Panasonic TX-20LA80F Manuel utilisateur

Service Manual

Colour LCD Television

TX-20LA80F

TX-20LA80FS

Specifications

Power Source: 220-240V AC, 50Hz

Power Consumption: 52W

Stand-by Power

Consumption: 1W

Aerial Impedance: 75Ωunbalanced, Coaxial Type

Receiving System: PAL-B/G/I, D/K,

SECAM B/G, D/K, L/L’

PAL-525/60 (AV only)

M.NTSC(AVonly)

NTSC(AVonly)

Receiving Channels:

VHF E2-E12 VHF H1-H2 (ITALY)

VHF A-H (ITALY) VHF R1-R2

VHF R3-R5 VHF R6-R12

UHF E21-E69 CATV (S01-S05)

CATV S1-S10 (M1-M10) CATV S11-S20 (U1-U10)

CATV S21-S41 (Hyperband)

Operating Conditions:

Temperature: 5°C ÷35°C

Humidity: 5% ÷90% RH (non-condensing)

Intermediate Frequency:

Video/Audio

Video 38,9MHz, 33,9MHz

Audio 33,4MHz (B/G), 33,16MHz (A2)

33,05MHz (NICAM B/G, D/K, L)

32,4MHz (D/K), 32,66MHz (CZ STEREO)

40,4MHz (L’), 39,75MHz (L’NICAM),

32,35MHz,32,9MHz (NICAM)

Colour 34,47MHz (PAL)

34,5MHz, 34,65MHz (SECAM)

38,3MHz, 38,15MHz (SECAM L’)

Terminals:

AV1 IN Video (21 pin) 1V p-p 75Ω

Audio (21 pin) 500mV rms 10kΩ

RGB (21 pin) 0,7V p-p 75ΩAV1

OUT Video (21 pin) 1V p-p 75Ω

Audio (21 pin) 500mV rms 1kΩ

AV2 IN S-Video IN Y: 1V p-p 75Ω

(4-pin) C:0,3V p-p 75Ω

Audio (RCAx2) 500mV rms 10kΩ

Video (RCAx1) 1V p-p 75Ω

AUDIO OUT Audio (RCAx2) 500mV rms 1kΩ

LCD screen: L5EDD5L00011

640 x 480 VGA, 4:3

Visible Diagonal 508mm

Audio Output: 2x3W RMS

8Ωimpedance

Headphones: 3,5mm, 8ΩImpedance

Accessories

supplied : Remote Control

2 x R6 (UM3) Batteries

Dimensions:

Height: Width: Depth:

Including TV stand 484mm 498mm 233mm

TV set only 443mm 498mm 98mm

Net weight: 7,5kg

Specifications are subject to change without notice.

Weights and dimensions shown are approximate.

ORDER No. PCZ0804036CE

GLP21L Chassis

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Contents

SAFETY PRECAUTIONS........................................... 3

GENERAL GUIDE LINES...................................... 3

TOUCH – CURRENT CHECK............................... 3

PREVENTION OF ELECTROSTATIC DISCHARGE

(ESD) TO ELECTROSTATICALLY SENSITIVE (ES)

DEVICES.................................................................... 4

ABOUT LEAD FREE SOLDER (PBF)......................... 5

SUGGESTED PB FREE SOLDER........................ 5

SERVICE HINTS ........................................................ 6

CHASSIS BOARD LAYOUT....................................... 7

SETTING INSPECTION.............................................. 7

SELF-CHECK ............................................................. 8

ADJUSTMENT METHOD............................................ 9

BLOCK DIAGRAMS.................................................. 10

PARTS LOCATION................................................... 13

REPLACEMENT PARTS LIST.................................. 14

SCHEMATIC DIAGRAMS......................................... 21

A-BOARD SCHEMATIC DIAGRAM .................... 22

P-BOARD SCHEMATIC DIAGRAM .................... 23

V-BOARD SCHEMATIC DIAGRAM .................... 24

CONDUCTOR VIEWS .............................................. 25

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Safety Precautions

General Guide Lines

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 touch current checks to prevent the customer from being exposed to shock hazards.

4. Always ensure panel TKP0E16001 is correctly replaced before returning to customer (see Fig.1).

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 Fig. 2.

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.

Fig. 2

Fig. 1

APPLIANCES

EXPOSED

METAL PARTS

Resistance values in ohms (Ω)

R0=500

RS=1500

CS=0.22

10k

0.022

COLD

WATER PIPE

(EARTH GROUND)

V: Voltmetr or oscilloscope

(r.m.s. or peak reading)

Measuring network for TOUCH CURRENTS

Input resistance: ≥ 1M

Input capacitance: ≤ 200pF

Frequency range: 15Hz to 1MHz and d.c.respectively

NOTE – Appropriate measures should be taken to obtain the correct value in case of non-sinusoidal waveforms

U2(V)

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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 build up 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 harmless 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).

There are special components used in this equipment which are important for safety.

These parts are marked by in schematic diagrams, exploded views and replacement parts list. It is essential that

these critical parts should be replaced with manufacturer’s specified parts to prevent shock, fire, or other hazards. Do

not modify the original design without permission of manufacturer.

