Xoceco LC-19HU5610UAE Schematic

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LCD TELEVISION
LC-19HU56S
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CONTENTS
Safety precautions………………………………………………………………………..… Alignment instructions …………………………….…….………………………………… Method of software upgrading…………………………………………………………….. Working principle analysis of the unit……………………………….………….…………. Block diagram…………………………………..………………………………….………… IC block diagram………………………………………………………………………..…… Wiring diagram ……………………………………………………………………………. Troubleshooting guide ………………………………………………………………..…… Schematic diagram………………………………………………………………………… APPENDIX-A: Assembly list APPENDIX-B: Exploded View
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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 must be taken (throughout the entire manufacturing 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 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 statics. 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 would be unable to work and no way to get it repaired. If the connection wires, connections 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
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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.
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Alignment instructions
1. Test equipment
PM5518 (video signal generator) VG-848 (VGA, HDMI signal generator) VG-849 (digital video signal generator) CA210 (color analyzer)
2. Power test
Connect main board, power board and IR board according to the wiring diagram, connect the power and press “standby” to turn on the TV. Measure the pin voltage of XB1, the data is shown in table1:
Table1 voltage data of XB1
XB1 Pin1 Pin2/4/7/8/13 Pin3 Pin5/6 Pin12 LC-19HUXX LC-22HUXX
4.75 V5.25 V
4.75 V5.25 V
3. Alignment flow-chart
The alignment flow-chart is shown as fig-1
Check DDC, FLASH, HDCP and power control IC
Combined test for general assembly
IF channel AFT voltage of TV and AGC voltage adjustment
4. Alignment instruction
4.1 Unit adjustments Connect all the boards according to wiring diagram, then power on 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. Method for software upgrading: When software upgrading please enter factory menu first, select ISP from OPTION, set ISP to 1 and you can begin to upgrade. Af ter upgrade finished, it needs to set
GND
GND
4.75 V5.25 V 11.4 V12.6 V 28.8 V35.2 V
4.75 V5.25 V 11.4 V12.6 V 28.8 V35.2 V
Factory initialization setup
White balance adjustment
Performance check
Preset ex-factory
Fig-1 Alignment flow-chart
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ISP back to 0. If the picture can’t display when upgrading, it needs to solder JB1 on main board. Please unsolder JB1 again after upgrading.
4.2 Initialization Enter factory menu, select “OPTION”, “EEPROM” and “HOTEL OPTION” sub-menu, for adjusting items see table 4.
Table 4 sub-menu adjustment
Items Preset Remarks
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 046 Software will preset the data according to different status. SIF PRESCALE 02E Software will preset the data according to different status. BACK LIGHT FF Software will preset the data according the type of panel ALL COLOR 1 1: white balan ce of each channel auto offset based on the HDMI white
balance
0: white balance of each channel adjust the offset base separately
Note: don’t set ALL COLOR to 1after the offset adjustment, if you do so, the
adjusted parameter of each channel will recover to the parameter of HDMI. EEPROM-MEMORAY RECALL
> EEPROM Initialization (operate when EEPROM data chaos)
4.3 Adjustment for AFT voltage and AGC voltage of IF channel in TV
4.3.1 IF AFC adjustment Disconnect J1(B face), input 38.9MHz PAL signal of 80dB to the pole of J1 near L1 1, Adjust L5
to value 1.25V of TP2. Enter factory menu, adjust TDA4470 from BG to LL, input 33.9MHz SECAM signal of 80dB, adjust R71 to value 1.25V of TP2 then solder J1.
4.3.2 IF AGC adjustment
Input 184.25MHz(PAL/BG) RF signal of 60dBuv to RF terminal, adjust R64 to value 3.75 V±
0.25 V of TP4 and there should be no obvious snowy picture. Increase the signal to 90dBuv and it
should be display normally and no obvious noise.
4.4 White balance adjustment
4.4.1 white balance adjustment of HDMI
a. Input VG-849 signal from HDMI: TIMING854 (800* 600/60Hz) and eighth-level gray scale
signal of PAT920. Use color analyzer CA210 to adjust white balance.
b. Enter submenu of COLOR TEMP, Select 9300k of color temperature
c. Fix value of B OFF, adjust R OFF and G OFF, let the color coordinate of the second level be (285, 293) and the brightness be about 3nit-6nit. Fix value of B GAIN, adjust R GAIN and G GAIN, let the color coordinate of the seventh level be (285, 293). Adjust R OFF, G OFF, R GAIN and G GAIN repeatedly until the value of the two levels gray-scale are (285, 293).
