Panasonic TC-26LX60, TC-32LX60 Service manual

TC-26LX60 TC-32LX60

LH58

MTNC060371CE

B05 Canada: B07

LCD TV

CONTENTS

Page Page

1 Safety precautions 3

2 Warning

2.1. Prevention of Electro Static Discharge (ESD) to

Electrostatically Sensitive (ES) Devices

3 About lead free solder (PbF)

4 Receiver feature table

5 Chassis Board Layout

6 Location of controls (EUR7613ZG0)

7 Service Mode

7.1. How to enter into adjustment mode

7.2. Adjustment method.....Use the remote control.

7.3. Cancellation

7.4. Contents of adjustment mode

8 Troubleshooting Guide

8.1. Self-check function

8.2. How to access

8.3. Screen Display

9 Disassembly Instructions 9

9.1. Removing the LCD panel assembly and LCD L/R MTG

9.2. Removing the LCD panel and LCD T/B MTG

10 Measurements and Adjustments

10.1. White Balance Adjustment

11 Boards Assemblies

11.1. AP-Board

11.2. A-Board

11.3. P-Board

11.4. G-Board

11.5. DT-Board

11.6. DT-Board with shield

11.7. V-Board

12 Block Diagram

12.1. Block Diagram for K, P and AP (DC-DC CONV.) (1 of 2)

12.2. Block Diagram for K, P and AP (DC-DC CONV.) (2of 2)

12.3. ATSC Interface Block Diagram (1 of 2) 23

12.4. ATSC Interface Block Diagram (2 of 2)

12.5. Main Block Diagram (1 of 6)

12.6. Main Block Diagram (2 of 6)

12.7. Main Block Diagram (3 of 6)

12.8. Main Block Diagram (4 of 6)

12.9. Main Block Diagram (5 of 6)

12.10. Main Block Diagram (6 of 6)

13 Schematic Diagrams

13.1. Schematic Diagrams Notes

13.2. Reference of PDF links color

13.3. AP-Board (1 of 4) Schematic Diagram

13.4. AP-Board (2 of 4) Schematic Diagram

13.5. AP-Board (3 of 4) Schematic Diagram

13.6. AP-Board (4 of 4) Schematic Diagram

13.7. V-Board Schematic Diagram

13.8. G-Board Schematic Diagram

14 Printed Circuit Boards

14.1. A-Board Top Side

14.2. A-Board Bottom Side

14.3. AP-Board

14.4. DT-Board Bottom Side

14.5. DT-Board Top Side

14.6. V & G-Board

15 Parts Location

15.1. Packing Exploded View

16 Parts list

16.1. Description of abbreviations guide

16.2. Partslist

1 Safety precautions

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.

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 between 1MΩ and 5.2MΩ. When

the exposed metal does not have a return path to the chassis, the reading must be infinite.

Figure 1. Hot check circuit

Leakage current hot check

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

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

0.15F 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 0.5 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.

2 Warning

2.1. Prevention of Electro Static 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 fieldeffect transistors and semiconductor "chip" components. The following techniques should be used to help reduce the incidence of component damage caused by electro static 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 alminum 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, alminum 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 hamless 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).

3 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 manufacturin g 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” or a leaf symbol

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.

stamped on the back of PCB.

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.

4 Receiver feature table

FEATURE / MODEL TC-26LX60 TC-32LX60 LCD TYPE IPS (WXG A) LCD PANEL MAKER LG CHASSIS LH58 SYSTEM ATSC TUNING FST STEREO MTS/SAP CATV USA CATV 181CH POWER SUPPLY AC120, 60HZ AV-IN 3 (RCA) S-VHS-IN 2 COMPONENT VIDEO-IN VIDEO 1 / AUDIO 1 (RCA) AV-OUT 1 (RCA) HDMI 2 (AUDIO 2 IS COMMON VIDEO 2) DVI NONE PC-INPUT NONE HEAD PHONE X OPT DIGITAL AUDIO X PEAKS SYSTEM PEAKS LITE GC SYSTEM MICRONAS VCTP PROGRESSIVE X 3D Y/CCOMB FILTER X AUDIO OUTPUT 10W + 10W SPEAKER SYSTEM UNDER/1 WAY - SPEAKER BASS/TREBLE X BALANCE X SURROUND X AUDIO OUT PERFORMANCE FAO SAFETY-STANDARD UL6500/CUL STANDARD-ORGANIZATION E-STAR EMC (EMISSION) FCC-B/BETS-7 MECHANICAL ISTA ASPECT X OFF TIMER X AUTO SEARCH X DEMOSTRATION MODE X CLOSED CAPTION X V-CHIP X VESA COMPATIBLE OSD LANGUAGE ENGLISH (US) / FRENCH / SPANISH REMOTE CONTROLLER EUR7613ZG0 CEC OF HDMI CONNECTION DIGA PEDESTAL SWIVEL ONLY (NO TILTED) SD SLOT FOR DL BACK SIDE

Note:

Specifications are subject to change without notice or obligation.

