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LCD TELEVISION
LC-32HK36S
CONTENTS
Safety precautions...................................................................................... 1
Alignment instructions ................................................................................ 3
Working principle analysis of the unit...............................................................6
Block diagram.............................................................................................7
IC block diagram.........................................................................................8
Wiring diagram ........................................................................................ 12
Troubleshooting guide ................................................................................ 13
Schematic diagram.................................................................................... 18
APPENDIX-A: Assembly list
APPENDIX-B: Exploded View
Attention: This service manual is only for service personnel to take reference with. Before
servicing please read the following points carefully.
Safety precautions
1. Instructions
Be sure to switch off the power supply before replacing or welding any components or
inserting/plugging in connection wire Anti static measures to be taken (throughout the entire
production process!):
a) Do not touch here and there by hand at will;
b) Be sure to use anti static electric iron;
c) It's a must for the welder to wear anti static gloves.
Please refer to the detailed list before replacing components that have special safety requirements.
Do not change the specs and type at will.
2. Points for attention in servicing of LCD
2.1 Screens are different from one model to another and therefore not interchangeable. Be sure to
use the screen of the original model for replacement.
2.2 The operation voltage of LCD screen is 700-825V. Be sure to take proper measures in
protecting yourself and the machine when testing the system in the course of normal operation or
right after the power is switched off. Please do not touch the circuit or the metal part of the module
that is in operation mode. Relevant operation is possible only one minute after the power is
switched off.
2.3 Do not use any adapter that is not identical with the TV set. Otherwise it will cause fire or
damage to the set.
2.4 Never operate the set or do any installation work in bad environment such as wet bathroom,
laundry, kitchen, or nearby fire source, heating equipment and devices or exposure to sunlight etc.
Otherwise bad effect will result.
2.5 If any foreign substance such as water, liquid, metal slices or other matters happens to fall into
the module, be sure to cut the power off immediately and do not move anything on the module lest it
should cause fire or electric shock due to contact with the high voltage or short circuit.
2.6 Should there be smoke, abnormal smell or sound from the module, please shut the power off at
once. Likewise, if the screen is not working after the power is on or in the course of operation, the
power must be cut off immediately and no more operation is allowed under the same condition.
2.7 Do not pull out or plug in the connection wire when the module is in operation or just after the
power is off because in this case relatively high voltage still remains in the capacitor of the driving
circuit. Please wait at least one minute before the pulling out or plugging in the connection wire.
2.8 When operating or installing LCD please don't subject the LCD components to bending, twisting
or extrusion, collision lest mishap should result.
2.9 As most of the circuitry in LCD TV set is composed of CMOS integrated circuits, it's necessary
to pay attention to anti static. Before servicing LCD TV make sure to take anti static measure and
ensure full grounding for all the parts that have to be grounded.
2.10 There are lots of connection wires between parts behind the LCD screen. When servicing or
moving the set please take care not to touch or scratch them. Once they are damaged the screen
1
would be unable to work and no way to get it repaired.
If the connection wires, connectors or components fixed by the thermotropic glue need to disengage
when service, please soak the thermotropic glue into the alcohol and then pull them out in case of
damage.
2.11 Special care must be taken in transporting or handling it. Exquisite shock vibration may lead to
breakage of screen glass or damage to driving circuit. Therefore it must be packed in a strong case
before the transportation or handling.
2.12 For the storage make sure to put it in a place where the environment can be controlled so as to
prevent the temperature and humidity from exceeding the limits as specified in the manual. For
prolonged storage, it is necessary to house it in an anti-moisture bag and put them altogether in one
place. The ambient conditions are tabulated as follows:
Temperature Scope for operation 0 ~ +50 oC
Scope for storage -20 ~ +60 oC
Humidity Scope for operation 20% ~ 85%
Scope for storage 10% ~ 90%
2.13 Display of a fixed picture for a long time may result in appearance of picture residue on the
screen, as commonly called "ghost shadow". The extent of the residual picture varies with the
maker of LCD screen. This phenomenon doesn't represent failure. This "ghost shadow" may remain
in the picture for a period of time (several minutes). But when operating it please avoid displaying
still picture in high brightness for a long time.
3. Points for attention during installation
3.1 The front panel of LCD screen is of glass. When installing it please make sure to put it in place.
3.2 For service or installation it's necessary to use specified screw lest it should damage the screen.
3.3 Be sure to take anti dust measures. Any foreign substance that happens to fall down between
the screen and the glass will affect the receiving and viewing effect
3.4 When dismantling or mounting the protective partition plate that is used for anti vibration and
insulation please take care to keep it in intactness so as to avoid hidden trouble.
