Function Control Operation/Test - Samsung QN55Q75CNF Service Manual

4. Troubleshooting

4-1-5. Function Control Operation/Test

<FUNCTION>
1. TV in Standby
2. Check LED Status.
NOTE
Can be turned off in menu.
3. If LED is OFF (& LED should be on with menu setting)
LED 1.7Vdc (pin 8) and VCC for 3.3Vdc (pin 3)
9
• If OK replace Function Assy.
• If Missing check Main Assy/Function Cable.
4. If LED is ON
Switch Operation activates on screen display.
9
[On Screen Selections with Function Control]
• If missing:
Key_Input 1 (Pin 6) or Key_Input2 (Pin 7)
9
• If wrong voltage or no change:
Switch for stuck or miss-operation.
9
5. Check IR operation with Standard Remote command changes.
(3.3V to 2.5V effective DC)
6. SDA , SCL for effective 3.3Vdc (after power on)
- If missing suspect Function Assy/Cable Assy./Main Assy.
4-8
1
To CN1501
Main Board
3
5
7
LED Status /
Function Switch
change to 0V with a command.
CN1501 (FUNCTION & IR)
IR 3.3Vdc to 2.5Vdc
(Effective DC)
A3.3V_PW
SENSOR_SDA_I2C 3.3Vdc
(effective DC)
KEY_INPUT2
1.8dc to 0V with command
2 GND
SENSOR_SCL_I2C 3.3Vdc
4
(effective DC)
KEY_INPUT1
6
1.8dc to 0V with command
LED_STB_OUT
8
1.7Vdc STBY