Panasonic TC-L32C20P Service manual

ORDER NO. PBRAS1012061CE

Service Manual

LCD TV

TC-L32C20P

Chassis: LA01

• Design and specications are subject to change without notice. Mass and dimensions shown are approximate.

TC-L32C20P

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 Figure1.) ..................................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

4 Specications .......................................................................................7

5 Service Mode........................................................................................8

5.1. How to enter into Service Mode .......................................................8

5.1.1. Contents of adjustment mode........................................................8

5.1.2. How to exit .....................................................................................8

5.2. SRV-TOOL ........................................................................................9

5.2.1. How to access ...............................................................................9

5.2.2. Display of SOS History ..................................................................9

5.2.3. POWER ON TIME/COUNT ...........................................................9

5.2.4. Exit.................................................................................................9

5.3. Service Mode Adjustment .................................................................10

5.3.1. Self Check Mode ...........................................................................10

5.3.2. Hotel Mode Adjustment .................................................................10

5.3.3. Hotel Mode ....................................................................................10

6 Troubleshooting Guide .........................................................................11

6.1. Check of the IIC bus lines.................................................................11

6.1.1. How to access ...............................................................................11

6.1.2. Exit.................................................................................................11

6.1.3. Screen display ...............................................................................11

6.1.4. Check Point ...................................................................................11

6.2. Power LED Blinking timing chart ......................................................12

6.3. No Power ..........................................................................................12

7 Disassembly and Assembly Instructions ..............................................13

7.1. AC Cord Dressing .............................................................................13

7.2. AC Cord Installation ..........................................................................14

7.3. Control Panel Assembly & Clamper Installation ...............................15

7.4. Side AV Preparation & Installation ....................................................16

7.5. Speaker Preparation & Installation ...................................................17

7.6. LCD Panel Assembly Installation......................................................18

7.7. LED Panel Installation ......................................................................19

7.8. Felt Sticking at LVDS Wire ...............................................................20

7.9. LCD Bracket and MTG Installation ..................................................21

7.10. Pedestal Assembly .........................................................................22

8 Measurements and Adjustments ..........................................................24

8.1. Voltage chart of A-board ...................................................................24

8.2. Voltage chart of P-board ...................................................................24

9 Block Diagram ......................................................................................25

9.1. Main Block Diagram .........................................................................25

10 Wiring Connection Diagram................................................................26

11 Schematic Diagram ............................................................................27

11.1. Schematic Diagram Notes ..............................................................27

11.2. A Board ...........................................................................................28

11.2.1. A Board - Sheet : 002 (1 / 3) ........................................................28

11.2.4. A Board - Sheet : 010 (1 / 3) ........................................................31

11.2.7. A Board - Sheet : 011 (1 / 3) ........................................................34

11.2.10. A Board - Sheet : 012 (1 / 3) ......................................................37

11.2.13. A Board - Sheet : 020 (1 / 3) ......................................................40

11.2.16. A Board - Sheet : 031 (1 / 3) ......................................................43

11.2.19. A Board - Sheet : 033 (1 / 2) ......................................................46

11.2.21. A Board - Sheet : 040 (1 / 5) ......................................................48

11.2.26. A Board - Sheet : 050 (1 / 2) ......................................................53

11.2.28. A Board - Sheet : 060 (1 / 2) ......................................................55

11.2.30. A Board - Sheet : 061 (1 / 1) ......................................................57

11.2.31. A Board - Sheet : 090 (1 / 3) ......................................................58

11.2.34. A Board - Sheet : 201 (1 / 3) ......................................................61

11.2.37. A Board - Sheet : 300 (1 / 4) ......................................................64

11.2.41. A Board - Sheet : 700 (1 / 2) ......................................................68

11.2.43. A Board - Sheet : 701 (1 / 2) ......................................................70

11.3. K Board ...........................................................................................72

11.4. P Board ...........................................................................................74

11.5. V Board ...........................................................................................77

12 Printed Circuit Board ..........................................................................80

12.1. A-Board...........................................................................................80

12.2. A-Board...........................................................................................81

12.3. P-Board ..........................................................................................82

12.4. P-Board ..........................................................................................83

13 Exploded View and Replacement Parts List .......................................84

13.1. Exploded View and Mechanical Replacement Parts List ...............84

13.2. Electrical Replacement Parts List ...................................................84

13.2.1. Replacement Parts List Notes .....................................................84

13.2.2. Mechanical Parts Location ..........................................................85

13.2.3. Mechanical Replacement Parts List ............................................85

13.2.4. Assembled Boards.......................................................................85

13.2.5 Packing Exploded View 1 .............................................................86

13.2.6. Packing Exploded View 2 ............................................................87

13.2.7. Electrical Replacement Parts List ................................................88

TC-L32C20P

1 Safety Precautions

1.1. General Guidelines

1. 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.

2. After servicing, see to it that all the protective devices such as insulation barriers, insulation papers shields 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 unplug 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 use 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

TC-L32C20P

2 Warning

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 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 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).

