5-4 Troubleshooting Charts: Power-Up Failure
5.3 Power-Up Failure – VOCON Board
VOCON Board Power Up
Problem
Measure Voltage
at R6505
6 < V < 9?
Proceed to
Incorrect B+
Voltage Flow
Chart
Measure Voltage
at R6542
3.3 < V < 3.9
Proceed to Low
VCC_SW_3.6
Flow Chart
Use Oscilloscope
to Measure R6572
Freq = 24MHz
1.6 < V < 1.9
Inspect Y6501 and
All supporting
Circuitry
Repair or Replace
Part/s
Replace VOCON
Board
Are Parts Solder
Connections and
Placement Correct
No
Yes
Measure All Probe
Spots from Above
Table
Voltages =
Level
Proceed to
Specified Flow
Chart in Table
Measure Voltage
at R6203
1.6 < V < 1.9
Replace VOCON
Board
No
Yes
No
Yes
No
Yes
No Yes
No
Use Oscilloscope
to Measure R6115
Yes
Freq = 32kHz
1.6 < V < 1.9
Replace VOCON
Board
Use Oscilloscope
and High
Impedance Probe
to Measure
C6602
Freq = 12MHz
1.3 < V < 1.9
Inspect Y6601
Circuit
Repair or Replace
Part/s
Are Parts Solder
Connections and
Placement Correct
No
Yes
No
Yes
No
Measure Voltage
at R2217
Yes
1.6 < V < 1.9
OMAP is Out of
Reset, Proceed to
Memory Flow
Chart
Yes
Replace VOCON
No
Name Ref Description Level V Flow Chart
VCC_1.875 C4001 LDO Output 1.875±10% Refer to note 1
VCC_1.55 R6561 LDO Output 1.55±10% Low LDO3 VCC_1.55 Voltage
VCC_2.775D R4011 LDO Output 2.775±10% Low LDO10 VCC_3.3 Voltage
VCC_2.775 R6563 LDO Output 2.775±10% Low LDO10 VCC_3.3 Voltage
VCC_2.8 R6564 LDO Output 2.8±10% Low LDO10 VCC_3.3 Voltage
VCC_5.0A R6565 LDO Output 5.0±10% Low LDO8 VCC_5.0A Voltage
VCC_3.3 R6566 LDO Output 3.3±10% Low LDO10 VCC_3.3 Voltage
VCC_3.0A R6567 LDO Output 3.0±10% Low LDO10 VCC_3.3 Voltage
VCC_SW_3.6 C6561 Switching Output 3.6±10% Low VCC_SW_3.6 Voltage
VCC_1.85 R6570 LDO Output 1.85±10% Low VCC_1.85 Voltage
VCC_SW_1.4 E6502 Switching Output 1.4±10% Low VCC_SW_1.4 Voltage
Note:
1. Probe C4001 and observe 1.875 V. If absent then return board to depot for repair.
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