Panasonic TC-L32C3 Service manual

ORDER NO. MTV1101002CE

Model No. TC-L32C3

Chassis: LA14

Destination: USA

LCD HDTV

TABLE OF CONTENTS

1 Safety Precautions----------------------------------------------- 3

1.1. General Guidelines---------------------------------------- 3

1.1.1. Leakage Current Cold Check----------------------3

1.1.2. Leakage Current Hot Check (See Figure

1.)--------------------------------------------------------- 3

2 Warning--------------------------------------------------------------4

2.1. Prevention of Electrostatic Discharge (ESD)
to Electrostatically Sensitive (ES) Devices---------- 4

2.2. About lead free solder (PbF)---------------------------- 5

3 Service Navigation----------------------------------------------- 6

3.1. Service Hint------------------------------------------------- 6

3.2. Applicable signals ----------------------------------------- 7

4 Specifications ----------------------------------------------------- 8
5 Service Mode ------------------------------------------------------ 9

5.1. How to enter into Service Mode ----------------------- 9

5.1.1. Contents of adjustment mode --------------------- 9

5.1.2. How to exit---------------------------------------------- 9

5.2. SRV-TOOL -------------------------------------------------10

5.2.1. How to access----------------------------------------10

PAGE PAGE

5.2.2. Display of SOS History ----------------------------10

5.2.3. POWER ON TIME/COUNT-----------------------10

5.2.4. Exit------------------------------------------------------10

5.2.5. Self Check Mode ------------------------------------ 11

5.2.6. Hotel Mode Adjustment---------------------------- 11

5.2.7. Hotel Mode-------------------------------------------- 11

6 Troubleshooting Guide ---------------------------------------12

6.1. Check of the IIC bus lines------------------------------12

6.1.1. How to access ---------------------------------------12

6.1.2. Exit------------------------------------------------------12

6.1.3. Screen display --------------------------------------- 12

6.2. Power LED Blinking timing chart---------------------13

6.3. No Power---------------------------------------------------13

7 Disassembly and Assembly Instructions---------------14

7.1. AC Cord Dressing----------------------------------------14

7.2. AC Cord Installation------------------------------------- 15

7.3. Control Panel Assembly-------------------------------- 16

7.4. Speaker Assembly--------------------------------------- 17

7.5. LCD Panel Assembly ----------------------------------- 18

© Panasonic Corporation 2011. Unauthorized
copying and distribution is a violation of law.

TC-L32C3

7.6. LCD Panel Fixing & Handling Method --------------19

7.7. LED Panel and Bracket Assembly ------------------20

7.8. Screw and Board Assembly---------------------------21

7.9. Inv-Lead & Clamper Assembly -----------------------22

7.10. Bracket Assembly----------------------------------------23

7.11. Disassembly P board and A board ------------------24

7.12. Back Cover Assembly 1--------------------------------25

7.13. Back Cover Assembly 2--------------------------------26

7.14. Disassembly Back Cover Assembly-----------------27

7.15. Pedestal Assembly 1------------------------------------28

7.16. Pedestal Assembly 2------------------------------------29

7.17. Stand Mounting Assembly-----------------------------30

8 Measurements and Adjustments --------------------------31

8.1. Voltage chart of A-board--------------------------------31

8.2. Voltage chart of P-board--------------------------------31

8.3. Picture level adjustment (RF) -------------------------31

9 Block Diagram ---------------------------------------------------32

9.1. Main Block Diagram-------------------------------------32

9.2. Detailed Block Diagram (1/2)--------------------------33

9.3. Detailed Block Diagram (2/2)--------------------------34

10 Wiring Connection Diagram---------------------------------35

10.1. Wire Dressing---------------------------------------------35

11 Schematic Diagram---------------------------------------------36

11.1. Schematic Diagram Notes-----------------------------36
1 1 .2. A-Board (1/10) Schematic Diagram -----------------37
1 1 .3. A-Board (2/10) Schematic Diagram -----------------38
1 1 .4. A-Board (3/10) Schematic Diagram -----------------39
1 1 .5. A-Board (4/10) Schematic Diagram -----------------40
1 1 .6. A-Board (5/10) Schematic Diagram -----------------41
1 1 .7. A-Board (6/10) Schematic Diagram -----------------42
1 1 .8. A-Board (7/10) Schematic Diagram -----------------43

