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•Gopi - Logic. – 9.15am
•Budi - Camera - 9.30am
•Gary - Blue-tooth , Rotator -
10am

•Lee Ming - RX. 10.30am
•David - TX. 11am
•Leng - PM/P-Flex/Keypad
11.30am

•Pang - Audio 12pm
•AOB - 12.30pm

V80 Analyzing Training

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V80 Logic

26MHz Crystal

CKO = 52MHz
Testpoint

Neptune powersupply
Pins/bypass caps

Decoder IC, not used
For V80

PSRAM Mode Resistor

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V80 Memory U700

Flash Memory Size: 256Mbit
(24 address lines)
PSRAM Memory Size: 64Mbit
(22 address lines)

Flash and
PSRAM in a
single chip

High voltage
programming
test point. Can be
used
to check if the flash
is
getting power

R897 PSRAM Mode
Resistor. Without this
resistor, phone will
not turn on

C702, C703, C700,C701
Power supply bypass caps.
Vbuck = 1.87V

Two suppliers: Intel and STM

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Neptune Voltages

Signal Name

Typical Vdc

Cap to Probe

Comments

VDDA

2.775V

C806

VDD_CP

5V

C819

VDD1,2,3,4,RE

G_
BYP_CORE

1.875V

C810,C826,C8

27,C829

AVDD1 to 7

1.875V

C811,C812,C8

13

BVDD,CVDD,
DVDD, JVDD

2.775V

C815,C816,C8

17

FVDD

1.875V

LVDD

1.55V

C807

QVDD

1.875V

C814

VDD_TXRX

2.775V

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CKO Capture

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Neptune STANDBY Level shifter IC

U801 – Level shifter IC
Purpose: Shift the the input voltage
of 1.575V to an output voltage of
2.775V.
Neptune outputs the “STANDBY”
signal to PCAP.

1.575V

2.775V

2.775V

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V80 Testpoints

Short IO_REG and WDOG testpoints for No power up failure troubleshoot

Good Phone
Without shorting WDOG and IO_REG, WDOG must be at 2.775V at all times

2.775V

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Troubleshooting Tips

• The radio draws 40mA to 60mA of current when the

flash is blank (empty flash/ not programmed)

• A bricked phone will draw more current than a blank

flash phone

• When a phone bricks and if the IMEI is not

programmed, you can save the phone by using the
erase_rom.shx file

• If IMEI is already programmed and phone bricks,

replace the flash with a empty flash

• Place a short between WDOG and IO_REG before

starting a No power up troubleshooting