LG -S310 Service Manual page 117

4. TROUBLE SHOOTING
4.14.3 FM Radio function has trouble without plugging Ear jack
- Please follow the below process
1. Check the FM Power Regulation and Supply voltage
2. Check the Clock
3. Check the signal path
4.14.3.1 Check the FM Power Regulation and Supply voltage
- Refer to 5.14.2.1
4.14.3.2 Check the Clock
- Refer to 5.14.2.2
4.14.3.3 Check the FM signal path
- FM has two signal path. One is for Earjack. The last is for FM intenna. On the section,
We deal with FM Intenna path.
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