1 1 .9. A-Board (8/10) Schematic Diagram -----------------44
1 1 .10. A-Board (9/10) Schematic Diagram -----------------45
1 1 .11. A-Board (10/10) Schematic Diagram ---------------46
1 1 .12. KA-Board Schematic Diagram------------------------47
1 1 .13. P-Board Schematic Diagram--------------------------48

12 Printed Circuit Board ------------------------------------------49

12.1. A-BOARD --------------------------------------------------49

12.2. KA-BOARD ------------------------------------------------51

12.3. P-BOARD --------------------------------------------------52

13 Exploded View and Replacement Parts List-----------54

13.1. Exploded View and Mechanical Replacement
Parts List ---------------------------------------------------54

13.2. Electrical Replacement Parts List--------------------54

13.2.1. Replacement Parts List Notes ------------------- 54

13.2.2. Electrical Replacement Parts List---------------55

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TC-L32C3

1 Safety Precautions

1.1. General Guidelines

1. When servicing, observe the original lead dress. If a short circuit is found, re place all parts which have been overheated or
damaged by the short circuit.

2. After servicing, see to it that all the protective devices such as insulation barriers, insulation papers shie lds are properly
installed.

3. After servicing, make the following leakage current checks to prevent the customer from being exposed to shock hazards.

4. When conducting repairs and servicing, do not attempt to modify the equipment, its parts or its materials.

5. 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.

6. When conducting repairs and servicing, do not twist the Faston connectors but plug them straight in or un plug them straight
out.

1.1.1. Leakage Current Cold Check

1. Unplug the AC cord and connect a jumper between the
two prongs on the plug.

2. Measure the resistance value, with an ohmmeter,
between the jumpered AC plug and each exposed
metallic cabinet part on the equipment such as
screwheads, connectors, control shafts, etc. When the
exposed metallic part has a return path to the chassis, the
reading should be 100 Mohm and over.
When the exposed metal does not have a return path to
the chassis, the reading must be .

1.1.2. Leakage Current Hot Check (See Figure 1.)

1. Plug the AC cord directly into the AC outlet. Do not us e
an isolation transformer for this check.

2. Connect a 1.5kohm, 10 watts resistor, in parallel with a

0.15μF capacitors, 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 an AC voltmeter, with 1000 ohms/volt or more
sensitivity, to measure the potential across the resistor.

4. Check each exposed metallic part, and measure the
voltage at each point.

5. Reverse the AC plug in the AC outlet and repeat each of
the above measurements.

6. The potential at any point should not exceed 0.75 volts
RMS. A leakage current tester (Simpson Model 229 or
equivalent) may be used to make the hot checks, leakage
current must not exceed 1/2 milliamp. In case a
measurement is outside 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.

Figure 1

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TC-L32C3

2Warning

2.1. Prevention of Electrostatic Discharge (ESD) to Electrostatically Sensitive (ES) Devices

Some semiconductor (solid state) devices can be damaged easily by static electricity. Such components commonly are called
Electrostatically 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 compon ent 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
aluminum 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
comparable 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
brushing 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).

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TC-L32C3

2.2. About lead free solder (PbF)

Note: Lead is listed as (Pb) in the periodic table of elements.
In the information below, Pb will refer to Lead solder, and PbF will refer to Lead Free Solder.
The Lead Free Solder used in our manufacturing proc ess and discussed below is (Sn+Ag+Cu).
That is Tin (Sn), Silver (Ag) and Copper (Cu) although other types are available.

This model uses Pb Free solder in it’s manufacture due to environmental conservation issues. For service and repair work, we’d
suggest the use of Pb free solder as well, although Pb solder may be used.

PCBs manufactured using lead free solder will have the PbF within a leaf Symbol PbF stamped on the back of PCB.

Caution

• Pb free solder has a higher melting point than st andard solder . Typically the melting point is 50 ~ 70 °F (30~40 °C) higher. Please
use a high temperature soldering iron and set it to 700 ± 20 °F (370 ± 10 °C).

• Pb free solder will tend to splash when heated too high (about 1100 °F or 600 °C).
If you must use Pb solder, please completely remove all of the Pb free solde r on the pins or solder area before applying Pb
solder. If this is not practical, be sure to heat the Pb free solder until it melts, before applying Pb solder.

