Sharp LC-32LB261U, LC-42LB261U, LC-50LB261U Schematic
32″&42″&50″LCD TV Best Buy LC-32LB261U- LC-42LB261U- LC-50LB261U
Service
Service
Service
TABLE OF CONTENTS
Description Page Description Page
Table Of Contents.......……..............................………......1
Important Safety Notice.......................................……......2
Revision List…………………………………………………3
1. General Specification..............................………...........4
2. Operating Instructions…………………….……...….......5
3. Input/Output Specification…………....................…....6
4. Mechanical Instructions…………………….................9
5. Repair Flow Chart.……………………….…….…….....18
6. PCB Layout.………………..……………….....….........25
6.1 Main Board…………..……………...………...............25
6.2 Power Board……………..………….……….….......27
6.3 Key Board………………………..………………......33
6.4 IR Board…………………………..……………........33
SAFETY NOTICE
ANY PERSON ATTEMPTING TO SERVICE THIS CHASSIS MUST FAMILIARIZE HIMSELF WITH THE CHASSIS
7. Adjustment..............................................................34
7.1 ADC and W/B Adjustment………………..…….34
7.2 F/W upgrade……………………..……………........35
7.3 DDC upgrade…………………..……………........36
8. Block Diagram.…….................................................37
9. Schematic……………...…………..……..…………...39
9.1 Main Board…………………………………...….......39
9.2 Power Board…………….…………...…………......53
9.3 Key Board……………….……………………….......63
9.4 IR Board………………………………..….…….......64
10. LOCATION Waveform and Voltage…………..….65
11. Exploded View……………………………….….…...68
12. BOM List……………….……………………………77
AND BE AWARE OF THE NECESSARY SAFETY PRECAUTIONS TO BE USED WHEN SERVICING
ELECTRONIC EQUIPMENT CONTAINING HIGH VOLTAGES.
CAUTION: USE A SEPARATE ISOLATION TRANSFOMER FOR THIS UNIT WHEN SERVICING
1
32″&42″&50″LCD TV Best Buy LC-32LB261U- LC-42LB261U- LC-50LB261U
Important Safety Notice
Proper service and repair is important to the safe, reliable operation of all AOC Company Equipment. The service
procedures recommended by AOC and described in this service manual are effective methods of performing service
operations. Some of these service operations require the use of tools specially designed for the purpose. The
special tools should be used when and as recommended.
It is important to note that this manual contains various CAUTIONS and NOTICES which should be carefully read in
order to minimize the risk of personal injury to service personnel. The possibility exists that improper service
methods may damage the equipment. It is also important to understand that these CAUTIONS and NOTICES ARE
NOT EXHAUSTIVE. AOC could not possibly know, evaluate and advise the service trade of all conceivable ways in
which service might be done or of the possible hazardous consequences of each way. Consequently, AOC has not
undertaken any such broad evaluation. Accordingly, a servicer who uses a service procedure or tool which is not
recommended by AOC must first satisfy himself thoroughly that neither his safety nor the safe operation of the
equipment will be jeopardized by the service method selected.
Hereafter throughout this manual, AOC Company will be referred to as AOC.
WARNING
Use of substitute replacement parts, which do not have the same, specified safety characteristics, might create
shock, fire, or other hazards.
Under no circumstances should the original design be modified or altered without written permission from AOC.
AOC assumes no liability, express or implied, arising out of any unauthorized modification of design.
Servicer assumes all liability.
FOR PRODUCTS CONTAINING LASER:
DANGER-Invisible laser radiations when open AVOID DIRECT EXPOSURE TO BEAM.
CAUTION-Use of controls or adjustments or performance of procedures other than those specified herein may
result in hazardous radiation exposure.
CAUTION -The use of optical instruments with this product will increase eye hazard.
TO ENSURE THE CONTINUED RELIABILITY OF THIS PRODUCT, USE ONLY ORIGINAL MANUFACTURER'S
REPLACEMENT PARTS, WHICH ARE LISTED WITH THEIR PART NUMBERS IN THE PARTS LIST SECTION OF
THIS SERVICE MANUAL.
Take care during handling the LCD module with backlight unit
-Must mount the module using mounting holes arranged in four corners.
-Do not press on the panel, edge of the frame strongly or electric shock as this will result in damage to the screen.
-Do not scratch or press on the panel with any sharp objects, such as pencil or pen as this may result in damage to
the panel.
-Protect the module from the ESD as it may damage the electronic circuit (C-MOS).
