LG SPM2 - Before Reporting Product Malfunction; Troubleshooting Common Issues

3-5
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Only for training and service purposes.
< MAIN board top view > < MAIN board bottom view >
70mA
Bluetooth: 35mA
MCL3730: 35mA
SoC 3V3
C864
6.3V/22uF
R838
0
C857
10V/0.1uF
C870
10V/0.1uF
C862
10V/0.1uF
R840
47K
C856
50V/0.01uF
C861
50V/0.01uF
C867
16V/1uF
C868
10V/0.1uF
R837
10K
3
NC
GND
EN
OUT IN
2
4
51
IC804
D808
B5819WBRE
C863
50V/0.01uF
R839
OPEN
C859
10V/10uF
C869
50V/0.01uF
L813
220ohm/2200mA
L814
220ohm/2200mA
VDD33A
DGND
ONE POINT REPAIR GUIDE
NO BOOTING WHEN YOU TURN THE UNIT ON, STANDBY LED DOESN’T WORK
When you turn on your set, LED doesn’t work.
1-2. IC804 VDD33A
1-2-1. Solution
Replace MAIN board.
1-2-2. How to troubleshoot (Countermeasure)
1) Please check VDD33A of IC804 pin5.
2) If 3.3 VA is abnormal, replace MAIN board.
3) If 3.3 VA is OK, check IC802 (MCS_1V2).
1-2-3. Service hint (Any picture / Remark)


IC804
IC804
L814
L814

