Panasonic TX-LR37U20 Service Manual ▷ View online
TX-LR37U20
33
7.19. Stand MTG Assembly
(Refer each part no. to part list)
1. STAND MTG are put in BAG.
2. BAG is wrapped around STAND MTG.
3. SCREW is put in the BAG and use yellow tape to hold screw bag.
2. BAG is wrapped around STAND MTG.
3. SCREW is put in the BAG and use yellow tape to hold screw bag.
TX-LR37U20
34
8 Measurements and Adjustments
8.1.
Voltage chart of A-board
Set A-Board to a dummy set and check the satisfaction with the specified voltage as following table.
8.2.
Voltage chart of P-board
Set IP-Board to a dummy set and check the satisfaction with the specified voltage as following table.
8.3.
Picture level adjustment (RF)
Power Supply Name
Measurement Point
Specification (V)
SUB1.8V
TP5601
1.74 - 1.90
SUB1.2V
TP5600
1.18 - 1.32
SUB3.3V
TP5602
3.19 - 3.46
SUB5V
TP5200
4.9 - 5.1
SUB9V
TP5220
8.82 - 9.18
STB5V
TP5400
4.9 - 5.1
Power Supply Name
Test Point
Normal Condition
Test Point
17V
TP7952, TP7953
18 ± 2 V
D7503K
DTV12V
TP7954, TP7955
12.2 ± 0.6 V
D7552K
TUNER6V
TP7956, TP7957
6.1 ± 0.3 V
D7603K
DC390V
TP7201, TP7801,
TP7802, TP7803,
TP7802, TP7803,
TP7804
390 ± 10 V
Q7803D
Instrument Name
Remarks
1. REMOTE TRANSMITTER
2. Ex. Signal (Sprit color bar)
2. Ex. Signal (Sprit color bar)
Adjustment or Inspection Procedure
Remarks
procedure
1. Receive the Sprit color bar.
(Screen mode: ZOOM or FULL Picture mode: DYNAMIC AI: OFF AI Picture: OFF)
*BACK LIGHT +30
*BACK LIGHT +30
Inspection
1. Enter Service mode, and select MAIN_ADJ PICTURE.
Volume UP/DOWN key makes GAIN displayed under PICTURE to set.
Pushing the remote controller [OK] key for about 3 seconds, GAIN is suited
to the adjustment value automatically.
Pushing the remote controller [OK] key for about 3 seconds, GAIN is suited
to the adjustment value automatically.
(The Sprit Color Bar Pattern)
TX-LR37U20
35
8.4.
Picture level adjustment (VIDEO)
8.5.
Picture level adjustment (YUV)
Instrument Name
Remarks
1. REMOTE TRANSMITTER
2. Video signal generator (100% Color bar)
2. Video signal generator (100% Color bar)
Adjustment or Inspection Procedure
Remarks
procedure
1. Receive 100% Color bar.
(ASPECT: ZOOM or FULL, Picture mode: VIVID, AI Picture: OFF)
* BACK LIGHT MAX VALUE
* BACK LIGHT MAX VALUE
Inspection
1. Enter Service mode, and select ADJUST CONTRAST.
Volume UP/DOWN key makes GAIN value displayed on the right of CONTRAST to set.
Pushing the remote controller [OK] key for about 3 seconds, GAIN is suited to the adjustment value
automatically.
Pushing the remote controller [OK] key for about 3 seconds, GAIN is suited to the adjustment value
automatically.
Instrument Name
Remarks
1. REMOTE TRANSMITTER
2. Component Video signal generator (100% Color bar 1080i)
2. Component Video signal generator (100% Color bar 1080i)
Adjustment or Inspection Procedure
Remarks
procedure
1. Receive 100% Color bar.
(ASPECT: ZOOM or FULL, Picture mode: VIVID, AI Picture: OFF)
* BACK LIGHT MAX VALUE
* BACK LIGHT MAX VALUE
Inspection
1. Enter Service mode, and select ADJUST CONTRAST.
Volume UP/DOWN key makes GAIN value displayed on the right of CONTRAST to set.
Pushing the remote controller [OK] key for about 3 seconds, GAIN is suited to the adjustment value
automatically.
Pushing the remote controller [OK] key for about 3 seconds, GAIN is suited to the adjustment value
automatically.