-Make certain that treatment person’s body is grounded through wristband.
-Do not leave the module in high temperature and in areas of high humidity for a long time.
-Avoid contact with water as it may a short circuit within the module.
-If the surface of panel becomes dirty, please wipe it off with a soft material. (Cleaning with a dirty or rough cloth may
damage the panel.)
2
32″&42″&50″LCD TV Best Buy LC-32LB261U- LC-42LB261U- LC-50LB261U
Revision List
Version Release Date Revision Instructions Customer Model TPV Model
LC-32LB261U E32E41NKFMBSNNX
A00 May.30.2014 Initial Release
A01 Jun.13.2014 Add New Model LC-32LB261U E32E51NKFMBSNNX
A02 Jul. 22.2014 Add New Model
A03 Oct. 30.2014 Add New Model
LC-42LB261U E42E41NKFMBSNNX
LC-50LB261U E50E41NKFMBSNNX
LC-32LB261U E32E41NKFMBPNNX
LC-42LB261U E42E41NKFMBPNNX
LC-50LB261U E50E41NKFMBPNNX
E32E41NKFMBRNNX
LC-32LB261U
E32E51NKFMBRNNX
LC-42LB261U E42E41NKFMBRNNX
LC-50LB261U E50E41NKFMBRNNX
3
32″&42″&50″LCD TV Best Buy LC-32LB261U- LC-42LB261U- LC-50LB261U
1. General Specification
Please refer to user manual.
4
32″&42″&50″LCD TV Best Buy LC-32LB261U- LC-42LB261U- LC-50LB261U
2. Operating Instructions
Please refer to user manual.
5
32″&42″&50″LCD TV Best Buy LC-32LB261U- LC-42LB261U- LC-50LB261U
3. Input/output Specification
3.1 RGB Signal Input
15 - Pin Color Display Signal Cable
1 Red Video 9 VGA 5V
2 Green Video 10 Sync Ground
3 Blue Video 11 Uart RX
4 Uart TX 12 Serial Data for DDC
5 Ground 13 H-Sync.
6 Red Ground 14 V-Sync.
7 Green Ground 15 Serial Clock for DDC
8 Blue Ground
3.2 HDMI Digital connector pin assignments
3.3 USB
PIN Signal Assignment PIN Signal Assignment
1 TMDS Data2+ 2 TMDS Data2 Shield
3 TMDS Data2- 4 TMDS Data1+
5 TMDS Data1 Shield 6 TMDS Data17 TMDS Data0+ 8 TMDS Data0 Shield
9 TMDS Data0- 10 TMDS Clock+
11 TMDS Clock Shield 12 TMDS Clock13 CEC 14 NC
15 SCL 16 SDA
17 DDC/CEC Ground 18 +5V Power
19 Hot Plug Detect
PIN Signal Assignment PIN Signal Assignment
1 VCC 2 Data-
3 Data+ 4 GND
6
32″&42″&50″LCD TV Best Buy LC-32LB261U- LC-42LB261U- LC-50LB261U
3.4 AV Signal Performance
3.4.1 Video / Component Video Input
All tests must be performed under “video standard testing conditions” unless otherwise specified
3.4.2 AV (Composite Video Input)
Amplitude 1.0 V (p-p), negative sync.
