Sanyo LCD-19R30 User manual

LCD TV
SERVICE MANUAL LCD-19R30
PRODUCT CODE No.
REFERENCE No.:SM0915068
1 682 348 10: P/S BG/DK/I
FILE NO.
PRODUCT CODE No.

CONTENTS
Safety precautions…………………………………………………………………1
Alignment instructions……………………………………………………………..3
Software upgrade method…………………………………………………………8
Block diagram………………………………………………………………………10
IC block diagram……………………………………………………………………11
Troubleshooting guide……………………………………………………………..12
Schematic diagram………………………………………………………………...20
APPENDIX-A: Assembly list
APPENDIX-B: Exploded view

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
Attention: This service manual is only for service personnel to take reference with. Before
servicing please read the following points carefully.

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 ~ +50oC
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 equipments
 Digital Multimeter
 Signal Generator (54200)
 Personal Computer (FLASH writing tool pre-installed)
 VG848 & VG849 (VGA, YPbPr, HDMI signal generator)
 DVD player with HDMI jack
 CA210 (white balancer)
 Monitor
2. Power voltage test and alignment flow chart
2.1 Power voltage test
According to wiring diagram connect all boards correctly. Connect power and press POWER button
to turn on the TV.
In turn measure XJ01 all pin voltage. The data is shown below (Table 1).
Table 1: XJ01 all pin voltage
XJ01 Pin1 2 3 4、5 6、78 9 10 11 12 13
Voltage >2.5 V 0～3.3 V 0 11.4 V～12.6 V 0 31.4 V～32.6 V 4.75 V～5.25 V 0 4.75 V～5.25 V 0 >2.5 V
2.2 Alignment flow chart (Fig.1)
Defaults
p
reset
Check accessor
y,
then
p
ack the TV
Check if HDMI in
p
ut is normal. Check all the function at this mode.
Check if VGA in
p
ut is normal. Check VGA mode analo
g
control
,
H/V-center
,
etc.
Check if DDC
,
FLASH
,
KE
Y
is written
Data
p
rocess board makin
g
Com
p
lete set ali
g
nment
Input signal and check all TV function (no lost program, analog
control be normal). Check earphone and speaker output is normal.
Check if YPbP
r
in
p
ut is normal
Check if AV/SVIDEO
/
SCART in
p
ut is normal
White balance ali
g
nment

4
3. Alignment instructions
3.1 Complete set alignment
3.1.1 According to wiring diagram connect all boards correctly. Power on the TV, check if the display
is normal.
3.1.2 Factory menu usage
a) First press “INPUT” button, then in turn press “2、5、8、0” to access factory main menu.
b) Press “” and “” to select item, then press “” to access.
c) Press “” and “” to move upward or downward and select item.
d) Press “” and “” to adjust.
e) Press “MENU” to return to the previous screen.
3.2 White balance adjustment
3.2.1 Preparations before adjustment
Before white balance adjustment, let the TV work for more than 30 minutes so the TV will be in
stable status. Then use white balancer CA210 to adjust.
a) When adjusting in VGA mode, input VESA800×600/60Hz (for VG848 Timing, input 854) format
signal with crosshatch pattern. Go to user menu, select VGA Settings from Setup menu, then select
Auto to perform auto correction so that the picture can be displayed wholly. Then input signal from
VG848 with PATTERN of 914, go to factory menu and select ADC ADJUST to perform AUTO ADC
until “Complete” appears.
b) When adjusting in YPbPr mode, first input 480i/60 Hz format signal with 75% color bar plus gray
scale (VG848 Timing, input 968, PAT 918). Go to factory menu, select ADC ADJUST to perform
AUTOADC until “Complete” appears.
c) In this chassis only perform NORMAL color temperature alignment. During alignment please
guarantee that bright step’s color temperature to be △X≤±5, △Y≤±5, dark step color
temperature to be △X≤±10, △Y≤±10. Depending on different LCD panel type (non-TN panel
& TN panel), the color temperature requirement is different. See below table 2.
Panel type Cool Normal Warm
Non-TN panel 12000K（272、278）9300K（285、293）6500K（313、329）
TN panel 10000K（280、288）8000K（295、305）6500K（313、329）
Table 2: Color temperature requirements

