XOCECO LC-42HW36 User manual

LCD TELEVISION
LC-42/47HW36

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
1
3
9
11
12
13
23
24
32

1
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 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
Note: This maintenance manual is intended only for the reference of the maintenance people.
Please pay attention to the following points before carrying out the maintenance work.

2
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
in case of dagmage.
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.

3
Alignment instructions
1. Alignment equipment
PM5515 (video signal generator)
VG-848/VG-849 (YUV, VGA, DVI/HDMI signal generator)
CA210 (white balancer)
2. Alignment flow-chart
The alignment flow-chart is shown as fig-1
Fig-1 adjustment flow-chart
3. Adjusting instruction
3.1 Unit adjustments
Connect all the boards according the wiring diagram, then power on and check if the display is
normal.
The method for using factory menu:
First press the “source” button, then press the “2580“ buttons to enter factory menu. Press the
“SLEEP” button to select the adjustment page menu, press ▲and ▼to select item, press ◄and ►
Check if DDC and FLASH are flash written
To produce digital board and analog board
All testing
White balance adjustment
Connect with central signal source, then check each function of TV such as
station leaking, analog control etc., check the output of headphone and speaker
Input AV/SVIDEO signal, then check each function of all the terminals
Input VGA, HDMI signal, check if the display is normal, check eac
h
function such as analog control etc., check horizontal /vertical center etc.
Preset ex-factory
Check the accessories and pack them in box
Input HD signal then check each function of the terminal

4
to adjust the value, press “MENU” button to exit the factory menu. If the unit does not turn off, you
can press the “SLEEP” button to enter factory menu again. Turn off the unit to exit the factory menu.
3.2 EEPROM initialization
Enter page one of the factory menu, select the EEPROM INITIALIZE to ON, turn off the unit then
turn on again.
Note: it needs a little long time to display the LOGO after turn on again.
3.3 White balance adjustment
The 16 level gray-scale signal (DVI:TIMING978 PATTAN921, HDMI:TIMING853, PATTERN992)
sends to DVI/HDMI channel from VG-848/VG-849, enter S.Magic sub menu of the user menu and
set “PWM” and “Sensor” to off, then enter the factory menu white balance adjustment page. Select
the normal color temperature item, fixed GGAIN to be 128, adjust B, RGIAN to let the third color
coordinate on the right be (280, 290 )at 400nits; fixed the GOFFSET to be 128H, adjust B,
ROFFSET to let the third color coordinate on the left be (280,290) at 5 nits.
Select the cool color temperature, adjust the color coordinate be (270, 283).
Select the warm color temperature, adjust the color coordinate be (300, 310).
After adjustment, switch to AV, VGA and YPbPr and have a check. If there is some deviation in
some channel, please adjust it independently.
Note: after adjust the white balance in HDMI, it will store the adjusted data to other channels.
4 Performance check
4.1 TV function
Connect RF-TV terminal to the central signal source and enter the setting menu, set the country
category, then enter the search menu →auto search, check if there is station skipping. Check the
manual search, fine turning, the output of speaker and earphone and picture. Open the PIP and
POP modes, connect the earphone and check the display and sound.
4.2 AV/S-video input terminal
Input AV/S signal, check if the picture and sound is normal. Open the PIP and POP modes, connect
the earphone and check the display and sound.
4.3 YPbPr /YCbCr terminal
Input the YUV signal (VG-848 signal generator), separate input YUV format signal of table 1, check
if the image and sound is normal. If the image is deflection of the H-field, select auto sync correction
of the SCREEN menu. If the image is slight disturb, adjust the FINE TUNE correction of the
SCREEN menu. Open the PIP mode, connect the earphone, and check if the image and sound is
normal.
Table 1 YUV format signal
No H-frequency (KHz) V-frequency (KHz) Signal
1 15.734 59.94 SDTV 480i
2 31.469 59.94 HDTV 480p
3 44.955 59.94 HDTV 720p
4 33.716 59.94 HDTV 1080i
5 67.5 60 HDTV 1080P
6 15.625 50 SDTV 576i
7 31.25 50 HDTV 576p

5
8 37.5 50 HDTV 720p
9 33.75 50 HDTV 1080i
10 56.25 50 HDTV 1080P
4.4 VGA terminal
Input the VGA signal (VG-848 signal generator), separate input VGA format signal of table 2, check
if the image and sound is normal. If the image is deflection of the H-field, select auto sync correction
of the SCREEN menu. If the image is slight disturb, adjust the FINE TUNE correction of the
SCREEN menu. Open the PIP mode, connect the earphone, and check if the image and sound is
normal.
4.5 HDMI terminal
HDMI signal format receive the three high definition signal: 480P, 576P, 720P/50/60Hz,
1080I/50/60Hz, 1080P/50/60Hz except for the table 2 signal. Check if the image (contain HDCP ON
and OFF) and sound is normal (use VG-849 generator). If the image is deflection of the H-field,
perform manual correction of the SCREEN menu. Open the PIP mode, connect the earphone, and
check if the image and sound is normal. Input DVI audio signal and check if it is normal.
Table2 VGA signal format
No Resolution H-frequency(kHz) V-frenquency(Hz) Point clock pulse
frenquency(MHz) Remark
1 720x400 31.469 70.086 28.322 IBM
2 640x480 31.469 59.94 25.175 IBM
3 640x480 37.861 72.809 31.5 VESA
4 640x480 37.5 75 31.5 VESA
5 640x480 43.269 85.008 36 VESA
6 800x600 35.156 56.25 36 VESA
7 800x600 37.879 60.317 40 VESA
8 800x600 48.077 72.188 50 VESA
9 800x600 46.875 75 49.5 VESA
10 800x600 53.674 85.061 56.25 VESA
11 1024x768 48.363 60.004 65 VESA
12 1024x768 56.476 70.069 75 VESA
13 1024x768 60.023 75.029 78.75 VESA
14 1280x1024 63.98 60.02 108.00 VESA
15 1024x768 68.667 84.98 94.486 VESA
4.6 Ex-factory setting
Table3 Factory Option Menu
Item Setting
IIC Bus-off
Enter Update Mode
EEPROM Initialize Off
Backlight Adjustable Off
Back Light 0

6
ShowLogo On
Hotel Mode Off
Direct Power On Off
Channel switch blank On
Preset Programs Off
Note: Back Light, Hotel Mode, Direct Power On have no function temporarily.
Table4 Factory Audio Setting
Item Setting
Volume 1 85H
Volume 25 B2H
Volume 50 C7H
Volume 75 D8H
Volume 100 ECH
Prescale_TV 42H
Prescale_Others 50H
Prescale_HDMI 78H
AIS_ADC_GAIN 05H
Main pic Hp F6H
HP VOLUME SETTING
Volume 1 50H
Volume 25 ABH
Volume 50 B9H
Volume 75 C7H
Volume 100 D6H
Table5 Factory Video Limit Setting
Item CVBS D-SUB YPbPr HDMI
Brightness Min 80H 60H 70H 70H
Brightness Mid 90H 80H 85H 90H
Brightness Max B0H A0H A0H B0H
Contrast Min 50H 70H 50H 50H
Contrast Mid 70H 90H 70H 70H
Contrast Max 85H B0H 85H 85H
Sharpness Min 40H 40H 40H 40H
Sharpness Mid 60H 60H 60H 60H
Sharpness Max 80H 80H 80H 80H
Color Min 00H 00H 00H 00H
Color Mid 40H 40H 40H 40H
Color Max 80H 80H 80H 80H

7
Hue Min 00H 00H 00H 00H
Hue Mid 40H 40H 40H 40H
Hue Max 80H 80H 80H 80H
Table6 White Balance Adjust
Item CVBS D-SUB YPbPr HDMI
R Offset 119 119 119 119
G Offset 128 128 128 128
B Offset 123 123 123 123
R Gain 129 129 129 129
G Gain 128 128 128 128
B Gain 115 115 115 115
Color Temperature Standard
R Offset 120 120 120 120
G Offset 128 128 128 128
B Offset 121 121 121 121
R Gain 123 123 123 123
G Gain 128 128 128 128
B Gain 126 126 126 126
Color Temperature Cold
R Offset 118 118 118 118
G Offset 128 128 128 128
B Offset 126 126 126 126
R Gain 141 141 141 141
G Gain 128 128 128 128
B Gain 95 95 95 95
Color Temperature Warm
Table7 Picture Setting
CVBS Dynamic Standard Mild Custom
Contrast 90 80 50 50
Brightness 60 50 40 50
Colour 70 60 40 50
Tint 0 0 0 00
Sharpness 60 50 30 50
D-SUB Dynamic Standard Mild Custom
Contrast 90 80 50 50
Brightness 50 40 30 50
Colour 70 60 40 50
Tint 0 0 0 00

