LG 47GA7900-UA (CHASSIS:LA37G) Service Manual ▷ View online
Checking order
1, 2. Check IR cable condition between IR & Main board.
3. Check the st-by 3.3V on the terminal 6.
4. When checking the Pre-Amp when the power is in ON condition, it is normal when the Analog
3. Check the st-by 3.3V on the terminal 6.
4. When checking the Pre-Amp when the power is in ON condition, it is normal when the Analog
Tester needle moves slowly, and defective when it does not move at all.
Standard Repair Process Detail Technical Manual
Remote controller operation checking method
D. Function error
A27
Established
date
Revised
date
Error
symptom
Content
LCD TV
A27
P4102
1
GND
2
KEY1
3
KEY2
4
3.5V_ST
5
GND
6
LOGO_LIGHT
7
IR
8
GND
9
EYE
10
GND
①
②
③
④
2011. 12 .14
<GA64/7900>
Checking order
1, 2. Check Motion cable condition between Motion assy & Main board.
3. Check the 3.3V on the terminal 1.
3. Check the 3.3V on the terminal 1.
Standard Repair Process Detail Technical Manual
Motion Remote operation checking method
Established
date
Revised
date
Error
symptom
Content
LCD TV
A28
P4100
1
3.5V_WOL
2
3.3V
3
WIFI_DM
4
M_RTS
5
WIFI_DP
6
RX
7
GND
8
TX
9
WOL
10
RESET
11
GND
12
CTS
①
②
③
2011. 12 .14
A28
D. Function error
<GA64/7900>
Checking order
1, 2. Check Wifi cable condition between Wifi assy & Main board.
3. Check the 3.3V on the terminal 1.
3. Check the 3.3V on the terminal 1.
Standard Repair Process Detail Technical Manual
Wifi operation checking method
A29
Established
date
Revised
date
Error
symptom
Content
LCD TV
A29
2011. 12 .14
D. Function error
P4100
1
3.5V_WOL
2
3.3V
3
WIFI_DM
4
M_RTS
5
WIFI_DP
6
RX
7
GND
8
TX
9
WOL
10
RESET
11
GND
12
CTS
①
②
③
<GA64/7900>
Changing method
1.
Contact the USB memory. (USB 1,2,3 jack)
2.
Enter the password. (ex. 000000)
* Access USB Memory has each password.
Standard Repair Process Detail Technical Manual
Tool option changing method
A30
Established
date
Revised
date
Error
symptom
Content
LCD TV
A30
②
2012. 02 .03
①
E. Etc
<GA64/7900>