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4. TROUBLE SHOOTING
4.16.2 Step 2
VBATI
(R407)
Check VBATI (R407)
in GSM PAM Block
to Check if main power
source input or not
Check FL401
to check if power
source input or not
Check FL401 & R407
inner Line connection
Check Point (C740)
in Power Source Block
To Check Power source
Check (C740 & R105)
in Block
to check inner line connection
From C740 to R105
➁
GSM PAM
(Top)
Figure 4-16-4. Step 2 :GSM PAM Block
Step 2
3.7V
➁
OK?
Yes
See The Step 3
3.7V
OK?
Yes
Short ?
Yes
Change FL401
➄
➀➄
Soldering Check Component
In Power Source Block
- 136 -
➁
No
No
No
Change Board
No
3.7V OK?
Yes
No
Short?
Yes
(R847 & R875)
➄
FL401
Check The PowerSupply
Change Board
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