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

Open Question

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

Posted by on

3 Suggested Answers

  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

a 6ya expert can help you resolve that issue over the phone in a minute or two.
best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.
the service is completely free and covers almost anything you can think of (from cars to computers, handyman, and even drones).
click here to download the app (for users in the US for now) and get all the help you need.

Posted on Jan 02, 2017

  • 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.


Posted on Feb 15, 2011

  • 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

Add Your Answer

Uploading: 0%


Complete. Click "Add" to insert your video. Add



Related Questions:

1 Answer

Lg 42ln5400 no power

Standby light voltage (3.3VDC) is generated from the main digital board. If there is no standby light, means this voltage is absent. Check it, Replace the main digital board, if needy.

Feb 13, 2017 | LG Televison & Video

1 Answer

Haier LE50H3280 will not power on

If all power supply voltages are within specs, then it just might be an issue with your main board,.

If PS board has a relay make sure that it is also working.

Oct 18, 2016 | Haier Televison & Video

1 Answer

No Standby voltage and no led

The standby voltage comes from the main power regulator board itself. If there is no standby voltage, there is no need to go further. Replace the main power supply board [SMPS] as card basis. If you wish to get some details; check the site linked here. Viewing it in "Mosaic" will make surf easy.

Feb 17, 2014 | Panasonic Viera TH-50PZ80U Plasma TV

1 Answer

My Sony Bravia HX8/46 will not turn on, I check all the power going to it and it all works. Is there something I can do?

Is the standby led on the front lit. If not likely the problem is with power supply. If the standby led is on does it go off when the power button is pressed? Does the led blink. If so count the blinks and get back. The power supply provides an standby voltage to the main board. If the standby led is lit then this voltage is present. When the power button is pressed the micro sends a turn on voltage to the power board. Normally the power supply will respond and all other voltages needed to operate the set will come up. if a component is shorted the micro will not turn on the power board and will usually give a failure code via the standby led.

May 31, 2013 | Televison & Video

1 Answer

Orange light on vizio no bad caps

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!

Feb 08, 2013 | Vizio SV471XVT 47 in. LCD TV

1 Answer

How do I test a High Voltage Transformer on my Vizio VU42L-FHDTV10A?

It could be the main board. The main board controls the standby light on the front of the set. Check and verify that your 5vdc standby voltage is working. Next, I would check the "on" or "ps on" input on the power supply board. When you turn the set on (either my side buttons or remote) the main board should send a 3.3vdc signal into the "on" terminal on the power supply. This "on" signal from the main board turns on the other half of the power supply thus turning on your set. If you are not getting this signal from the main board, I would suspect the main board. To test your power supply, you can simply put a jumper from 5vdc to the "on" terminal on the power supply. Your 12vdc, and 24vdc power supplies should then become active.

Oct 31, 2012 | Vizio Televison & Video

2 Answers

Soniq tv manuals

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.

Apr 30, 2012 | Televison & Video

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:

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.

Oct 18, 2010 | Hitachi 26LD6600 26 in. HD-Ready LCD...

Not finding what you are looking for?
Sharp Aquos 65" LC-65D64U LCD TV Logo

Related Topics:

26 people viewed this question

Ask a Question

Usually answered in minutes!

Top Sharp Televison & Video Experts

The Knight
The Knight

Level 3 Expert

74136 Answers

Jaime Hernandez

Level 3 Expert

2318 Answers

Cindy Wells

Level 3 Expert

5103 Answers

Are you a Sharp Televison and Video Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides