LG CG225 Service Manual page 60

4.9.2. Speaker(MIDI) Trouble
START
Paths o f U201
sig nals are O K?
Yes
Does sin e wave appear
at R208
Yes
Does si ne w ave appear
at L401,L402?
Yes
Connectio n
betw een FPCB and
CN401 is OK?
Yes
Soldering betw een
spea ker and board
is O K?
Yes
Cables of SPK
are OK?
Yes
Speak er(MIDI) OK
Enter into Engineering Mode and
go to menu "Baseband
No
Change the boa rd
No
Change the U201
No
SPK_EN signa l is high?
Yes
Change t he U205
Reconne ct
FPCB to
No
CN401
No
Re_sold er
Cable s
No
Change
the SPK
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4. TROUBLE SHOOTING
SPK_EN Operating
0 Receiv er On ly
1 MIDI or SPK mode
Alert Ring"
No
ABB is out of order.
Change the boa rd.