TC-L32C20P

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 process 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 standard 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 solder 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)

Suggested Pb free solder

There are several kinds of Pb free solder available for purchase. This product uses Sn+Ag+Cu (tin, silver, copper) solder. However, Sn+Cu (tin, copper), Sn+Zn+Bi (tin, zinc, bismuth) solder can also be used.

TC-L32C20P

3 Service Navigation

3.1. Service Hint

Board Name Function

A Board AVSW, TUN, GENX, PEAKS-AVCEEP, TEMP TUN

V Board REMOTE, LED, LUMINUNCE SENSOR

K Board CONTROL BUTTON, POWER BUTTON

P BOARD POWER AC / DC

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 * *

640 × 400 @70 31.47 70.08 * 640 × 480 @60 31.47 59.94 * Macintosh13 inch (640 × 480) 35.00 66.67 * 640 × 480 @75 37.50 75.00 * 852 × 480 @60 31.47 59.94 * 800 × 600 @60 37.88 60.32 * 800 × 600 @75 46.88 75.00 * 800 × 600 @85 53.67 85.08 * Macintosh16 inch (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 inch (1,152 × 870) 68.68 75.06 * 1,280 × 768 @60 47.70 60.00 * 1,280 × 1,024 @60 63.98 60.02 * 1,366 × 768 @60 48.36 60.00 *

Note:

• Signals other than above may not be displayed properly.

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

, PR), HDMI and PC

TC-L32C20P

4 Specications

Alimentación

Promedio Condición en espera

Consumo

Aspecto

Tamaño visible de la pantalla

pantallasonido

Número de pixels Altavoz Salida de audio Auriculares

Señales de computadora

Sistema de recepción/Nombre de la banda

TC-L32C20P

110-220 V ~ 50/60 Hz

92 W 0,3 W 16:9

80 cm (diagonal)

698 mm (L) × 393 mm (A)

1.049.088 (1.366 (L) × 768 (A)

160 mm × 42 mm × 2 pçs, 8 Ω

20 W (10 W + 10 W), 10% THD

M3 (3,5 mm) mini jack estéreo ×1

VGA, SVGA, XGA

SXGA ..... (comprimido)

Frecuencia de lectura horizontal 31 - 69 kHz Frecuencia de lectura vertical 59 - 86 Hz

1. PAL-M

2. PAL-N

3. NTSC

Recepción de transmisión y reproducción en videocasete o DVD

Canales de recepción

(TV Nor mal)

Antena - Trasera Condiciones de operación

Entrada AUDIO L - R AV1

Entrada AUDIO L - R AV2

Entrada AUDIO L - R AV3

Salida AUDIO L - R Monitor

Terminales de conexión

Otros Entrada HDMI1/2/3

Dimensiones (L × A × P)

Peso

VIDEO COMPONENT

VIDEO

Entrada PC

Entrada de tarjeta

BANDA VHF BANDA UHF CATV

2-13 (NTSC M EUA) 14-69 (NTSC M EUA) 1-125 (EUA CATV)

VHF / UHF

Temperatura: 0°C - 40°C Humedad: 20% - 80% HR (sin condensación)

Tipo RCA PINO ×2 0,5 V[rms]

Tipo RCA PINO ×1 1,0 V[p-p] (75 Ω)

Y 1,0 V[p-p] (incluyendo sincronía) PB/CB, PR/CR ±0,35 V[p-p]

Tipo RCA PINO ×2 0,5 V[rms]

Tipo RCA PINO ×1 1,0 V[p-p] (75 Ω)

Tipo RCA PINO ×2 0,5 V[rms]

Tipo RCA PINO ×1 1,0 V[p-p] (75 Ω)

Tipo RCA PINO ×2 0,5 V[rms] (alta impedáncia)

Tipo RCA PINO ×1 1,0 V[p-p] (75 Ω) Conectores Tipo A • Este TV soporta la función “HDAVI Control 5”

HIGH-DENSITY D-SUB 15 PINOS

Entrada SD CARD ×1

798 mm × 551 mm × 217 mm (con pedestal) 798 mm × 511 mm × 93 mm (solamente TV)

10,5 kg (con pedestal) 9,5 kg (solamente TV)

R, G, B/0,7 V [p-p] (75 Ω) HD, VD/TTL Nível 2,0 - 5,0 V[p-p] (alta impedáncia)

( Nota )

• Proyecto y Especificaciones sujetados a alteraciones sin previo aviso. Peso y Dimensiones mostradas son aproximadas.

TC-L32C20P

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 times 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 Remark

ADJUST CONTRAST 000

COLOR 4C TINT 00 SUB-BRT 808 BACKLGT 22E B-Y-G 34 R-Y-A 00

WB-ADJ R-GAIN F7

G-GAIN FB B-GAIN DB R-CENT 82 G-CENT 80 B-CENT 86

OPTION Boot ROM Factory Preset.

