Panasonic TH-42LF6W User manual

© Panasonic Corporation 2013
Unauthorized copying and distribution is a violation
of law.
ORDER NO.ITD1311074CE
FULL HD LCD Display
Model No. TH-42LF6W
Model No. TH-42LF60W

2
TH-42LF6W_TH-42LF60W
TABLE OF CONTENTS
PAGE PAGE
1 Safety Precautions -----------------------------------------------3
1.1. General Guidelines ----------------------------------------3
1.2. Touch-Current Check -------------------------------------3
2 Warning --------------------------------------------------------------4
2.1. Prevention of Electrostatic Discharge (ESD)
to Electrostatically Sensitive (ES) Devices ----------4
3 Service Navigation------------------------------------------------5
3.1. Service Hint--------------------------------------------------5
3.2. Applicable signals ------------------------------------------6
4 Specifications ------------------------------------------------------8
5 Service Mode-------------------------------------------------------9
5.1. CAT (Computer Aided Test) mode ---------------------9
5.2. IIC mode structure (following items value is
sample data)----------------------------------------------- 14
6 Troubleshooting Guide---------------------------------------- 15
6.1. Self Check ------------------------------------------------- 15
6.2. No Power--------------------------------------------------- 20
6.3. No Display ------------------------------------------------- 21
6.4. Abnormal Display ---------------------------------------- 22
7 Disassembly and Assembly Instructions--------------- 23
7.1. PCB Layout ------------------------------------------------ 23
7.2. Preparation ------------------------------------------------ 23
7.3. About disassembly and replacement --------------- 23
7.4. Back Cover removal------------------------------------- 24
7.5. A-Board replacement------------------------------------ 25
7.6. P-Board replacement------------------------------------ 26
7.7. AC Inlet replacement ------------------------------------ 26
7.8. FR-Board and FR-Board Fixing Metal TOP/
BTM replacement ---------------------------------------- 27
7.9. GK-Board and Key Cover and Key Pad
replacement ----------------------------------------------- 27
7.10. Speaker and Stand bracket L/R replacement ----- 28
7.11. K-Board, LED Panel and LED Panel Case
replacement ----------------------------------------------- 29
7.12. Cabinet fixing Metal Top/Left/Right/Bottom
Left/Bottom Right replacement ----------------------- 30
7.13. LCD Panel replacement -------------------------------- 31
7.14. Caution about the sticking parts of LCD Panel --- 32
8 Block Diagram --------------------------------------------------- 34
8.1. Main Block Diagram ------------------------------------- 34
8.2. Power Board----------------------------------------------- 35
9 Wiring Connection Diagram--------------------------------- 36
9.1. Wiring Connection Diagram --------------------------- 36
10 Exploded View and Replacement Parts List----------- 37
10.1. Exploded View -------------------------------------------- 37
10.2. Replacement Parts List--------------------------------- 38

3
TH-42LF6W_TH-42LF60W
1 Safety Precautions
1.1. General Guidelines
1. When conducting repairs and servicing, do not attempt to modify the equipment, its parts or its materials.
2. When wiring units (with cables, flexible cables or lead wires) are supplied as repair parts and only one wire or some of the
wires have been broken or disconnected, do not attempt to repair or re-wire the units. Replace the entire wiring unit instead.
3. When conducting repairs and servicing, do not twist the Fasten connectors but plug them straight in or unplug them straight
out.
4. When servicing, observe the original lead dress. If a short circuit is found, replace all parts which have been overheated or
damaged by the short circuit.
5. After servicing, see to it that all the protective devices such as insulation barriers, insulation papers shields are properly
installed.
6. After servicing, make the following leakage current checks to prevent the customer from being exposed to shock hazards.
1.2. Touch-Current Check
1. Plug the AC cord directly into the AC outlet. Do not use an isolation transformer for this check.
2. Connect a measuring network for touch currents between each exposed metallic part on the set and a good earth ground
such as a water pipe, as shown in Figure 1.
3. Use Leakage Current Tester (Simpson 228 or equivalent) to measure the potential across the measuring network.
4. Check each exposed metallic part, and measure the voltage at each point.
5. Reserve the AC plug in the AC outlet and repeat each of the above measure.
6. The potential at any point (TOUCH CURRENT) expressed as voltage U1 and U2, does not exceed the following values:
For a. c.: U1 = 35 V (peak) and U2 = 0.35 V (peak);
For d. c.: U1 = 1.0 V,
Note:
The limit value of U2 = 0.35 V (peak) for a. c. and U1 = 1.0 V for d. c. correspond to the values 0.7 mA (peak) a. c. and 2.0
mA d. c.
The limit value U1 = 35 V (peak) for a. c. correspond to the value 70 mA (peak) a. c. for frequencies greater than 100 kHz.
7. In case a measurement is out of the limits specified, there is a possibility of a shock hazard, and the equipment should be
repaired and rechecked before it is returned to the customer.

