LG X-SHOT LDC-A310 User manual

-1 -
SERVICE MANUAL
Digital Camera
3. OUTLINE OF CIRCUIT DESCRIPTION .................... 5
4. DISASSEMBLY ........................................................ 13
1. SPECFICATION ........................................................ 2
2. LOCATION OF CUSTOMER CONTROLS ................ 4
5. ELECTRICAL ADJUSTMENT .................................. 15
6. USB STORAGE INFORMATION
REGISTRATION ...................................................... 20
7. TROUBLESHOOTING GUIDE................................. 21
8. E PLODED VIEW ................................................... 23
CABINET AND CHASSIS PARTS ........................... 27
ELECTRICAL PARTS .............................................. 28
ACCESSORIES PART ............................................ 29
CIRCUIT DIAGRAMS &
PRINTED WIRING BOARDS ................................... 30
The components designated by a symbol ( ! ) in this schematic diagram designates components whose value are of
special significance to product safety. Should any component designated by a symbol need to be replaced, use only the part
designated in the Parts List. Do not deviate from the resistance, wattage, and voltage ratings shown.
CAUTION : Danger of explosion if battery is incorrectly replaced.
Replace only with the same or equivalent type recommended by the manufacturer.
Discard used batteries according to the manufacturer’s instructions.
NOTE : 1. Parts order must contain model number, part number, and description.
2. Substitute parts may be supplied as the service parts.
3. N. S. P. : Not available as service parts.
Design and specification are subject to change without notice.

-2 -
1. SPECFICATION

-3 -

-4 -
Rear
Front
2. LOCATION OF CUSTOMER CONTROLS

-5 -
3. OUTLINE OF CIRCUIT DESCRIPTION
3-1. CP1 CIRCUIT DESCRIPTION
1. IC Configuration
IC903 (IC 432JQ) CCD imager
IC904 (C D3440EN) V driver
IC905 H driver, CDS, PGA and A/D converter
(HD49335NP01)
2. IC903 (CCD imager)
[Structure]
Interline type CCD image sensor
Image size Diagonal 6.67 mm (1/2.7 type)
Pixels in total 2140 (H) x 1560 (V)
Recording pixels 2064 (H) x 1541 (V)
Fig. 1-1. CCD Block Diagram
Pin No.
1
Symbol
2, 3
8, 7, 4
5, 6
9, 13
10
11
12
17
18
Vø6
Vø1, Vø2, Vø4
Vø3A, Vø3B
GND
VOUT
VDD
øRG
Hø2
Hø1
Pin Description
Vertical register transfer clock
Vertical register transfer clock
Vertical register transfer clock
Vertical register transfer clock
Horizontal register transfer clock
Reset gate clock
Horizontal register transfer clock
GND
Signal output
Circuit power
Waveform
DC
Voltage
-7.5 V, 0 V
-7.5 V, 0 V, 15 V
-7.5 V, 0 V
-7.5 V, 0 V, 15 V
15 V
0 V, 3.0 V
0 V, 3.0 V
Table 3-1. CCD Pin Description
GND 0 V
Aprox. 10 V
13.0 V, 16 V
When sensor read-out
Vø5A, Vø5B
(Note)
(Note) : Photo sensor
81
16 17 18
2
3
4
5
6
7
13 14 15
Gb B
R
Gb
R
Gb
Gr
B
Gr
BB
Gr
B
Gr
R
Gb
R
Gb
Gb B
RGr RGr
9
10 12
11
V
DD
GND
C
SUB
V
L
GND
V
OUT
Gb
R
B
Gr
Gb
R
B
Gr
Horizontal register
Vertical register
14
15
16
CSUB
VL
Substrate bias
Substrate clock
Protection transistor bias DC
øSUB
DC
Approx. 9 V
DC
Approx. 9 V
(Different from every CCD)

