LG KE990 Service Manual - Page 86
Check Sol, dering, ANT_SEL0, 1 High Level, 5V < Voltgae < 3.0V, Check VDD, TP3 VREG_RF_SMPS,
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4. TROUBLE SHOOTING Checking Switch Block power source Check Sodl ering ANT_SEL0, 1 High Level 2.5V < Voltgae < 3.0V NO YES Check the Logic in each mode Check VDD TP3 VREG_RF_SMPS Copyright © 2008 LG Electronics. Inc. All right reserved. Only for training and service purposes - 87 - LGE Internal Use Only
- 87 -
4. TROUBLE SHOOTING
Checking Switch Block power source
LGE Internal Use Only
Copyright © 2008 LG Electronics. Inc.
All right reserved.
Only for training and service purposes
Check Sol
dering
ANT_SEL0, 1 High Level
2.5V < Voltgae < 3.0V
Check VDD
TP3 VREG_RF_SMPS
Check the Logic
in each mo
de
YES
NO