Xoceco PH-42HK6S, PH42K6S Schematic

PDP TELEVISION

PH-42HK6S

CONTENTS

Safety precautions………………………………………………………………………..…
Alignment instructions …………………………….…….…………………………………
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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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.

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 – bathroom, 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
narrow and in bad ventilation.

1.10 There is quite a number of circuits in PDP that are integrated ones. Please be on guard against

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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
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

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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-848 (VGA and HDMI signal generator)
CA210 (color analyzer)

2 Alignment flow-chart

The alignment flow-chart is shown as fig-1

IF channel AFT voltage of TV and AGC voltage adjustment

Check DDC, HDCP KEY, FLASH

Combined test for general assembly

Factory initialization setup

White balance adjustment

Fig-1 adjustment flow-chart

3 Unit adjustments

Connect all the boards according to wiring diagram, connect with power and observe the display.
Method for entering factory menu: press “INPUT”, “2”, “5”, ”8” and “0” in turn to enter factory
menu; press “CH+” and “CH-” to select adjustment items and press “VOL+” and “VOL-” to adjust
value items, press “MENU” repeatedly to exit.

3.1 Initialization
Enter factory menu, select “OPTION” and “HOTEL OPTION” sub-menu, adjustment of items to see
table1.

Performance check

Preset ex-factory

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Table1 sub-menu adjustment

Items Preset Introduce

HOTEL 0 1: HOTEL OPTION of factory menu is optional

0: HOTEL OPTION of factory menu is not optional

LOGO 1 1: display LOGO in no signal or turn on

0: no LOGO display

ADC PRESCALE 00A adjust according the power consumption

SIF PRESCALE 000 adjust according the power consumption

BACK LIGHT 28 Adjust according the screen

ALL COLOR 1 1: white balance of each channel auto offset based on the HDMI white

balance

0: white balance of each channel adjust the offset base separately

ISP 0 0: no upgrade on line

1: upgrade on line

NO STANDY 00 01: turn on 00: memory function of turn on 10: standby

INIT VOLUME 0-100 Volume when turn on

INIT CHANNEL 1-200 Channel when turn on

INIT SRC Program source Input Source when turn on

EEPROM-MEMORAY

RECALL

> EEPROM Initialization (operate when EEPROM data chaos)

3.2 Adjustment for AFT and AGC of IF channel in TV

3.2.1 IF AFT adjustment
Disconnect J601(B face), input 80dB 38.9MHz PAL signal to the pole of J601 near the socket,
adjust L604 to value 1.65V of TP602, enter the factory menu, set TDA4470 from BG to LL and input
80dB 33.9MHz SECAM signal, adjust RP602 to value 1.65V of TP602, then weld J601.

3.2.2 IF AGC adjustment
Input 184.25MHz RF signal of 60dB to RF terminal, adjust RP601 to value 4V of TP604, and there
should be no obvious snowy picture. Increase the input signal to 90dBV and it should be no obvious
noisy.

3.3 White balance adjustment

3.3.1 HDMI white balance adjustment
a. Input VG-848 signal to HDMI: TIMING854(800*600/60Hz)of PAT920 8 gray scale signal,

adjust the balance with CA210.

b. Enter COLOR TEMP sub menu and select color temperature of standard (9300K), the

value of coordinate is recommended.

c. Fixed B GAIN, adjust R GAIN, G GAIN to let the color coordinate of the seventh level be
(285,293); Fixed BOFF, adjust R OFF, G OFF to let the color coordinate of the second level be
(285,293) and the brightness is about 3nit-10nit. Repeat adjust R GAIN, G GAIN, R OFF and G OFF,
until the color coordinate of the two level gray scale be (285,293).

3.3.2 VGA/YPbPr/ AV white balance check and correct

a. Connect VG-848 signal of VGA to VGA terminal and input TIMING854 (800*600/60HZ)
(PATTERN: CROSS), and auto adjust to full screen then input PAT948 white and black signal, enter
submenu of ADC ADJ, select AUTOTUNE and wait for OK display. Input PAT920(8 gray levels),

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check if the white balance is normal, if not, set ALL COLOR to 0 and fine adjust according the
method of 3.3.1

b. connect VG-848 YPbPr signal to YPbPr terminal and input TIMING972(1080I/60Hz) PAT908
color bar(include back/white bars), enter submenu of ADC ADJ, select AUTOTUNE and wait for OK
display. Input PAT920(8 gray levels), check if the white balance is normal, if not, set ALL COLOR to
0 and fine adjust according the method of 3.3.2

c. Input AV signal(PM5518,8 gray scale) to VIDEO terminal and check if the white balance is
normal, if not, set ALL COLOR to 0 and fine adjust according the method of 3.3.2.
Note: it can’t set back to 1 once ALL COLOR changes to 0.

4. Software upgrading:

Enter factory menu and select “OPTION”, set ISP to 1 and you can upgrade the software on line.
After upgrade, it needs to set ISP back to 0. if it can not display the image during the upgrading, join
J201 on main board, then perform the upgrading, when upgrade finish, disconnect J201 again.

5 Performance check

5.1 TV function
Enter searching menu → auto search, connect RF-TV terminal with central signal source and check
if the picture is normal, if there are channels be skipped. Check TXT and parental control function.