-6 -
Fig. 1-2. IC905 Block Diagram
3. IC904 (V Driver)
V driver is necessary in order to generate the clocks (vertical
transfer clock, horizontal transfer clock and electronic shutter
clock) which driver the CCD.
IC904 is V driver. In addition the V1- V4 signals which are
output from IC101 are the vertical transfer clocks, and the
SG signal which is output from IC102 is superimposed onto
V1 and V3 at IC904 in order to generate a ternary pulse.
In addition, the SUB signal which is output from IC101 is
used as the sweep pulse for the electronic shutter.
4. IC905 (CDS, PGA, A/D Converter and H driver)
The video signal which is output from the CCD is input to Pin
(51) of IC905. There are inside the CDS block, PGA block
and A/D converter block.
The setting of sampling phase and PGA is carried out by se-
rial data at Pin (63) of IC935. The video signal is carried out
A/D converter, and is output by 10-bit. A H driver is inside
IC905, and H1, H2 and RG clock are generated at IC905.
5. Lens drive block
5-1. Iris drive
When the drive signals (IIN+ and IIN–) which are output from
the ASIC (IC101), it is driven by the driver (IC951), and are
then used to drive the iris steps.
5-2. Focus drive
When the drive signals (FIN_A, FIN_-A, FIN_B and FIN_-B)
which are output from the ASIC expansion I/O port (IC105),
the focus stepping motor is driven by the driver (IC951). De-
tection of the standard focusing positions is carried out by
means of the photointerruptor (FOCUS PI) inside the lens block.
5-3. Zoom drive
When the drive signals (ZIN+ and ZIN–) which are output from
the ASIC (IC101), the zoom motor is driven by the driver
(IC951). Detection of the standard zoom positions is carried
out by means of photointerruptor (ZOOM PI and PI2) inside
the lens block.
5-4. Shutter drive
When the drive signals (SIN+ and SIN–) which are output from
the ASIC (IC101), it is driven regular current by the driver
(IC951).
VRB
D9
D8
D7
D6
D5
D4
D3
D2
D1
D0
Reset
DV SS
AV SS
VRM
VRT
BIAS
CDS_CS
SDATA
SCK
DLL_C
MON
ID
BLKFB
BLKC
BLKSH
CDS_in
ADC_in
DRDVDD
DVDD
AVDD
CLK_in
HD_in
VD_in
RG
H1A
H2A
TIMING
generator
Serial
interface
Bias
genera-
tion
DC offset
compensation
ciruit
10 bit
ADC
PGA
CDS
PBLK
CPDM
CPOB
ADCK
SP2
SP1
Output latch circuit

-7 -
6. Circuit Description
6-1. Digital clamp
The optical black section of the CCD extracts averaged val-
ues from the subsequent data to make the black level of the
CCD output data uniform for each line. The optical black sec-
tion of the CCD averaged value for each line is taken as the
sum of the value for the previous line multiplied by the coeffi-
cient k and the value for the current line multiplied by the
coefficient 1-k.
6-2. Signal processor
1.  correction circuit
This circuit performs (gamma) correction in order to maintain
a linear relationship between the light input to the camera
and the light output from the picture screen.
2. Color generation circuit
This circuit converts the CCD data into RGB signals.
3. Matrix circuit
This circuit generates the Y signals, R-Y signals and B-Y sig-
nals from the RGB signals.
4. Horizontal and vertical aperture circuit
This circuit is used gemerate the aperture signal.
6-3. AE/AWB and AF computing circuit
The AE/AWB carries out computation based on a 64-segment
screen, and the AF carries out computations based on a 6-
segment screen.
6-4. SDRAM controller
This circuit outputs address, RAS, CAS and AS data for con-
trolling the SDRAM. It also refreshes the SDRAM.
6-5. Communication control
1. SIO
This is the interface for the 8-bit microprocessor.
2. PIO/PWM/SIO for LCD
8-bit parallel input and output makes it possible to switch be-
tween individual input/output and PWM input/output.
6-6. TG/SG
Timing generated for 3 million pixel CCD control.
6-7. Digital encorder
It generates chroma signal from color difference signal.
7. Outline of Operation
When the shutter opens, the reset signals (ASIC and CPU)
and the serial signals (“take a picture” commands) from the
8-bit microprocessor are input and operation starts.
When the TG/SG drives the CCD, picture data passes through
the A/D and CDS, and is then input to the ASIC as 10-bit
data. The AF, AE, AWB, shutter, and AGC value are com-
puted from this data, and three exposures are made to obtain
the optimum picture. The data which has already been stored
in the SDRAM is read by the CPU and color generation is
carried out. Each pixel is interpolated from the surrounding
data as being either Ye, Cy, Mg or B primary color data to
produce R, G and B data. At this time, correction of the lens
distortion which is a characteristic of wide-angle lenses is
carried out. After AWB and processing are carried out, a
matrix is generated and aperture correction is carried out for
the Y signal, and the data is then compressed by JPEG and
is then written to card memory (SD card).
When the data is to be output to an external device, it is taken
data from the memory and output via the USB I/F. When played
back on the LCD and monitor, data is transferred from memery
to the SDRAM, and the image is then elongated so that it is
displayed over the SDRAM display area.
8. LCD Block
LCD block is in the CP1 board, and it is constructed by VCOM
gerenated circuit etc. The video signal from the ASIC are in-
put to LCD panel directly by 6-bit digital signal, and are con-
verted into RGB signals by driver circuit in the LCD panel.
Because the LCD closes more as the difference in potential
between the VCOM (common polar voltage: AC) and the R,
G and B signals becomes greater, the display becomes darker;
if the difference inpotential is smaller, the element opens and
the LCD becomes brighter. And also timing pulse except video
signal are input at LCD panel directly from ASIC.