• After applying PbF solder to double layered boards, please check the component side for excess solder which may flow onto the
opposite side. (see figure below)

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TC-L32C3

3 Service Navigation

3.1. Service Hint

Board Name Function

A BOARD Digital Signal Processor, Tuner

KA BOARD Remote Receiver, LED

K BOARD Power button, Control panel button and control panel bracket together.

P BOARD Power Supply

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TC-L32C3

3.2. Applicable signals

Input signal that can be displayed

* Mark: Applicable input signal for Component (Y, P

horizontal frequency (kHz) vertical frequency (Hz) COMPONENT HDMI PC
525 (480) / 60i 15.73 59.94 * *
525 (480) /60p 31.47 59.94 * *
750 (720) /60p 45.00 59.94 * *
1,125 (1,080) /60i 33.75 59.94 * *
1,125 (1,080)/60p 67.43 59.94 *
1,125 (1,080)/60p 67.50 60.00 *
1,125(1,080)/24p 26.97 23.98 *
1,125(1,080)/24p 27.00 24.00 *
640 × 400 @70 31.47 70.08 *
640 × 480 @60 31.47 59.94 *
Macintosh13” (640 × 480) 35.00 66.67 *
640 × 480 @75 37.50 75.00 *
852 × 480 @60 31.44 59.89 *
800 × 600 @60 37.88 60.32 *
800 × 600 @75 46.88 75.00 *
800 × 600 @85 53.67 85.08 *
Macintosh16” (832 × 624) 49.73 74.55 *
1,024 × 768 @60 48.36 60.00 *
1,024 × 768 @70 56.48 70.07 *
1,024 × 768 @75 60.02 75.03 *
1,024 × 768 @85 68.68 85.00 *
Macintosh 21” (1,152 × 870) 68.68 75.06 *
1,280 × 768 @60 47.78 59.87 *
1,280 × 1,024 @60 63.98 60.02 *
1,366 × 768 @60 48.39 60.04 *

Note:

• Signals other than above may not be displayed properly.

• The above signals are reformatted for optimal viewing on your display.

• Computer signals which can be input are those with a horizon tal scanning frequency of 15 to 110 kHz and vertical scanning
frequency of 48 to 120 Hz. (However, the image will not be displayed properly if the signals exceed 1,200 lines.)

, PR), HDMI and PC

B

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TC-L32C3

4 Specifications

Power Source AC 110-127 V, 60 Hz
Power Consumption

Rated Power Consumption 106 W
Standby condition 0.3 W

Display panel

Aspect Ratio 16:9
Visible screen size 32” class

(31.5 inches measured diagonally)

(W × H × Diagonal) 27.5” × 15.4” × 31.5”

(698 mm × 392 mm × 800 mm)

Number of pixels 1,049,088 (1,366 (W) × 768 (H)) [4,098 × 768 dots]

Sound

Speaker 1-way 2 bottom SP System
Audio Output 20 W [10 W + 10 W], (10% THD)

PC signals VGA, SVGA, XGA, WXGA, SXGA

Channel Capability-ATSC/NTSC (Digital/Analog) VHF/ UHF: 2 - 69, CATV: 1 - 135
Operating Conditions Temperature : 32°F - 95°F (0°C - 35°C)

Connection Terminals

VIDEO IN 1-2 VIDEO: RCA PIN Type × 1 1.0V [p-p] (75 Ω)

COMPONENT IN Y: 1.0 V [p-p] (including synchronization)

HDMI 1-2 TYPE A Connectors × 2

PC D-SUB 15 PIN: R, G, B / 0.7 V [p-p] (75 Ω)

Card slot SD Card slot × 1
DIGITAL AUDIO OUT PCM / Dolby Digital, Fiber Optic
FEATURES 3D Y/C FILTER, CLOSED CAPTION,

Dimensions (W x H x D)

Including TV Stand 30.7” × 21.0” × 8.2”

TV Set only 30.7” × 19.6” × 3.4”

Mass

Including TV stand 22.0lb. (10.0 kg) NET
TV Set only 20.0 lb. (9.0 kg) NET

Horizontal scanning frequency 31 - 69 kHz
Vertical scanning frequency 59 - 86 Hz

Humidity : 20 % - 80 % RH (non-condensing)

AUDIO L - R RCA PIN Type × 2 0.5V [rms]

P

, PR: ± 0.35 V [p-p]

B

AUDIO L - R: RCA PIN Type × 2 0.5 V [rms]

• This TV supports ‘HDAVI Control 5’ function.

