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4. TROUBLE SHOOTING
4.16.5 Checking Regular Part
V_ wi vi_B
(N1700)
V_ wi vi_A
(N1700)
.
.
or
Check Poin t
or
(R1825)
(R1826)
To Check Reg ulator
Out put Vol tage
Regulator Circuit is OK,
See the next Page
LP3981ILD-2.8
Reg ulat or
Figure 4-9. Regulator Block
Figure 4-10. Regular Circuit Diagram
No
2.8V OK ?
Yes
No
?
Point
High
Yes
Change The Regulator
- 136 -
EXTLDO
( R1851)
Change the Board
Check EX TLOD
.
Point
To Check
regulator e nable
signal
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Troubleshooting
