Saturday, April 27, 2019

TH L39EM5D – Panasonic LCD TV – how to enter the service mode, adjustments, Power board voltages and schematic


Power LED blinking timing chart - Chassis: KM18, Destination: India
How to enter into service mode
While pressing Volume (-) button of the main unit, press (INFO) button of the remote control three times within 2 seconds.
Contents of the adjustment mode
·         Value shown as a hexadecimal number.
·         Preset value differs depending on models.
·         After entering the adjustment mode, take note of the value in each item before starting adjustment.


To exit the service mode, off the power with the power button on the main unit, or the power button on the remote control.
SRV Tool
To access this tool:
Select the (SRV-Tool) in service mode.
Press OK button on the remote control.
To display the SOS history
SOS history (number of LED blinking) indication.
From the left side; last SOS, before Last, three occurrence before, 2nd occurrence after shipment, 1st occurrence after shipment.
This indication except 2nd and the 1st occurrence after shipment will be cleared by [self-check indication and forced to factory shipment setting]
Power on time count
To display the Time count menu, highlight position, and then press Mute for 3 seconds.
Time: cumulative power On time, indicated hour, minute be decimal.
Count: number of ON times by decimal.
This indication will not be cleared by either of the self checks or by other command.
To exit, disconnect the AC chord fro wall outlet.
Self-check mode
Press the Menu button n the remote control, and the Volume Down button on the SCD panel.
Press the ON/Off button on the panel to exit.
Hotel mode adjustment
In order to display the Hotel mode setup menu, enter the following command; within 2 seconds.
TV: VOL DN +
Remote: Input 3 times.
To exit the hotel mode setup menu, disconnect AC power cord from the wall socket.
To check the IIC bus lines
Self check indication only:
Produce TV reception screen, and while pressing Volume[-] button on the main unit, press [Ok] button on the remote control  for more than 3 seconds.
Self-check indication and forced to factory shipment setting:
Produce TV reception screen, and while pressing [Volume (-)] button on the main unit, press [Menu] button on the remote control for more than 3 seconds.
Disconnect the AC cord from the wall socket to Exit.
Power LED blinking timing chart
When an abnormality occurs, the protection circuit will operate and the reset the unit to stand by mode.  During this time, the defective block can be identified by the number of blinking times of the power LED on the front panel of the unit.
Voltages of A and P boards and the schematic of P-Board
Power board-TNP4G532AA – schematic