4.4.2 VGA/YPBPR/AV white balance check and correct
a. Connect VG-848 signal of VGA to VGA terminal: TIMING854 ( 800 x 600 / 60Hz) (PATTERN:CROSS) and auto adjust to full screen, then input PAT948 black/white signal, enter factory menu ADC ADJ, select AUTOTUNE and wait for OK display. Input PAT920(8 gray levels), check if the white balance is normal, if not, enter COLOR TEMP menu and set ALL COLOR to 0 and fine adjust according to the method of 4.4.1c)
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b. Connect VG-848 signal of YPBPR to YPBPR terminal and input TIMING972(1080i/60HZ) 100% color bar of PAT976(include black/white bars), Enter ADC ADJ submenu, 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 to the method of 4.4.1c)
c. Connect AV signal (PM5518, 8 gray levels, NTSC) to VIDEO1 terminal, check if the white balance is normal, if not, set ALL COLOR to 0 and fine adjust according to the method of 4.4.1c)
Note: it can’t set back to 1 once ALL COLOR changes to 0.
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.
5.2 A V, YPbPr terminals Input AV/S, YPbPr/YCbCr HD signal, check if the picture 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 Check sound channel Check the speaker of each channel.
5.5 Other function check Check the ON/OFF timer, sleep timer, picture/sound mode, OSD, freeze/mute, stereo, etc.
5.6 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 WSS OFF
6. Software instruction
No.
Code No.
Software instruction
Function
Type
Flash written before paste
Method
NS14 5270008001 ATMEGA8L Power management IC Yes
NS3 5272540003 EN25F40 NA3(NB3) 5272402002 24C02N-10SI27 HDMI EDID Yes
NB3(NB7)
NS5 5272404002 24C04N-10SI27 HDMI HDCP Yes
NS1 5272432001 AT24LC32A/SN
5272421001
(5272402002)
24LCS21A/SN
(24C02N-10SI27)
Main CPU program
VGA EDID Yes
Store some important information
Yes
No
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Written with instrument like ALL11
Unnecessary to
write
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6.2 Main CPU software burn-in need write-protection, below is the setting:
6.2.1 If use ALL - 100:
a) Enter into AUTO interface, select Config. Make sure Config must be selected when burn-in Flash. b) Click Config Setting, set Protect item to All Protect, set SRWD item to Enable, then click OK, write-protection setting is finished. Every time when exit from ALL-100 burn-in program, if want to enter again, the above two steps’ setting must be done again.
If SRWD item is not available, please upgrade ALL-100 burn-in program.
6.2.2 If use Mstar on-line burn-in tool
6.2.2.1 Open the tool, click Device.
a) Select WP Pin pull to high during ISP b) Select New Setting Below.
c) Select Status Register Bit2 Bit3 Bit4 Bit7. Now write-protection setting is
finished.
6.2.2.2 When do on-line upgrade, firstly make sure to confirm write-protection is set correctly.
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Method of software upgrading
1. The tools and software demanded
1) Please confirm that PC has the software of ISP_TOOL and install the parallel interface drive program Port95nt.
2) ISP_TOOL icon is bellow:
3) One parallel cable (25 pins) and one VGA cable (15 pins), t he p arallel cable connect s the PC and the upgrade instrument, the VGA cable connects the TV and the upgrade instrument.
2. The steps for upgrading software
1) Please confirm that the connection wires and the upgrade instrument are connected well before the software written and then power on the TV.
2) Double click the icon ISP_TOOL to open it:
3) Press “Connect“ to connect TV, if the connection is done successfully as shown below, then press “enter”.
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Note: if it appears error, check the connection wires and check if ISP item of the factory menu is set to 1, if not, please set it to 1.
4) After connection is done, it needs to read the Binary document. Press “Read” as shown below:
5) Search the document needed to write in the “Read” check box.
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Select
6) Select the document then the window will appear as shown below:
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7) Press “Auto” to select the writing function.
Select the items shown in the picture above: (a) Read File
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(b) Program (c) Exit ISP (d) Erase Device (e) File Area
8) Press “Run” to begin the writing program, wait till the blue bar is complete.
After writing, it will display OK:
If there is error appeared (shown as below), press “Run” again to rewrite the program till it is success.
