LG LG9200 Service Manual page 61

4. TROUBLE SHOOTING
Keypad Backlight Trouble (Qwerty Key) : (3)
1. EL backlight is not working
START
Power on and Open the
Contact at
OUT605,OUT608 is o k?
No
The vo lt age of KEY2
is about 2 .8V?
Yes
The vo lt age of OUT605 of OUT608
is 200V pp?
No
phone
Reco nnect
No
EL key p ad.
ABB is out of order.
No
Change the Bo ard .
Replace t he EL Keyp ad.
Yes
It is out of or der.
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Replace U602.
It is out of order.
Yes
The solde ring of
No
L601,Q602,C601,C602,U602
is ok?
Re-solde r
the compone nts