5 Chassis Board Layout

Board Layout

Board Name TC-26LX60 TC-32LX60 Function A-Board TZRXN010MZK TZRXN010MYK Main (AV Switch, Audio, MCU, Global Core, AV connector) AP-Board TZRXN020MYK DC-DC DT-Board TNAG169S Digital Tuner G-Board TNPA3784S Front Terminal V-Board TNPA3749ACS Remote Reciever, LED P-Board N0AB3GJ00010 AC-DC

6 Location of controls (EUR7613ZG0)

7 Service Mode

8 Troubleshooting Guide

7.1. How to enter into adjustment mode

While pressing [VOLUME-] button of the main unit, press [RECALL] button of the remote control transmitter three times in a row (within 2 seconds).

7.2. Adjustment method.....Use the

remote control.

“1” button...Main items Selection in forward direction “2” button...Main items Selection in reverse direction “3” button...Sub items Selection in forward direction “4” button...Sub items Selection in reverse direction

7.3. Cancellation

8.1. Self-check function

When phenomena like "the power fails from time to time" or "the video/audio fails from time to time" can not be confirmed at the time of servicing, the self-check function can be used to confirm the occurrence and to limit the scope for the defective circuits. Also, when "the power fails from time to time", display on the screen can be used to confirm the occurrence and to limit the scope for the defective circuits.

Any programmed channels, channels caption data and some other user defined settings will be erased and return to factory setting.

8.2. How to access

Access

Produce TV reception screen and, while pressing [VOLUME -] button on the main unit, press [SLEEP] button on the remote controller unit simultaneously.

Exit

Press the POWER button twice (off/on) to return to the normal screen.

8.3. Screen Display

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

7.4. 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 Remarks

PCT-ADJ COLOR Sub color

R-Y-A R-Y recovery axis (R-Y) R-Y-G B-Y Gain (B-Y) BACK-L Sub backlight TINT Tint Adjustment

WB-ADT B-CENT Adjustment of Blue gain by test

G-CENT Adjustment of Green gain by test

R-CENT Adjustment of Red gain by test

B-GAIN Adjustment of Blue gain by test

G-GAIN Adjustment of Green gain by test

R-GAIN Adjustment of Red gain by test

OPTION OPTDD White 100% (Not ADJ)

BOOT Red 100% (Not ADJ)

STB-CAS

pattern (50% white)

pattern (100% white)

9 Disassembly Instructions

Back cover removal (screw location)

P-Board Disassembly

1. Remove all the screw from the back cover indicated with arrows.

Without the back cover

1. First remove the two screws from each bracket one located on top and one on the bottom.

1. To remove the P-Board remove the screws indicated on the figure above by arrows.

AP-Board Disassembly

1. To remove the AP-Board first lift the four connectors then remove the screws indicated on the figure above by arrows.

Bracket Disassembly

1. To remove the bracket shown above remove the screws indicated on the figure above by arrow.

DT-Board Disassembly

1. To remove the DT-Board shown above remove the screws indicated on the figure by arrows.

DT-Board Bracket Disassembly

1. To remove the A-Board bracket shown above remove the screws indicated on the figure above by arrows.

G-Board Disassembly

1. To remove the G-Board shown above remove the screw indicated on the figure by arrow.

Speaker Disassembly

1. To remove the DT-Board bracket shown above remove the screws indicated on the figure above by arrows.

A-Board Disassembly

1. To remove the speaker remove the screws indicated on the figure by arrows, each speaker is located on sides.

V-Board Disassembly

1. To remove the V-Board remove the screws indicated on the figure by arrows.

Removing the pedestal

1. Lay down the unit so that the rear cover faces upward.

2. Remove the 4 screws.

3. Then remove the pedestal.

9.1. Removing the LCD panel assembly and LCD L/R MTG

1. Remove the 4 screws.

2. Remove the LCD panel ass’y and LCD L/R MTG.

9.2. Removing the LCD panel and LCD T/B MTG

1. Remove the 4 screws.

2. Remove the LCD panel and LCD T/B MTG.

10 Measurements and

Adjustments

10.1. White Balance Adjustment

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