TX-LR37U20
36
9 Block Diagram
9.1.
Main Block Diagram
(L
E
D
:7
T
IM
E
S
)
(L
ED
:1
TIM
ES
)
(L
E
D
:4
T
IM
E
S
)
(L
ED
:3
TIM
ES
)
(L
E
D
:9
T
IM
E
S
)
(L
ED
:3
TIM
ES
)
STB5V
TMDS DATA
DCDC
V10
STB_RESET
TUNER5V
INV_SOS
OVP_DET
ERROR DET
TUNER5V
(SIDE)
POWER LED(R)
DTV12V
POWER CONTROL
LCD PANEL
TUNER6V
STB3.3V
INV_SOS
STB5.8V
DCDC
D/A
RECTIFIER
+5.8VS
SUB5V
PANEL POWER SOS
VOFF2-6V
SUB9V
(SIDE)
DCDC
V
SUB9V
SOUND SOS
STB_RESET
DVDD2.5V
AMP
DCDC
SOUND SOS
STB3.3V
VCON31V
INV_ON
(STM)
(SIDE)
DTV_L/R
DROP
D/A CONVERTOR
SUB1.2V
STB5V
CONTROL PANEL
DVB_CVBS
R
L/R
HDMI I/F
PFC CONTROL
V-BOARD
ANALOG-ASIC
Y/PB/PR, R/G/B/H/V CVBS
VOLTAGE
HDMI3
V/Y/PB/PR
STANDBY VOLTAGE RECTIFIER
C.A.T.S. SENSOR
V
DTV12V SENSE
INV_ON
SUB3.3V
PANEL POWER SOS
OPTICAL AUDIO OUT
DCDC
DVDD2.5V
OVP_DET
DCDC
DTV12V
INVERTER POWER CONTROL
CURCUIT
PWM
SUB1.8V
VIDEO PROCESSOR
STB+3.3V
SUB5V
R/G/B/H/V
PWM
VREF_1-12
REMOTE RECEIVER
OVER
AC CORD
STB+3.3V
12V
SUB 3.3V SENSE
AUDIO
PANEL
EEPROM
AUDIO PROCESSOR
SUB_ON
TS Parallel
SD CARD DATA
OPERATION BUTTON
VOLTAGE
K-BOARD
HDMI2
A02
EEPROM
K01
NAND FLASH
DVDD2.5V
ON
HDMI1
LIVE
+5.8VS
INV_PWM
TMDS DATA
POWER LED
INV_PWM
INV_SOS
SUB1.8V
SPEAKER(R)
(A Chip)
AV2
CPU BUS I/F
(D Chip)
CONTROL
DCDC
NEUTRAL
17V
SOS DET
A-BOARD
PANEL
OPTICAL OUT
SUB_ON
SOS DET
AV SW
AVDD13.7V
PC
MONITOR L,R
POWER LED
P-BOARD
POWER SUPPLY
MONITOR OUT
MONITOR V
DIGITAL SIGNAL PROCESSOR
OPTICAL
V
REMOTE RECEIVER
A/D CONVERTOR
AVDD13.7V
P5,P6.P7,P8
C.A.T.S. SENSOR
AVDD13.7V
RECTIFIER
LINE FILTER
SOUND17V
AUDIO
A14
SPEAKER(L)
HP
AV3
HEADPHONE
CPU BUS
INV_PWM
SD CARD
OUT
AV1
SUB ON/OFF
L
+5.8VS
RECEIVER
L/R
HOT START
(DAC_ENB)
SD CARD DATA
TMDS DATA
PROCESS VOLTAGE RECTIFIER
REMOTE IN
L/R
RELAY
32V
DTV12V
Peaks sLD
SOUND17V
TS Parallel
SIF
SUB5V
STB+5.8V
SLOT
SUB3.3V
LVDS DATA
POWER SW
P2
L/R
P1
BACK LIGHT
DCDC
SUB1.2V
A10
LVDS DATA
INV_ON
STB5V
KEYSCAN
A09
A12
C.A.T.S. SENSOR
IFD_OUT
OFDM
SIF_OUT
TUNER
V
USB
USB DATA
(LED:7TIMES)
(LED:1TIMES)
(LED:4TIMES)
(LED:3TIMES)
(LED:9TIMES)
(LED:3TIMES)
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