akira LCT-32HSSTP User manual

LCT TV
Service Manual

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Model No.: LCT-32HSSTP
Version: 1.0
MODEL:
LCT-32HSSTP

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Model No.: LCT-32HSSTP
Version: 1.0
CONTENTS
SAFE PRECAUTION .............................................................................................................................. 4
BLOCK DIAGRAM ................................................................................................................................ 5
FUNCTION OF CONJUNCTION........................................................................................................... 6
SIGNAL DIAGRAM ............................................................................................................................... 9
POWER DIAGRAM.............................................................................................................................. 10
TROUBLESHOOTING ......................................................................................................................... 11
WALL-MOUNTING BRACKET INSTALLATION GUIDE................................................................ 14
CIRCUIT DIAGRAM............................................................................................................................ 17
PART LIST............................................................................................................................................. 26

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Model No.: LCT-32HSSTP
Version: 1.0
SAFETY PRECAUTION
WARNING:
Service should not be attempted by anyone unfamiliar with the necessary precaution on this receiver.
The following are the necessary precautions to be observed before servicing this chassis.
1. When replacing a chassis in the cabinet, always be certain that all the protective devices are put
back in place, such as: non-metallic control knobs, insulating covers, shields, isolation
resistor-capacitor network etc.
2. When replacing parts or circuit boards, disconnect the power cord.
3. When replacing a high wattage resistor (oxide metal film resistor) on the circuit board, keep the
resistor 10mm (1/2in) away from circuit board.
4. Connection wires must be kept away from components with high voltage or high temperature.
5. If any fuse in this TV receiver is blown, replace it with the FUSE specified in the chassis parts list.
PRODUCT SAFETY NOTICE
Many electrical and mechanical parts in the chassis have special safety-related characteristics.
These characteristics are often passed unnoticed by a visual inspection.
Replacement parts, which have these special safety characteristics are identified in this manual and its
supplement electrical components having such features are shaded on the schematic diagram and the
parts list.
Before replacing any of these components, read the parts list in this manual carefully. The use of
substitute replacement parts which do not have the same characteristic as specified in the parts list may
create shock, fire or other hazards.

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Model No.: LCT-32HSSTP
Version: 1.0
BLOCK DIAGRAM
P40 CN801
CN904
CN902
MAIN BOARD
CN901
CN903
XP501 XP511
POWER BOARD
XP4
XP7 XP3
TUNNER BOARD
XP2
XP8
XP1
XP301
KEY BOARD
PANEL

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Model No.: LCT-32HSSTP
Version: 1.0
FUNCTION OF CONJUNCTION
CN801---XP501
ITEM NAME FUNCTION
1 5V FOR PANEL POWER
2 PS FOR POWER OFF
3 GND GND
4 14V FOR AUDIO POWER
5 PGND AUDIO GND
6 12V FOR MAIN POWER
7 12V FOR MAIN POWER
8 GND FOR MAIN GND
9 GND FOR MAIN GND
CN902---XP4
ITEM NAME FUNCTION
1 GND FOR AUDIO GND
2 14V FOR AUDIO POWER
3 14V FOR AUDIO POWER
4 GND FOR AUDIO GND
5 12V FOR AUDIO POWER
6 GND FOR AUDIO GND
7 5.0V TUNNER POWER
CN901---XP2
ITEM NAME FUNCTION
1 ADC1 FOR SCART1 AUTO IDENTIFY
2 ADC2 FOR SCART1 AUTO IDENTIFY
3 GND GND
4 MUTE AUDIO MUTE
5 RESET MSP3410 RESET
6 GND GND
7 SDA FOR SERIAL DATA
8 SCL FOR SERIAL CLOCK

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Model No.: LCT-32HSSTP
Version: 1.0
CN901---XP2
ITEM NAME FUNCTION
1 GND GND
2 CVBS FOR TV'S CVBS SIGNAL
3 GND GND
4 GREEN FOR SCART GREEN
5 GND GND
6 RED FOR SCART RED
7 GND GND
8 FB FOR FAST BLANK
9 GND GND
10 BLUE FOR SCART BLUE
11 GND GDN
12 AVOUT FOR MONITOR OUT
CN903---XP1
ITEM NAME FUNCTION
1 AV1-IN FOR VIDEO1 IN
2 GND GND
3 AV2-IN FOR VIDEO2 IN
4 GND GND
5 S-CIN FOR C-IN
6 GND GND

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Model No.: LCT-32HSSTP
Version: 1.0
P40
ITEM NAME FUNCTION
1 PWM PWM Dimming
2 APWM Analog PWM dimming
3 ON/OFF Backlight On~Off: 2.4-5.0V On
0-1V Off
4 GND
5 RX0- LVDS signal
6 RX0+ LVDS signal
7 GND
8 RX1- LVDS signal
9 RX1+ LVDS signal
10 GND
11 RX2- LVDS signal
12 RX2+ LVDS signal
13 GND
14 RCLK- LVDS clock signal
15 RCLK+ LVDS clock signal
16 GND
17 RX3- LVDS signal
18 RX3+ LVDS signal
19 GND
20 N.C.
21 N.C.
22 N.C.
23 GND
24 GND
25 GND
26 Panel_power Module power
27 Panel_power Module power
28 Panel_power Module power
29 Panel_power Module power
30 Inverter_power Inverter logic power

