Thursday, January 28, 2016

SHARP LC-42LE540U - LC-46LE540U - Service mode - Software update - service mode adjustments - Audio amplifier schematic diagram - LED Television Repair and service

Category: LED Television Repair and Service 

Contents of this article 

  • How to enter to service mode 
  • Software Update procedure 
  • Audio amplifier circuit 

SHARP LC-42LE540U - LC-46LE540U

Enter factory mode menu: press MENU + Numeric keys “3481” to enter factory mode.
You can press “LEFT” or “RETURN” key to back to normal main menu.
1. Connect to TV USB port to upgrade the software firmware
Please follow the following steps to upgrade the firmware.
A. Turn on TV.
B. Press Menu, select Setup > Version info to check "Version"
C. Copy the correct software firmware (*.pkg) to USB disk.
Ex: Version: NAS2_95N.pkg, copy NAS2_95N.pkg to USB disk.
D. Insert the USB disk to TV USB port.
E. TV AC power off -> AC power on
F. V. TV will upgrade by itself after detect the USB disk condition and the content of the pkg file.
Note: TV's LED will flash during upgrade process
G. After finish upgrade process, TV will reboot by itself.
H. Remove USB disk from TV.
I. Press Menu, select Setup> Version info.
J. Check the software version is correct or not.
Display adjustment
Only adjust HDMI Mode and copy to all of input source
General set-up:
Equipment Requirements: Minolta CA-210 or Equivalent Color analyzer or equivalent instrument.
Input Signal Type:
1. Internal full white pattern.
2. Select Picture mode to Standard mode and check the x, y data.
Input Injection Point: HDMI cable
Alignment method:
Initial Set-up:
1. Select source as “INPUT 1” (HDMI 1).
2. Set Picture mode as “Standard”.
3. Enter factory mode menu: press MENU + Numeric keys “3481” . Alignment:
1. Press “Menu” key enter factory mode page.
2. Set VideoÆWhite Pattern to “Medium”.
3. Enter VideoÆColor Temperature adjust.
Color temperature adjust:
1. Set color temperature to “Cool”
2. Adjust R Gain/G Gain values to meet “Cool” color coordinates.(Keep B Gain set “128”)
3. Adjust R Offset/G Offset values to meet “Cool” color coordinates.(Keep B Offset set “128”)
4. Repeat step 2, 3, 4 twice to meet “Cool” color coordinates specification below.
5. Set color temperature to “Warm”
”Standard” then Repeat 2,3,4 step adjusting.
6. Set color temperature “User” mode then set all values to “128”
Chromaticity Coordinate

0.272 ± 0.015
0.277 ± 0.015
0.285 ± 0.015
0.293 ± 0.015

0.313 ± 0.015
0.323 ± 0.015
Customer Color
Panel Native Color Temperature
Check the 16 grayscale pattern should be distinguished and color bar is correct Reset AV setting in OSD menu, picture mode shall be recalled to be “Standard” mode.
1. Use Minolta CA-210 for color coordinates and luminance check.
2. Before adjusting, all colour analyzers (CA-210) should be coordinates with a same reference TV set.
3. Luminance > =280 cd/m2 in the center of the screen when Brightness control at 100, Contrast control at 100, Backlight control at 100,Power Saving is off.(LC-42E540U& LC-46E540U)
AD82581B Digital Audio Amplifier
This is a stereo (8Ohms)/mono (4Ohms) fully digital audio amplifier with output power which can drive up to 2x12W for stereo or 1x24W for mono at 24V supply voltage, no external heat-sink or fan is requirement. Using I2C digital control interface, AD82581B provides input format selection, mute and volume control function. Protection circuits are provided to protect AD82581B damage while connection error.
1 N.C.
2 N.C.
3 PLL  - PLL enable, low active Schmitt trigger TTL input buffer
4 MCLK -  Master clock input Schmitt trigger TTL input buffer
5 CLK_OUT -  Clock output from PLL TTL output buffer
6 DGND - Digital Ground
7 N.C.
8 DVDD - Digital Power
9 DEF - Default volume setting Schmitt trigger TTL input buffer
10 N.C.
11 N.C.
12 SDATA - Serial audio data input Schmitt trigger TTL input buffer
13 N.C
14 MONO - MONO mode enable, high active Schmitt trigger TTL input buffer
15 LRCIN - Left/Right clock input (Fs) Schmitt trigger TTL input buffer
16 BCLK- Bit clock input (64Fs) Schmitt trigger TTL input buffer
17 PD - Power down, low active Schmitt trigger TTL input buffer