repair the tv, and it does since you have gone out and acquired a service manual, there are steps you can take.

First of all the service manual should give you some idea what the blink pattern means on the front panel lights. Look that up first.

It does sound power supply board related, but bad capacitors are not always as obvious as the tell-tale bulging or gunk-leaking ones.

Use the manual to find out what voltages you should be getting out of which wires coming off the power supply board. In general, some will be 5VDC, some will be 12VDC, and some will be 24VDC. Test them with a multimeter and see if you are missing any.

Obviously this test requires you to have the unit plugged in and powered up with the safety covers removed. I cannot stress enough the potential dangers involved and if you are not confident with that level of maintenance, I would recommend you leave the live power tests to the trained technicians.

You said you didn't see any bad capacitors, so you may want to just unclip, pull out and then reseat all the multi-wire connector you can get to in case one of them just has a bad connection.

Good luck in the troubleshooting.

If you have any questions or require any further assistance please comment back on this page and I will do my best help you. Please provide the model number of your tv next time as well.

If this was at all helpful, please click on the 4 Thumbs Up rating icon above.

Thank you very much.

Joe.

Posted on Feb 15, 2011

vinceisaac
  • 2432 Answers

SOURCE: Sharp Aquos LC-C3237U no picture backlight OK green light on

check if their is a signal on voltages around 3.3v at the inverter board if none their is a problem in the board which is in the processor.

Posted on Aug 31, 2012

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You may be buying a main board, only a few guys in the industry even bother servicing main boards. Outside of a bad cap, fuse, or regulator its time to replace the board. If you have standby power, and you're not getting the "PS ON" signal from the main board, your main board is bad!

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2 Answers

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I have fixed 2 soniq tvs that were stuck in standby ie would not turn on via the power switch or remote.
One of them would turn on briefly and then turn off again while the other just refused to even try to turn on.
I thought it was a problem with either the power board or the main board but it was not.
The control board was detecting a problem and was shutting down power board.

The fault with both of them was that the LVDS cable that connects the main board to the T-Con board had poor contacts with the sockets it is plugged into.
Solution was to CAREFULLY unplug the cable at both sockets..don't pull it by the cable or you may disconnect a wire within the cable... and give the pins on the sockets a little spray of electrical contact cleaner then refit the cable securely...make sure it is pushed fully into the sockets.

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1 Answer

Hi My Hitachi is in standby mode (not turning on - only have red standby light on). I have visually checked capacitors on 3 main boards and none appear to have expanded. Any ideas please?


First thing to do is measure the output voltages of the power board. You're looking for the one that provides standby power, usually +5V or +3.4 V and in some rare cases other voltages.

Don't know what it is for your TV, but it will sure be available on the power board if you see the red LED there.

Next you look to see if upon pressing power the main board signals to the power board to turn itself fully on, i.e. start generating the rest of the supply voltages.

There's a pin on the power board's connectors that is labelled "PS_ON" or just "ON" or something similar.

It should raise to +3V or so when you press the ON button.

For an example of a simple power board see this:
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If you do not receive that signal then the problem is in the main board.
if you receive that signal, but the power board does not generate the additional voltages that it outputs to the other boards then the problem is in there.
And if it wakes up and provides those voltages but the TV is still dead then the problem is in the main board, which usually needs to be replaced.

Hope this helps. If it does do not forget to rate it :-)

if you need more help - supposedly paid though - feel free to contact us.

www.coppelltvrepair.com

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