HD, VD / 1.0-5.0 V [p-p] (high impedance)

V-chip, HDAVI Control 5
Vesa compatible, VIERA IMAGE VIEWER

779 mm × 531 mm × 207 mm

779 mm × 497 mm × 85 mm

Note

• Design and Specifications are subject to change without notice. Mass and Dimensions shown are approximate.

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TC-L32C3

5 Service Mode

5.1. How to enter into Service Mode

While pressing [VOLUME ( - )] button of the main unit, press [INFO] button of the remote control three time s within 2 seconds.

5.1.1. Contents of adjustment mode

• Value is shown as a hexadecimal number.

• Preset value differs depending on models.

• After entering the adjustment mode, take note of the value in each item before starting adjustment.

Main item Sub item Sample Data

ADJUST CONTRAST 000

COLOR 59
TINT FE
SUB-BRT 800
BACKLGT 20D
B-Y-G 40
R-Y-A 0
VCOM 189

WB-ADJ R-GAIN 75

G-GAIN 80
B-GAIN 65
R-CENT 80
G-CENT 80
B-CENT 9B

OPTION Boot ROM

STBY-SET 00
EMERGENCY ON
CLK MODE 00
CLOCK FC7
EDID-CLK HIGH

SRV-TOOL 00

5.1.2. How to exit

Switch off the power with the [POWER] button on the main unit or the [POWER] button on the remote control.

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TC-L32C3

5.2. SRV-TOOL

5.2.1. How to access

1. Select [SRV-TOOL] in Service Mode.

2. Press [OK] button on the remote control.

5.2.2. Display of SOS History

SOS History (Number of LED blinking ) indication.
From left side; Last SOS, before Last, three occurrence before, 2nd occurrence after shipment, 1st occurrence after shipment.
This indication except 2nd and 1st occurrence after shipment will be cleared by [Self-check indication and forced to factory
shipment setting].

5.2.3. POWER ON TIME/COUNT

Note : To display TIME/COUNT menu, highlight position, then press MUTE for 3sec.
Time : Cumulative power on time, indicated hour : minute by decimal
Count : Number of ON times by decimal
Note : This indication will not be cleared by either of the self-checks or any other command.

5.2.4. Exit

1. Disconnect the AC cord from wall outlet.

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TC-L32C3

5.2.5. Self Check Mode

1. Press the ‘MENU’ button (on the remote control) and the ‘VOL DOWN’ button on the LCD panel.

2. Press ON/OFF button on the panel to Exit.

5.2.6. Hotel Mode Adjustment

1. Press the ‘VOLUME DOWN’ button on the TV panel and simultaneously press the AV button on the remote control 3 times to
enter Hotel Mode.

2. Set Hotel mode ‘on/off’, then press ‘EXIT’ to come out.

5.2.7. Hotel Mode

1. Purpose
Restrict a function for hotels.

2. Access command to the Hotel mode setup menu.
In order to display the Hotel mode setup menu, please
enter the following command (within 2 second).
[TV] : Vol [Down] + [Remote] : INPUT (3 times).

Then, the Hotel mode setup menu is displayed.

3. To exit the Hotel mode setup menu
Disconnect AC power cord from wall outlet.

4. Explain the Hotel mode setup menu

Item Function
Mode Select hotel mode ON/OFF
Input Select input signal modes.

Set the input, when each time power is switched
on.
Selection :

-/RF/HDMI1/HDMI2/HDMI3/Component/
Video/PC

• Off: give priority to a last memory.

Channel Select channel when input signal is RF.

Set the channel, each time power is switched
on.
Selection :
Any channel number or [-].
[-] means the channel when turns off.

Volume Adjust the volume when each time power is

switched on.
Range :
0 to 100

Vol. Max Adjust maximum volume.

Range :
0 to 100

OSD Ctrl Restrict the OSD.

Selection :
OFF/PATTERN1

• OFF: No restriction

• PATTERN1: restriction

FP Ctrl Select front key conditions.

Selection :
OFF/PATTERN1/ALL

• OFF: altogether valid.