IMPORTANT SAFETY NOTICE

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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

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 Fig.3)

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. (see Fig.4)

Fig.3

Fig.4

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Service Hints

How to remove the Pedestal assembly

Lay the main unit face down. (see Fig.5)

Remove the 4 fixing screws and the pedestal assembly. (see Fig.6)

How to remove the backcover

Remove the 10 fixing screws. (see Fig.7)

Fig.5

Fig.6

SCREWS

Fig.7

SCREWS

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Chassis Board Layout

Setting Inspection

Voltage Confirmation

Board Name Function

A-Board Main Board

A-Board Tuner

A-Board AV2 Terminal

Key Control Key Control

P-Board Mains Input, Power Switch

P-Board Power Supply

V-Board Remote Receiver, LED IR

A-BOARD

V-BOARD

P-BOARD

KEY CONTROL

Confirm the following voltages:

A board Normal mode

Test point Position Voltage Description

TP025 C888 5V±0,25V 5V

TP024 C891 8,2V±0,5V 8V

TP031 R874 30V±2V 30V

Standby mode

TP029 C868 +pin 3,3V±0,2V STBY3,3V

TP030 C864 +pin 1,8±0,15 STBY1,8V

TP025 C888 <2V 5V

P board

Normal mode

TP842 Q843 23,8V±1V 24V switched

TP840 Connector P2, pin12 9,8V±1 12V

TP3802 IC3802, pin1 15V±1V 15V

TP3800 IC3801, pin4 4,3V±0,3V REG2

TP3801 IC3801, pin21 4,5V±0,3v REG3

Standby mode

TP842 Q843 <10V 24V switched

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Self Check

Self-check is used to automatically check the bus lines and hexadecimal code of the TV set. To enter Self-Check mode, keep

pressing the STATUS button on the remote control and press the down (-/v) button on the TV set. To exit Self Check,

switch off the TV set at the power button.

E2CRC 9A

OPTION 1 0F

OPTION 2 00

OPTION 3 A0

OPTION 4 11

OPTION 5 00

OPTION 6 05

OPTION 7 DD

OPTION 8 D2

OPTION 9 00

OPTION 10 20

OPTION 11 11

OPTION 12 00

OPTION 13 08

CHECK AD

E2 O.K.

VCTP O.K.

TUN O.K.

Chassis 22

Model 01

Size 20

VCTP B3

Self Check Com

lete

Panasonic GLP21L

TX-20LA80F

TX-20LA80FS

Display Ref. No. Description P.C.B.

E2 IC1120 EAROM A-Board

VCTP IC1501 AUDIO VIDEO TEXT PROCESSOR A-Board

TUN TU001 TUNER A-Board

If the CCU

orts have been checked and found to be incorrect or not located then " - - " will a

ear in

lace of "O.K.".

TV V2.06

E2 V04

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Adjustment Method

How to enter Service 1

•Set the Bass to maximum position, set the Treble to minimum position then keep pressing the INDEX button on the

remote control and press the down button (-/v) on the TV set, this will place the TV set into the Service Mode 1.

Key Command

•Press the RED /GREEN buttons to step up / down through the functions.

•Press the YELLOW /BLUE buttons to alter the function values, to alter White Rasters use +/-buttons

•Press the OK button after each adjustment has been made to store the required values.

•To exit the Service Mode, press the "N" button.

Keep adjusting sequence: DVCO, Sub-Contrast, other items.

Item Setting indication

Note: All setting values are approximate Settings / Special features

Sub-Contrast Sub-Contrast

Receive a 80% white level Philips Pattern with correct

sound system (B/G, D/K) via aerial input. For Sub-

Contrast alignment press "Blue" button, wait until the

figure colour is changed from red to black colour.

Press the OK.

DVCO DVCO

Receive a 80% white level Philips Pattern via aerial

input. For DVCO alignment press "Blue" button, wait

until the figure colour is changed from red to black

colour. Press the OK.

Highlight

Lowlight For correct setting see White Balance Adjustment

Sub-Brightness Sub-Brightness

-5 Optimum setting.

White Balance Adjustment

Instrument

•Remote Control

•LCD WB meter (Minolta CA-210 or equivalent)

Condition

•Switch on the TV Set. Enter Service1. Step down to Highlight line and keep the aging time more than 20 minutes.

Procedure

•After aging time above set White Raster No.12 for Highlight and No.4 for Lowlight Press the OK button

to store.

•Put Minolta Sensor to the center of the LCD Panel with 25mm gap between Minolta Sensor and LCD Panel. Adjust "x"

and "y" values by changing Red and Blue values.

•Press OK button to store setting.

High 12 0410 0410 0410

Low 4 0064 0064 0064

High 12

Low 4

Item Value

x2850±150

Highlight y2940±150

x2860±150

Lowlight y2900±150

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Video & Stereo Audio Block Diagram

IC1501

TUNER

TU001

VIDEO OUT 21

SIF_OUT 11

AM 10 15,16

191

TUNER CVBS IN

SIF

JK3002

MONITOR OUT R

MONITOR OUT L

MONITOR OUT

AV1 21 PIN SCART

JK3000

L OUT

R OUT

R IN

L IN

B IN

G IN

R IN

CVBS IN

CVBS OUT

AV1 R OUT

9 AV1 R IN

24 AV1 L OUT

10 AV1 L IN

179 AV1 BLUE IN

AV1 GREEN IN

180 AV1 RED/C IN

181 AV1 CVBS IN

190 AV1 CVBS OUT

195

13 AV3 R IN

AV3 L IN

14 AV3 CVBS IN

182

188 AV3 Y IN

AV3 C IN

187

IC 251

AUDIO AMP.

SPK L

SPK R

A5 R

SPK OUT R

SPK OUT L -

SPKR R +

SPK OUT R -

SPK OUT L SPKR L + 4

IC 1120

EEPROM 1687 WR EN

VCT6753G

AUDIO VIDEO TEXT

PROCESSOR

A – BOARD

B BUS

G BUS

R BUS

TO LCD PANEL

129,130,131,

132,135,136

141,142,143,

144,145,146

153,154,155,

156,157,158 AV2

17-23

7-13

27-33

JK3600

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