Panasonic gp8du gph8du th-37px50u th-42pd50u th-42px50u th-42px500u th-50px50u th-50px500u troubleshooting User Manuals

Table of Contents

• Objective

  1
• Specifications (Models Comparison)

  2
• Safety Precautions

  3
• TH-42PD50U Board Description and Part Numbers

  4
• TH-42PX500U Board Description and Part Numbers

  5
• TH-50PX500 Board Description and Part Numbers

  6
• Power Supply Outline for 42”and 50” Models

  7
• Standby Circuit

  8
• Power On Operation

  12
• Power Supply Connections

  15
• P Board

  15
• PA Board

  16
• PB Board

  17
• TH-42PX500U Block Diagram

  18
• TH-42PX50U Block Diagram

  21
• TH-42PD50U Block Diagram

  23
• Video Input Selection Block Diagram

  25
• Audio Input Selection Block Diagram

  26
• ATSC, SD and PC Card Input Signal Flow

  27
• DG Board Block Diagram

  28
• Signal Process Circuit

  30
• Main Picture Signal Flow

  30
• Sub Picture Signal Flow

  30
• RGB Processor

  31
• D Board Block Diagram

  32
• C1 Board Block Diagram

  33
• SC Board Explanation

  34
• SC board Waveform

  35
• SU And SD Board Shift Registers

  35
• SS Board Explanation

  37
• SS Board Schematic

  38
• SS Board Waveform

  38
• TH-42/50PX500U

  40
• Power LED Flashing timing chart

  40
• SOS Detection Circuits

  41
• SOS Detect (D Board)

  41
• SOS Detect (DG Board)

  41
• SOS Detect (D and PA Board)

  42
• PA Board SOS Detection Circuits

  43
• Over-Voltage Detection of Main Voltage (10 Blinks)

  43
• Short Circuit Detection of Main Voltage (10 Blinks)

  44
• Short Circuit Detection of Sub-voltage (10 Blinks)

  45
• Other SOS Detection Circuits

  46
• SOS Detect (P, SC, and SS Board)

  46
• P Board SOS Detection

  47
• Voltage Distribution of the PA board and SOS Detection

  48
• Z Board (Sound) SOS Detection

  50
• TH-42/50PX500U Self-check Function (Reset)

  51
• Diagnostic Procedures

  51
• How to access the Self-check Screen (Reset)

  51
• How to exit the Self-check Screen

  51
• Screen Display

  51
• TH-42PD50U

  53
• Power LED Flashing timing chart

  53
• TH-42/50PD50U Self-check Function

  54
• Diagnostic Procedures

  54
• How to access the Self-check Screen (Reset)

  54
• How to exit the Self-check Screen

  54
• Screen Display

  54
• Serviceman Mode

  56
• How to enter the Serviceman Mode

  56
• Adjustment method

  56
• Cancellation

  56
• Contents of adjustment mode

  56
• Internal Pattern Generator

  57
• Cable Diagnostic Screen

  57
• Adjustments

  58
• Driver Set-up

  58
• Initialization Pulse Adjustment

  59
• Drive Waveform

  59
• P.C.B. (Printed Circuit Board) exchange procedure

  60
• Adjustment Volume Locations

  61
• Test Point Locations

  62
• Troubleshooting

  63
• No Picture or Partial Picture

  63
• Scan and Sustain Drive Waveform

  66
• Scan and Sustain Drive Check points

  66
• Vertical line problems

  71
• Picture ok, Sound NG

  72
• No picture, no sound

  73
• No picture, sound ok

  74
• How to determine whether the D board or SC board is defective?

  75
• Additional Troubleshooting Hints

  76
• SC20 or D20 Connector

  77
• How to determine whether the D board or SS board is defective?

  78
• Defective Board

  79
• Glossary and Acronyms

  80