STBY-SET 00 EMERGENCY ON CLK MODE 00

CLOCK 0E4 RM-SET 00 Fixed. SRV-TOOL 00 See next.

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.

TC-L32C20P

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.

TC-L32C20P

5.3. Service Mode Adjustment

1. Press the “RECALL” button on the remote control and press “ -” vol button on the LCD panel.

2. Press button number 1 on the remote control to select for Adjustment.

3. Self Check to Exit.

5.3.1. Self Check Mode

1. Press the “MENU” button (on the remote control) and the “DOWN” button on the LCD panel.

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

5.3.2. 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”, then press “EXIT” to come out.

5.3.3. Hotel Mode

Item Function Hotel Mode Select hotel mode ON/OFF Initial INPUT Select input signal modes.

Initial POS Select programme number.

Initial VOL level Adjust the volume when each time power is

Maximum VOL level

Button lock Select local key conditions.

Remote lock Select remote control key conditions.

Set the input, when each time power is switched on. Selection : OFF/Analogue TV/Digital TV/AV1/AV2/AV3/PC/ HDMI1/HDMI2/HDMI3

• Off: give priority to a last memory.

• Selectable input is depend on the model.

Selection : Off/0 to 100

• Off: give priority to a last memory.

switched on. Selection/Range : Off/0 to 100

• Off: give priority to a last memory.

Adjust maximum volume. Range : 0 to 100

Selection : Off/SETUP/MENU/All

• Off: altogether valid.

• SETUP: only F-key is invalid.

(Tuning guide (menu) can not be selected.)

• MENU: only F-key is invalid.

(only Volume/Mute can be selected.)

• ALL: altogether invalid.

Selection : Off/SETUP/MENU

• Off: altogether valid.

• SETUP: only Setup menu is invalid.

• MENU: Picture/Sound/Setup menu are invalid.

TC-L32C20P

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] button 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

6.1.4. Check Point

Confirm the following parts if NG was displayed.

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:

Blinking times Contents BOARD

1 Inverter_SOS P BOARD 2 SUB 1.8V_SOS A BOARD 3 SUB 1.2V_SOS A BOARD 4 POWER_SOS P/A BOARD 5 SUB 5V_SOS A BOARD

9 TCON_SOS A BOARD 10 SUB 3.3V_SENSE A BOARD 11 DCDC_SOS A BOARD 12 SOS A BOARD

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.)

TC-L32C20P

7 Disassembly and Assembly Instructions

7.1. AC Cord Dressing

TREATMENT AC CORD.

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 code is pushed into the bottom of the bracket.

TC-L32C20P

7.3. VESA Rail Installation

1. Stick the FELT.

2. Metal Support on the LCD PANEL. (insert positioning.

3. Fix them with SCREW.

→ )

7.4. VESA Metal Assembly

1. Put VESA METAL TOP AT L & R on the METAL SUPPOUT.

2. Fix them with SCREW.

TC-L32C20P

7.5. Control Panel Assembly

1. Stick the FELT to CONTROL BUTTON.

2. Wire connecting. (K1)

3. Assemble POWER BUTTON to the K-PRINT.

4. Assemble K-PRINT, CONTROL BUTTON, CONTROL PANEL BRACKET.

5. Fix them with SCREWS.

6. Stick the FELT to CONTROL PANEL BRACKET.

7.6. Side AV Assembly Installation

1. Put SIDE AV BRACKET ASSY ON LCD PANEL.

2. Fix them with screw.

TC-L32C20P

7.7. SP Installation

1. Fix SP RUBBER BUSH on SP UNIT.

2. Put SP BRACKET on the CABINET.

3. Fix them with SCREW.

4. Set the SPEAKER UNIT.

7.8. LCD Panel Installation

Put LCD PANEL on the CABINET.

TC-L32C20P

7.9. LED Panel Installation & Fitting

1. Fix LED PANEL on CABINET.

2. Insert an A10-V10 lead connector in V-Print.

3. Put V-PCB on LED PANEL.

4. Fix LED PANEL ass’y with SCREW.

5. Insert the CLAMPER and stick FELT at V10 wire.

7.10. LCD Mounting Installation 1

1. Put clamper on METAL BRACKET BOTTOM.

2. Put METAL BRACKET BOTTOM on the LCD PANEL.

3. Fix them with screw.

4. Wire dressing and lock CLAMPER.

TC-L32C20P

7.11. LCD Mounting Installation 2

1. Put BARRIER & METAL BRACKET TOP-L on the LCD PANEL.

2. Fix them with screw.

7.12. LCD Mounting Installation 3

1. Put METAL BRACKET-LCD-SIDE on the LCD PANEL.

2. Fix them with screw.

TC-L32C20P

7.13. Metal Bracket Installation

1. Put Metal Bracket Top R on the LCD PANEL.

2. Fix them with SCREW.

3. Insert the CLAMPER.

+ 58 hidden pages