Sharp Aquos LC46D64U won't give me picture or sound

[bryll79]

Hello all, I am hoping that someone can help me troubleshoot my TV. I have a Sharp Aquos LC46D64U. When I plug in the cord, I hear a click (sounds like a relay) and then I get the power and opc light flashing once, and then just the power light flashing once. Then this repeats over and over again. Once it is plugged in and the lights are flashing, I have tried to take some voltage readings off of the power supply. The only reading the I will get is the 5v from the main board. Everything else seems to be at 0v. Now, when I force the tv on using the volume + and channel -, I do get the correct voltage readings off of everything on the power supply. At first, I thought it was a power supply issue so I replaced it. Both power supplies do the exact same thing. I am assuming that that means the power supply is fine especially since when I force it on, I am getting the correct voltage readings. I could be very wrong though since I am not an expert. I have not replaced the smps. I have read that these can go bad but it is very unlikely. Could it be the inverter board? is there a test I can do to check that? Any kind of help would be great...

[dick_barton]

Re: Sharp Aquos LC46D64U won't give me picture or sound

Do you have any clear sharp pictures of the circuit boards / back of the set you can post.

[SLK001]

Re: Sharp Aquos LC46D64U won't give me picture or sound

I believe that Sharp TVs, once a failure mode has been triggered (flashing lights), have to be RESET to work again once repaired. This happened to me with my Sharp (backlight problem). I fixed the BL, but the TV still "flashed" me. I had to look up the reset procedure for Sharp and do a proper RESET before things would work again.

I don't remember the exact process, but it involved holding down side buttons while pressing the side power button. Work some Googlefoo to find the exact method.

[bryll79]

Re: Sharp Aquos LC46D64U won't give me picture or sound

Sorry guys, I've been gone all weekend. I will post some images later today after work. I appreciate you guys getting back to me!

[bryll79]

Re: Sharp Aquos LC46D64U won't give me picture or sound

here is what it looks like.

[dick_barton]

Re: Sharp Aquos LC46D64U won't give me picture or sound

Have you tried the suggestion given by SLK001

https://www.youtube.com/watch?v=sd8n-dMZ8r8

[bryll79]

Re: Sharp Aquos LC46D64U won't give me picture or sound

I will give it a try and get back to you. thanks.

[bryll79]

Re: Sharp Aquos LC46D64U won't give me picture or sound

Ok, here is an update: I tried doing the reset and it did not work. Now, in my previous message I mentioned that I was getting all the right voltages when I used the channel - and volume + button together. This is not the case. I went through the voltage test again.

PS ON- 3.1v
AC DET- 2.9
BU5 - 5.0v
PNL POW- 0
15v - 0
15v - 0

I am also not getting any voltage from the inverter wires that are coming off the power supply.

Here are the voltages if I just plug it in.

PS ON- 0
AC DET- 0
BU5 - 5.0v
PNL POW- 0
15v - 0
15v - 0

Does this sound like the power supply or a different issue? What other tests can I do to diagnose this further?

[dick_barton]

Re: Sharp Aquos LC46D64U won't give me picture or sound

Are these the readings out of standby

PS ON- 3.1v
AC DET- 2.9
BU5 - 5.0v
PNL POW- 0
15v - 0
15v - 0

And these when in standby?

PS ON- 0
AC DET- 0
BU5 - 5.0v
PNL POW- 0
15v - 0
15v - 0

[bryll79]

Re: Sharp Aquos LC46D64U won't give me picture or sound

The first set of readings are when I do the channel- and volume + and get the power and opc to stop flashing and the power just stays at a solid green.

The second sent of readings happens when I just plug the tv in, hear a click and then the code starts flashing.

[dick_barton]

Re: Sharp Aquos LC46D64U won't give me picture or sound

The first set of reading look like the set is on but missing the 15V and PNL POW.
Disconnect the power supply from the main board and connect PS On to BU5 using a 1K resistor and check all your other supplies come up.