3.5 Be sure to protect the cabinet from damage or scratch during service, dismantling or mounting.
2
Alignment instructions
1. Test equipment
PM5518 (video signal generator)
VG-848 (VGA and HDMI signal generator)
CA210 (color analyzer)
2 Alignment flow-chart
The alignment flow-chart is shown as fig-1
Check DDC, HDCP KEY, FLASH
Combined test for general assembly
Factory initialization setup
IF channel AFT voltage of TV and AGC voltage adjustment
White balance adjustment
Performance check
Preset ex-factory
Fig-1 adjustment flow-chart
3 Unit adjustments
Connect all the boards according to wiring diagram, connect with power and observe the display.
Method for entering factory menu: press "INPUT", "2", "5", "8" and "0" in turn to enter factory
menu; press "CH+" and "CH-" to select adjustment items and press "VOL+" and "VOL-" to adjust
value items, press "MENU" repeatedly to exit.
3.1 Initialization
Enter factory menu, select "OPTION" and "HOTEL OPTION" sub-menu, adjustment of items to see
table1.
Table1 sub-menu adjustment
Items Preset Introduce
HOTEL 0 1: HOTEL OPTION of factory menu is optional
0: HOTEL OPTION of factory menu is not optional
LOGO 1 1: display LOGO in no signal or turn on
0: no LOGO display
ADC PRESCALE 00A adjust according the power consumption
3
SIF PRESCALE 000 adjust according the power consumption
BACK LIGHT 28 Adjust according the screen
ALL COLOR 1 1: white balance of each channel auto offset based on the HDMI white
balance
0: white balance of each channel adjust the offset base separately
ISP 0 0: no upgrade on line
1: upgrade on line
NO STANDY 00 01: turn on 00: memory function of turn on 10: standby
INIT VOLUME 0-100 Volume when turn on
INIT CHANNEL 1-200 Channel when turn on
INIT SRC Program source Input Source when turn on
EEPROM-MEMORAY > EEPROM Initialization (operate when EEPROM data chaos)
RECALL
3.2 Adjustment for AFT and AGC of IF channel in TV
3.2.1 IF AFT adjustment
Disconnect J601(B face), input 80dB 38.9MHz PAL signal to the pole of J601 near the socket,
adjust L604 to value 1.65V of TP602, enter the factory menu, set TDA4470 from BG to LL and input
80dB 33.9MHz SECAM signal, adjust RP602 to value 1.65V of TP602, then weld J601.
3.2.2 IF AGC adjustment
Input 184.25MHz RF signal of 60dB to RF terminal, adjust RP601 to value 4V of TP604, and there
should be no obvious snowy picture. Increase the input signal to 90dBV and it should be no obvious
noisy.
3.3 White balance adjustment
3.3.1 HDMI white balance adjustment
a. Input VG-848 signal to HDMI: TIMING854(800*600/60Hz)of PAT920 8 gray scale signal,
adjust the balance with CA210.
b. Enter COLOR TEMP sub menu and select color temperature of standard (9300K), the
value of coordinate is recommended.
c. Fixed B GAIN, adjust R GAIN, G GAIN to let the color coordinate of the seventh level be
(285,293); Fixed BOFF, adjust R OFF, G OFF to let the color coordinate of the second level be
(285,293) and the brightness is about 3nit-10nit. Repeat adjust R GAIN, G GAIN, R OFF and G OFF,
until the color coordinate of the two level gray scale be (285,293).
3.3.2 VGA/YPbPr/ AV white balance check and correct
a. Connect VG-848 signal of VGA to VGA terminal and input TIMING854 (800*600/60HZ)
(PATTERN: CROSS), and auto adjust to full screen then input PAT948 white and black signal, enter
submenu of ADC ADJ, select AUTOTUNE and wait for OK display. Input PAT920(8 gray levels),
check if the white balance is normal, if not, set ALL COLOR to 0 and fine adjust according the
method of 3.3.1
b. connect VG-848 YPbPr signal to YPbPr terminal and input TIMING972(1080I/60Hz) PAT908
color bar(include back/white bars), enter submenu of ADC ADJ, select AUTOTUNE and wait for OK
display. Input PAT920(8 gray levels), check if the white balance is normal, if not, set ALL COLOR to
0 and fine adjust according the method of 3.3.2
c. Input AV signal(PM5518,8 gray scale) to VIDEO terminal and check if the white balance is
4
normal, if not, set ALL COLOR to 0 and fine adjust according the method of 3.3.2.