8
Sharpness 60 50 30 50
YPbPr Dynamic Standard Mild Custom
Contrast 90 80 50 50
Brightness 50 40 30 50
Colour 70 60 40 50
Tint 0 0 0 00
Sharpness 60 50 30 50
HDMI Dynamic Standard Mild Custom
Contrast 90 80 50 50
Brightness 50 40 30 50
Colour 70 60 40 50
Tint 0 0 0 00
Sharpness 60 50 30 50
Note: You can set the value of the picture and sound mode at the factory menu. In other situation, the
changed value will be store in Custom mode.
Table8 Audio Setting
User Surround Music Movie
Treble 50 50 80 60
Bass 50 50 80 80
4.8 Ex-factory setting of user menu
1) select TV channel
2) video menu, Mode: Standard, colour temperature: nature
3) audio menu, Volume: 20, Balance: 00, Earphone volume:20, Mode: user, BBE: off, AVC: off
4) screen menu, Mode: Auto
5) station menu, Color mode: Auto, Sound mode: DK
6) setting menu, Child Lock: Off, Language: Chinese, OSD transparency :7, OSD time out: 15s,
Blue Screen: On.
Note: the 4) and 5) items should be set according to clients require. The user menu may be different
depending on the clients.

9
Method of software upgrading
1. Software install instrument
a) Double click “PXSDKToolkitV1.0.5” to install the upgrade flat.
b) Execute “ISPWriter3.exe” to enter IAP program.
2. Instrument
Upgrade board (667.42HW36-90), USB wire (one male terminal and one mini terminal), VGA
cable(665.D0002-510 with pin4 and pin11).
3. Upgrade method when the unit is normal
a) Click “ISPWRITER3” icon on the desk to open the upgrade software, click “OPEN” of the
tool bar to begin communication, enter the factory menu and select “Enter Update Mode” of
the first OSD page to enter the upgrade mode.
b) Click “BIN” of the tool bar and select the upgrade software, click “PROG” on the tool bar to
begin upgrade.
3. BIN 5. PROG
4. Select the upgrade software

10
c) The upgrade is over when appear “ISP OVERFLOW”, click “Reboot” of the tool bar to
start-up the unit, then the upgrade is complete.
4. Upgrade method when the unit can’t power on normally.
Click “ISPWRITER3” icon on the desk to open the upgrade software, click “OPEN” on the tool bar
to begin communication, then click “DIAL” on the tool bar to test the state of the unit, power on the
unit now to enter the upgrade automatically, then perform according 3), 4).
6. Reboot
1. OPEN 2. DIAL

11
Working principle analysis of the unit
1. Analog signal
Antenna reception signal RF will be sent to integrative tuner (contain HF and IF amplifier circuit), the
tuner is controlled by the command (SDA and SCL) of the MCU N801(M16C), select appropriate
channel to system switch, via HF amplifier and IF amplifier decode, output video signal CVBS and
second sound signal SIF.
AV1, AV2 audio signal(AV1 and S-Video share the same audio channel), YPbPr1, YPbPr2 audio
signal, D-SUB/DVI audio, USB/PVR audio, HDMI and SIF are sent to N103(SGTV58xy audio
process and volume control) for audio switch, the selected audio signal is separated into left and
right channel and sent to digital audio amplifier N106(TPA3120) to amplify, then sent to speaker.
CVBS, AV1, AV2, S-Video signal (Y signal of S-Video and AV1 video share the same channel), USB
or YUV signal of PVR mode and D-SUB signal via matched resistance, the signal separately
through alone channel send to main IC NS01 (SVP-WX68) video switch, A/D transition, digital
decode, image scale and OSD superposition, then send to LVDS level drive for LCD screen.
Video signal of YPbPr1, YPbPr2 via matched resistance to video switch NB05 (PI5V330), after
switch the select signal will be sent to main IC NS01 (SVP-WX68) video switch, A/D transition,
digital decode, image scale and OSD superposition, then send to LVDS level drive for LCD screen.
2. Digital signal
HDMI1, HDMI2, HDMI3 digital signal via digital video switch NA04(PS301), select one signal to
send to main IC NS01 (SVP-WX68) video and audio separate first, video signal via digital decode,
image scale and OSD superposition to output LVDS level drive for LCD screen; digital audio signal
I2S will be sent to N103 (SGTV58xy audio process and volume control).

12
Block diagram

13
IC block diagram
1. DPTV-SVP-WX68
Video signal from TUNER1, AV, RGB signal, Y and C signal, YUV, YPbPr signal via matched
resistance, the signal separately through alone channel send to main IC NS01(SVP-WX68) video
switch, A/D transition, digital decode, image scale and OSD superposition, then send to LVDS level
drive for LCD screen.
It can realize the functions of PIP, POP and Multi-window in N101.
32bit 256MHz

