LG CG225 Service Manual page 74

1. Earpho ne detecti on problem
The Volt age
at HOOK_DETECT point
is 0V?
Yes
2. Send ing Pat h problem
The vo ltage at L201
is 0. 99V ~ 1.03V?
Yes
A fe w
tens or h undreds
of mV of signa ls at C254
are measur ed ?
Yes
The ABB is out of order.
Change th e board.
No
Soldering
Of C250, R225 is OK?
Yes
Pin3 an d Pin4 of CN201
are ope n?
Yes
The ABB is out of order.
Change th e board.
Set audio part of the test
equipment to the echo mode.
No
Re_sold er the
R222, R221
The
No
solder ing of C 254
is O K?
Yes
The
solderin g of CN20 1
is O K?
Yes
The earphone is O K?
Yes
The ABB is out of order.
Change th e board.
- 73 -
4. TROUBLE SHOOTING
No
Re_sold er the
C250, R225
No
Change the CN201