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Panasonic TH-42PA20U-P Service Manual
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Panasonic TH-42PA20U-P Service Manual

Panasonic TH-42PA20U-P Service Manual

Gp6du chassis progressive plasma television
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Specifications
Power Source
Power Consumption
Plasma Display panel
Screen Size
Dimensions
(W × H × D )
Mass (Weight)
Channel Capability-181
Sound
Speaker
Audio Output
Headphone
FEATURES
Accessories Supplied
Operating Conditions
Connection Terminals
AC 120 V, 50/60 Hz
Maximum :425 W
Stand-by condition :0.8 W
Drive method :AC type 42-inch, 16 :9 aspect ratio
36.22 " (920 mm) (W) × 20.39 " (518 mm) (H) × 41.57 " (1056 mm) (diagonal)
46.06 " (1170mm) " 29.91 " (658 mm) × 3.90 " (99 mm)
77.2 lb.(35.0 kg)Net
VHF-12 :UHF-56 :Cable-125
Woofer
1.57 " (40 mm) × 4 , Tweeter
16 W [ 8 W +8 W ] (10 % THD )
M3 (3.5 mm) Jack × 1
Two screen display fuctions
BBE VIVA
CLOSED CAPTION
Remote control Transmitter
AA Battery × 2
AC Cord
Pedestal
Temperature : 34 °F - 104 °F (0° - 40°C)
Humidity : 20 % - 80 % (non-condensing)
RGB input
AV INPUT 1-3
Progressive Plasma Television
TH-42PA20U-P
GP6DU Chassis
1.38 " (35 mm)
3D Y/C FILTER
LINEAR PIP
V-Chip
EUR7603ZC0
Ferrite cores (large × 5, small × 5)
F type Antenna Adaptor (3C-2V × 2, 5C-2V × 2)
Fixing band
D-SUB 15pin
VIDEO
(Phono Jack Type)
S-VIDEO
(Mini DIN 4-pin)
AUDIO L-R
(Phono Jack Type × 2)
© 2003 Matsushita Electric Industrial Co., Ltd. All
rights
reserved.
distribution is a violation of law.
ORDER NO. ITD0306013C1
B19 Canada: B07
R, G, B /0.7 Vp-p (759)
HD, VD /1.0 -5.0 Vp-p (high impedance)
1.0 Vp-p (759)
Y :1.0 Vp-p (759), C : 0.286 Vp-p
(759)
0.5 Vrms
Unauthorized
copying
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Summary of Contents for Panasonic TH-42PA20U-P

  • Page 1 ORDER NO. ITD0306013C1 B19 Canada: B07 Progressive Plasma Television TH-42PA20U-P GP6DU Chassis Specifications Power Source AC 120 V, 50/60 Hz Power Consumption Maximum :425 W Stand-by condition :0.8 W Plasma Display panel Drive method :AC type 42-inch, 16 :9 aspect ratio Screen Size 36.22 “...

  • Page 2: Table Of Contents

    TH-42PA20U-P AV PROG.OUT VIDEO 1.0 Vp-p (759) (Phono Jack Type) AUDIO L-R 0.5 Vrms (Phono Jack Type × 2) TO AUDIO AMP AUDIO L-R 0.5 Vrms (Phono Jack Type × 2) COMPONENT VIDEO 1.0 Vp-p (including synchronization) INPUT1-2 PB /PR ±...
  • Page 3 TH-42PA20U-P 14.1. Schematic Diagram Notes 14.27. D-Board (4 of 11) Schematic Diagram 14.2. Main Block Diagram 14.28. D-Board (5 of 11) Schematic Diagram 14.3. PF and P-Board Block Diagram 14.29. D-Board (6 of 11) Schematic Diagram 14.4. PF and P-Board (1 of 2) Schematic Diagram 14.30.

  • Page 4: Applicable Signals

    TH-42PA20U-P 1 Applicable signals...