14
2. SGTV58xy
Audio signals and SIF are sent to N103(SGTV58xy) for stereo decode and AVC. SGTV58xy has ten
input channels for analog audio, audio of AV1. AV2 (AV1 and S-Video share the same audio
channel),YPbPr1, YPbPr2, D-SUB/DVI, USB/PVR are sent to N103, the signals are switched inside
the IC by the control of the software, the selected audio output through three ways. One way via
volume, treble and bass control, sound effect processing, then separate to left and right channel
and send to digital sound amplifier N106(TPA3210) amplifying, then send to speaker; one way also
separate to left and right channel and send to earphone amplifier N104(NJW1109) for volume
control and amplify, then send to earphone socket; the other way send to AV OUT.
Pin Description
92, 93: SDA, SCL
37, 38: left/right channel output to sound amplifier
34, 35: left/right channel of earphone
32, 33: AV OUT (right/left)
43, 44: USB audio (right/left)
51, 52, 47, 48: YPbPr 1,2 audio (right/left)
53, 54, 49, 50: AV IN (right/left)
57, 58: VGA audio (right/left)
59, 60: TV MONO
81: TV SIF input

15
3. TPA3120
The TPA3120 is a 25-W stereo class-D audio power amplifier.
Pin Description Pin Description
2 Standby control signal input 17, 18 Gain select for audio output
4 Mute signal input 15, 22 Audio output for left/right channel
5, 6 Audio input for left/right channel 13, 14 Power ground
8, 9 Analog ground 19, 20 Power

16
4. USB mode
AML7213
The AML7213 is an integrated system for multi-audio/video decoding, witch supports MPEG-1, MPEG-2,
MPEG-4 format. It has dual USB2.0 high-speed OTG ports that connect to digital camera, MP3 player
and other electric device. The AML7213 receives IR signal and supports YPbPr720P output and is used
for CRT, LCD, PDP, portable media players, etc.
To printer

17
Pin description:
INPUT:
PIN162 DP2 D+ signal input of USB2
PIN163 DM2 D- signal input of USB2
PIN173 DP1 D+ signal input of USB1
PIN174 DM1 D+ signal input of USB1
PIN189 IR input
OUTPUT:
PIN9 Pr
PIN12 Y
PIN15 Pb
PIN197 / PIN200 / PIN201 / PIN202 I2S audio output to NU8(CS4334)
OTHERS:
PIN51 / PIN52 crystal 27MHz
PIN185 I2C DATA
PIN186 I2C CLK
PIN208 power on reset pin for main IC
PIN168 OTG symbol of USB1, which indicate the situation of HOST or DEVICE, low level for
HOST and high level for DEVICE.
AML7213 trouble diagnosis
(1) no picture:
Please check firstly if the trouble is cause by the upgrade software, if YES, check if the upgrade
software matches to the main IC, because the three kinds of versions of AML3428, AML3278 and
AML7213 are not compatible. The module can’t work correctly with wrong version software and it
can’t upgrade the software through the USB port. You should unsolder FLASH and flash write the
new software through the flash write instrument.
Make sure the software is right and then check below:
Check if the
input powe
r
(5V) is normal
Remove the power (5V) fro
m
USB board and check if 5V o
f
output port is normal
Check 5V powe
r
output and 5V inpu
t
of USB board
Check if 5V powe
r
of USB is short
Check i
f
AML7213 12#
output Y signal
normally
Check if SDRAM
(NU3) 38# has
108M sine wave
N
1, NU3 and NU4 ma
y
abnormal, replace the
m
when the power supply is
normal
N
o
N
o
N
o
N
o
Yes
Yes
Yes Yes

18
(2) picture and operation are normal, but sound is abnormal:
5. Power mode
The unit adopt PHILP power manage IC, which can control the power and the power consumption
is lower than 1W at stand-by and it has the function of timer setup.
Working principle of power:
The input AC power via EMC filter and rectification circuit, it sent to PFC(power factor correct L6563)
to output DC400V, which will be separated into two ways, one way via standby circuit (isolation D/D
convert FSDH321) output 5V and 32V; another way via semi-bridge circuit(TEA1610T) output 24V,
18V, etc. At standby, power board send out Vsb(3.3V) to cut off 5VSC, 32VSC output by the control
of Standby signal and stop working of PFC circuit(L6563) and semi-bridge (TEA1610T). When turn
Check the back level
circuit of IC outpu
t
(short or joint soldering)
N
1 is abnormal, replace i
t
when the power supply is
normal
Check if NU8 5# 8#
output sound signal
Check if the back level
circuit of NU8 outpu
t
is short or open
Check if NU8
7# has +5
V
p
ower supply
Check if NU8 pin1-4
input high-low level
digital signal or sine wave
Replace NU8
Check the
p
ower supply
Replace
N
1
N
o
N
o
N
o
YesYes
Yes
Rectify isolation
backlight
amplifier
isolation
isolation