LG KE990 Service Manual - Page 89
LG KE990 - LG Viewty Cell Phone 100 MB Manual
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4. TROUBLE SHOOTING START Check TP1 I f GSM over 31 dBm? If DCS/PCS over 28dBm? No Check TP2, TP3 I f TP2 over 29dBm? I f TP3 over 25dBm? No Yes GSM/DCS/PCS Tx is OK Check other par t Yes Check Fr ont-End M odul e Refer to chapter3.4 Check PAM Block OK? Refer to chapter3.5.3 Yes Check t he RTR6235 No Check Soldering of PAM(U101) If pr oblem still exist, replace the PAM Pr oblem resolved? No Change the Boar d Yes GSM/DCS/PCS Tx is OK LGE Internal Use Only - 90 - Copyright © 2008 LG Electronics. Inc. All right reserved. Only for training and service purposes
LGE Internal Use Only
Copyright © 2008 LG Electronics. Inc.
All right reserved.
Only for training and service purposes
4. TROUBLE SHOOTING
- 90 -
STAR
T
Check TP1
If GSM over 31 dBm?
If DCS
/PCS over 28dBm
?
Check TP2, TP3
If TP2 over 29dBm?
If TP3 over 25dBm
?
Check PAM Block OK?
Refer to chapter3.5.
3
Check Soldering of PAM (U101)
If problem still exist,
replace the PA
M
Change the Boar
d
Pr oblem resolved
?
Yes
Yes
Ye
s
Yes
No
No
No
N
o
GSM/DCS/PCS Tx is OK
Check other par
t
Check Front-End
Module
Refer to chapter
3.
4
Check the RTR623
5
GSM/DCS/PCS Tx is OK