MANUFACTURER: SHARP
 
PART NUMBER: DKEYMF452FM11
 
ALSO KNOWN AS:
KF452
XF452WJZZ
 
TYPE: Main Board
 
KNOWN MODELS:
SHARP LC-46LE810UN
SHARP LC-52LE810UN
SHARP LC-60LE810UN
SHARP LC-70LE640U
SHARP LC-60LE820UN 

This mainboard is confirmed to be tested and working. This was obtained from a unit with led strip (backlight ) issue. Displayed can be seen when shining a light against the screen and there was audio. 
You may encounter one fast and one slow blink which means you need to reset the lamp error. It doesn't mean the board is faulty or you may have backlight issue as well. 

Here are the procedures to reset the lamp error

1) Turn the TV on. You may see one fast and one slow blinks.

2) Press and HOLD CH UP, VOL DOWN and POWER. 

3. Wait until the front led indicator to stop blinking, then release
4. The tv should now power up. Proceed to clear the lamp error and do industry init

Here are the procedures to clear the lamp error

Entering and exiting the adjustment process mode

1) Before entering the adjustment process mode, the AV position RESET in the video adjustment menu.

2) At the state TV is turned on, touch the power key for 5seconds.

NOTE: Picture will disappear when you touch the power key, but keep touching the power key.

3) When the center icon LED blinks, release your finger from the power key.

4) Next, touch the power key with “VOL (-)” and “INPUT” keys at the same time.

TV will turn on and the letter “<K>” appears on the screen.

5) Next, touch the “VOL (—)” and “CH ( )” keys at the same time.

6) When the center icon LED turns on, release your finger form the keys.

(The “VOL (—)” and “CH ( )” keys should be pressed and held until the display appears.)

Multiple lines of blue characters appearing on the display indicate that the unit is now in the adjustment process mode.

When you fail to enter the adjustment process mode (the display is the same as normal startup), retry the procedure.

7) To exit the adjustment process mode after the adjustment is done, unplug the AC cord from the outlet to make a forced shutdown. (When the

power was turned off with the remote controller, once unplug the AC cord and plug it again. In this case, wait 10 seconds or so before plugging.)

CAUTION: Use due care in handling the information described here lest your users should know how to enter the adjustment process mode. If the

settings are tampered in this mode, unrecoverable system damage may result.

WE ASSUME THAT YOU KNOW AND VERIFIED THE PROBLEM IS WITH THE MAINBOARD AND NOT WITH THE POWER BOARD, TCON 

OR BACKLIGHT.  MISSING AC_DET SIGNAL IS A COMMON PROBLEM WITH THIS MODEL. IF YOU'RE ABLE TO SEE A DISPLAY WHEN YOU SHINE A LIGHT ON THE SCREEN,
YOU HAVE A BACKLIGHT OR LED STRIP ISSUE. IF YOUR 5 BLINKS, YOU HAVE A TCON OR MISSING PANEL POWER ISSUE.