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Model No.: LCT-32HSSTP
Version: 1.0
SIGNAL DIAGRAM
A1
TUNER
N1
MSP3410
N4
TDA7266B
N5
LM358
U400
VPC3230
U500
GM1501 PANEL
U702
PI5V330
SPEAKER
SPEAKER
EARPHONE
U703
SDA5550M
SCART1
SCART2
U401
PI5V330
DV1
VGA
YPBP

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Model No.: LCT-32HSSTP
Version: 1.0
POWER DIAGRAM
CN801
1
2
3
4
5
6
7
8
12V
U800
LM2576
9
GND
GND
PGND
U802
LM1086
U801
LT1117-3.3
U810
LT1117-3.3
U805
LT1117-2.5
14V
GND
+5V
U902
IRF7314
5V
U806
SW
1
2
3
4
5
6
7
GND
GND
GND
GND
120V
120V
120V
Panel_power
Inverter_logic_power
U901
LM7809
LCD
12V
N301
TDA7266B
N302
CD4052
N303
NJW1137
N304
LM358
14V
9V
U803
LT1117-1.8 U500
GM1501 U400 VPC3230
U600
K4D263238 U903 AM29LV040
Main board

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Model No.: LCT-32HSSTP
Version: 1.0
TROUBLESHOOTING
NO PICTURE
CN801
PIN6:12V
FB703
PIN1:5V
U802
PIN2:3.3V
REPLACE
U802
REPLACE
POWER BOARD
U806
PIN5
,
6
,
7
,
8:5
REPLACE
U806
REPLACE
U800
REPLACE
U801ORU803ORU8
05OR810
U402
PIN5,6(5V)
PI
N7,8(3.3V)
REPLACE
U402
U801(3.3V) U803(1.8V)
U805(2.5V) U810(3.3V)
REPLACE
U402
OK
NO
YES
YES
NO
YES
YES
YES
FB400(5V)FB401(3.3)
FB402(5V)FB403(5V)FB
404(3.3V)FB405(3.3)
YES
NO
NO
NO
NO
NO
YES

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Model No.: LCT-32HSSTP
Version: 1.0
NO TELETEXT
U809(2.5V) REPLACE
U809
REPLACE
FB409FB410FB411FB412
FB409(3.3V)FB410
(2.5V)FB411(3.3V)
FB412
(
3.3V
)
REPLACEU70
3
,
U704
,
U706
YES
YES
YES
N
O
N
O

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Model No.: LCT-32HSSTP
Version: 1.0
NO SOUND
A1
PIN4
N1 PIN27,
PIN28
REPLACE
A1
REPLACE
N1
N4 PIN1, PIN2,
PIN4, PIN5
REPLACE
N4 OK
N4
PIN7(4.5)
CHECK
V3
V4
YES
YES
YES
YES
NO
NO
NO
NO

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Model No.: LCT-32HSSTP
Version: 1.0
WALL-MOUNTING BRACKET INSTALLATION GUIDE
READ CAREFULLY BEFORE INSTALLATION!
THE INSTALLATION GUIDE SHOULD BE RETAINED FOR FUTURE REFERENCE.
Caution:
1. Do NOT attempt to install the TV by yourself to avoid mistakes or hazard. Refer all installation to
qualified servicing personnel.
2. DO NOT install the TV on a wall aslope or a wall that makes the TV screen sloping over 25off
plumb line. Otherwise, it may cause tumble or injury.
3. One must follow the instructions in this guide to correctly install the TV.
4. It requires more than one person to install the TV.
5. Before installation, examine whether the wall conforms to the specifications and whether the
supplied parts can be fixed on it. The wall for mounting should sustain the weight of TV and
speakers, e.g. cement wall or brick wall. DO NOT attempt to install an area with standard building
rigidity, which sustains the weight of the TV and speakers. If the rigidity of the wall can not be
measured, every mounting hole should sustain a frontal force over 75N,and a shearing force of
over 150N.
6. Use the specified electric drill and drill bit for drilling. The drilling holes should conform to the
specifications.
7. To avoid fire and shock, do NOT place radiator, heater or humidifier below the installed TV.
8. The TV should be kept away from moisture, sensors and power line. The tv should be kept away
from impact and vibration.
9. Ensure that the power supply be disconnected before installation for fear of fire and shock.
Wall-mounting Installation Steps:
1. Take out the bracket form the package and check if there are serious defects (e.g. infirm juncture).
2. Adjust the bracket to the desired angle. Use bolt 7 to adjust the angle by meeting holes of column
beam2 and holes of lever 4.
3. Drill locating holes in the specified dimension in a vertical wall of concrete or brick. The hole size
should be 11mm. The hole depth should accommodate the expanding tube of the bolt.
4. Fix the bolts into the drilled holes in step3, and then cover each bolt with a metal washer. Meet the
four mounting holes in the bracket with the four bolts in the wall, cover each bolt with a metal
washer, then fasten with a screw nut. Check its rigidity by pulling the bracket.
5. Fix the fixture disk to the back cover of the TV using six M4x20 bolts.
6. Wall-mount the TV by putting the six-fixture disk into the six mounting holes A.

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Model No.: LCT-32HSSTP
Version: 1.0
Wall-mounting quick guide

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Model No.: LCT-32HSSTP
Version: 1.0

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Model No.: LCT-32HSSTP
Version: 1.0
CIRCUIT DIAGRAM

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Model No.: LCT-32HSSTP
Version: 1.0

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Model No.: LCT-32HSSTP
Version: 1.0

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Model No.: LCT-32HSSTP
Version: 1.0