Led Doesn't Work - LG SPM2 Service Manual

4. LED DOESN'T WORK

When you turn on your set, Boots up and works, but the LED does not work.
4-1. Check LED power (LED_PWR) and I2C, LED_SDB
4-1-1. Solution
Replace MAIN board.
4-1-2. How to troubleshoot (Countermeasure)
1) Please check status of LED cable connection. (at CN101 and LED Board)
2) Please check LED_PWR (5 V).
a) If LED_PWR is abnormal, replace MAIN board.
b) If LED_PWR is OK, replace LED board.
3) Please check I2C(point 2, 3), LED_SDB(point 4).
a) If I2C is abnormal, replace MAIN board.
b) If LED_SDB is Low, replace MAIN board.
c) If I2C and LED_SDB is OK, replace FRONT board.
4-1-3. Service hint (Any picture / Remark)
ONE POINT REPAIR GUIDE
5V0
5V0
GND
GND
SD A
SCL
SD B
D GND
< MAIN board top view >
LED _PW R
L101
 
220ohm /2200m A
D GND
 
L126
600ohm /0.5A
LED _SD A
 
L127
600ohm /0.5A
LED _SCL
 
L128
600ohm /0.5A
LED _SD B
3-13
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 
   
 
CN101 CN101
Only for training and service purposes.