5
3.2.2 Four channels white balance adjustment
3.2.2.1 For AV channel (TV/S-VIDEO/SCART is the same)
Through AV channel, input 8-step gray scale signal (VG848 Timing, input 969, PAT 920), go to
factory menu and access Color Temperature menu page, fix G-GAIN, adjust R-GAIN and B-GAIN to
make the 7th step chromaticity coordinates be (295, 305). Fix G-OFFSET, adjust R-OFFSET and
B-OFFSET to make the 2nd step chromaticity coordinates be (295, 305). In this way repeatedly
adjust R-GAIN, B-GAIN and R-OFFSET, B-OFFSET until both the first and second steps’
chromaticity coordinates be (295, 305).
3.2.2.2 For DVI channel (HDMI is the same)
Through DVI channel, input 8-step gray scale signal (VG848 Timing input 854, PAT 920), go to
factory menu and access color temperature menu page, fix G-GAIN, adjust R-GAIN and B-GAIN to
make the 7th step chromaticity coordinates be (295, 305). Fix G-OFFSET, adjust R-OFFSET and
B-OFFSET to make the 2nd step chromaticity coordinates be (295, 305). In this way repeatedly
adjust R-GAIN, B-GAIN and R-OFFSET, B-OFFSET until both the first and second steps’
chromaticity coordinates be (295, 305).
3.2.2.3 For YPbPr channel
Through YPbPr channel input 8-step gray scale signal (VG848 Timing, input 968, PAT 920), go to
factory menu and access color temperature menu page, fix G-GAIN, adjust R-GAIN and B-GAIN to
make the 7th step chromaticity coordinates be (295, 305). Fix G-OFFSET, adjust R-OFFSET and
B-OFFSET to make the 2nd step chromaticity coordinates be (295, 305). In this way repeatedly
adjust R-GAIN, B-GAIN and R-OFFSET, B-OFFSET until both the first and second steps’
chromaticity coordinates be (295, 305).
3.2.2.4 For VGA channel
Through VGA channel input 8-step gray scale signal (VG848 Timing, input 854, PAT 920), go to
factory menu and access color temperature menu page, fix G-GAIN, adjust R-GAIN and B-GAIN to
make the 7th step chromaticity coordinates be (295, 305). Fix G-OFFSET, adjust R-OFFSET and
B-OFFSET to make the 2nd step chromaticity coordinates be (295, 305). In this way repeatedly
adjust R-GAIN, B-GAIN and R-OFFSET, B-OFFSET until both the first and second steps’
chromaticity coordinates be (295, 305).

