Sharp Aquos LC-60LE640U Won't turn on

[StodgyWaif]

Hello.

This TV is giving a 3 long and 1 short error.

The service manual states:

Initial communication reception failure

Initial communication from the main CPU is not
received. (Request for the monitor model No. is not
received.)
Communication line failure or main CPU start-up failure

Is this a main board failure?

I have tried entering the service menu (input and vol- while plugging in) and also the error bypass (vol+ and ch- while plugging in)

The LCD panel does not come on.

Any help/advice is appreciated.

[dskall]

Re: Sharp Aquos LC-60LE640U Won't turn on

Sounds like maybe eeprom failure to load data to cpu

[StodgyWaif]

Re: Sharp Aquos LC-60LE640U Won't turn on

Sounds like maybe eeprom failure to load data to cpu

Okay, thanks for responding. I considered trying to load the firmware. Not even sure if it's possible.

EDIT:

I put the firmware on a freshly formatted fat32 USB and tried both USB ports. Held power for 5 seconds while plugging in.
No response.

[mmartell]

Re: Sharp Aquos LC-60LE640U Won't turn on

Make sure the name and extension of the file is exactly as the tv expects it.

[StodgyWaif]

Re: Sharp Aquos LC-60LE640U Won't turn on

Make sure the name and extension of the file is exactly as the tv expects it.

I tried BSMK_LE640_222.USB per the service manual instructions. The file I downloaded from Sharp's site was BSMK_LE640_222.UVP

I put both on the USB drive to be sure.

I tried the drive in both USB ports and held power for 5 seconds while plugging the TV in. The display never comes on and I left it for quite a while in case it was updating without the display on.

The TV just keeps flashing the error lights.

Could I be missing something?

[mmartell]

Re: Sharp Aquos LC-60LE640U Won't turn on

Well if there's a hardware fault on the mainboard no amount of cajoling will force it to take the firmware.

[mmartell]

Re: Sharp Aquos LC-60LE640U Won't turn on

By the way I don't want to insult your computer prowess but be sure the file isn't actually BSMK_LE640_222.USB.txt or something similar due to Windows.

[StodgyWaif]

Re: Sharp Aquos LC-60LE640U Won't turn on

Thanks for the responses.

Is there any chance the power supply would be the cause of the error? Or is that unlikely?

I'm looking for a replacement mainboard and I'll purchase a power supply as well if necessary. I'd just like to avoid buying unneeded parts.

[dskall]

Re: Sharp Aquos LC-60LE640U Won't turn on

I doubt it is a power supply problem

[StodgyWaif]

Re: Sharp Aquos LC-60LE640U Won't turn on

I received the replacement main board today.

It did fix the error code but the TV back light is not coming on.

The power button works normally. And if I leave it on for a while (10 min?) it will shut itself off.

Also, the main board has a green LED that flashes slowly.

Is this repair worth pursuing further?

Could the power supply be the problem now?

[dskall]

Re: Sharp Aquos LC-60LE640U Won't turn on

With a flashlight do you see an image on screen? What dcv do you get across legs of one of your main caps at center of board?

[StodgyWaif]

Re: Sharp Aquos LC-60LE640U Won't turn on

With a flashlight do you see an image on screen? What dcv do you get across legs of one of your main caps at center of board?

Thanks for responding.

I tried shining a flashlight on it but I'm not sure if it is bright enough or if I'm just doing it wrong. Anyway I didn't notice any image.

As far as testing the caps, are you referring to the 2 horizontal ones labeled 450v47uf? What DCV would I expect to see? I would just put the negative and positive leads each on one of the cap's legs? Sorry if that's a dumb question. I'm an amateur at this type of work.

[mmartell]

Re: Sharp Aquos LC-60LE640U Won't turn on

Press Menu and put the light right up to the screen where you would expect to see the menu and pull the light out some and move it around.

[StodgyWaif]

Re: Sharp Aquos LC-60LE640U Won't turn on

Okay I tried again with a brighter flashlight and pressing the menu button but I'm not seeing anything. The room where the TV is located is very bright so maybe that's interfering.

