LG F1200 Service Manual page 57

4. TROUBLE SHOOTING
• Folder Trouble (On/Off)
The DBB (Calypso) is broken.
START
The all paths connected
to U300 are OK?
Yes
The V_IO is 2.8V?
Yes
Folder1 signal is low on
magnetizing into U300?
Yes
Change the board.
No
No
No
- 56 -
Resolder the C300,
C301, R300
Refer to Power On
Trouble.
Replace the U300.
U300 is broken.