Checking Wlan Block; Only For Training And Service Purposes - LG KS20 Operating Instructions Manual

4.9 Checking WLAN Block

KS20 WLAN initial power sequence is :
WLAN_PWD controlled by MSM7200 GPIO goes to high (2.6V), SYS_RST_L in the WLAN module
goes to low by inverting WLAN_PWD signals -> WLAN_PWR_ON controlled by MSM7200 GPIO goes
to high (2.6V) ◊ VWLAN_3.3V goes to 3.3V first ◊ VWLAN_2.6V and VWLAN_1.8V go to 2.6V and
1.8V, respectively. -> WLAN_PWD is low, and SYS_RST_L is high after all WLAN power signals go on
KS20 WLAN initial operation is :
32KHZ_ON controlled by MSM7200 GPIO goes to low for turning on sleep clock oscillator -> A WLAN
32.768 kHz sleep clock starts to operate -> WLAN power goes to high -> WLAN module scans access
points for network access, for which RF parts in the module start to operate -> After association
process to the wireless network in the KS20 set, users can use Wireless LAN.
Check WLAN antenna in the Key FPCB
RF cable is connected?
Check Sleep Clock in the R632
Check WLAN power in the C610 (1.8V),
611 (3.3V), and 613 (2.6V)
Check WLAN_PWD and SYS_RST_L
power sequence in the R651 and C624.
Change the Sub board
Copyright © 2007 LG Electronics. Inc. All right reserved.

Only for training and service purposes

Start
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4. TROUBLE SHOOTING
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Change Key FPCB or
Connect RF cable to RF switch
Check X600 sleep clock oscillator
Check U600 for 1.8V, and U601 for
3.3V, and U605 for 2.6V
Check Q603 inverter
LGE Internal Use Only