Note: it can't set back to 1 once ALL COLOR changes to 0.
4. Software upgrading:
Enter factory menu and select "OPTION", set ISP to 1 and you can upgrade the software on line.
After upgrade, it needs to set ISP back to 0. if it can not display the image during the upgrading, join
J1 on 01S board, then perform the upgrading, when upgrade finish, disconnect J1 again.
5 Performance check
5.1 TV function
Enter searching menu auto search, connect RF-TV terminal with central signal source and check
if the picture is normal, if there are channels be skipped. Check TXT and parental control function.
5.2 AV/S, YPbPr terminals
Input AV/S, YPbPr / YCbCr HD signals, check if it is normal.
5.3 VGA terminal
Insert VGA terminal, input VGA format signal of 640X480@60 Hz and check if the display is normal.
5.4 HDMI terminal
Insert HDMI terminal, input 640X480@60Hz signal, check if the display is normal. Check HDCP
function.
5.5 check sound channel
Check the speaker and earphone of each channel.
5.6 RS232 terminal
Insert the earphone wire to COM port, check the long-distance control function with special test
software.
5.7 other function check
Check the turn on/turn off timer, asleep timer, picture/sound mode, OSD, freeze/mute, stereo, etc.
5.8 presetting before ex-factory
Item Setting Item Setting Item Setting
PICTURE MODE STANDARD BALANCE 50 OSD LANGUAGE English
COLOR MODE NORMAL VOLUME 50 OSD HPOSITION 50
NR WEAK SLEEP TIMER OFF OSD VPOSITION 50
ZOOM FULL TTX LANGUAGE WEST OSD HALFTONE 50
SOUND MODE STANDARD BLUE SCREEN OFF OSD DURATION 15
AVC OFF AFC ON
5
Working principle analysis of the unit
The RF signal received by antenna will be sent to tuner TUN601, then IF signal will be obtained
through high amplified and mixed frequency. After pre-intermediate amplified by V608, it will be sent
to acoustic surface-wave Z605 to do IF filter and get better IF characteristics, then it will be sent to
N602 (TDA4470) to do intermediate amplification, phase-lock loop VCO and synchronous wave
detection to get the video signal TV-V; after pre-intermediate amplification IF will also be sent to
acoustic surface-wave Z604 to do filter at the same time, the it will be sent to N404 to do
intermediate amplification and output the second sound intermediate frequency signal TV-SIF.
TV-V output from TDA4470 and TV-SIF will be sent to the main IC N304(MST9E89DL)
Video and audio signals of AV/S, VGA, YPbPr will be sent to MST9E89DL too.
3 groups HDMI after PS321 selecting, their video and audio signal will be sent to MST9E89DL.
RGB of SCART1, AV, S-Y and S-C of SCART2 will also be sent to MST9E89DL, their audio
signal and YPbPr, AV/S audio signal via audio switch HEF4052BT selection to MST9E89DL.
The main IC N304(MST9E89DL) is a high performance and fully integrated IC, which can
realize HDMI interface processing, video decoding, video switch selection, A/D and D/A conversion,
interlace/de-interlace processing, modes conversion, OSD and low-voltage differential output, etc.
And it also has functions of audio selection, processing and MCU.
The video signal via MST9E89DL processing, output 4 pairs differential signal and 1 pair clock
signal for LCD panel display. TV-V from TDA4470 after video double amplifying and sent to
SCART1 as AV-OUT. AV processed by MST9E89DL after quadruple amplifying and output as
AV-OUT and SCART2 AV-OUT.
The audio signal via MST9E89DL processing, it will be sent to N206 (BH3547F) amplifying to
earphone. The audio signal will also sent to sound amplifier N203 (TPA3120-D2) amplifying to
speaker. TV-L/R processed by MST9E89DL will be sent to SCART1 for AV-OUT, at the same time,
TV-L/R and AV-L/R will output together as the audio output of AV-OUT and SCART2 AV-OUT.
6
Block diagram
EDID
EDID
24C02
24C02
HDMI 1/2/3 PS321 DDR
VGA
L/R-VGA FLASH
YPbPr
(DTV)
LCD TV EEPROM
SCART1-RGB CONTROLLER
SCART1-AV HDCP KEY
SCART1-L/R MST9E89DL
AUDIO SW.