4
TH-42LF6W_TH-42LF60W
2 Warning
2.1. Prevention of Electrostatic Discharge (ESD) to Electrostatically Sensi-
tive (ES) Devices
Some semiconductor (solid state) devices can be damaged easily by static electricity. Such components commonly are called Elec-
trostatically Sensitive (ES) Devices. Examples of typical ES devices are integrated circuits and some field-effect transistors and
semiconductor “chip” components. The following techniques should be used to help reduce the incidence of component damage
caused by electrostatic discharge (ESD).
1. Immediately before handling any semiconductor component or semiconductor-equipped assembly, drain off any ESD on your
body by touching a known earth ground. Alternatively, obtain and wear a commercially available discharging ESD wrist strap,
which should be removed for potential shock reasons prior to applying power to the unit under test.
2. After removing an electrical assembly equipped with ES devices, place the assembly on a conductive surface such as alumi-
num foil, to prevent electrostatic charge buildup or exposure of the assembly.
3. Use only a grounded-tip soldering iron to solder or unsolder ES devices.
4. Use only an anti-static solder removal device. Some solder removal devices not classified as “anti-static (ESD protected)” can
generate electrical charge sufficient to damage ES devices.
5. Do not use freon-propelled chemicals. These can generate electrical charges sufficient to damage ES devices.
6. Do not remove a replacement ES device from its protective package until immediately before you are ready to install it. (Most
replacement ES devices are packaged with leads electrically shorted together by conductive foam, aluminum foil or compara-
ble conductive material).
7. Immediately before removing the protective material from the leads of a replacement ES device, touch the protective material
to the chassis or circuit assembly into which the device will be installed.
Caution
Be sure no power is applied to the chassis or circuit, and observe all other safety precautions.
8. Minimize bodily motions when handling unpackaged replacement ES devices. (Otherwise ham less motion such as the brush-
ing together of your clothes fabric or the lifting of your foot from a carpeted floor can generate static electricity (ESD) sufficient
to damage an ES device).

5
TH-42LF6W_TH-42LF60W
3 Service Navigation
3.1. Service Hint

6
TH-42LF6W_TH-42LF60W
3.2. Applicable signals
*1 Not compatible with SYNC ON G.
• The signal format automatically detected may differ from the actual input signal in display.

7
TH-42LF6W_TH-42LF60W

8
TH-42LF6W_TH-42LF60W
4 Specifications

9
TH-42LF6W_TH-42LF60W
5 Service Mode
5.1. CAT (Computer Aided Test) mode
How to access the CAT mode.
Method A Main unit + remote control operation
Press and hold the button on the right side of the unit and press the RECALL button on the remote control 3 times quickly
within 2 second, this will place the unit into the CAT mode.
Method B Remote control operation only
1. Set the OFF timer except for [0] minute by OFF TIMER button. (30 minutes, 60minutes, 90 minutes)
2. Set the volume level of sound to 0 by VOL down button / -button.
3. Press the RECALL button more than 3 seconds before a volume display disappears.
To exit the CAT mode, turn the power off by the main unit or a remote control.
5.1.1. IIC mode
Select the IIC mode by Up/Down button on the remote control at the front page of CAT mode and then press the Action button on
the remote control.
Subject and item are mentioned on “IIC mode structure”.
To exit the IIC mode, press the R button on the remote control.