6
4. Performance check
4.1 TV function check
Input RF signal. Open the user menu and first go to Channel menu, perform auto scan to check if
there is any program lost. Check speaker output normally and picture is displayed normally.
4.2 AV/SVIDEO/SCART input check
Respectively input signal through AV/SVIDEO/SCART, check if picture and sound are normal.
4.3 YPbPr/YCbCr input check
Respectively input all format YUV signal (shown at below table 3) by VG848 signal generator and
check picture display and sound are normal.
Table 3: Component (YUV) signal format
# Resolution H-freq.
kHz V-freq. Hz Dot-clock freq. MHz Remarks
1 712×[email protected]/60 Hz 15.734 59.94/60 13.50 480i(59.94/60p)
2 702×574@50Hz 15.625 50 13.50 576i/50
3 720×[email protected]/60 Hz 31.469 59.94/60 27.00 480p(59.94/60p)
4 720×576p@50 Hz 31.25 50 27.00 576p/50
5 1280×720@50 Hz 37.50 50 74.25 720p/50
6 1280×[email protected]/60 Hz 44.96 59.94 74.18 720p(59.94/60p)
7 1920×1080i@50Hz 28.125 50 74.25 1080i/50
8 1920×[email protected]/60 Hz 33.75 59.94 74.25 1080i(59.94/60i)
9 1920×[email protected]/24 Hz 27.00 23.98/24 74.25 1080p(23.98/24p)
10 1920×1080p@50Hz 56.25 50 148.50 1080p/50
11 1920×[email protected]/60 Hz 67.50 60.00 148.50 1080p(59.94/60p)
4.4 VGA input check
Respectively input all format VGA signal (shown at below table 4) by VG848 signal generator.
Check if the display and sound are normal. If picture has deviation in horizontal and vertical
direction, perform auto correction by making use of Setup menu/VGA Settings/Auto item.
Table 4: PC signal format
# Resolution H-freq.
kHz V-freq. Hz Dot-clock freq. MHz Remarks
1 720×400@70 Hz 31.47 70.08 28.32 DOS
2 640×480@60 Hz 31.50 60.00 25.18 VESA
3 640×480@72 Hz 37.90 72.00 31.50 VESA
4 640×480@75 Hz 37.50 75.00 31.50 VESA
5 800×600@60 Hz 37.90 60.00 40.00 VESA
6 800×600@70 Hz 46.90 72.19 49.50 VESA
7 800×600@75 Hz 48.08 75.00 50.00 VESA

7
8 1024×768@60 Hz 48.40 60.00 65.00 VESA
9 1024×768@70 Hz 56.50 70.00 75.00 VESA
10 1024×768@75 Hz 60.00 75.00 78.75 VESA
11 1360×768@60 Hz 47.71 60.01 85.50 VESA
4.5 HDMI input check
Respectively input all format HDMI signal (shown at below table 5) by VG849 signal generator,
check if picture display and sound are normal.
Table 5: HDMI signal format
# Resolution H-freq. (kHz) V-freq. (Hz) Dot-clock freq.
MHz) Remarks
1 712×[email protected]/60 Hz 15.734 59.94/60 13.50 480i(59.94/60p)
2 702×574@50Hz 15.625 50 13.50 576i/50
3 720×[email protected]/60 Hz 31.469 59.94/60 27.00 480p(59.94/60p)
4 720×576p@50 Hz 31.25 50 27.00 576p/50
5 1280×720@50 Hz 37.50 50 74.25 720p/50
6 1280×[email protected]/60 Hz 44.96 59.94 74.18 720p(59.94/60p)
7 1920×1080i@50Hz 28.125 50 74.25 1080i/50
8 1920×[email protected]/60 Hz 33.75 59.94 74.25 1080i(59.94/60i)
9 1920×[email protected]/24 Hz 27.00 23.98/24 74.25 1080p(23.98/24p)
10 1920×1080p@50Hz 56.25 50 148.50 1080p/50
11 1920×[email protected]/60 Hz 67.50 60.00 148.50 1080p(59.94/60p)
Note: A DVI device also can be connected to the HDMI jack by using a DVI to HDMI adapter cable.
About supported DVI signal format, please refer to table 4 PC signal format and table 5.
4.6 HDMI sound supporting format
HDMI sound only supports PCM format, its sample rate supports 32 KHz, 44 KHz and 48 KHz.
5. Default setting for user menu
Go to factory menu “User Menu Init” item, press ENTER button on the remote control, then the TV
will preset all settings to default. After factory alignment, this step must be done surely.
6. Packing
Check accessory then pack the TV.