Impedance 75 ohm terminated
3.4.3 Component (Y, Pb/Cb, Pr/Cr Input)
Component
Y signal amplitude 1.0Vpp (including sync)
Cr, (R-Y) / Cb, (B-Y)
Y = 0.299R + 0.587G + 0.114B
Video
System NTSC
System 480i, 480P, 720P, 1080i, 1080P
±0.35Vpp, 75 ohm
Signal amplitude
Impedance
(R-Y) = 0.701R + 0.587G + 0.114B
(B-Y) = 0.299R + 0.587G + 0.886B
75 ohm terminated
3.5 Compatible Mode Table
Analog RGB Input Signal Timing
Supported
Resolution
H×V
640×480
720×400
800×600
800×600
1024×768
1280×768
1280×720
1280×800
1280×800
1280×960
1280×1024
1440×900
1680×1050
1920×1080
H(KHZ) V(HZ) Standard EDID Assignment
31.5 60 VESA DMT
31.5 70 VESA DMT
37.9 60 VESA DMT
35.1 56 VESA
48.4 60 VESA DMT
47.4 60 VESA DMT
45 60 VESA DMT
49.7 60 VESA DMT
62.8 75 VESA DMT
60 60 VESA DMT
64 60 VESA DMT
55.9 60 VESA DMT
65.3 60 VESA DMT
67.5 60 CEA-861
Established Timings
Established Timings
Established Timings
Established Timings
Established Timings
Detailed Timing
Description 2
Standard Timing
Identification
Standard Timing
Identification
Standard Timing
Identification
Standard Timing
Identification
Standard Timing
Identification
Standard Timing
Identification
Standard Timing
Identification
Detailed Timing
Description 1
Panel Type
1366X768 1920X1080
YES YES
YES
YES
YES
YES
YES
YES
YES
YES
YES NOTE3
YES
YES 16:9
YES
YES 16:10
YES
YES
YES
YES 4:3
YES
YES
YES 5:4
YES
YES 16:10
NOTE1
YES
YES NOTE3
NO
NOTE2
16:10
Mandatory
16:10
Mandatory
7
32″&42″&50″LCD TV Best Buy LC-32LB261U- LC-42LB261U- LC-50LB261U
HDMI Input Signal Timing:
Supported
Resolution
H×V
640×480
720×400
800×600
800×600
1024×768
1280×768
1280×720
1280×800
1280×800
1280×960
1280×1024
1440×900
1680×1050
1920×1080
H(KHZ) V(HZ) Standard
31.5 60 VESA DMT
31.5 70 VESA DMT
37.9 60 VESA DMT
35.1 56 VESA
48.4 60 VESA DMT
47.4 60 VESA DMT
45 60 VESA DMT
49.7 60 VESA DMT
62.8 75 VESA DMT
60 60 VESA DMT
64 60 VESA DMT
55.9 60 VESA DMT
65.3 60 VESA DMT
67.5 60 CEA-861
EDID
Assignment
Established
Timings
Established
Timings
Established
Timings
Established
Timings
Established
Timings
Detailed Timing
Description 2
Standard Timing
Identification
Standard Timing
Identification
Standard Timing
Identification
Standard Timing
Identification
Standard Timing
Identification
Standard Timing
Identification
Standard Timing
Identification
Detailed Timing
Description 1
Panel Type
1366X768 1920X1080
YES
YES
YES
YES
YES
YES
YES
YES
YES
YES
YES
YES NOTE3
YES
YES 16:9
YES 16:10
YES
YES
YES
YES
YES 4:3
YES 5:4
YES
YES
YES 16:10
NOTE1
YES
YES
YES NOTE3
NOTE2
16:10
Mandatory
16:10
Mandatory
8
32″&42″&50″LCD TV Best Buy LC-32LB261U- LC-42LB261U- LC-50LB261U
4. Mechanical Instructions
LC-32LB261U
1. Remove the screw to remove the BASE.
2. Remove the screw to remove the REAR COVER.
9
32″&42″&50″LCD TV Best Buy LC-32LB261U- LC-42LB261U- LC-50LB261U
3. Remove the connectors and screws to remove MAIN BOARD, POWER BOARD, SPEAKERS, BKT_IO.
4. Remove the screw to remove BKT_STAND, KEYPAD, IR BOARD.
10
32″&42″&50″LCD TV Best Buy LC-32LB261U- LC-42LB261U- LC-50LB261U
5. Remove the screw to remove FFC CABLE, DECO.
6. PANEL.
11
32″&42″&50″LCD TV Best Buy LC-32LB261U- LC-42LB261U- LC-50LB261U
LC-42LB261U
1. Remove the screw to remove the BASE.
2. Remove the screw to remove the REAR COVER.
12
32″&42″&50″LCD TV Best Buy LC-32LB261U- LC-42LB261U- LC-50LB261U
3. Remove the connectors and screws to remove MAIN BOARD, POWER BOARD, SPEAKERS, BKT_IO.
4. Remove the screw to remove BKT_STAND, KEYPAD, IR BOARD.
13
32″&42″&50″LCD TV Best Buy LC-32LB261U- LC-42LB261U- LC-50LB261U
5. Remove the screw to remove FFC CABLE, DECO.
6. PANEL.
14
32″&42″&50″LCD TV Best Buy LC-32LB261U- LC-42LB261U- LC-50LB261U
LC-50LB261U
1. Remove the screw to remove the BASE.
2. Remove the screw to remove the REAR COVER.
15
32″&42″&50″LCD TV Best Buy LC-32LB261U- LC-42LB261U- LC-50LB261U
3. Remove the connectors and screws to remove MAIN BOARD, POWER BOARD, SPEAKERS, BKT_IO.
4. Remove the screw to remove BKT_STAND, KEYPAD, IR BOARD.
16
32″&42″&50″LCD TV Best Buy LC-32LB261U- LC-42LB261U- LC-50LB261U
5. Remove the screw to remove FFC CABLE, DECO.
6. PANEL.
17
32″&42″&50″LCD TV Best Buy LC-32LB261U- LC-42LB261U- LC-50LB261U
p
p
5. Repair Flow Chart
1. No power
No power (LED “Off”)
Check the AC input and
the
ower is “ON”?
