Self-Check Function; Self-Check Of The Microcomputer Control System (Bus Line) - Panasonic TH-42PA20U-P Service Manual

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.
In case of "power failure", flashing of the "POWER" indication (red) at the front of the unit can be used to narrow down the +B
line.
7.1.

Self-check of the microcomputer control system (bus line)

Indicaton method
Press the "ACTION" button in the control panel of the unit simultaneously with the "POWER" button in the control panel of the
unit. Hold them few seconds.
Return to he normal screen
Press any button on the unit or in the remote control.
Screen Display
Display
MEMORY
SOUND
YUV_SW
GC2M1
GC2S1
PANEL
TNR1
MTS
EXDAC
GC2M2
GC2S2
TNR2
AVSW
CONV
SND2
Ref. No. Description
IC002 EEPROM for Main MPU
IC2401 Sound Control
IC4301 YUV switch
IC4501 Global Core 2 for main
IC4502 Global Core 2 for sub
- - - - - Panel
TNR201 Tuner 1
IC4205 Multiplex sound
IC8031 External I/O
IC4501 Global Core 2 for main
IC4502 Global Core 2 for sub
TNR251 Tuner 2
IC4302 AV switch
IC3801 Convert Micom
IC4203 BBE
13
Board
DG
H
H
DG
DG
- - - - -
TA
H
DG
DG
TB
H
DG
H
TH-42PA20U-P