Sharp LC-60EQ10U no display code 3-1

[Zduncan8]

I have a Sharp LC-60EQ10U that does not turn on. Minutes after plugging it in. The power light blinks 3 slow and 1 fast. I have replaced the power board, and still the same issue. Anything I'm missing or do I need to replace the main board? I'm not too tech savvy, just looked like a pretty basic fix. Any help is appreciated.

[nomoresonys]

Re: Sharp LC-60EQ10U no display code 3-1

You may have gotten a faulty board.

[nomoresonys]

Re: Sharp LC-60EQ10U no display code 3-1

https://www.youtube.com/watch?v=HaKxWCEaAcw
This guy fixed his with a new powersupply.

[nomoresonys]

Re: Sharp LC-60EQ10U no display code 3-1

https://www.youtube.com/watch?v=mUvclBfaMXg power supply testing, BE VERY CAREFUL WITH POWERSUPPLY, VOLTAGE ON PRIMARY/HOT SIDE CAN BE DEADLY, THE CAPACITORS CAN HOLD A VERY BIG CHARGE LONG AFTER TV HAS BEEN UNPLUGGED.

[Zduncan8]

Re: Sharp LC-60EQ10U no display code 3-1

Yeah I watched that video. Is the power board the only cause of this code? I plan to test the new power board asap and see if it's doing what it's supposed to. Just curious what the other issue(s) could be.

[Zduncan8]

Re: Sharp LC-60EQ10U no display code 3-1

I went to test the board and I am having trouble determining which pin is what. As the pins dont seem to be in any specific order counting them (maybe I'm just overlooking something). I have located the PS ON pin, and it reads 5 volts. I am unable to figure out which pin to jump it too though. As the video lists it as 5VSB, and I do not have that pin. If someone could guide me on which pin to jumper it to, and how the pins are counted itd be much appreciated. I will attach pictures of the labeling. And which pin is the PS ON.

[Zduncan8]

Re: Sharp LC-60EQ10U no display code 3-1

Here is the labeling and pin location.

[budm]

Re: Sharp LC-60EQ10U no display code 3-1

https://www.badcaps.net/forum/attach...3&d=1522413928
The exposed pins you can see from the top side of the board are the ODD number pins, the EVEN number pin (you can see where pin 1 is as marked on the board) you will have to access them from the bottom side of the board or from the back side of the connector using probe with skinny tips.

[amfm144]

Re: Sharp LC-60EQ10U no display code 3-1

I have the same TV and the same issue too. I tested all the pins and was able to pin point 2 pins whose volts did not match with what was listed.

Pin 1 & 2 shows 12V on the board but when I tested it Pin 1 only gave me a little more 7V and Pin 2 was 0V.

So, does that mean the issue is with both Power and Main boards ?

[amfm144]

Re: Sharp LC-60EQ10U no display code 3-1

Sorry, correction Pin 1 gave me a little more than 7V and Pin 2 as 0V

[budm]

Re: Sharp LC-60EQ10U no display code 3-1

Sorry, correction Pin 1 gave me a little more than 7V and Pin 2 as 0V

PNL-12V Pin 1 and pin 2 of the connector PD are electrically connected together so pin 2 should also show the same reading as pin 1.
The 7V PNL-12V output is more likely due to common fails switched 12V LDO regulator IC Q7120 (KIA378R12PI).
See this thread here:
https://www.badcaps.net/forum/showth...602#post592602

[amfm144]

Re: Sharp LC-60EQ10U no display code 3-1

Thank you so much for the quick response.

Is this regulator located on the power board ? If yes, installing a new power board will fix this issue ?

[budm]

Re: Sharp LC-60EQ10U no display code 3-1

Thank you so much for the quick response.

Is this regulator located on the power board ? If yes, installing a new power board will fix this issue ?

Yes it is on the power supply board, just look for that part I give the info about.
That should fix the PNL-12V power supply problem, but I do not what else is wrong with your TV beside the bad PNL-12V, you have to have good power supply first to know if there are other problems with other boards or not.
Do you have tools and know how to solder?

[amfm144]

Re: Sharp LC-60EQ10U no display code 3-1

Yeah that makes sense. Unfortunately, I don't. I'm an IT guy so I have 0 experience when it comes to this stuff. Everything I have done so far is from online reading and research.

Let me see if I can find any tools and tutorial for soldering.

[budm]

Re: Sharp LC-60EQ10U no display code 3-1

I would buy the part and then take the board to good local electronic repair shop and have them install the new part.

[amfm144]

Re: Sharp LC-60EQ10U no display code 3-1

That's a good idea. Thanks a lot.

[Andrew F. Ali]

Re: Sharp LC-60EQ10U no display code 3-1

I would buy the part and then take the board to good local electronic repair shop and have them install the new part.

+10...It would be a lot less expensive rather than replacing the PSU. Try to fix the board first and if that does not resolve the PSU issue, then look for anew board.

[amfm144]

Re: Sharp LC-60EQ10U no display code 3-1

I ended up getting a used power board from ebay and it worked like a charm. Thank you for all your help.

[Andrew F. Ali]

Re: Sharp LC-60EQ10U no display code 3-1

Thanks for the follow up.

[neilc6]

Re: Sharp LC-60EQ10U no display code 3-1

Got this model and the owner had tried a second power supply. Both generate a 3-1 error code. Measured the output of Q7120 and it is 12V on the output and not low on the one ps currently installed. TV doesn't turn on and no backlight. Backlights test good with LED tester.