Samsung UE49KS9000T Service Manual page 39

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FUNCTION/IR Control
IR 3.3Vdc to 2.5Vdc (Effective DC)
1
3
5
AMP_SDA_I2C 3.3 Vdc (effective DC)
KEY_INPUT2 0V (no operation change)
7
9
A3.3V_PW 3.3V to Deco Lamp
<DECO Lamp>
1.
TV in Standby
LED Status
2.
If
LED is OFF
LED 1.7Vdc (pin 8) and VCC for 3.3Vdc (pin 3)
If missing suspect
3.
If
LED is ON
Switch Operation activates on screen display.
<On Screen Selections with Function Control>
-
If missing:
Key _Input1 Pin 6
-
If wrong voltage or no change:
Switch for stuck or miss-operation.
IR operation with Standard Remote command changes. (3.3V to 2.5V effective DC)
4.
Check
, SCL for effective 3.3Vdc (after power on)
5.
SDA
-
If missing suspect
CN910 (FUNCTION/IR)
A3.3V_PW
Function Assy/Cable Assy/Main Assy.
change to 0V with a command.
Function Assy/Cable Assy/Main Assy.
2
AMP_SCL_I2C 3.3Vdc (effective DC)
4
KEY_INPUT1 1.8dc to 0V with command
6
8
LED_STB_OUT 1.7Vdc STBY
LED_CTRL to Deco Lamp 1Vdc (off) 0.5V (On)
10
<Function/IR>
4. Troubleshooting
GND
CN910
LED Status / Function Switch
4-3

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