-8 -
3-2. CP1 POWER CIRCUIT DESCRIPTION
1. Outline
This is the main power circuit, and is comprised of the follow-
ing blocks.
Switching power controller (IC501)
Analog system power output (Q5001, T5001)
Digital 1.8 V power output (Q5009, L5006)
Digital 3.3 V power output (Q5002, L5004)
LCD 15 V system power output (Q5010, L5007)
LCD 5 V power output (IC502)
LED backlight power output (Q5013, L5008)
3.6 V lens system power output (IC955, Q9551, L9551)
2. Switching Controller
This is the basic circuit which is necessary for controlling the
power supply for a PWM-type switching regulator, and is pro-
vided with five built-in channels, only CH1 (analog system
power output), CH2 (digital 3.3 V system power output), CH3
(digital 1.8 V system power output), CH4 (LCD 15 V system
power output) and CH5 (LED back light power output) are
used. Feedback from 15.0 V (A) (CH1), 3.3 V (D) (CH2), 1.8
V (D) (CH3), 15 V B (CH4) and LED backlight output (CH5)
are received, and the PWM duty is varied so that each one is
maintained at the correct voltage setting level.
2-1. Short-circuit Protection
If output is short-circuited for the length of time determined
by the condenser which is connected to Pin (37) of IC501, all
output is turned off. The control signal (P ON) are recontrolled
to restore output.
3. Analog System Power Output
15.0 V (A), -7.6 V (A) and 3.05 V (A) are output. Feedback for
the 15.0 V (A) is provided to the switching controller (Pin (40)
of IC501) so that PWM control can be carried out.
4. Digital 1.8 V Power Output
1.8 V (D) is output. Feedback for the 1.8 V (D) is provided to
the switching controller (Pins (45) of IC501) so that PWM con-
trol can be carried out.
5. Digital 3.3 V Power Output
3.3 V (D) is output. Feedback for the 3.3 V (D) is provided to
the swiching controller (Pin (43) of IC501) so that PWM con-
trol can be carried out.
6. LCD 15 V System Power Output
LCD 15 V (L) and buzzer 15 V B are output. Feedback for the
15 V B is provided to the swiching controller (Pin (47) of IC501)
so that PWM control can be carried out.
7. LCD 5 V Power Output
5 V (L) is output. 5 V (L) is output for regulated 15 V B at
IC502.
8. LED Backlight Power Output
A constant current flows to the backlight LEDs. Feedback for
the voltage of R5063 is provided to the power controller (Pin
(2) of IC501) so that PWM control can be carried out.
9. 3.6 V Lens System Power Output
Lens power 3.6 V is output. Feedback for the lens 3.6 V is
provided to the swiching controller (Pin (1) of IC955) so that
PWM control can be carried out.