10
TH-42LF6W_TH-42LF60W
5.1.2. CD mode
Select the CD mode by Up/Down button on the remote control at the front page of CAT mode and then press the Mute button on
the remote control more than 3 seconds.
Memory data change
To exit the CD mode, press the R button on the remote control.
About the serial number display
As for the serial number of A-module for repair, a dummy value is displayed.
* By the set for which A-module was exchanged, a serial number is displayed as [-----].
About the history display of SOS for the power supply system
• This unit adds the history display (5 times) of power supply failure to the CD mode as PTCT.
• By the self check of a signal system, only one history is displayed (After a self check disappears). But PTCT displays 5 times of
histories (Abnormality of the latest 3 times, first time and second time after shipment) and after a self check does not disappear.
You can see a detailed history of power failure sometimes.
* About the display contents of PTCT
PTCT : The position of [05] is the first time after shipment.
PTCT : The position of [04] is the second time after shipment.
PTCT : The position of [03] is second from last time.
PTCT : The position of [02] is last time.
PTCT : The position of [01] is the latest.
In [Contents & Check point] of [6.1.2. Power LED Blinking timing chart], the two-digit following PTCT are displayed by a hexadeci-
mal number.
Blinking times Contents & Check point Display contents
ex.1 2 times PTCT 02 H 09 02
ex.2 9 times PTCT 09 H 09 09

11
TH-42LF6W_TH-42LF60W
5.1.3. SD mode
Select the SD mode by Up/Down button on the remote control at the front page of CAT mode and then press the Action button on
the remote control.
To exit the SD mode, press the R button on the remote control.
5.1.4. MS mode
Select the MS mode by Up/Down button on the remote control at the front page of CAT mode and then press the Mute button on
the remote control more than 3 seconds.
To exit the MS mode, press the R button on the remote control.
Caution:
Market Select should be set after exchange of A-Board.
Destination number
Number Model (Destination)
0 42/47/55LF6J (Japan)
1 42/47/55LF6U (North America)
3 42/47/55LF6W (Europe,Asia, Oceania, ME, Africa)

12
TH-42LF6W_TH-42LF60W
5.1.5. NW mode
Note :
To use the network function, set each "Network Setup" setting and make sure to set the "Control I/F Select" to "LAN" or
"RS232C".
Select the NW mode by Up/Down button on the remote control at the front page of CAT mode and then press the Action button
on the remote control.

13
TH-42LF6W_TH-42LF60W
To exit the NW mode, press the R button on the remote control.
5.1.6. ID mode
Select the ID mode by Up/Down button on the remote control at the front page of CAT mode and then press the Mute button on
the remote control more than 3 seconds.
To exit the ID mode, press the R button on the remote control.

14
TH-42LF6W_TH-42LF60W
5.2. IIC mode structure (following items value is sample data)

15
TH-42LF6W_TH-42LF60W
6 Troubleshooting Guide
6.1. Self Check
6.1.1. Display Indication
1. Self-check is used to automatically check the bus line controlled circuit of the LCD display.
2. To get into the Self-check mode, press the volume down button on the right side of the unit, at the same time pressing the
OFF-TIMER button on the remote control, and the screen will show.
Method A Self-check only (A shipment setup is not carried out).
Select the ID mode by Up/Down button on the remote control at the front page of CAT mode and then press the Mute button
on the remote control more than 3 seconds.
Method B Self-check+Shipment setup
Press and hold the button on the right side of the unit and press the OFF-TIMER button on the remote control.
If the IIC ports have been checked and found to be incorrect
Or not located then “ - - ” will appear in place of “ OK ”
“ 02 ” in the line of the “ PTCT ” means the number of blinks of the Power LED is 2. (Reference to 6.1.2)
“ H09 ” in the line of the “ PTCT ” is the error code.
To exit the CAT mode switch off the main power.
Note:
The line of the “ PTCT ” displays when you get into the Self-check mode for the first time only after the Power LED blinks.

