LG GX / SPN5-W Service Manual page 40

NO BOOTING WHEN YOU TURN THE UNIT ON, NO MESSAGE OR "HELLO"
ON FRONT PANEL
When you turn on your set, it will blank / no message on front panel, LCD doesn't work.
1-4. LCD System power VCC_5V
1-4-1. Solution
Replace MAIN/ LCD module.
1-4-2. How to troubleshoot (Countermeasure)
1) Please check VCC_5V of CNF01 pin14.
2) If VCC_5 V is abnormal, replace FRONT and MAIN board.
3) If VCC_5 V OK, replace LCD module.
1-4-3. Service hint (Any picture / Remark)
CNF01 CNF01
ONE POINT REPAIR GUIDE
TPF7
 
TO LCD MODULE
LED(+)
14
LED(-)
13
CSB
12
RSTB
11
CD 10
SCK
9
SDA
8
VDD
7
VSS
6
VB0-
5
VB1-
4
VB1+
3
VB0-
2
VLCD
1
CNF01
 
< FRONT board bottom view >
VCC_5V
RF01 220 (M)
FBF01
RF02 220 (M)
CF02
CF01
CF3
10uF QF01
100nF
10nF
/10V(M)
C
TPF18
E
DGND
TPF14
3.3VA
TPF02
TPF3
CF4 CF5
TPF4 2.2uF 2.2uF
/10V(X5R) /10V(X5R)
TPF5
TPF6
RF03 10M
TPF8 CF6 0.33uF
DGND
TPF7 TPF7
pin14 pin14
VCC_5V VCC_5V
3-7
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TPF01
B
TPF9
TPF10
TPF11
TPF12
TPF13
Only for training and service purposes.