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Panasonic
LCD TV
TC-26LX20
Panasonic TC-26LX20
56 pages
Manual
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K board (TC-22LR30, TC-26/32LX20)
The K board contains the TV ON/Off, Volume, and Channel select buttons, and an
additional S-Video and Composite video input connector and headphone jack. It
connects to the A board via connector K3.
Figure 10
11
15
17
Table of Contents
Main Page
Table of Contents
3
Objective
6
Features
7
LCD Technology
7
Dynamic Image Balancing
8
3D Y/C Separation
8
LCD High Definition TV Model Differences
9
Differences between Models
9
Circuit Board Layout
10
TC-22LR30 Circuit Boards
10
Circuit Board Interconnection
11
System Control Block
12
A Board (TC-22LR30)
14
H Board (TC-26/32LX20)
15
K Board (TC-22LR30, TC-26/32LX20)
16
A Board (TC-26/32LX20)
17
Power Supply
18
Power Supply (TC-22LR30)
18
P Board - Primary Power
19
AP Board - Secondary Power
20
Tuner / FIP Power Supply (AP Board)
21
Over Current Protection Shutdown Circuits
22
14-Volt Power down Detect Circuit
23
Over Voltage Protection _ AC Shutdown Latch Circuit
24
Power Supply (TC-26/32LX20)
25
P Board (TC-32LH, TC-26/32LX20) - Primary Power
25
Standby Power Supply
26
Primary Power Supply
26
Power Supply Operation (TC-32LH, TC-26/32LX20)
27
Power on Operation of the DC-To- DC Converter
27
Power off Operation of the DC-To-DC Converter
28
Protection of the DC-To-DC Converter
28
AP Board - Secondary Power Supply
30
Secondary Voltages
31
Video Circuit Explanation
32
A Board
32
DG Board
33
Video Signal Processing
33
Video Signal Processing
34
Low Voltage Differential Signaling
35
HDMI Signal Path
37
Self-Check Function for TV Section
38
Self-Check Access
38
Servicing the TV Portion
39
Service Adjustment Mode for TV
39
How to Exit Adjustment Mode
40
Servicing the DVD
41
Troubleshooting
42
Shutdown Problems
43
LED Flashes Three Times
43
LED Flashes Once Every 5 Seconds
44
LED Flashes Five Times
44
LED Flashes Eight Times
44
Unit Shuts down and the Power on LED Is off
44
SOS Shutdown Problem
44
Does Not Record Video to Disc
47
Does Not Record Audio to Disc
48
Primary Power Supply Check
49
Secondary Power Supply Check
50
Appendix
51
Backlighting
51
Inverter Power Supply
51
High Voltage Power Supply
52
Test and Measurement
53
Specifications
54
Combo Overall Specification
54
TV Portion
55
DVD Portion
56
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