Checking Ldo Circuit - LG T5100 Service Manual
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- User manual (121 pages) ,
- User manual (233 pages) ,
- User manual (249 pages)
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4. RF PART TROUBLESHOOTING
4.2.1 Checking LDO Circuit
Checking Points
Checking Flow
Pin 5 : RF2.85V
No
U100 is out of order.
Pin3?
change the board
Yes
U704
No
Replace U704
Pin5?
Pin 3 : RF_EN
Yes
Figure 49. LDO
Redownload
The phone
S/W
LDO Circuit Diagram
Waveform
Figure 50. LDO Circuit
Figure 51. LDO Waveform
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Troubleshooting
