Panasonic TX-21FX50T Service Manual ▷ View online
1.5.
GP41
Chassis
Block
Diagram
GP41 CHASSIS BLOCK DIAGRAM
CRT
defl.
coil
CRT
DRIVE
VM DRIVE
L
FRONT INPUTS
AV2 : V/L/R
MAIN
POWER
SWITCH
G
GEOMAGNETIC
WOOFER
AMP
IC2401
PVP
IC1801
R/G/B
SCL
SDA
CVBS IN
REAR INPUTS
AV1 : V/L/R
AV 3 : YUV/V/L/R
AV1 : V/L/R
AV 3 : YUV/V/L/R
VCT-IF
IC601
V_IN
CVBS OUT
MON_OUT
R
G
B
G
B
R/G/B
MON_OUT
V/L/R
EEPROM
IC1101
VM
SCL SDA
A_IN
IF
H
A
AUDIO
OUT
V
SPEAKER
AUDIO
AMP
IC2301
V OUT
H OUT
TUNER
FRONT INPUTS
AV2 : V/L/R
PP
29" models
PIP models
4
TX-
21FX5
0T
2 Service Hints
2.1. Service Position for E-Board
1. Remove the back cover.
2. Stand the TV set as shown in Fig. 2.
3. Remove the A-Board from the TV set by pulling the main board out as shown in Figure 2.
Fig. 2
2.2. Factory Mode Adjustment
1. Factory Mode Adjustment.
a) Set timer ON
b) Press remote’s RECALL (
) and panel’s volume down key simultaneously to enter SERVICE 1.
2. To Set Self-Check:
Press the volume down button on TV then press the Off Timer Button on remote control.
3. Service Mode 1 Controls
4. Service Mode 1 Function
5. Service Mode 2 Controls
To enter SERVICE 2; press channel key ‘1’ in SERVICE 1 entry screen.
5
TX-21FX50T
NOTE :- Service mode 2 options bit.
6. Service Mode 3 Controls
To enter SERVICE 3; press channel key ‘1’ in SERVICE 2 entry screen.
7. Service Mode 3 Function
6
TX-21FX50T
2.3. Adjustment for White Balance
Preparation:
1. Receive the white balance pattern and aging should have been performed over 30 minutes.
2. Set the picture menu to DYNAMIC NORMAL.
3. Degausse the CRT face.
4. Fix the CRT colour analyzer receiver unit to CRT face.
Adjustment of Low Light.
1. Adjustment Sub Bright, so that Y = 6.5 ± 1.0 nit.
2. Adjustment R-CUT OFF, so that X = 0.313 ± 0.015 nit.
3. Adjustment G-CUT OFF, so that Y = 0.320 ± 0.015 nit.
Adjustment of High Light
1. Adjustment Sub Bright, so that Y = 150 nit.
2. Adjustment R-Drive, so that X = 0.275 ± 0.015 nit.
3. Adjustment B-Drive, so that Y = 0.285 ± 0.015 nit.
2.4. Adjustment for CRT CUT OFF
Preparation:
1. Connect the oscilloscope probe to TPL5.
2. Screen VR min.
3. Set the data Sub Bright, Bright.
4. In service Mode at “Bright” dac press [5] in factory mode to enter vertical line and adjust by volume down or up button.
5. Adjust “Screen VR” until 1-H Line appears.
7
TX-21FX50T