  • Page 5: Safety Precautions

    TH-42PA20U-P 2 Safety Precautions 2.1. 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.

  • Page 6: Prevention Of Electro Static Discharge (Esd) To

    TH-42PA20U-P 3 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 field-effect transistors and semiconductor "chip"...

  • Page 7: About Lead Free Solder (Pbf)

    TH-42PA20U-P 4 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).

  • Page 8: Service Hint

    TH-42PA20U-P 5 Service Hint Board Name Function Board Name Function DATA DRIVER (RIGHT) LINE FILTER DATA DRIVER (LEFT) SCAN DRIVE DIGTAL SIGINAL PROCESS SCAN OUT (DOWN) DIGTAL CORE MICOM SUSTAIN DRIVE FRONT TERMINAL, SWITCH SUSTAIN CONNECTION (UP) REAE TERMINAL SUSTAIN CONNECTION (DOWN)

  • Page 9: Location Of Lead Wiring

    TH-42PA20U-P 6 Location of Lead Wiring 6.1. Lead of Wiring (1)

  • Page 10: Lead Of Wiring

    TH-42PA20U-P 6.2. Lead of Wiring (2)

  • Page 11: Lead Of Wiring

    TH-42PA20U-P 6.3. Lead of Wiring (3)
  • Page 12 TH-42PA20U-P 6.4. Lead of Wiring (4) 6.5. Lead of Wiring (5)

  • Page 13: Self-Check Function

    TH-42PA20U-P 7 Self-check Function When symptoms like “the power fails sometimes” or “sometimes there is no picture and/or sound” can not be confirmed at the time of servicing, the self-check function can be used to confirm the occurrence and to find the defective circuit.

  • Page 14: Power Led Blinking Timing Chart

    TH-42PA20U-P 7.2. Power LED Blinking timing chart 1. Subject Information of LED Flashing timing chart. 2. Contents When an abnormality has occurred the unit, the protection circuit operates and reset to the stand by mode. At this time, the defective block can be identified by the number of blinkes of the Power LED on the front panel of the unit.

  • Page 15: No Power

    TH-42PA20U-P 7.3. No Power First check point There are following 3 states of No Power indication by power LED. 1. No lit 2. Green is lit then turns red blinking a few seconds later. 3. Only red is lit. 1. No lit...

  • Page 16: No Picture

    TH-42PA20U-P 7.4. No Picture 7.5. Local screen failure Plasma display may have local area failure on the screen. Fig - 1 is the possible defect P.C.B. for each local area. Fig - 1...

  • Page 17: Serviceman Mode (Electronic Controls)

    TH-42PA20U-P 8 Serviceman Mode (Electronic Controls) This Receiver has electronic technology using the I C BUS Concept. It performs as a control function and it replaces many mechanical controls. Instead of adjusting mechanical controls individually, many of the control function are now performed by using “On Screen Display Menu”.
  • Page 18 TH-42PA20U-P 7. Press the Power Button on the Remote Control to select one of six Serviceman Adjustment Modes. a. Serviceman MTS ADJUSTMENT. b. Serviceman CLOCK ADJUSTMENT. c. Serviceman VIDEO ADJUSTMENT. d. Serviceman HDEF ADJUSTMENT. e. Serviceman VDEF ADJUSTMENT. f. Serviceman DAF ADJUSTMENT.

  • Page 19: Cat (Computer Aided Test) Mode

    TH-42PA20U-P 9 CAT (computer Aided Test) mode To exit the CAT mode, access the ID mode and switch off the main power. 9.1. IIC mode Select the IIC mode by Up/Down button on the remote control at the front page of CAT mode then press the Action button on the remote control.

  • Page 20: Cd Mode

    TH-42PA20U-P 9.2. CD mode Select the CD mode by Up/Down button on the remote control at the front page of CAT mode then press the Mute button on the remote control more than 5 sec. Micom software version (IC9354), this version can be upgrade by 1.

  • Page 21: Iic Mode Structure (Following Items Value Is Sample Data.)

