Samsung UN KU650DF Series Service Manual page 71

4. Troubleshooting
FUNCTION/IR Control
„
1. TV in Standby
√ LED Status
2. If LED is OFF
√ LED 1.7Vdc (pin 8)and VCC for 3.3Vdc
• If missing suspect Function Assy/Cable/Main board.
3. If LED is ON
√ Switch Operation activates on screen display.
<On Screen Selections with Function Control>
If missing:
1. Check the STBY voltage from SMPS to Main Board. If STBY is OK suspect
2. Check Jog Shuttle 5 SW Operation (
which also holds data to Main preventing operation.
3. SDA, SCL for effective 3.3Vdc (after power on)
Check
4. Check IR with Standard Remote command changes. (3.3V to 2.5V effective DC)
<Function/IR>
<Jog Function Switch>
4-2
Key 1 & Key 2) for command changes. If incorrect suspect a stuck Jog switch
1 IR 3.3Vdc to 2.5Vdc (Effective DC)
3 A3.3V_PW
AMP_SDA_I2C 3.3 Vdc (effective
5
DC)
KEY_INPUT2 1.8Vdc to command
7
Voltage
9 N/C
11 N/C
P CMD
1 Center
2 Vol+
2 Vol-
2 CH+
2 CH-
3
Main Board.
CN1101 (FUNCTION/IR)
2
AMP_SCL_I2C 3.3Vdc (effective
4
KEY_INPUT1 1.8dc to 0V with
6
8 LED_STB_OUT 1.7Vdc STBY
10
12
Signal
Key 1
Key 2
Key 2
Key 2
Key 2
GND
GND
DC)
PWR On command
N/C
N/C
DC Voltage
1.8V to 0 Vdc
1.8V to 1.0 Vdc
1.8V
to 1.5 Vdc
1.8V to 0 Vdc
1.8V to 0.6 Vdc