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PDP TELEVISION




PH-50HU31
CONTENTS


Safety precautions...................................................................................... 1
Alignment instructions ................................................................................ 3
Method of software upgrading....................................................................... 6
Working principle analysis of the unit...............................................................12
Block diagram.............................................................................................13
IC block diagram.........................................................................................14
Wiring diagram ........................................................................................ 20
Troubleshooting guide ................................................................................ 21
Schematic diagram.................................................................................... 26
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
Please read the "Points for attention for the Maintenance & Repair of PDP" and "Criterion for
Identifying the Defects on Screen" as below, before inspecting and adjusting the TV set.

1. "Points for attention for the Maintenance & Repair of PDP"
To avoid possible danger, damage or jeopardy to health and to prevent PDP screen from new
damage, the maintenance people must read the following carefully. If they ignore the following
warnings, there will be deathful risks:
1.1 Screens vary from one model to another and therefore not interchangeable. Be sure to use the
same type of screen in the replacement.
1.2 The operation voltage is approximately 350v for PDP module (including screen, driving circuit,
logic circuit and power module). If you want to conduct maintenance work on PDP module when the
set is in normal operation or just after the power is off, you must take proper measures to avoid
electric shock and never have direct contact or touch with the circuitry of the working module or
metal parts. That's because within a short time relatively high voltage still remains on the capacitor
of the driving part even after the power is off. Make sure to begin relevant maintenance operation at
least one minute after the power is off.
1.3 Don't apply on the module any power supply that is higher than the specification. If the power
supply used deviates from the value given in the specification, there might be a possibility of leading
to fire or damage to the module.
1.4 Never have operation or mounting work under unsuitable environment such as areas in the
vicinity of water (bath room, laundry, water chute of kitchen), sources of fire, heat-radiation parts or
direct exposure to sunlight. Otherwise there will be kickbacks.
1.5 In case foreign substances such as water, liquid, metal slices or others fall into the module
carelessly power must be cut off immediately. Keep the module as it is and do not move anything on
the module. Otherwise it might be possible to contact the high voltage or cause shock short circuit
so that it may lead to fire or electric shock.
1.6 If there is smoke, abnormal smell or sound from the module, please cut the power off
immediately. Likewise in case the screen doesn't work when the power is on or during the operation,
please also cut off the power at once. No more operation in this case.
1.7 Do not remove or plug its connection wire when the module is in operation or right after the
power is off. That's because there remains a relatively high voltage on the capacitor of the driving
circuit. If there is a need to remove or plug in the connection wire, please wait at least one minute
after the power is off.
1.8 Considering the module has a glass faceplate, please avoid extrusion by external force lest it
should cause glass breakage that may get people injured. Two people are needed in cooperation to
move this module lest contingency takes place.
1.9 The complete TV set is designed on the basis of full consideration of thermal dissipation by
convection, with the round hole on the top for heat emission. To avoid overheat, please do not have
any covering on the hole during normal operation and never put it in the place where the space is

1
narrow and in bad ventilation.
1.10 There are quite a number of circuits in PDP that are integrated ones. Please be on guard
against static electricity. During maintenance operation be sure to cover yourself with anti-static bag
and before operation make sure to have it sufficiently grounded.
1.11 There are a big number of connection wires distributed around the screen. Please take care
not to touch or scuff them during maintenance or removing the screen, because once they are
damaged the screen will fail to work and it's not possible to repair it.
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.
1.12 Connector for the circuit board of the screen part is relatively fine and delicate. Please take
care in the replacement operation lest it should get damaged.
1.13 Special care must be taken during transportation and handling because strenuous vibration
could lead to screen glass breakage or damage on the driving circuitry. Be sure to use a strong
outer case to pack it up before transportation or handling.
1.14 Please put it for storage in an environment in which the conditions are under control so as to
prevent the temperature and humidity from exceeding the scope stipulated in the specification. For
prolonged storage please cover it with anti-moisture bag and have them piled and stored in one
place. The environmental conditions are tabulated as below:

Temperature Scope for operation 0~50centigrade
Scope for storage -15~60centigrade
Humidity Scope for operation 20%~80%
Scope for storage 20%~80%


