Wednesday, October 28, 2015

PANASONIC TH-37LRU20 SERVICE MODE AND POWER SUPPLY CIRCUIT

PANASONIC TH-37LRU20

SERVICE MODE AND POWER SUPPLY CIRCUIT 

How to enter into Service Mode
Set "Hotel Mode" Off
Service Mode can not be entered if Hotel mode is "On" (Activating). Hotel Mode should be set to "Off" by using only Remote Control as following procedure.
1. Press [MENU], [G], [Y] and [0] buttons on the remote control by turns to display "Hotel Mode setup menu".
2. Select the item "Mode" and set "Off" status.
3. Select the item "Save" and press [OK] button.
4. Disconnect the AC cord from wall outlet, or press and hold the [POWER] button at right side on the main unit for 10 seconds or more.
Enter into Service Mode
While pressing [VOLUME ( - )] button of the main unit, press [INFO] button of the remote control three times within 2 seconds.
Key command
[1] button...Main items Selection in forward direction
[2] button...Main items Selection in reverse direction
[3] button...Sub items Selection in forward direction
[4] button...Sub items Selection in reverse direction
[VOL] button...Value of sub items change in forward direction ( + ), in reverse direction ( - )
SERVICE TOOL 
How to access
1. Select [SRV-TOOL] in Service Mode.
2. Press [OK] button on the remote control.
Display of SOS History
SOS History (Number of LED blinking) indication.
From left side; Last SOS, before Last, three occurrence before, 2nd occurrence after shipment, 1st occurrence after shipment.
This indication except 2nd and 1st occurrence after shipment will be cleared by [Self-check indication and forced to factory shipment setting].
POWER ON TIME/COUNT
Note : To display TIME/COUNT menu, highlight position, then press MUTE for 3 seconds.
Time : Cumulative power on time, indicated hour : minute by decimal
Count : Number of ON times by decimal
Note : This indication will not be cleared by either of the self-checks or any other command.
Exit
1. Disconnect the AC cord from wall outlet, or press and hold the TV's [POWER] button for 10 seconds or more.
Hotel mode
1. Purpose
Restrict a function for hotels.
2. To display Hotel mode setup menu Press [MENU], [G], [Y] and [0] buttons on the remote control by turns
3. Setting for each items
Select item by [UP]/[DOWN] button on the remote control and change the setting by [LEFT]/[RIGHT] button on the remote control. After the setting, select "Save" and press [OK] button on the remote control to store.
4. To exit the Hotel mode setup menu
Disconnect the AC cord from wall outlet, or press and hold the [POWER] button at right side on the main unit for 10 seconds or more.
5. Explain the Hotel mode setup menu
Power LED Blinking timing chart
1. Subject
Information of LED Flashing timing chart.
2. Contents
When an abnormality has occurred to the unit, the protection circuit operates and resets to the stand by mode. At this time, the defective block can be identified by the number of blinks of the Power LED on the front panel of the unit.

Measurements and Adjustments
VOLTAGE
TEST POINT
SPECIFICATION (Reception state)
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

Picture level adjustment (RF)
< procedure >
1. Receive the Sprit color bar.
(Screen mode: ZOOM or FULL Picture mode: DYNAMIC AI: OFF AI Picture: OFF)
*BACK LIGHT +30
< Inspection >
1. Enter Service mode, and go to "ADJUST-CONTRAST" to adjust the picture level.
Volume UP/DOWN key makes GAIN displayed under PICTURE to set.
POWER SUPPLY CIRCUIT 

CLICK ON THE IMAGE TO ZOOM IN