SCART2-L/R HEF4052
L/R-YPbPr PANEL
L/R-AV/S
SCART2-Y
SCART2-C
AV AUDIO AMP.
S-VIDEO BH3547F
TUNER SAW
EAR PHONE
IF AMP TV-V
TV-SIF AUDIO AMP.
TDA4470 SPEAKER
TPA3120D2
AV-L/R
SCART1-V OUT 2*AMP TV-L/R
SCART2-L/R OUT
AV-L/R OUT
AV OUT 4*AMP CVBS
SCART2-V OUT SCART1-L/R OUT
TV-L/R
7
IC block diagram
1. MST9E89DL
The MST9E89DL is a high performance and fully integrated IC for multi-function LCD monitor/TV
with resolutions up to full HD (1920x1080). It is configured with an integrated triple-ADC/PLL, an
integrated DVI/HDCP/HDMI receiver, a multi-standard TV video and audio decoder, two video
de-interlacers, two scaling engines, the MStarACE-3 color engine, an on-screen display controller,
an 8-bit MCU and a built-in output panel interface. By use of external frame buffer, PIP/POP is
provided for multimedia applications Furthermore, 3-Dvideo decoding and processing are fulfilled
for high-quality TV applications. To further reduce system costs, the MST9E89DL also integrates
intelligent power management control capability for green-mode requirements and spread-spectrum
support for EMI management.
8
2. TDA4470
9
3. TPA3120D2
The TPA3120D2 is a 20-W (per channel) efficient, Class-D audio power amplifier for driving stereo
single ended speakers or mono bridge tied load. The TPA3120D2 can drive stereo speakers as low
as 4. The efficiency of the TPA3120D2 eliminates the need for an external heat sink when playing
music.
The gain of the amplifier is controlled by two gain select pins. The gain selections are 20, 26, 32, 36
dB.
The outputs are fully protected against shorts from GND to ROUT or LOUT and output-to-output
shorts with an auto recovery feature.
10
11
Wiring diagram
power board power board
speaker
key board
IR board
panel
main power output key, IR tuner power amplifier power
audio output
signal
main board
connection board
signal
12
Trouble shooting
1. Fault clearance
Before servicing please check to find the possible causes of the troubles according to the table
below.
1.1 Antenna (signal):
Picture is out of focus or jumping Bad status in signal receiving
Poor signal
Check if there are failures with the electrical connector or
the antenna.
Check if the antenna is properly connected.
Fringe in picture Check if the antenna is correctly oriented.
Maybe there is electric wave reflected from hilltop or
building.
Picture is interfered by stripe shaped Possibly due to interference from automobile, train, high
bright spots voltage transmission line, neon lamp etc.
Maybe there is interference between antenna and power
supply line. Please try to separate them in a longer
distance.
Maybe the shielded-layer of signal wire is not connected
properly to the connector.
There appear streaks or light color Check if interfered by other equipment and if interfered
on the screen possibly by the equipment like transmitting antenna,
non-professional radio station and cellular phone.
1.2 TV set:
Symptoms Possible cause
Unable to switch the power on Check to see if the power plug has been inserted properly
into the socket.
No picture and sound Check to see if the power supply of liquid crystal TV has
been switched on. (As can be indicated by the red LED at
the front of the TV set)
See if it's receiving the signal that is transmitted from other
source than the station
Check if it's connected to the wrong terminal or if the input
mode is correct.
Check if the signal cable connection between video
frequency source and the liquid crystal TV set is correct.
Deterioration of color phase or color Check if all the picture setups have been corrected.
tone
Screen position or size is not proper Check is the screen position and size is correctly set up.
Picture is twisted and deformed Check to see if the picture-frame ratio is properly set up.
Picture color changed or colorless Check the "Component" or "RGB" settings of the liquid
crystal TV set and make proper adjustment according to the
13
signal types.
Picture too bright and there is Check if the contrast setting is too high.
distortion in the brightest area Possibly the output quality of DVD broadcaster is set too
high.
It maybe also due to improper terminal connection of the
video frequency signal in a certain position of the system.
Picture is whitish or too bright in the Check if the setting for the brightness is too high
darkest area of the picture Possibly the brightness grade of DVD player (broadcaster)
is set too high.
