Sharp Aquos LC-46D64U stand by with new boards!

[eTanium]

Ok,

Well, after getting some help on this site, and else where (repair man), I have replaced both the power supply board, and the main board, but still am stuck in stand by - two green lights, followed by a single green light.

What is left, the inverter boards on the sides? The Terminal board?

I see no dead transistors/capacitors, or other signs of failure.

I'm just about ready to bring this thing to the range and let loose the 45 on it, but I don't want to waste good electronics if I can fix them (so far I haven't been able to)!

All helpful criticism/solutions are welcome.

Thanks.

[Mr Bill]

Re: Sharp Aquos LC-46D64U stand by with new boards!

are the green lights flashing or solid?

[eTanium]

Re: Sharp Aquos LC-46D64U stand by with new boards!

Error code Description:
The green Power and Sleep lights blink on and off twice together, and then the green OPC light blinks once. 2-2-1 2-2-1 - Repeat.

[Mr Bill]

Re: Sharp Aquos LC-46D64U stand by with new boards!

http://www.avsforum.com/avs-vb/showthread.php?t=1113905

Skip down to post #5
Does this seem like what your tv is doing? It almost seems like a firmware issue. I did find through goolgle search about a hard reset on AVS forum, but i don't know if this could even be tried since you say the tv won't come out of standby.

Blinking Power Light, No Picture - FIX
Forgive me if this fix has been posted here already, but I wanted to share a fix that brought my TV back to life after I experienced a problem.

This morning I turn the TV on and the picture flashes for a second then goes black. No menu access nothing. The only thing I have is a blinking green power light. I unplugged and waited, still same problem. I let it sit all day, come home, same problem.

So I start looking in this thread and found nothing related when I did several searches. Oddly enough I found someone with the same issue in a review of this TV at Amazon. To fix the no picture, blinking power light (green) problem:
1. unplug the TV
2. hold down channel down and volume up buttons (on the console)
3. plug the TV in.

if you hear a click, you've successfully "reset" the TV. Odds are that fixes this issue, and may fix others. I tried this very thing and like magic, the TV turned on like nothing is wrong.

Again, I'm sure this is common knowledge to this group, but i couldn't find it.

[selldoor]

Re: Sharp Aquos LC-46D64U stand by with new boards!

What you have done here is start a second thread for the same set- and with the same fault code. All the info in the earlier post is lost and I for one am not prepared to skip between threads to try and follow it.
If you are saying you have done it because you have replaced the main boards ( always a gamble, do the numbers and revisions match exactly and was it previously used on a 46 inch - may not work if set for a 32) then you will still have to post pictures front and backs of ALL your boards and your multimeter. At least you will have spare parts!

[eTanium]

Re: Sharp Aquos LC-46D64U stand by with new boards!

Ok, so here's a question, something I didn't think about before...


So, I installed the new boards, and it didn't seem to change the problem I was having, but I didn't reset the tv after installation.

I have done the channel down and volume up reset, and it keeps the TV in stand by with just the power button staying solid green.

Is there another type of reset that I could do? I can't access the tv's menu (or get the power to the screen, i guess) to do a system default reset.

Also, I went to sharp's website for the firmware, and there are two versions. Does anyone know how to determine the correct version of firmware needed? Sharp says check them service/user manual, but I am not seeing it.

[eTanium]

Re: Sharp Aquos LC-46D64U stand by with new boards!

Also, since the main board and the Terminal Board are connected via a bridge, would it be possible that the Terminal Board board was bad, and not the main board, but still throw the error stating that the main board was bad?

Should both of these have been replaced together?

[tom66]

Re: Sharp Aquos LC-46D64U stand by with new boards!

What do you mean by terminal board? The board at the top of the screen?

[eTanium]

Re: Sharp Aquos LC-46D64U stand by with new boards!

What do you mean by terminal board? The board at the top of the screen?

The board that the cable wire would be screwed into, it is linked the TV's main board via a bridge connection of some sort. See attachment for small image (I didn't take it, it was on e-bay).

Main board to the left, terminal board to the bottom.

I went ahead and removed the terminal board, and I see no dead/bad solder points, or any other signs of failure on it.


I have been able to reset my TV and get it to sit in stand by - the power light on the front staying solid green, but I can't see any video, change the channel (figured if I could get to the over the air TV antenna input, I would at least hear some sound), or get to the menu. Any button I hit, including the power button on the site panel results in nothing at all.

Is this whole system dead? Am I beating a dead horse?

