Samsung GQ49Q8 Series, Service Manual

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4. Troubleshooting
4-1. Function Control Operation Test
[On Screen Selections with Function Control]
„
FUNCTION/IR Control Test
1. TV in Standby
2. Check LED Status
3. If LED is OFF
9
Check LED 1.7Vdc (pin 17/14) and VCC for 5Vdc (pin 7/4)
• If missing suspect Function Assy/Cable/Main board.
4. If LED is ON
9
Check Switch Operation activates on screen display
• If missing:
9
Check Key _Input1 Pin 11/11 change to 0V with a command.
• If wrong voltage or no change:
9
Check Switch for stuck or miss-operation.
5. Check IR Pin 10/10 operation with Standard Remote command changes. (5V to 3.3V effective DC)
6. SDA pin 14/17, SCL pin 13/15 for effective 5Vdc (after power on)
• If missing suspect Function Assy/Cable Assy./Main Assy.
4-1
4. Troubleshooting