Yes
Power board
out
ut=12V,5V?
Yes
Check the IR board and LED
Replace the IR board
No
Replace the main board
No
Power “On”
No
Replace the power board
18
32″&42″&50″LCD TV Best Buy LC-32LB261U- LC-42LB261U- LC-50LB261U
2. Can’t start
Can’t start（LED red）
No
Power board output＝12,19.5V?
Yes
Check the power key is under control?
No
Check the IR receiver is normal?
Yes
Yes
Replace the power board
Replace the key board
Replace the IR board
No
Replace the main board
No
Replace the Power board
19
32″&42″&50″LCD TV Best Buy LC-32LB261U- LC-42LB261U- LC-50LB261U
3. Abnormal display
Abnormal Display
No
Check the source
Yes
Enter factory mode to do
“EEPROM initial”&“Reset”
No
Reset the source
Check the main board
Yes
Check the LVDS cable
Yes
Check the panel
No
Replace the panel
No
Replace the main board
No
Replace the LVDS cable
20
32″&42″&50″LCD TV Best Buy LC-32LB261U- LC-42LB261U- LC-50LB261U
4. No display
No display (LED blue)
Check TV is under control and power
on/off by remote control and power key?
Yes
Check the LVDS cable
Yes
Yes
Check the backlight is
“On”?
No
Reinsert or replace the
LVDS cable
No
No
Check the B/L
signal is available?
Yes
Replace the main board
No
Replace main board
Panel Vcc = 12V?
Yes
Replace the Panel
No
Replace the main board
Power board output＝12V,19.5V?
No
Yes
Replace the Panel
Replace the power board
21
32″&42″&50″LCD TV Best Buy LC-32LB261U- LC-42LB261U- LC-50LB261U
5. Sound problem
No sound or sound abnormal
Check the audio source connection
and the TV system are correct?
Yes
Check the TV is muted, adjust the
volume or enter the menu to reset?
No
No
Reinsert the audio cable or
change the TV system
Enter factory mode to do “Reset”
No
Check the cable between the
speakers and main board is OK?
Yes
Check the speaker resistance value is in spec
(Remark: The value is marked on the speaker)?
Yes
Replace the cable
Replace the main board
No
No
Replace the speaker
22
32″&42″&50″LCD TV Best Buy LC-32LB261U- LC-42LB261U- LC-50LB261U
6. Remote control malfunction
Remote Control malfunction
Check the remote control battery is
not properly placed or no power?
No
Use the other remote controls
No
Whether the IR board is
abnormal?
No
Replace the main board
Yes
Replace the battery
Yes
Replace the remote control
Yes
Replace the IR board
23
32″&42″&50″LCD TV Best Buy LC-32LB261U- LC-42LB261U- LC-50LB261U
7. OSD is unstable or can’t work normally
OSD is unstable or can’t work normally
Key board connected properly?
Yes
Buttons are OK?
Yes
Key board is OK?
Yes
Enter factory mode to do “Reset”
No
No
No
No
Reconnect the key board
Replace the button function
Replace the key board
Replace the main board
24
32″&42″&50″LCD TV Best Buy LC-32LB261U- LC-42LB261U- LC-50LB261U
6. PCB Layout
6.1 Main Board
715G6840M0D000004
25
32″&42″&50″LCD TV Best Buy LC-32LB261U- LC-42LB261U- LC-50LB261U
26
32″&42″&50″LCD TV Best Buy LC-32LB261U- LC-42LB261U- LC-50LB261U
6.2 Power Board
715G6896P01000003H (32”)
27
32″&42″&50″LCD TV Best Buy LC-32LB261U- LC-42LB261U- LC-50LB261U
28
32″&42″&50″LCD TV Best Buy LC-32LB261U- LC-42LB261U- LC-50LB261U
29
32″&42″&50″LCD TV Best Buy LC-32LB261U- LC-42LB261U- LC-50LB261U
715G6335P01003003 (42” & 50”)
30
Loading...