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Service Manual
Model No.: HL55XZK22a
4-2-1 Function Description:
Main Board
Process signal which incept from exterior equipment then translate into signal that panel can display.
4-2-2 Connector definition
Main board connector
Power connectors (CN3, CN5)
CNA1
Pin number
Signal name
1
+12V
2
+12V
3
GND
4
GND
5
5VSB
6
GND
7
PSON
Notes:
CN1-Pin 2: Backlight on/off:
The system can turn on or turn off the backlight of TFT LCD Panel through the power supply
unit path.
CNA1-Pin 7: System power on / standby
System board will use this pin to control system power.
CN1-Pin 1: Control the luminance of backlight
The system can generate the PWN signal to control the strength of TFT LCD Panel's
backlight through this connector
Keypad and remote connector (CNE1,CNE2)
CNE1
Pin number Signal name
SB5V
1
IR
2
LED_R
3
LED_G
4
GND
5
14
CN1
Pin number
Signal name
1
DIMMING
2
ON/OFF
3
GND
4
SELECT
CNE2
Signal name
Pin number
GND
1
AD1
2
AD2
3
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