Samsung UE40MU6122K Service Manual page 53

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