LG KU580 Service Manual - Page 122
Checking VCC
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4. TROUBLE SHOOTING 4.15.4 Checking VCC R607 (VDD_E) AB3000 R605 (VDD_A) (Bottom) Figure 4-9-1. Power for Radio ASIC ➃ VDDD_1V5 R605 1% 0 VRADA_2V75 (RF3000, RF3100 analog, Power Detector) R606 1% 0 R607 1% 0 G4 ADSTR B9 ADOUT C8 VDDADC C12 VDD_A B11 EXTLDO AB3000 F12 VDD_D D12 VDD_E A11 VDD C C601 C602 C603 1u 1u 2.2u VDIGRAD_1V8 (RF3000, RF3100 digital) R608 1% 0 Figure 4-9-2. Schematic (Power) Check Point VDD_A (R605) 2.75V OK? Yes Check the Vincenne2 No Check Point VDD_E (R607) 1.8V OK? No Yes Common Input Power is OK See The Next Part Check the Vincenne2 Copyright © 2007 LG Electronics. Inc. All right reserved. Only for training and service purposes - 123 - LGE Internal Use Only
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- 123 -
LGE Internal Use Only
Copyright © 2007 LG Electronics. Inc.
All right reserved.
Only for training and service purposes
4. TROUBLE SHOOTING
4.15.4 Checking VCC
(Bottom)
AB3000
R605 (VDD_A)
R607 (VDD_E)
Figure 4-9-1. Power for Radio ASIC
➃
Figure 4-9-2. Schematic (Power)
VRADA_2V75 (RF3000, RF3100 analog, Power Detector)
AB3000
1%
1%
1%
1%
VDDD_1V5
1u
2.2u
C603
C601
VDD_D
VDD_E
D12
C8
VDDADC
C12
VDD_A
A11
VDD C
F12
EXTLDO
B11
B9
ADOUT
G4
ADSTR
C602
1u
0
R608
0
R605
R607
0
0
R606
VDIGRAD_1V8 (RF3000, RF3100 digital)
2.75V
OK?
No
Yes
1.8V OK?
Yes
No
Check the Vincenne2
Check the Vincenne2
Check Point
VDD_E (R607)
Common Input Power is OK
See The Next Part
Check Point
VDD_A (R605)