8
Software upgrade method
1 Using USB port to upgrade (it is suggested to use this method in preference)
1.1 Precautions
The upgrade file must be saved under root category of USB device, and the file name must be
changed to “KU19P.BIN” or “ku19p.bin”.
1.2 Upgrade steps:
a) Copy the provided “KU*.bin” file to USB device root category. Then change the file name to
“ku19p.bin” or “KU19P.BIN”.
b) Completely cut off the TV power by unplug the power cord from the power outlet. (Be sure to use
buttons on the remote control or on the TV to completely discharge the TV after power off).
c) Insert the USB device into the USB port. Keep holding any button (except POWER button) on the
TV and then plug the power cord into the power outlet, after about 2-3s release the button, the
software begins to upgrade automatically. Note that during upgrade the USB device can not be
removed and the TV can not be power off.
d) During the process operate according to hints provided on the screen. When complete, remove
the USB device, unplug the power cord and then plug it again, then press POWER to turn on the
TV.
e) After software upgrade the TV must be performed initialization and ADC correction and white
balance alignment again. Below are steps for initialization:
ⅰ. Go to factory menu, select the third item “Feature & Adjust”.

9
ⅱ. Go to “Feature & Adjust” sub-menu, select “EEPROM Init” at the first line.
ⅲ. Press “” (RIGHT arrow button) to perform initialization. During the process the message
“Please Wait” will be displayed. When complete, “OK” is displayed.

Block Diagram
10

GENERAL DESCRIPTION
The MST6E16GS 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, 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 interface. By use of external frame buffer, PIP/POP is
provided for multimedia applications. Furthermore, 3-D video decoding and processing are
fulfilled for high-quality TV applications. To further reduce system costs, the MST6E16GS also
integrates intelligent power management control capability for green-mode requirements and
spread-spectrum support for EMI management.
IC block diagram
11

Troubleshooting Guide
Common-trouble judging flow chart
Connect the power.
Check if the indicator
lights red.
Yes, then press
POWER button.
Check if the indicator
lights blue.
Yes
Check if the screen
lights up.
Yes
Check if every source
video display is normal.
Check if every source
sound is normal.
No
Check if power supply or
infrared sensor board has trouble,
or power cord problem.
No
Check if main chip (MST6E16)
pin44 waveform is sine wave,
FLASH pin6 waveform is square-
wave. Check main chip peripheral
circuit and FLASH/EEPROM
peripheral circuit.
Check backlight board, then
check main chip pin81 backlight
control status.
No
Check if signal from its
input to IC pin is normal. If
normal, then check IC and
its periphery, and LVDS
output.
No
Check if signal from its
input to IC pin is normal.
If normal, then check IC
and its periphery
No
12

1. No raster (screen is not lit), no picture, no sound
No raster,
no picture & sound
Check if indicator lights up.
NoYes
Check if indicator
lights blue.
No Yes
Check Standby _ 5V
Normal Abnormal
Disconnect power
board and Data
process board, then
test Standby _ 5V
again.
Normal Abnormal
Check main chip
pin 156 LED
control status.
Check main chip
(NS01), FLASH
(NS02) power.
NormalAbnormal
Power board
exists
problem.
Check circuit of
infrared sensor board.
Check main chip and
FLASH periphery.
Check if main chip pin169
(reset receiving signal) is of
low level.
Yes No
Check NS01, confirm NS01
has reset correctly.
Check NS01, NS02, NS04,
NS05 and its periphery.
No Yes
Check NS01 pin 44 waveform
is sine wave or not.
Check NS01 crystal
oscillator circuit.
Note: If detect NS01 (main chip) pin 169 is of high level, you may remove RS14, detect VS01
emitter if first output high level after power on, then output low level continuously. If not, the reset
circuit may have problem. First detect if NS01 (main chip) pin 44 waveform is sine wave, if not,
check NS01 crystal oscillator circuit. When checking periphery of NS01, NS02 and NS05, check
relative component’s welding, then use oscilloscope to detect the joint resistor pin between NS01
and NS05. If the waveform is not regular square-wave, that means either NS01 or NS05 work
abnormally and therefore cause address line and data line be in error. NS05 error probability is
greater. In addition, if joint resistor between NS01 and NS05 is in error, it will also cause no raster,
no picture and no sound.
13

