Samsung QN43Q60TBF Service Manual page 41

4. Troubleshooting
„ FUNCTION/IR Control Test
Main Board Pins
1. Place TV in Power Standby
2. Check LED Status
3. If LED is OFF
Check LED 1.7Vdc (pin 14 ) and VCC for 5Vdc (pin 4 )
9
→
If missing suspect Function Assy/Cable/Main board.
4. If LED is ON
Check Switch Operation activates on screen display
9
[On Screen Selections with Function Control]
• If missing:
Check KEY_INPUT1
9
• If wrong voltage or no change:
Check Switch for stuck or miss-operation.
9
5. Check IR (pin 10 ) operation with Standard Remote command changes. (5V to 3.3V effective DC)
6. Check SDA (pin 17 ),
→
If missing suspect Function Assy/Cable Assy/Main Assy.
FUNCTION/IR Pins
1. Place TV in Power Standby
2. Check LED Status
3. If LED is OFF
Check LED 1.7Vdc (pin 17 ) and VCC for 5Vdc (pin
9
→
If missing suspect Function Assy/Cable/Main board.
4. If LED is ON
Check Switch Operation activates on screen display
9
[On Screen Selections with Function Control]
• If missing:
Check KEY1
9
• If wrong voltage or no change:
Check Switch for stuck or miss-operation.
9
5. Check IR_RX (pin 10 ) operation with Standard Remote command changes. (5V to 3.3V effective DC)
6. Check I2C_SDA (pin 14 ),
→
If missing suspect Function Assy/Cable Assy/Main Assy.
4-2
(pin 11 ) change to 0V with a command.
SCL (pin 15 ) for effective 5Vdc (after power on)
(pin 11 ) change to 0V with a command.
I2C_SCL (pin 13 ) for effective 5Vdc (after power on)
7 )