First, you should power off the TV with the manual switch on the front and disconnect the power to the unit. If you have the set wall-mounted, for the first time it will be probably better to remove it from the wall. After you have done this once and know the drill, you will be able to connect the service cable with the unit on the wall for future MLL resetting. The service connector on 11G and 12G models is easily accessible from the back without removing/unscrewing any back panels. You can locate it under the black plastic cover which can be opened with a flat screwdriver by bending the plastic notch. The service connector is a JST PH type, namely B11B-PH-SM4-TB. For 2010 models, the service connector is located under black plastic self-adhesive sticker (Panasonic cutting costs?) so you need to peel it off to gain access. The service connector is a JST GH type, model BM11B-GHS-TBT.

• for the TX-P42G10E model (and possibly other G10 models as well), pin 1 is at the top, pin 11 at the bottom.
• for the TC-P54V10 model (and possibly other V10 models as well) the service connector is horizontal on the TV, with pin 1 towards the center of the TV.
• for the TX-P46Z1E model the service connector is vertical close to the stand on the left. Pin 1 at the bottom, pin 11 at the top.

The pin-out for the connector is as follows:

1 +5V
2 SRQ (Service Request)
3 GND (Ground)
4 GENX8_SCL (STBY EEPROM)
5 GENX8_SDA (STBY EEPROM)
6 PEAKS_SCL (PEAKS EEPROM)
7 PEAKS_SDA (PEAKS EEPROM)
8 PANEL_SCL (PANEL EEPROM)
9 PANEL_SDA (PANEL EEPROM)
10 I2C_CONT (I2C Control)
11 D_PCB_MODE (Process Control Block)

For accessing the A-board EEPROM through I²C bus, you will need to connect communication pins 9 and 8 to the Arduino’s pins A4 and A5. Also, you need to connect pins 3 and 10 to the Arduino’s GND pins, which will mute all other I2C masters on the bus so that the A-board EEPROM can talk to the Arduino board without disruption.

You could interconnect pins 3 and 10 right at the JST service connector and run only three wires from the back of the TV to the Arduino board, but such a cable could not be left connected to the TV after performing the reset, because the TV’s logic will force the panel to remain shut thinking you are still accessing the I²C bus. Therefore it is better to run four wires from the TV to the Arduino board and interconnecting those pins only at the Arduino by connecting to it’s both GND pins. This way you can leave the cable connected to the TV and tuck it behind once you’re done with the reset, keeping it ready for the future use.

Once you have the cable ready, you can proceed to the next page (or get a pre-made one while stock lasts).

Next: Reading A-board EEPROM