16
TH-42LF6W_TH-42LF60W
6.1.2. Power LED Blinking timing chart
1. Subject
Information of LED Blinking timing chart.
2. Contents
When an abnormality has occurred to the unit, the protection circuit operates and resets to the stand by mode. At this time,
the defective block can be identified by the number of blinks of the Power LED on the front panel of the unit.
* Refer to 6.1.1 Display Indication

17
TH-42LF6W_TH-42LF60W
6.1.3. LCD Panel test mode
White Magenta Yellow Cyan Black
[How to display the test pattern]
[Display pattern]
The failure-diagnosis by LCD Panel test mode
To find the possible failure point where in LCD Panel or Printed Circuit Board when the
abnormal picture is displayed.
1. While pressing [VOLUME ( - )] button of the main unit, press [R] button of the
remote control three times within 2 seconds.
2. Test pattern is displayed and Power LED lights red and orange alternately.
How to Exit: Turn off the unit.
How to Exit: The unit automatically turns off after around 10 seconds.
1. Press [Recall] button of the remote control.
2. Press [R] button of the remote control.
3. Press [N] button of the remote control for over 3 seconds.
4. Test pattern is displayed and Power LED lights red and orange alternately.
It is unfixed from which color it starts.
(1) Main unit + remote control operation
(2) Remote control operation only
[Test pattern output image]
LCD Panel
A-BoardA-Board
LCD
IC T-CON
Test pattern
Output test pattern from A-Board
FR-Board
IC
Double-
speed
processing
Video signal processing
IP conversion
OSD synthesis
Test pattern
Input
switching

18
TH-42LF6W_TH-42LF60W
[Diagnostic flow chart]
Yes
It displays.
No
It is still abnormal.
Is a test pattern
displayed normally?
Failure of A-Board
Failure of A-Board
Failure of LCD Panel
(rarely failure of A-Board or FR-Board)
Failure of FR-Board
Failure of FR-Board
No
This is not an abnormality
of part
No
- The whole is not abnormal.
- It is not blinking.
Yes
It is abnormal.
Yes
It disappears.
No
It is still abnormal.
No
It is still abnormal.
Yes
It disappears.
Is a part abnormal
even in a test pattern?
If "FRAME CREATION" of
"PICTURE" in On-Screen
Menu is set to "OFF", does
symptom disappear?
Failure of A-Board or LCD Panel
(rarely failure of FR-Board)
Yes
It is abnormal.
Yes
It is blinking.
࡮Is the whole abnormal
even in a test pattern?
or
࡮A test pattern is not
displayed but is the state
of LED blink of red and
orange?
Yes
It is green lighting.
A test pattern is not
displayed but is the state
of LED green lighting?
Vertical line/
Vertical bar
Color
unevenness
Horizontal line/
Horizontal bar
Vertical line/
Vertical bar
An image is
not displayed.
LED blinking
An image is
not displayed.
LED lighting
Please refer to the next page for "FRAME CREATION".
Please refer to the next page for "FRAME CREATION".
If "FRAME CREATION" of
"PICTURE" in On-Screen
Menu is set to "OFF", does
symptom disappear?

19
TH-42LF6W_TH-42LF60W
[Reference: FRAME CREATION]
FRAME CREATION is the function to double the number of display segments of an image and
to show a fast moving scene more finely.
OFF :Please select "OFF", when an image is unnatural.
MIN
MIDDLE
MAX
-
The mode is memorized per input terminal.
-
Even if “NORMALIZE” is selected, the NORMAL setting will not be restored.
-
The picture and menu will disappear for a moment if you switch the mode to OFF, or
switch from OFF to another mode.
“PICTURE” menu screen
Setting procedure and Diagnosis when the failure-diagnosis
"FRAME CREATION" setting is a setting of intermediate frame generation when
carrying out double-speed processing (from 60 to 120 frames).
Even if it sets to "OFF", it is not a function which becomes uniform processing.
[1] Press [PICTURE] button of the remote control, and display "PICTURE" menu screen.
[2] Change the item of "FRAME CREATION" into "OFF".
Please check the symptoms when it is changed to "OFF".
When changing to "OFF", the normal screen is displayed: Failure of FR-Board
100
70
50
PICTURE
NORMAL
NORMALIZE
STANDARD
BRIGHTNESS
50
Colour
50
Tint
PICTURE MENU
PICTURE
BACKLIGHT
ADVANCED SETTINGS
COLOR TEMP NORMAL
SHARPNESS 50
FRAME CREATION MAX
FRAME CREATION MAX

20
TH-42LF6W_TH-42LF60W
6.2. No Power