LG HB620 Service Manual

4.5 Keypad backlight trouble
Key Pad Back Light is on as below :
Key pressing → PM6650 KYPD_LED_EN go to Low → LED On (Key Pad LED controlled by
PM6650)
LGE Internal Use Only Copyright © 2008 LG Electronics. Inc. All right reserved.
Only for training and service purposes
4. TROUBLE SHOOTING
- 81 -
Check device open :
LD501~ LD516
R511~ R520, R838, R839,R900~ R903
Start
Check device short :
LD501~ LD516
NO
Yes
Key press
Signal KYPD_LED_EN
is Low?
+VPWR is OK
?
Check the VA501
Change the main board
NO
O
Yes
Yes
NO
Some LED
is not work
?
Work well?
Ye
s
Change the Key FPCB
N
O
End
Check device open :
LD501~ LD516
R511~ R520, R83 8, R839,R900~ R903
Start
Check device short :
LD501~ LD516
NO
Yes
Key press
Signal KYPD_LED_EN
is Low?
+VPWR is OK
?
Check the VA501
Change the main board
NO
O
Yes
Yes
NO
Some LED
is not work
?
Work well?
Ye
s
Change the Key FPCB
N
O
End
Start
Check device short :
LD501~ LD516
NO
Yes
Key press
Signal KYPD_LED_EN
is Low?
+VPWR is OK
?
Check the VA501
Change the main board
NO
O
Yes
Yes
NO
Some LED
is not work
?
Work well?
Ye
s
Change the Key FPCB
N
O
End
47R516
R515 47
+VPWR
47R514
R511 47
LD503
SSC-TWH104-HLS SSC-TWH104-HLS
LD504 LD502
SSC-TWH104-HLS
SSC-TWH104-HLS
LD501
SSC-TWH104-HLS
LD509
SSC-TWH104-HLS
LD505
SSC-TWH104-HLS
LD510
EVL14S02200
VA501
47R517 47R512
SSC-TWH104-HLS
LD508 LD507
SSC-TWH104-HLS
LD506
SSC-TWH104-HLS
47R519
R520 47
SSC-TWH104-HLS
LD512
SSC-TWH104-HLS
LD511
R518 47
R903
47
R902 47 R901 47 R900 47
LD516
SSC-TWH104-HLS
LD515
SSC-TWH104-HLS
LD514
SSC-TWH104-HLS
LD513
SSC-TWH104-HLS
R839 47
R838 47
R513 47
KYPD_LED_EN
Z3X-BOX.COM

LG HB620 Specifications

General

Brand	LG
Model	HB620
Category	Cell Phone
Language	English