5.2 AV/S, YPbPr terminals
Input AV/S, YPbPr / YCbCr HD signals, check if it is normal.

5.3 VGA terminal
Insert VGA terminal, input VGA format signal of 640X480@60 Hz and check if the display is normal.

5.4 HDMI terminal
Insert HDMI terminal, input 640X480@60Hz signal, check if the display is normal. Check HDCP
function.

5.5 check sound channel
Check the speaker and earphone of each channel.

5.6 RS232 terminal
Insert the earphone wire to COM port, check the long-distance control function with special test
software.

5.7 other function check
Check the asleep timer, picture/sound mode, OSD, freeze/mute, stereo, etc.

5.8 presetting before ex-factory

Item Setting Item Setting Item Setting

PICTURE MODE STANDARD

COLOR MODE NORMAL

AFC ON SLEEP TIMER OFF OSD VPOSITION 50

ZOOM FULL TTX LANGUAGE WEST OSD HALFTONE 50

SOUND MODE STANDARD OSD DURATION 15

AVC OFF

BALANCE

VOLUME

50

50

OSD LANGUAGE

OSD HPOSITION

English

50

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Working principle analysis of the unit

The RF signal received by antenna will be sent to tuner TUN601, then IF signal will be obtained
through high amplified and mixed frequency. After pre-intermediate amplified by V608, it will be sent
to acoustic surface-wave Z605 to do IF filter and get better IF characteristics, then it will be sent to
N602 (TDA4470) to do intermediate amplification, phase-lock loop VCO and synchronous wave
detection to get the video signal TV-V; after pre-intermediate amplification IF will also be sent to
acoustic surface-wave Z604 to do filter at the same time, the it will be sent to N404 to do
intermediate amplification and output the second sound intermediate frequency signal TV-SIF.

TV-V output from TDA4470 and TV-SIF will be sent to the main IC N304(MST9E89DL)

Video and audio signals of AV/S, VGA, YPbPr will be sent to MST9E89DL too.

3 groups HDMI after PS321 selecting, their video and audio signal will be sent to MST9E89DL.

RGB of SCART1, AV, S-Y and S-C of SCART2 will also be sent to MST9E89DL, their audio
signal and YPbPr, AV/S audio signal via audio switch HEF4052BT selection to MST9E89DL.

The main IC N304(MST9E89DL) is a high performance and fully integrated IC, which can
realize HDMI interface processing, video decoding, video switch selection, A/D and D/A conversion,
interlace/de-interlace processing, modes conversion, OSD and low-voltage differential output, etc.
And it also has functions of audio selection, processing and MCU.

The video signal via MST9E89DL processing, output 4 pairs differential signal and 1 pair clock
signal for PDP panel display. TV-V from TDA4470 after video double amplifying and sent to
SCART1 as AV-OUT. AV processed by MST9E89DL after quadruple amplifying and output as
AV-OUT and SCART2 AV-OUT.

The audio signal via MST9E89DL processing, it will be sent to N206 (BH3547F) amplifying to
earphone. The audio signal will also sent to sound amplifier N203 (TPA3120-D2) amplifying to
speaker. TV-L/R processed by MST9E89DL will be sent to SCART1 for AV-OUT, at the same time,
TV-L/R and AV-L/R will output together as the audio output of AV-OUT and SCART2 AV-OUT.

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Block diagram

Block diagram

HDMI 1/2/3

VGA
L/R-VGA
YPbPr
(DTV)

SCART1-RGB
SCART1-AV
SCART1-L/R
SCART2-L/R
L/R-YPbPr
L/R-AV/S
SCART2-Y

EDID
24C02

PS321

EDID
24C02

PDP TV

DDR

FLASH

EEPROM

CONTROLLER

AUDIO SW.
HEF4052

MST9E89DL

HDCP KEY

PANEL

SCART2-C

AV

S-VIDEO

TUNER

TV-V

TV-SIF

AV-L/ R

SCART1-V OUT TV-L/R
SCART2-L/R OUT

AV-L/R OUT

AV OUT CVBS

SCART2-V OUT

SAW

IF AMP
TDA4470

2*AMP

4*AMP

SCART1-L/R OUT

AUDIO AMP .
BH3547F

AUDIO AMP .

TPA3120D2

EAR PHONE

SPEAKER

TV-L/R

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IC block diagram

1. MST9E89DL

The MST9E89DL is a high performance and fully integrated IC for multi-function LCD monitor/TV
with resolutions up to full HD (1920x1080). It is configured with an integrated triple-ADC/PLL, an
integrated DVI/HDCP/HDMI receiver, a multi-standard TV video and audio decoder, two video
de-interlacers, two scaling engines, the MStarACE-3 color engine, an on-screen display controller,
an 8-bit MCU and a built-in output panel interface. By use of external frame buffer, PIP/POP is
provided for multimedia applications Furthermore, 3-Dvideo decoding and processing are fulfilled
for high-quality TV applications. To further reduce system costs, the MST9E89DL also integrates
intelligent power management control capability for green-mode requirements and spread-spectrum
support for EMI management.

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2. TDA4470

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