[multimeter]

Re: Sharp Aquos LC-46D64U stand by with new boards!

The board that the cable wire would be screwed into, it is linked the TV's main board via a bridge connection of some sort. See attachment for small image (I didn't take it, it was on e-bay).

Main board to the left, terminal board to the bottom.

I went ahead and removed the terminal board, and I see no dead/bad solder points, or any other signs of failure on it.


I have been able to reset my TV and get it to sit in stand by - the power light on the front staying solid green, but I can't see any video, change the channel (figured if I could get to the over the air TV antenna input, I would at least hear some sound), or get to the menu. Any button I hit, including the power button on the site panel results in nothing at all.

Is this whole system dead? Am I beating a dead horse?

ive just finished repairing a sharp aquos tv 46" with main board issues,you can use a mainboard HIGHER ,than a 46" but you cant go lower ie a 32" with no issues if you use a board from a 32"in your tv it wont work if you use a 52" in a 46" it will be ok,there is a standard way that should get you into the service menu,unplug the tv cable out,push in the buttons on the side maked,POWER,INPUT,VOL DOWN,plug in tv with these buttons still pressed,you should get the letter "k"appear,let go the buttons,service menu should come up,there is a reset in there, find it by scrolling through the various options,be carefull what you press!,when your finished ,unplug and plug in again,switch on,if this dosent work then there are main board issues,check on the board size ,compared to your tv.

[eTanium]

Re: Sharp Aquos LC-46D64U stand by with new boards!

push in the buttons on the side maked,POWER,INPUT,VOL DOWN,plug in tv with these buttons still pressed,you should get the letter "k"appear

Thanks for the reply. This reset didn't bring up any menu. The only reset that has worked so far has been the channel down and the volume up reset.

I did indeed buy the correct Main Board for my LC-46D64U. When I do the volume up/channel down reset, the TV goes into standby (solid power light), and I can hear the main board running (like there is current flowing through the chip).

So, if I have a new main board, and new power supply, what would be the next board to check? The inverter, the Terminal Board?

[multimeter]

Re: Sharp Aquos LC-46D64U stand by with new boards!

Thanks for the reply. This reset didn't bring up any menu. The only reset that has worked so far has been the channel down and the volume up reset.

I did indeed buy the correct Main Board for my LC-46D64U. When I do the volume up/channel down reset, the TV goes into standby (solid power light), and I can hear the main board running (like there is current flowing through the chip).

So, if I have a new main board, and new power supply, what would be the next board to check? The inverter, the Terminal Board?

where did you buy these boards?.....

[eTanium]

Re: Sharp Aquos LC-46D64U stand by with new boards!

I bought both of them from ShopJimmy

Power supply
http://www.shopjimmy.com/sharp-rdenc...wer-supply.htm

Main Board (It didn't come with heat sink. I used the heat sink from the old one)
http://www.shopjimmy.com/sharp-duntk...-lc-46d64u.htm

[multimeter]

Re: Sharp Aquos LC-46D64U stand by with new boards!

I bought both of them from ShopJimmy

Power supply
http://www.shopjimmy.com/sharp-rdenc...wer-supply.htm

Main Board (It didn't come with heat sink. I used the heat sink from the old one)
http://www.shopjimmy.com/sharp-duntk...-lc-46d64u.htm

id have a check on that main board that you bought,a heatsink missing???,hmm,any signs of desoldering gone on?...

[eTanium]

Re: Sharp Aquos LC-46D64U stand by with new boards!

I gave it a good look over, and I didn't see anything.

Granted, I have never spotted a bad solder joint before. I don't think the heat sink was missing... I am betting that they just didn't include it in the sale.

As for starting from the power supply board, I have already replaced it, but I am willing to test some of the connections with a meter, as long as someone is able to hold my hand while doing so - I am not very experienced.

I would be looking to check all the outgoing voltages to the other cards, no?

Should I check the receiving end of the other boards (say the main board for instance), where it receives power from the power supply board? Would I get a reading from that if there is no source of power?

Where should I start?

I have attached an image of my power supply board, and labeled the connections going to and from the board.

A) The in connection from the ac/dc converter (not sure correct name - the card that accepts the cord from the power outlet)

B) The power output to the Main Board

C) The power outlet to the Terminal Board (I've heard it referenced as such at ShopJimmy - click for image/link)

D) The power output to the card at the top of the TV (which has an LCD ribbon cable that comes from the main board, to this board - and two ribbon cables that go into the LED lighting, I think)

E) The power output to the power inverter board/s (long brown boards on the sides of the TV) #1 & #2 (which are connected via a bridge)

F) The power output to the power inverter board/s #3 & #4 that run to the right of the TV.