No picture or signal produced from Check if the cable is disconnected.
the displayer if "XXX in search" Check if it's connected to the proper terminal or if the input
appears. mode is correct.
There appears an indication - Check if the TV set can receive input signal. The signal is
"outside the receivable scope) not correctly identified and VGA format is beyond the
specified scope.
Remote control cannot work Check if the batteries are installed in the reverse order.
properly Check if the battery is effective.
Check the distance or angle from the monitor.
Check if there is any obstruct between the remote control
and the TV set.
Check if the remote control signal- receiving window is
exposed to strong fluorescence.
No picture and sound, but only Check if the antenna cable is correctly connected, or if it
hash. has received the video signal correctly.
Blur picture Check if the antenna cable is correctly connected.
Of if it has received the right video signal.
No sound Check if the "mute" audio frequency setting is selected.
Check if the sound volume is set to minimum.
Make sure the earphone is not connected.
Check if the cable connection is loose.
When playing VHS picture search When being played or in pause VHS picture search tape
tape, there are lines at the top or sometimes can't provide stable picture, which may lead to
bottom of the picture. incorrect display of the liquid crystal TV, In this case please
press "auto" key on the remote control so as to enable the
liquid crystal TV set to recheck the signal and then to
display correct picture signal
14
2. Troubleshooting guide
2.1. No raster
Connect the power, check if yes
the red indicator is light in
STANDBY?
no
Check if X403 PIN9 (5V) of Press POWER button on the red
main board is normal? unit or remote sensor control
and check the indicator.
blue
no
Check if the PIN3 of X401 on
Check STANDBY circuit of
main board is high-level?
power supply board
yes
Check the panel, LVDS wires
and back light board.
no
Check if the PIN11 of X403 in
no
Check N304 and its main board is high-level?
periphery
yes
Check N304 and its Check power
periphery supply board
15
2.2. Have raster, but no picture
Check if the unit button Does display OSD yes
yes
and remote control menu in screen when
operation? press menu button?
no no
Check if the all channels
yes
have no signal?
no
HDMI/VGA/YPRPB
Enter factory-menu, Which channel is
initialization EEPROM, no signal?
then turn off the TV,
no turn on again, display
TV Check N304 and
picture?
its peripery
yes
Adjust main board
again
Check if there is 1VPP
Check N304 and yes signal or noisy of X405
its periphery TP601 on main board?
no
no Check if TUNER601
(pin11) IF output is
normal?
Check TUNER601
yes
and its periphery
Check N601 and
its periphery
16
2.3. No sound
yes yes
Check the voltage of Check the wave of Check N203 and
N203 pin1, 3, 10, 12, pin 5, 6 of N203 its periphery
19, 20
no
no
Check the wave of yes Check N304 and
Check power board N602 pin 24 its periphery
no
yes
Check the wave of Check N602 and
TUNER601 pin 11 its periphery
no
Check TUNER601
and its periphery
17
APPENDIX-A: Main assembly 9232HK3610
NAME NO. MAIN COMPONENT AND IT'S NO.
N304 MST9E89DL (5270989005)
Main board 6HK02001A0 N602 TDK4470MFL (5274470001)
N203 TPA3120-D2 (5273120001)
SCART connection board 6HE0014610
Key board 6HU02505A0
IR board 6HU02509A0
Power board 6HU0212010
Remote control 6010Y06002 RC-Y60-0B
Panel 5203325207 CLAA320WF01U
APPENDIX-B: Exploded view (LC-32X36)
PART LIST OF EXPLODED VIEW
NO. PART NO. DESCRIPTION
1 585A423030 decorative board
2 5QG36L2010 front cabinet
3 IR board
4 key board
5 panel
6 58A004160E panel frame
7 58A0071400 panel fixed bracket
8 58A0057700 power board bracket
9 58A0C40700 panel frame
10 58A0A4060B panel frame
11 574G18801C main board frame
12 main board
13 analog board
14 5810A5071A AV baffle
15 5HG36LK010 back cabinet
16 6151085600 stand
17 58A004100A wall mounting bracket
18 581AA59810 AV baffle
19 interface connection board
20 power board
21 58B0033410 connection frame
22 58A004100A stand bracket
23 58A0D4080A panel frame
24 58A0041100 connection piece
25 58A004170C panel frame
26 5500806004 speaker
27 58B0A33210 side AV bracket
28 615CA82420 speaker net
Note: design and specifications are subject to change without notice.
9232HK3610
Ver.1.0