Sharp LC-22DV510K

Sharp LC-22DV510K

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82

LC-22DV510

LC-24DV510

26.5. Keypad Touchpad Problems

Problem: Keypad or Touchpad is not working

Check keypad supply and KEYBOARD pin on MB60.

26.5 Keypad Touchpad Problems

Table of Contents

Default Chapter2
- Table of Contents2
- Electrical Specifications5
- Specifications5
- Safety Notice7
- Important Service Safety Precaution7
- End of Life Disposal9
- Operation Manual10
- Dimensions16
- Dimensional Drawings17
1 Introduction18
- General Block Diagram19
- MB60 Placement of Blocks20
2 Tuner(Tu102)21
- Circuit Descriptions21
- Features of DTOS403LH122X22
- General Description of Samsung DTOS403LH122X22
- Pinning23
3 SAW FILTER - Audio - Epcos K9656M(Z101)24
- Standard24
- Features24
- Pin Configuration24
- Frequency Response25
4 SAW FILTER - Video - Epcos K3958M(Z102)26
- Standard26
- Features26
- Pin Configuration26
- Frequency Response27
5 Audio Amplifier Stage with Azad2102(U163, U164)28
- General Description28
- Features28
- Absolute Ratings29
- Electrical Characteristics29
- Operating Specifications30
- Pinning31
6 Audio Amplifier Stage with Tpa3113(U168)32
- General Description32
- Features32
- Absolute Ratings32
- Electrical Characteristics32
- Operating Specifications33
- Pinning33
7 Power Stage34
- Short CCT Protection Circuit36
- Power Management39
8 Microcontroller - Mstar(U157)39
- General Description39
- General Features39
- MSTAR Block Diagram44
- Reset Circuit44
101 CI Interface45
- Block Diagram45
- CI Interface Power Switch45
10 Usb Interface46
11 Ddr2 Sdram 8M × 4 Banks × 16 Bit (W9751G6Jb) (U154, U155)47
- General Description47
- Features47
- Electrical Characteristics47
- Pinning48
12 Scaler and Lvds Sockets50
- LVDS Sockets Block Diagram50
- Panel Supply Switch Circuit50
13 Nand Flash Memory - Mx25L1005 (U158)52
- General Description52
- Features52
- Absolute Maximum Ratings52
- Pinning52
14 Nand Flash Memory - Nand512Xxa2C (U162)53
- General Description53
- Features53
- Pinning54
15 USB2.0 to Fast Ethernet - ASIX AX88X72A (U171)55
- General Description55
- Features55
- Block Diagram56
- Pinning56
16 Lm1117(U175, U180, U181)57
- General Description57
- Features57
- Applications57
- Absolute Maximum Ratings57
- Pinning57
17 Mp2012 (U176)58
- General Description58
- Features58
- Pinning58
18 Rta8283A (U23, U173)59
- General Description59
- Features59
- Pinning60
19 Mp1583 (U174)61
- General Description61
- Features61
- Pinning61
20 Fdc64262
- General Description62
- Features62
- Pinning62
21 Fdc604P63
- General Description63
- Features63
- Pinning63
22 Connectors64
- Scart (Sc1)64
- Hdmi (Cn707,Cn708)64
- Vga (Cn132)65
23 Service Menu Settings66
- Video Settings67
- Audio Settings67
- Options68
- Tuning Settings69
- Source Settings69
- Diagnostic70
- USB Operations70
24 Software Update71
25 Introduction for DVD Option72
26 Troubleshooting77
- No Backlight Problem77
- CI Module Problem79
- Led Blinking Problem80
- IR Problem81
- Keypad Touchpad Problems82
- USB Problems83
- No Sound Problem84
- No Sound Problem at Headphone84
- Standby On/Off Problem84
- DVD Problems85
- No Signal Problem85
27 Overall Wiring Diagram87
28 Schematic Diagrams89
29 Printed Wiring Board100
30 Replacement Parts Listing101
31 Cabinet and Mechanical Parts Listing119
- Sharp Corporation124

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