    TH-42PA20U-P 9.4. IIC mode structure (following items value is sample data.)

  • Page 22: Adjustment Procedure

    TH-42PA20U-P 10 Adjustment Procedure 10.1. +B Set-up 10.2. Driver Set-up 10.1.1. Item / Preparation 10.2.1. Item / Preparation 1. Input a Grey scale signal. 1. Input an APL 100 % white signal. 2. Set the picture controls: - 2. Set the picture controls: -...

  • Page 23: Initialization Pulse Adjust

    TH-42PA20U-P 10.3. Initialization Pulse Adjust 1. Input a Cross hatch signal. 2. Set the picture controls: - Picture mode: Normal White balance: Cool Adjust the indicated test point for the specified wave form. Test point Volume Level TPSC1 (SC) R6523 (SC) 20 ±...

  • Page 24: Printed Circuit Board) Exchange

    TH-42PA20U-P 10.4. P.C.B. (Printed Circuit Board) exchange 10.4.1. Caution 1. To remove P.C.B. , wait 1 minute after power was off for discharge from electrolysis capacitors. 10.4.2. Quick adjustment after P.C.B. exchange P.C.B. Name Test Point Voltage Volume Remarks P Board...

  • Page 25: Adjustment

    TH-42PA20U-P 11 Adjustment 11.1. MTS Adjustment 11.1.1. Input level Adjustment Instrument name Connection Remarks 1. Filter jig TP215 (L out) RF ANT. INPUT 2. 2 RF signal generator Filter jig SCL2, SDA2, FA2 3. RMS voltage meter 4. Measurement computer...

  • Page 26: Sub Contrast Adjustment (Ntsc)

    TH-42PA20U-P 11.2. Sub contrast Adjustment (NTSC) Preparation Picture mode : VIVID (NORMAL SET) Adjustment data : BRIGH, CONT Instrument name Connection Remarks 1. Oscilloscope G out 2. Adjustment check RACK 3. Measurement computer Procedure Remarks 1. Apply a studio color bar. (Other method) 2.

  • Page 27: Pedestal Setting

    TH-42PA20U-P 11.4. Pedestal setting INPUT Equipment Setting Alignment menu Procedure ** Adjust at the dark room. 1 RF Picture: PANEL W/B Normal R cut off 1) Set R,G and B cut off to " 80 ". Gray Scale White balance:...

  • Page 28: Ntsc Panel White Balance

    TH-42PA20U-P 11.5. NTSC panel white balance INPUT Equipment Setting Alignment menu Procedure 1 NTSC Color Picture: 1) Find the nearest area to brightness of 10 cd/m as Low Gray Scale Analyzer Normal Sub Adjust light by color sensor. Pattern White balance:...

  • Page 29: Hd Panel White Balance

    TH-42PA20U-P 11.6. HD panel white balance INPUT Equipment Setting Alignment menu Procedure Color Picture: 1) Find the nearest area to brightness of 10 cd/m as Low Gray Scale Analyzer Normal Sub Adjust light by color sensor. Pattern White balance: Sub Bright 2) Adjust Sub bright to set Low light level to 10 cd/m Cool exactly.

  • Page 30: Sub Brightness Setting

    TH-42PA20U-P 11.7. Sub brightness setting INPUT Equipment Setting Alignment menu Procedure ** Adjust at the dark room. 1 RF Picture: PANEL W/B Gray Scale Normal All cut off 1) Set white balance to Cool . Pattern Aspect: 16:9 2) Adjust All cut off to start some pixels emission at black 2% area and no emission at black 0% area.

  • Page 31: Hotel Mode

    TH-42PA20U-P 12 Hotel mode 1. Purpose CAUTION Restrict a function for hotels. This setup is not valid, unless data of EEPROM (ADDRESS 1584) will be 01, even if each settings were 2. Access command done.     ·    Enter to the Service Mode.
  • Page 32 TH-42PA20U-P...

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