Thank you for your participation in this thread. A case of beer (or favorite beverage) to anyone who can help solve this! haha.

[multimeter]

Re: Sharp Aquos LC-46D64U stand by with new boards!

I gave it a good look over, and I didn't see anything.

Granted, I have never spotted a bad solder joint before. I don't think the heat sink was missing... I am betting that they just didn't include it in the sale.

As for starting from the power supply board, I have already replaced it, but I am willing to test some of the connections with a meter, as long as someone is able to hold my hand while doing so - I am not very experienced.

I would be looking to check all the outgoing voltages to the other cards, no?

Should I check the receiving end of the other boards (say the main board for instance), where it receives power from the power supply board? Would I get a reading from that if there is no source of power?

Where should I start?

I have attached an image of my power supply board, and labeled the connections going to and from the board.

A) The in connection from the ac/dc converter (not sure correct name - the card that accepts the cord from the power outlet)

B) The power output to the Main Board

C) The power outlet to the Terminal Board (I've heard it referenced as such at ShopJimmy - click for image/link)

D) The power output to the card at the top of the TV (which has an LCD ribbon cable that comes from the main board, to this board - and two ribbon cables that go into the LED lighting, I think)

E) The power output to the power inverter board/s (long brown boards on the sides of the TV) #1 & #2 (which are connected via a bridge)

F) The power output to the power inverter board/s #3 & #4 that run to the right of the TV.


Thank you for your participation in this thread. A case of beer (or favorite beverage) to anyone who can help solve this! haha.

can you get a pic of each connector that is going out of the power supply,that also shows the legends printed next to them,in macro mode ,and clear pics from your camera?

[eTanium]

Re: Sharp Aquos LC-46D64U stand by with new boards!

Another thought.

Could the AC Input Board (card that accepts the power cord) be bad and destroying good components even if they are newly installed?

- What should be the power coming out of the AC input board to the main board (connection A on the "input.jpg" attached)

- Is this voltage DC or still AC? (I'm guessing DC)

- What should the voltage be?

- What should I set my meter to to measure this voltage?

- Which prongs should I be putting my meter on? (A 1-2-3 on the attached "input.jpg")

- Should I measure the voltage with the power cord plugged into the wall and the TV, or out of the TV - no power? (bold for danger)

[multimeter]

Re: Sharp Aquos LC-46D64U stand by with new boards!

Another thought.

Could the AC Input Board (card that accepts the power cord) be bad and destroying good components even if they are newly installed?

- What should be the power coming out of the AC input board to the main board (connection A on the "input.jpg" attached)

- Is this voltage DC or still AC? (I'm guessing DC)

- What should the voltage be?

- What should I set my meter to to measure this voltage?

- Which prongs should I be putting my meter on? (A 1-2-3 on the attached "input.jpg")

- Should I measure the voltage with the power cord plugged into the wall and the TV, or out of the TV - no power? (bold for danger)

that picture is showing the ac input,you need a pic of the connectors that are going out of that board,all the outputs will be dc voltage,input is ac

[eTanium]

Re: Sharp Aquos LC-46D64U stand by with new boards!

can you get a pic of each connector that is going out of the power supply,that also shows the legends printed next to them,in macro mode ,and clear pics from your camera?

I will try - my camera is 12 years old, with no macro mode, and a dead battery, haha. I have a cell phone, but it's only 2megapixels.

So here it goes - Referring to attachment "compiled.jpg"

Some images came out blurry, so I added some text in there in Photoshop. Each connection is overlayed in position of where it is on the power supply board (as seen in attachment "power.jpg")



Also, I have attached an image of my meter on here for reference. I understand that there are different measurements for voltage, resistance, and such, and the correct method needs to be used with each (again, you're all teaching me to fish - I greatly appreciate it!!!!)

[eTanium]

Re: Sharp Aquos LC-46D64U stand by with new boards!

that picture is showing the ac input,you need a pic of the connectors that are going out of that board,all the outputs will be dc voltage,input is ac

Still, wouldn't the first thing to check (after checking the power cord from the wall outlet, which I've done already - checked out fine at 120volts AC), would be the DC voltage coming out of the input board and to the power supply board?

If so, what would that voltage be, and what would I set my meter to to test for it (see attachment "meter.jpg")? What pins should I test? I know one is hot, and one is ground (but not which is which), and I also don't know what the third is.