1.15 If a fixed picture is displayed for a long time, difference in its brightness and color may occur
compared with movable pictures. But it doesn't show any problem and the reason is that there is
reduced density of fluorescent powder in the former. On the other hand, even if changes take place
in the picture, it can keep its brightness for a period of time (several minutes). It's a feature inherent
with plasma and it's not abnormal. However please try as much as possible to avoid showing a still
picture of high brightness for a long time during operation.
1.16 As a digitalized display devise, this module is provided with error diffusion technology and the
gray scale and false enhancement of contour can be displayed by reusing of sub-field. As compared
with cathode ray tube, it can be found in the moving picture that at the brim of the face of a person
there are some wrong colors.
1.17 During the display of graph (indicating the gradual change in brightness horizontally or
vertically) resulting from gray scale test it can be found that the brightness for the two adjacent
levels is uneven. This is caused by the reuse of sub-field, the display of load rectification and the
electrolysis.
1.18 The screen front plate is of glass. Please make sure that the screen has been put in place
during erection. If it is not in place before the erection begins it may lead to screen crack or
breakage.
1.19 Make sure the screw used in the mounting of the screen is of the original specs lest it should
cause damage to the screen due to mismatch. Special care should be taken not to use too long or


2
too big screw.
1.20 Care must be taken to guard against dust during assembling or dismantling, especially to avoid
dirt from falling in between the screen and the glass lest it should harm the receiving and viewing
effect.
1.21 There is piece of insulator stuck on the rear chassis corresponding to the power supply board.
It is used to isolate the cool part from the hot part. Please take care to keep it intact lest it should
become a potential safety trouble.
1.22 In addition to plasma screen, the glass is a part of high value. It has such functions as
anti-radiation, adjustment of color temperature etc. Please handle it carefully.


Alignment instructions
1. Test equipment
PM5518 (video signal generator)
VG-849 (VGA and HDMI signal generator)
CA210 (white balancer)
2 Alignment flow-chart
The alignment flow-chart is shown as fig-1

Check DDC, HDCP KEY, FLASH and POWER control IC



Factory initialization setup


IF channel AFT voltage of TV and AGC voltage


VGA, YPbPr ADC correction


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.
Method for software upgrading: enter factory menu and select "OPTION", set ISP to 1 or insert
jump wire J1, then you can upgrade on line. After upgrade, set ISP back to 0 or pull out jump wire
J1.
3
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 Software auto preset according the power consumption
SIF PRESCALE 000 Software auto preset according the power consumption
BACK LIGHT 13 Software auto preset 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
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 voltage and AGC voltage of IF channel in TV
3.2.1 IF AFT adjustment
Enter factory menu, set IF VCO to 1, or press "INPUT", "2", "5", "8", "1" to enter VCO
adjustment mode, disconnect J2, adjust LZ100 to value 2.5V of TP5(B face), then wed J2.
3.2.2 IF AGC adjustment
Input 184.25MHz RF signal of 60DBuv from RF terminal for china, and 175.25MHz for
America, adjust RZ133 to value 2V of TP1(B face) and there should be no obvious snowy picture.
Increase the signal to 90DBVuv and it should be display normally and no obvious noise.
3.3 White balance adjustment
3.3.1 HDMI white balance correct
a. Input VG-848 signal to HDMI: TIMING854(800*600/60Hz) 8 level gray scale of PAT920,
adjust the balance with CA210.
b. Enter COLOR TEMP sub menu and select color temperature of standard(9300K)
c. Fixed B OFF, adjust R OFF, G OFF to let the color coordinate of the second level be
283,297(CPT panel) and the brightness be 3nit ~10nit or so; Fixed B GAIN, adjust R GAIN, G GAIN
to let the color coordinate of the seventh level be 283,297(CPT panel). Repeat adjust R OFF, G OFF,
R GAIN and G GAIN, until the two color coordinate of the level gray scale be 283,297(CPT panel).
3.3.2 VGA/YPbPr 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 black/white 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

4
method of 3.3.2
b. connect VG-848 signal of YPbPr to YPbPr terminal and input TIMING972(1080I/60Hz)
PAT908 color bar(include back/white bar), 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 levels PAL for China and NTSC for America) to VIDEO 1
terminal, check if the white balance is 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 Performance check
4.1 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 CCD and V-CHIP function for
America.
4.2 AV/S, YPbPr terminals
Input AV/S, YPbPr/YCbCr HD signal, check if it is normal.
4.3 VGA terminal
Insert VGA terminal, input VGA format signal of 640X480@60 Hz and check if the display is normal.
4.4 HDMI terminal
Insert HDMI terminal, input 640X480@60Hz signal, check if the display is normal. Check HDCP
function.
4.5 check sound channel
Check the speaker and earphone of each channel.
4.6 RS232 terminal
Put the earphone line into COM terminal, check the long-distance control function with special test
software.
4.7 other function check
Check the turn on/turn off timer, asleep timer, picture/sound mode, OSD, freeze/mute,
stereo/SAP(for America), ect.
4.6 presetting before ex-factory