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Note1: keep the connection well and don’t cut off the power during the writing process. Note2: the writing speed can be adjusted as shown below. Select “Config” then adjust Speed BAR, the value is bigger the speed is faster . But it is e asier to appear error when increase the speed, so it need to select a suitable speed according the PC.
Step 1
Step 2
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Working principle analysis of the unit
The RF signal received by antenna will be sent to tuner TUN1, then IF signal will be obtained through high amplifier and mixed frequency, through pre-intermediate amplified by V15, then it will be sent to SAW filter Z17 to do IF filter and get better IF characteristics, then it will be sent to N3 (TDA4470) to do intermediate amplification, phase-locked loop VCO and synchronous wave detection to get video signal TV-V; after pre-intermediate amplification IF will also be sent to SAW filter Z16 to do filter at the same time, then it will be sent to TDA4470 to do intermediate amplification and output the second sound intermediate frequency signal (TV-SIF).
The TV-V signal output from TDA4470 together with TV-SIF will be sent to main chip NS2(MST9E19B).
Video signals of AV, VGA and HDMI will be sent to MST9E19B, too.
Video signal of YPbPr and Video RGB of SCART1 via video switch N5 ( PI5V330) will be sent to MST9E19B.
Video signal V (CVBS) of SCART1, YPbPr L/R and SCART1 L/R will be sent to MST9E19B.
The main chip NS2(MST9E19B) is a high performance and fully integrated IC, which can realize video demodulating, video switch selection, A/D and D/A conversion, interlace/progressive 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 MST9E19B processing, sends out 4 pairs of dif ferential signal and 1 p air of clock signal for LCD panel display. TV-V output fromTDA4470 via double video amplifying, it will be sent to SCART1 for AV-OUT.
Audio signal via MST9E19B processing will be sent to sound amplifier NV12 (TDA7266SA) amplifying to speaker. TV-SIF via MST9E19B demodulating and sound processing then output to NV11(LM358D) amplifying, the signal will be sent to SCART1 as AV-OUT.
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Block diagram (LC-19HU56S)
HDMI VGA AV YPbPr
SCART1-RGB
SCART1-V SCART1-L/R L/R-AV L/R-VGA L/R-YPbPr L/R TUNER
EDID 24C02
PRE AMP
TV-SIF
TV-V
SCART1-V OUT TV-L/R SCART1-L/R OUT
IF AMP TDA4470
HDTV SW. PI5V330
SAW
KEY 24C02
EDID 24C02
2*AMP
LCD TV CONTROLLER
MST9E19B
FLASH
EEPROM
PANEL
AUDIO AMP . TDA7266SA
SPEAKER
PRE AMP LM358D
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IC block diagram
1. MST9E19A
The MST9E19A is a h igh performance and fully integrated IC for multi-function LDC monitor/TV with resolutions up to SXGA (1280X1024)/WXGA+(1440X900). It is configured with an integrated triple-ADC/PLL, an integrated DVI/HDCP/HDMI receiver, a multi-standard TV video and audio decoder, a video de-interlacer, a scaling engine, the MStarACE-3 color engine, an on-screen display controller , an 8-bit MCU, and a built-in output panel int erface. To further reduce system costs, the MST9E19A also integrates intelligent power management control capability for green-mode requirements and spread-spectrum support for EMI management.
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2. TDA7266SA
The TDA7266SA is a dual bridge amplifier.
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3. TDA4470
The TDA4470 is an integrated bipolar circuit for multi-standard video/sound IF(VIF/SIF) signal processing in TV/VCR and multimedia applications. The circuit processed all TV video IF signals with negative modulation (e.g., B/G standard), positive modulation (e.g., L standard) and the AM, FM/NICAM sound IF signals.
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Wiring Diagram
Board
Back light
Power Board
Speaker
IR Board, Key Board
30-pin
13-pin
Main Board
7-pin
4-pin
Pin
Insert
Tuner Board
Pin
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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 bright spots
There appear streaks or light color on the screen
1.2 TV set:
Symptoms Possible cause Unable to switch the power on Check to see if the power plug has been inserted properly
No picture and sound Check to see if the power supply of liquid crystal TV has
Deterioration of color phase or color 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
Possibly due to interference from automobile, train, high
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.
Check if interfered by other equipment and if interfered
possibly by the equipment like transmitting antenna,
non-professional radio station and cellular phone.
into the socket.
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.
