How To Check Fault Symptom; Power - Samsung UN55MU850DF Service Manual

4. Troubleshooting

4-2. How to Check Fault Symptom

4-2-1. Power

FUNCTION/IR Control
„
1
2
3
4
5
6
1. TV in Standby
LED Status
9
2. If LED is OFF
LED 1.7Vdc (pin 8) and VCC for 3.3Vdc (pin 3)
9
• If missing suspect
3. If LED is ON
Switch Operation activates on screen display.
9
[On Screen Selections with Function Control]
If missing:
-
Key _Input1 Pin 6
9
If wrong voltage or no change:
-
Switch for stuck or miss-operation.
9
4. Check IR operation with Standard Remote command changes. (3.3V to 2.5V effective DC)
5. SDA , SCL for effective 3.3Vdc (after power on)
If missing suspect
-
4-2
CN1601 (FUNCTION/IR)
IR_TX_OCM
DGND
A3.3V_PW
IRB_SCL_I2C
IRB_SDA_I2C
KEY_INPUT1
Function Assy/Cable Assy/Main Board.
change to 0V with a command.
Function Assy/Cable Assy/Main Board.
7
8
9
10
11
12
<Function/IR>
KEY_INPUT2
LED_STB_OUT
A3.3V_PW
NC
NC
NC
LED Status / Function Switch