-9 -
3-3. CP1 STROBE CIRCUIT DESCRIPTION
1. Charging Circuit
When UNREG power is supplied to the charge circuit and the
CHG signal from microprocessor becomes High (3.3 V), the
charging circuit starts operating and the main electorolytic
capacitor is charged with high-voltage direct current.
However, when the CHG signal is Low (0 V), the charging
circuit does not operate.
1-1. Power switch
When the CHG signal switches to Hi, Q5407 turns ON and
the charging circuit starts operating.
1-2. Power supply filter
C5401 constitutes the power supply filter. They smooth out
ripples in the current which accompany the switching of the
oscillation transformer.
1-3. Oscillation circuit
This circuit generates an AC voltage (pulse) in order to in-
crease the UNREG power supply voltage when drops in cur-
rent occur. This circuit generates a drive pulse with a frequency
of approximately 50-100 kHz. Because self-excited light omis-
sion is used, the oscillation frequency changes according to
the drive conditions.
1-4. Oscillation transformer
The low-voltage alternating current which is generated by the
oscillation control circuit is converted to a high-voltage alter-
nating current by the oscillation transformer.
1-5. Rectifier circuit
The high-voltage alternating current which is generated at
the secondary side of T5401 is rectified to produce a high-
voltage direct current and is accumulated at electrolytic ca-
pacitor C5412.
1-6. Voltage monitoring circuit
This circuit is used to maintain the voltage accumulated at
C5512 at a constance level.
After the charging voltage is divided and converted to a lower
voltage by R5417, R5419 and R5420, it is output to the mi-
croprocessor as the monitoring voltage VMONIT. When this
VMONIT voltage reaches a specified level at the micropro-
cessor, the CHG signal is switched to Low and charging is
interrupted.
2. Light Emission Circuit
When RDY and TRIG signals are input from the ASIC expan-
sion port, the stroboscope emits light.
2-1. Emission control circuit
When the RDY signal is input to the emission control circuit,
Q5409 switches on and preparation is made to let current
flow to the light emitting element. Moreover, when a STOP
signal is input, the stroboscope stops emitting light.
2-2. Trigger circuit
When a TRIG signal is input to the trigger circuit, D5405
switches on, a high-voltage pulse of several kilovolts is gen-
erated inside the trigger circuit, and this pulse is then applied
to the light emitting part.
2-3. Light emitting element
When the high-voltage pulse form the trigger circuit is ap-
plied to the light emitting part, currnet flows to the light emit-
ting element and light is emitted.
Beware of electric shocks.

-10 -
47 /DC_IN I
See next page
3-4. SYA CIRCUIT DESCRIPTION
1. Configuration and Functions
For the overall configuration of the SYA block, refer to the block diagram. The SYA block centers around a 8-bit microprocessor
(IC301), and controls camera system condition (mode).
The 8-bit microprocessor handles the following functions.
1. Operation key input, 2. Clock control and backup, 3. Power ON/OFF, 4. Storobe charge control, 5. Signal input and output for
zoom and lens control.
Pin Signal
1~4
5
6
7
8
9
10
11
12
14
15
16
17
18
19
20
21
22
23
30
32
33
34
35
36
37
38
39
40
41
42
43
45
44
46
/SCAN OUT 0~3
P ON
PA O N
BL_ON
LCD_ON
VSS
VDD
/SELF LED
/STBY_LED (GREEN)
/AVREF_ON
SI
SO
SCK
PRG SI
PRG SO
PRG SCK
NOT USED
NOT USED
CHG ON
NOT USED
CHG VOL
BATTERY
AVREF
AVDD
/RESET
COUT
CIN
IC
OUT
IN
VSS
/BAT OFF
/SREQ
/SCAN IN3
SUB 1
I/O
O
O
O
O
O
-
-
O
O
O
I
O
I/O
I
O
I/O
-
-
O
-
I
I
-
-
I
O
I
I
O
I
-
I
I
I
I
Outline
Key scan output
Digital power ON/OFF control H : ON
Analog power ON/OFF control H : ON
LCD backlight ON/OFF control H : ON
LCD power ON/OFF control H : ON
GND
VDD
Stand-by LED (green) control L : ON
A/D converter standard voltage control L : ON
Receiving data (from ASIC)
Sending data (to ASIC)
Communication clock (to ASIC)
Flash memory writing receiving data
Flash memory writing sending data
Flash memory writing communication clock
-
-
-
Storobe charge voltage detection (analog input)
Battery voltage detection (analog input)
Analog standard voltage input terminal
A/D converter analog power terminal
Reset input
Clock oscillation terminal (37.768 kHz)
Clock oscillation terminal
Flash memory writing voltage
Main clock oscillation terminal (4MHz)
Main clock oscillation terminal
GND
Battery OFF detection
Serial communication requirement (from ASIC)
Key scan input 6
Command input (from ASIC)
DC jack/battery detection input
Flash charge control H : ON
13 /STBY_LED (RED) OStand-by LED (red) control L : ON
24 VDD -VDD
25 AVSS -AVSS
27~29 SCAN IN 0~2 IKey scan input
Self LED (red) control L : ON
31 NOT USED --
26 NOT USED --

-11 -

-12 -

-13 -
4
4. DISASSEMBLY

-14 -
4

-15 -
5. ELECTRICAL ADJUSTMENT

-16 -

-17 -

-18 -

-19 -

-20 -
6. USB STORAGE INFORMATION REGISTRATION