• PATTERN1: only input key is valid.

• ALL: altogether invalid.

Pow Ctrl Select POWER-ON/OFF condition when AC

power cord is disconnected and then connected.
OFF: The same condition when AC power
cord is disconnected.
ON: Forced power ON condition.

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TC-L32C3

6 Troubleshooting Guide

Use the self-check function to test the unit.

1. Checking the IIC bus lines

2. Power LED Blinking timing

6.1. Check of the IIC bus lines

6.1.1. How to access

Self-check indication only:
Produce TV reception screen, and while pressing [VOLUME ( - )] button on the main unit, press [OK] b utton on the remote control
for more than 3 seconds.
Self-check indication and forced to factory shipment setting:
Produce TV reception screen, and while pressing [VOLUME ( - )] button on the main unit, press [MENU] button on the remote
control for more than 3 seconds.

6.1.2. Exit

Disconnect the AC cord from wall outlet.

6.1.3. Screen display

12

6.2. Power LED Blinking timing chart

1. Subject
Information of LED Flashing timing chart.

2. Contents
When an abnormality occurs, the protection circuit will operate and reset the unit to stand by mode. During this time, the
defective block can be identified by the number of blinking times of the Power LED on the front panel of the unit as follow:

TC-L32C3

LCD

Times SOS

1 Inverter_SOS 0×002A TNPH0904/0905
2 SUB1.8V_SOS 0×0024 *For U series only
3 SUB1.2V_SOS 0×0025 *For U series only
4 POWER_SOS 0×0026 *miniLVDS model only

9ZWEI_SOS 0×002B *Double scan model only
10 SUB3.3V_SOS 0×0023
11 TCON_DCDC_SOS 0×0029 *miniLVDS model only
12 SOUND_SOS error of sound AMP 0×0028

Remark

6.3. No Power

First check point
There are following 2 states of No Power indication by power LED.

1. No lit

2. Red is lit then turns red blinking a few seconds later. (See 6.2.)

EEPROM ADR

address

PCB NAME

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TC-L32C3

7 Disassembly and Assembly Instructions

7.1. AC Cord Dressing

14

7.2. AC Cord Installation

1. Put on the AC CORD BRACKET on the CABINET.

2. Fix the AC CORD BRACKET with SCREW.

3. Insert AC CORD connector into P-PCB connector.

4. Clamp the AC CORD.

5. Insert AC CORD bushing into the AC CORD BRACKET.

6. AC CORD is pushed into the bottom of the bracket.

TC-L32C3

15

TC-L32C3

7.3. Control Panel Assembly

1. Fix K print_Power button_control panel button and control panel bracket together .

2. Fix 3 pcs screw.

16

7.4. Speaker Assembly

1. Fix SPONGE at SP UNIT.

2. Fix SP RUBBER BUSH at speaker unit.

3. Insert speaker to SP BRACKET.

4. Set speaker terminal direction follow spec.

TC-L32C3

17

TC-L32C3

7.5. LCD Panel Assembly

1. Put LVDS Hardness to LCD PANEL.

2. Put PET/AL-TAPE on LCD PANEL.

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7.6. LCD Panel Fixing & Handling Method

1. Place down the cabinet as shown below.

2. Fix LCD panel into the cabinet by taking below precautions.

TC-L32C3

Other general precautions

1. Do not press panel surface to avoid blue spot on the panel display.

2. Do not use hard cloth or rub the surface too hard. This may cause scratches on the surface.

3. Take care not to subject the TV’s surface to water or detergent. Any liquid (including pets urine) if enters the product could
lead to TV failure.

4. Take care not to subject the surface to insect repellent, solven t, thiner or other voilti le sub stances. This may degrade surface
quality or cause peeling of the paint.

5. The surface of the display panel is specially treated and may be easily damaged. Ta ke care not to tap or scratch with your
fingernail or other hard objects.

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TC-L32C3

7.7. LED Panel and Bracket Assembly

1. Fixing LED panel at cabinet and fix screw.

2. Stick clamper at cabinet.

Fixing Metal bracket, P bracket and Vesa Bracket.

20

7.8. Screw and Board Assembly

Fixing screw at bracket and panel follow spec.

TC-L32C3

Fix P-Print and A-Print board to panel.

21