Item Setting Item Setting Item Setting
PICTURE MODE NAUTRAL OSD English/Chinese
COLOR MODE DK HALFTONE 50
SOUND MODE NEWS DURATION 15 VGA/HDMI STANDARD
NR WEAK ANTENNA CATV
ZOOM FULL Turn off channel TV




5
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 serial cable (25 pins) and one VGA cable (15 pins), the serial cable connects 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".




6
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.




7
Select




6) Select the document then the window will appear as shown below:



8
7) Press "Auto" to select the writing function.




Select the items shown in the picture above:
(a) Read File
9
(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.




10
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 easier to appear error when increase the speed, so it
need to select a suitable speed according the PC.




Step 1




Step 2




11
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 VZ100, then it
will be sent to acoustic surface-wave ZZ101 to do IF filter and get better IF characteristics, then it
will be sent to NZ100 (R2S1040) to do intermediate amplification, phase-locked loop VCO and
synchronous wave detection to get video signal TV-CVBS; after pre-intermediate amplification IF
will also be sent to acoustic surface-wave ZZ100 to do filter at the same time, then it will be sent to
NZ100 to do intermediate amplification and output the second sound intermediate frequency signal
(TV-SIF).
The TV-CVBS signal output from R2S1040 together with TV-SIF will be sent to main IC NS4
(MST9U88L). Video signal of AV1, AV2, S-VIDEO, YPbPr1 and YPbPr2 will also be sent to
MST9U88L; while the audio signal of them via audio switch NW200(HEF4052BT) selection to
MST9U88L (AV1 and S-VIDEO share one audio port). Video and audio signal of VGA, HDMI will be
sent to MST9U88L, too.
The main IC NS4(MST9U88L) is a high performance and fully integrated IC, which can realize
HDMI interface processing, video demodulating, video switch selection, A/D and D/A conversion,
interlace/de-interlace processing, modes conversion, OSD and low-voltage differential output, ect.
And it also has functions of audio selection, processing and MCU.
The video signal via MST9U88L processing, output 4 pairs differential signal and 1 pair clock
signal for PDP panel display. Video signal of AV1, AV2, S-VIDEO and TV via initial selection and
processing, output video signal of AV-OUT, after double video amplifying, it will be sent to AV-OUT.
Audio signal via MST9U88L processing, output two ways; one way will be sent to sound
amplifier NA6 (MP7722DF) amplifying, then sent to speaker. At the same time, it also sent to
earphone sound amplifier N350 (BH3547F), after amplifying then sent to earphone. Another way
will be sent to D/A converter NS6 (CS4344) through I2S bus, convert to analog sound signal L/R
output through AV-OUT.




12
Block diagram

POWER MEG.
ATMEG8L

EDID EDID
24C02 24C02


HDMI DDR

VGA

FLASH
YPbPr1
YPbPr2
LCD TV EEPROM

AV1-V CONTROLLER
AV2-V HDCP KEY
S-Y MST9X88LD
S-C


VGA-L/R PANEL

YPbPr1-L/R AUDIO SW.
YPbPr2-L/R HEF4052
AV1-L/R AUDIO AMP.
AV2-L/R MP7722



TUNER SAW
SPEAKER

TV-V
IF AMP
R2S10401 TV-SIF HP AMP HEAD
BH3547F PHONE

CVBS
V-AV OUT 2*AMP IIS
D/A L/R-AV OUT
CS4334




13
IC block diagram
1. MST9U88L
The MST9U88L is a high performance and fully integrated IC for multi-function LDC monitor/TV with
resolutions up to SXGA/WXGA. 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. With external frame buffer, 3-D video decoding and processing are
fulfilled for high-quality TV application. To further reduce system costs, the MST9U88L also
integrates intelligent power management control capability for green-mode requirements and
spread-spectrum support for EMI management.




