Sign In
Upload
Download
Table of Contents
Contents
Add to my manuals
Delete from my manuals
Share
URL of this page:
HTML Link:
Bookmark this page
Add
Manual will be automatically added to "My Manuals"
Print this page
×
Bookmark added
×
Added to my manuals
Manuals
Brands
LG Manuals
Cell Phone
U250
Service manual
Keypad Backlight Troubleshooting - LG U250 Service Manual
Lg cell phone user manual
Hide thumbs
1
Table Of Contents
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
page
of
175
Go
/
175
Contents
Table of Contents
Troubleshooting
Bookmarks
Table of Contents
Advertisement
4.14 Keypad Backlight Troubleshooting
Key Pad Back Light is on as below :
Key pressing → KYBD_BACKLIGHT go to 0V → MAIN Key Backlight LED On
Start
Key press
+VPWR is above 3.2V?
KYBD_BACKLIGHT is 0V ?
Backlight LED ON?
Change the Main board
REV_B : EDLH0013501 --> EDLH0006001
KYBD_BACKLIGHT
NO
Yes
NO
Yes
YES
No
KEY_BACK_LIGHT LED(8EA)
+VPWR
LD400
LEBB-S14H
R411
100ohm
LD403
LEBB-S14H
LD404
R414
100ohm
LD406
LEBB-S14H
LD407
R417
100ohm
Figure.Keypad backlight LED part
- 105 -
4. TROUBLE SHOOTING
Check battery
Yes
Change the Main board
END
+VPWR
LD402
LEBB-S14H
LEBB-S14H
LD405
LEBB-S14H
R415
100ohm
LEBB-S14H
LEBB-S14H
LD408
R418
100ohm
R413 100ohm
R416
100ohm
R419 100ohm
Table of
Contents
Previous
Page
Next
Page
1
...
103
104
105
106
Advertisement
Table of Contents
Troubleshooting
TROUBLE SHOOTING
72
Power ON Troubleshooting
93
Charger Troubleshooting
95
USB Troubleshooting
98
SIM Detect Troubleshooting
99
Camera Troubleshooting
101
Keypad Backlight Troubleshooting
104
Main LCD Troubleshooting
105
Troubleshooting Download Errors
128
Related Manuals for LG U250
Cell Phone LG KU250 User Manual
(297 pages)
Cell Phone LG F3000 Brochure
Multimedia 5m phone (8 pages)
Cell Phone LG UX210 User Manual
Lg ux210: user guide (97 pages)
Cell Phone LG UX210 Manual Del Usuario
Teléfono (97 pages)
Cell Phone LG UX145 Manual Del Usuario
Teléfono (102 pages)
Cell Phone LG UX355 Quick Start Manual
Bluetooth pairing, sending a vcard, taking a picture, recording a video, using voice commands (9 pages)
Cell Phone LG US740 Manual
Android 2.1, customizable home screens, tempered glass touchscreen, google maps™ navigation (82 pages)
Cell Phone LG LGUN430 Owner's Manual
Large, easy-to-read screens; scalable font size; loud speakerphone (245 pages)
Cell Phone LG UN430 Blue Quick Start Manual
Quick start guide - english (8 pages)
Cell Phone LG Freedom UN272 Guía Del Usuario
Lg freedom lets you take your favorite features with you anywhere. it’s slim and stylish, with a friendly keyboard and big, bright screen. and best of all, practical enough to fit your life. (191 pages)
Cell Phone LG Splendor US730 Owner's Manual
4.3" display, 1 ghz cpu, true-to-life 720p hd video recording (200 pages)
Cell Phone LG UX830 User Manual
Lg ux830: user guide (247 pages)
Cell Phone LG U8290 Service Manual
(231 pages)
Cell Phone LG U8110 Service Manual
(270 pages)
Cell Phone LG U8110 User Manual
(241 pages)
Cell Phone LG US990 User Manual
(192 pages)
Related Content for LG U250
KU730 Keypad Backlight Troubleshooting
LG KU730
U830 KU830 Keypad Backlight Troubleshooting
LG U830 KU830
KU800 Keypad Backlight Troubleshooting
LG KU800
KB770 Keypad Backlight Troubleshooting
LG KB770
TracFone LG840G Main Keypad Backlight Troubleshooting
LG TracFone LG840G
CU920 Keypad Backlight Troubleshooting
LG CU920
L704I Keypad Backlight Troubleshooting
LG L704I
GM730 Keypad Backlight Troubleshooting
LG GM730
lg530g Main Keypad Backlight Troubleshooting
LG lg530g
CU575 Keypad Backlight Troubleshooting
LG CU575
CU720 Keypad Backlight Troubleshooting
LG CU720
CT815 Keypad Backlight Troubleshooting
LG CT815
GU280 Main Keypad Backlight Troubleshooting
LG GU280
CU400 Keypad Backlight Troubleshooting
LG CU400
GT810h Keypad Backlight Troubleshooting
LG GT810h
TU550 Keypad Backlight Troubleshooting
LG TU550
This manual is also suitable for:
Ku250
Table of Contents
Print
Rename the bookmark
Delete bookmark?
Delete from my manuals?
Login
Sign In
OR
Sign in with Facebook
Sign in with Google
Upload manual
Upload from disk
Upload from URL