Check if all the picture setups have been corrected.
crystal TV set and make proper adjustment according to the
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signal types. Picture too bright and there is distortion in the brightest area
Check if the contrast setting is too high. 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 darkest area of the picture
Check if the setting for the brightness is too high Possibly the brightness grade of DVD player (broadcaster)
is set too high. No picture or signal produced from the displayer if “XXX in search” appears. There appears an indication ­“outside the receivable scope)
Check if the cable is disconnected. Check if it’s connected to the proper terminal or if the input
mode is correct.
Check if the TV set can receive input signal. The signal is
not correctly identified and VGA format is beyond the
specified scope. Remote control cannot work properly
Check if the batteries are installed in the reverse order. 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
hash.
Check if the antenna cable is correctly connected, or if it
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 tape, there are lines at the top or bottom of the picture.
When being played or in pause VHS picture search tape
sometimes can’t provide stable picture, which may lead to
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
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2. Troubleshooting guide
k
f
p
d
2.1. No raster
Turn-on power supply, chec if the red indicator is light in the STANDBY?
no
Check if PIN 3(5V) of XS11 on main board is normal?
no
Check STANDBY circuit o
ower supply board
Check NS2 and its
peripheral circuit
no
yes
Press POWER button on the unit or remote control an check the indicator.
blue
Check if the PIN 9, 10 of XS11 on main board is high-level?
yes
Check back light board
no
Check N801 and its
peripheral circuit
red
Check if the PIN 11 of XS11 on main board is low-level?
yes
Check power supply board
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2.2. Raster appears, but no picture
f p
d
P
t
f
d
p
u
d
P
Check if the unit button and remote control are active?
yes
Check if the OSD men can be displaye normally after pressing MENU.
no
no
Replace main board
no
Enter factory-menu, initialize EEPROM, then turn off the TV, turn on again, check i
icture appears?
Adjust main boar
again
yes
Check TUN1 an its periphery
yes
yes
yes
Check if TP1 on the
Check if TP1 on the TV board has 1VP
TV board has 1VP signal or noise?
signal or noise?
no
Check if all channels have no signal?
Which channel has
no signal ?
TV
Check if outpu IF signal o TUN1 (pin 11) is normal?
Check N3 and its
eriphery
no
VGA/YPBPR/SCART/HDMI
Replace main board
no
yes
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2.3. No sound (Use TV input as an example)
f
N
p
d
p
p
Check if PIN 3, 13 voltage of NV12 is normal?
yes
Check the waveform
of PIN 4, 12 o
V12
no
Check power supply
Check N3 PIN 24
waveform.
Check TUN1 PIN 11
waveform.
Check TUN1 and its
eriphery
no
no
no
yes
yes
yes
Check NV12 an its periphery
Check NS2 and its
eriphery
Check N3 and its
eriphery
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Main Board Schematic diagrams
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Page 1, total 8 pages
Page 28
Main Board Schematic diagrams
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Page 2, total 8 pages
Page 29
Main Board Schematic diagrams
27
Page 3, total 8 pages
Page 30
Main Board Schematic diagrams
28
Page 4, total 8 pages
Page 31
Tuner Board Schematic diagrams
29
Page 5, total 8 pages
Page 32
30
IR & Key Board Schematic diagrams
Page 6, total 8 pages
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31
Power Board Schematic diagrams
Page 7, total 8 pages
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32
Back light Board Schematic diagrams
Page 8, total 8 pages
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Appendix-A: Board list (9219HU5610)
Name No. Main components & its number
Tuner Board 6HU0885510 N3 TDA4470 (5274470001)
Main Board 6HU0880110 NS2 MST9E19B 5270919002
NV12 TDA7266SA (5277266001)
Key Board 6HU08805A0
IR Board 6HC0060910
Back Light Board 6LV0261410
Power Board 6HU0822010
Remote Control 6010N03401 RC-N34-0A
Display Panel 5203195201 CLAA185WA02
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APPENDIX-B: Exploded view (LC-19X56)
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PART LIST OF EXPLODED VIEW
NO. DESCRIPTION
1 panel 2 front cabinet 3 speaker 4 light conducting column 5 IR decorative piece 6 IR light conducting piece 7 IR board 8 main board
9 interface baffle 10 wall mounting bracket 11 screw 12 back cabinet 13 stand 14 screw 15 power switch bracket 16 conductive interleaver 17 key board 18 backlight board 19 power board 20 main board frame 21 EVA adhesive tape
Note: design and specifications are subject to change without notice.
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9219HU5610 Ver.1.0
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