Also, I tested the 2 450v47uf caps (with the + and - leads on each leg) and they both showed 404v dc

[budwich]

Re: Sharp Aquos LC-60LE640U Won't turn on

disconnect one of the tcon to panel cables and see what the result is? Then do the same test with the other one.

[dskall]

Re: Sharp Aquos LC-60LE640U Won't turn on

Need voltages from connector that goes from power supply board to main board. Will need pin#- PIN DESCRIPTION -Pin voltage in standby-Pin voltage when pushing power button and picture of connector on power supply board.
Format:
Pin# - Pin Description - Pin Voltage standby - Pin voltage power on
1 - XXXXXXX - XXv - XXXv
2 - XXXXXXX - XXXv - XXXv
3 - XXXXXXX - XXXv - XXXv
4 - etc.

[StodgyWaif]

Re: Sharp Aquos LC-60LE640U Won't turn on

disconnect one of the tcon to panel cables and see what the result is? Then do the same test with the other one.

Powered on with only the right wide ribbon cable at the bottom of the tcon connected. No backlight. Power button operates normally once the green led on the mainboard starts to flash slowly.

Repeated with only the left ribbon cable. Same result.

Need voltages from connector that goes from power supply board to main board. Will need pin#- PIN DESCRIPTION -Pin voltage in standby-Pin voltage when pushing power button and picture of connector on power supply board.
Format:
Pin# - Pin Description - Pin Voltage standby - Pin voltage power on
1 - XXXXXXX - XXv - XXXv
2 - XXXXXXX - XXXv - XXXv
3 - XXXXXXX - XXXv - XXXv
4 - etc.

Not sure about testing the power supply to mainboard connector. There are 24 leads on this connector. The bottom ones look like they'll be very difficult to get to. Can this be done while the connector is disconnected?

Are these the relevant wires? Not sure why the bottom 3 aren't numbered.


Thanks again for the replies.

[StodgyWaif]

Re: Sharp Aquos LC-60LE640U Won't turn on

Need voltages from connector that goes from power supply board to main board. Will need pin#- PIN DESCRIPTION -Pin voltage in standby-Pin voltage when pushing power button and picture of connector on power supply board.
Format:
Pin# - Pin Description - Pin Voltage standby - Pin voltage power on
1 - XXXXXXX - XXv - XXXv
2 - XXXXXXX - XXXv - XXXv
3 - XXXXXXX - XXXv - XXXv
4 - etc.

Sorry, I just don't know all of the info requested.
I have included a picture of the order in which I tested the pins. I used a needle inserted into the back of each port on the connector and put the ground lead on one of the screws of the cold side of the power supply.

Pin# - Standby - Power On
01 - 11.97 - 11.98
02 - 00.00 - 00.00
03 - 13.05 - 13.07
04 - 13.05 - 13.08
05 - 00.00 - 00.00
06 - 00.00 - 00.00
07 - 02.84 - 02.84
08 - 03.28 - 03.29
09 - 03.28 - 01.45
10 - 03.28 - 01.45
11 - 00.00 - 00.00
12 - 03.26 - 00.00
13 - 11.99 - 11.98
14 - 00.00 - 00.00
15 - 13.05 - 13.07
16 - 13.05 - 13.08
17 - 00.00 - 00.00
18 - 00.00 - 00.00
19 - 03.29 - 03.29
20 - 05.02 - 05.03
21 - 00.00 - 00.00
22 - 00.57 - 00.00
23 - 00.86 - 01.45
24 - 00.00 - 00.00

[budm]

Re: Sharp Aquos LC-60LE640U Won't turn on

No pin names on the power supply board side as requested to tell us what those pins are?

[StodgyWaif]

Re: Sharp Aquos LC-60LE640U Won't turn on

No pin names on the power supply board side as requested to tell us what those pins are?

Sorry about that. Here is a picture of the printing on the PSU. I don't think these correlate to the order that I tested them in. If you can tell me how the pins are numbered on the connector I can correct my table of values.