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Manuals
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Cell Phone
F1200
Service manual
Speaker Trouble - LG F1200 Service Manual
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Also See for F1200
:
User manual
(288 pages)
,
Circuit diagrams
(7 pages)
,
User manual
(95 pages)
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Contents
Table of Contents
Troubleshooting
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Table of Contents
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4. TROUBLE SHOOTING
• Speaker Trouble
Soldering status of CN400 and
Check the Resistance
Check the Resistance between
C510 and C524 (C522 and C523)
Does Sinusoidal wave
appear at R520, R534?
Does Rectagular wave appear
at C510, C524 (and C522, C523)?
START
Speakers is OK?
YES
between +/— port of
speaker (Left, Right).
Is it about 8Ohm?
YES
Is it about 9Ohm?
YES
YES
YES
Replace the
Main PCB
Resolder the
NO
CN400
or Sfpeakers
NO
Replace the
speaker
NO
The Connection between
FPCB and Main Board is OK?
YES
Replace the
FPCB
NO
Replace the
Main PCB
NO
Check the voltage
level at C519 (or C520)
ls it 33V?
YES
Replace the
U50 (or U503)
- 46 -
NO
Reconnect the
FPCB Goto 3
NO
Replace the
U508
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Table of Contents
Troubleshooting
TROUBLE SHOOTING
39
Trouble Shooting of Receiver Part
65
Trouble Shooting Transmitter Part
74
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