14
Pins description:
4, 5, 7, 8, 10, 11, 1, 2: HDMI input
16, 17: horizontal/vertical synchronous input
27, 25, 22: RGB input
30, 32, 35: YpbPr2 input
41, 44, 46: YpbPr1 input
48, 49: S-VIDEO input
54: AV1-V input
55: AV2-V input
57: TV-CVBS input
59: CVBS output(AVOUT-V)
71, 72: VGA-L/R input
73, 74: AV1(S)/AV2/ YpbPr1/ YpbPr2-L/R input
178: search program synchronous test input
188: HDMI hot-plug test output
189: image switch output
192: backlight control output
193: panel voltage contort output
85, 86: L/R output
234,236,238,239: I2S bus(AVOUT-A)
199-208: 4 pairs differential signal and 1pair clock signal output
174: SDA
175: SCL



2. R2S10401
R2S10401SP is a semiconductor integrated circuit consisting of PLL split-carrier VIF/SIF signal
processing system compliant with PAL.




15
16
Pin description:
1, 2: VIF input 10: TV-SIF output
23: SIF input 17: SDA
7: TV-CVBS output 18: SCL



3. MP7722DF
The MP7722 is a stereo 20W Class D Audio Amplifier. It is one of MPS'second generation of fully
integrated audio amplifiers which dramatically reduces solution size by integrating the following:
180m power MOSFETs
Startup / Shutdown pop elimination
Short circuit protection
Mute / Standby
The MP7722 utilizes a single ended output structure capable of delivering 2 x 20W into 4speakers.
MPS Class D Audio Amplifiers exhibit the high fidelity of a Class A/B amplifier at efficiencies greater
than 90%. The circuit is based on the MPS' proprietary variable frequency topology that delivers low
distortion, fast response time and operates on a single power supply.




17
18
Pin description:
1, 7: L/R input
19, 14: L/R output
6, 10: mute control input




19
Wiring diagram




down

up




down



up

IF adjustment




down

up




20
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


21
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




22
2. Troubleshooting guide
2.1. No raster

Turn on power supply, check yes
if the red indicator is light in
the STANDBY?

no


Check if X303 PIN3 (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 PIN27 of X304
Check STANDBY circuit of
on 01 board is high-level?
power supply board




no yes

no
Replace 01 board Check if the PIN11 of X303 in
main board is high-level?

yes
Check if Va, Vs of X5203,
no
X5204 on the power board Replace Check power
is normal? N102 supply board

yes


Check the Check the panel
power board




23
2.2. 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 is no signal
initialization EEPROM, of channels?
Replace then turn off the TV,
main board no turn on again, display
TV Replace
picture?
main board
yes

Adjust main board
again
Check if 1VPP signal
yes and noise wave of
XB201 11# on the TV
board?


no


Check if output IF
Replace TUNER1 no signal of TUNER1
(pin 11) is normal?


yes

Check IF (NZ100)
and its periphery




24
2.3.no sound (TV input)

Check if PIN2, 8, 13 and Check PIN3 and
yes yes
18 voltage of NA6 is PIN7 output wave of Replace NA6
normal? NA6

no
no

Check power board
Check PIN10 wave of
yes Replace NS4
NZ100



no

yes Replace NZ100
Check PIN11 wave of
TUNER1

no

Replace TUNER1




25
main board
main board
main board
main board
analog board
key board
IR board
AV board
power
power
APPENDIX-A: Main assembly 9350HU3119
NAME NO. MAIN COMPONENT AND IT'S NO.
NZ100 R2S10401 (5271040101)
Analog board 6HU0595310
NA6 MP7722DF (5277722001)
Main board 6HU05901A0 NS4 MST9U88L (5270988001)
Interface connection board 6HU0544610
Key board 6HU0670510
IR board 6HU0670910
Power filter board 6FK0105110
Power board 6HU0592010
Remote control 6010Y04600 RC-Y46
Panel 5205503204 PDP50X4P
APPENDIX: EXPLODED VIEW PH50x31
PART LIST OF EXPLODED VIEW

NO. DESCRIPTION
1 front cabinet
2 panel
3 filter glass
4 upsh board (left)
5 upsh board (upper1)
6 upsh board (upper2)
7 push board (right)
8 connection of panel
9 analog board
10 CPU board
11 power switch bracket
12 key board
13 wall mounting bracket
14 back cabinet
15 back baffle
16 speaker back cover (left)
17 speaker back cover (right)
18 stand
19 speaker
20 IR board
21 power cord
22 main frame
23 decorative bar
24 push board (below1)
25 push board (below2)

Note: design and specifications are subject to change without notice.
9350HU3119
Ver.1.0