Side Key Troubleshooting - LG GD88O Service Manual

4.18 Side Key Troubleshooting

There are 2 main Key, Volume and Camera Key, which is connected to Sub-PCB.
Volume Key consists of Volume up and Volume down. Also, Camera Key is composed of Focus and Shutter.
Start
Key press
TP1 or TP2 is
High?
Yes
TP3 or TP4 is
High?
Yes
Check an U200 or
Change the Main board
And Retest
KEY_ROW[0]
KEY_ROW[1]
KEY_COL[0]
KEY_COL[1]
155P
Copyright © 2010 LG Electronics. Inc. All right reserved.
Only for training and service purposes
NO
Check Sub-PCB
NO
Check R211 and R212
MDDI_P_STB_M
VREG_MSMP_2.6V
LCD_CVT_RESET_N
LCD_CVT_VSYNC
56K 56K
TP4 TP
R211
470
R212
470
TP2
TP1
R213
470
R214
LIN_MOTOR_EN
470
- 155 -
4. TROUBLE SHOOTING
4. Troubleshooting
LCD_CVT_INT
PM_ON_SW
(BB)
13
14
15
16
17
18
19
20
21
22
23
24
LGE Internal Use Only