2. Sound normal, but no picture
(blue screen and OSD can be displayed.)
Sound is OK,
but no picture.
Check backlight
is lit.
Yes No
Try other source, to
check the picture
display.
Check backlight
board, main chip pin
81 backlight control
status.
Yes No
Check NS01
and its
periphery.
Check according to
steps of 4. Picture
OK, but no sound.
Note: HDMI channel is excluded. For HDMI channel picture and sound check, please refer to procedure
of 5.
3. Sound OK, but no picture (only backlight lights up)
Sound is ok, but
only raster appears.
Check LVDS power
supply is normal.
Normal Abnormal
Check signal from NS01
to XS01 is normal.
Normal Abnormal
Panel LVDS
reception board
has problem.
Check NS01 power
supply and its
peripheral circuit.
Check NJ05 pin 2 is
low level or not.
Yes No
Check N402 circuit. Check NS01 pin 162
and its inverter circuit.
14

4. Picture normal, but no sound
Picture is OK,
but no sound.
No
Check main
board XV05 has
signal output.
Yes
Speaker problem
Check power amplifier
relative pins have square-
wave signal output.
NoYes
Check power
amplifier rear
stage peripheral
circuit.
Check CV18,
CV22 have signal
input amplification.
YesNo
Check NV06
corresponding
channel has signal
input.
Check power
amplifier’s peripheral
circuit, the power
supply and MUTE pin
circuit.
Yes No
Check NV06
peripheral circuit
and its power
supply.
Check every stage
circuit along the
audio input channel
15

4. Some source channel work abnormally.
Yes
Check CS30 has
signal input.
a) AV1 channel has no picture
No
Check NS01 peripheral
circuit, crystal oscillator
and its power supply.
The route from AV 1
socket to NS01 exists
problem.
b) channel has no picture
Check CS28 has
signal input.
Yes No
The route from SCART
CVBS socket to NS01
exists problem.
Check NS01 peripheral
circuit, crystal oscillator
and the power supply.
c) S-VIDEO channel has no picture
Check CS25, CS26
has signal input.
Yes No
Check NS01 peripheral
circuit, crystal oscillator
and the power supply.
The route from S-
VIDEO socket to NS01
exists problem.
16
SCART CVBS

Yes
Check LJ31 has
signal input.
d) TV channel has no picture
No
Check NS01
peripheral circuit,
crystal oscillator and
the power supply.
Check TUNER1 pin
11 has signal output.
NoYes
Check TUNER1
peripheral
circuit, power
supply and bus.
Check circuit
between
TUNER1 and
NS01.
e) channel has no picture
Check CS21, CS22, CS23,
CS24 have signal input.
Yes No
Check NS01 peripheral
circuit, crystal oscillator
and the power supply.
Check NB06 pin 4, pin 7,
pin 9 have signal output.
No Yes
Check NB06 pin 2,
pin 5, pin 11/3, pin 6,
pin 10 have signal
input.
No Yes
Check NB06
peripheral circuit,
the power supply.
17
Check channel
between NB06
output and NS01
input.
The route between
YPbPr/SCART RGB
socket and
NB06 exists problem.
YPbPr/SCART RGB

Yes
Check NS01 pin 29,
pin 30 have
synchronous signal
input.
e) VGA channel has no picture
No
Check CS17, CS18, CS19,
CS20 have signal input.
Check circuit
between VGA
socket and NS01.
Yes No
Check NS01
circuit.
Check circuit
between VGA
socket and NS01.
f) HDMI channel has no picture
Check NS01 has digital
signal input.
Yes No
Check NS01 peripheral
circuit, crystal oscillator
and the power supply.
Check circuit between
HDMI socket and
NS01.
Note: To get normal HDMI picture, especially when connect to DVD player with HDCP
information, it must be guaranteed that NV04 and NV05 (HDMI port DDC chip) writing
is correct, and especially bus between NV04, NV05 and HDMI jack must be smooth
and unhindered. Secondly HOTPLUG circuit must be guaranteed (it is of high level at
normal broadcast), otherwise the picture playback can not be normal.
18