Xoceco PH-42FB7 Schematic

PDP TELEVISION

PH-42FB7

America

CONTENTS

Safety precautions………………………………………………………………………..…

Alignment instructions …………………………….…….…………………………………

Method of software upgrading……………….…….……………………………………….…….

Working principle analysis of the unit……………………………….………….………….

Block diagram…………………………………..………………………………….…………

IC block diagram………………………………………………………………………..……

Wiring diagram …………………………………………………………………………….

Diagnosis for plasma screen……………………………………………………….……..

Troubleshooting guide ………………………………………………………………..……

Schematic diagram…………………………………………………………………………

APPENDIX: Exploded View

28 29 32 44

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

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.

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 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.

2. “Criterion for Identifying the Defects on Screen”

The PDP produced by our Company at present uses the following criterion for identifying the defective

points:

2.1 Model PS-42XX:

There may appear three kinds of defective points for this model as shown in Fig.1, i.e., bright spot

(remain bright); dark spot (non-illuminating); flickering spot (continuously flickering).

However they should not exceed the specification as in table 1. Otherwise the product shall be deemed

as sub-standard.

Zone B

W/4 W/2 W/4

Figure 1 Defective Points

Zone A

H/4

H/2

H/4

Table 1 Criterion for Three Kinds of Defective Points

Kind Area A Area B Remark Dark spots No more than 2 No more than 8

Bright spot No more than 1 No more than 2

Total number of defective points in A and B shall not exceed 8. The distance

Flickering spot No more than 1 No more than 2

between two defective points shall not be shorter than 15mm.

2.2 Model PH-42XX:

Table 2 Cell Defect Specifications

Defect

Number of Cell Defects (N)

►Total N≤4 [cells/full screen]

Non-Ignition

Dot*

+Unstable Dot*2)

A-zone

B-zone

►N≤2 [cells/each R,G,B screen]

►N=0 [adjacency of 2-cells/full-white screen]

►Total N≤11 [cells/full screen]

►N≤5 [cells/each R,G,B screen]

►N≤5 [adjacency of 2-cells/full-white screen]

=0[adjacency of 3-cells/full-white screen]

Uncontrollable

Dot*

Non-Extinguishing

Dot*

A-zone ►N≤1 [cells/each R,G,B screen]

B-zone ►Total N≤3 [cells/ full screen]

A-zone ►N=0

B-zone ►N=0

►Total sum of all defects N≤17 [cells/full-white screen]

Specification

Distance between two defects

(D)

►A-Zone:≥100mm

►B-Zone: N≤2

(100mm circle/screen: 2points

allowed)

►A, B Zone overlap: N≤2

(100mm circle/screen: 2points

allowed)

►N≤6, for the stain of which longer-axis length is 5mm or

Stain*

►N=0, for the stain of which longer-axis length is longer than

shorter.

►D≥50mm

5mm.

1) Non-Ignition Dot (Dark Defect) is defined as “A cell of which more than 50% area is not ignited”

2) Unstable Dot (Flickering) is defined as “A cell which repeats On and Off”

3) Uncontrollable Dot is defined as “A cell which is distinctly brighter or darker than other cells around it”

and/or “A cell of which color is distinctly different from that of other cells around it”

4) Non-Extinguishing Dot (brightness defect) is defined as “A cell of which more than 50% area is

always ON”

5) Stain is defined as “A blob due to local color contamination in white or simple color pattern”

●The decision distance is 3H away from the panel, intensity of illumination is between 100 Lux and 200

Lux.

V/4

A -Zone

(25% of display area)

B -Zone

(75% of display area)

V/2

V/4

H/4 H/2 H/4

2.3 Model PH-50XX:

There may appear three kinds of defective points for this model as shown in Fig.3 i.e., bright spot

(remain bright); dark spot (non-illuminating); flickering spot (remain flickering).

However they should not exceed the specification as in table 3. Otherwise the product shall be deemed

as sub-standard.

Table 3 Criterion for Three Kinds of Defective Points

Zone B

Figure 2 Defective Points

Zone A

H/4

H/2

H/4

W/4 W/2W/4

Item Kind Area A Area B Remark 1 Dark spots No more than 4 No more than 10

2 Bright spot No more than 1 No more than 3

Total number of defective points in A and B shall not exceed 14. The distance

3 Flickering spots No more than 1 No more than 3

between two defective points shall not be shorter than 10mm.

Alignment instructions

1. Test equipment

PM5515 (video signal generator) VG-849 (YUV, VGA, HDMI signal generator)

CA100 (white balancer)

2. The alignment flow chart (see below figure)

Connect with central signal source, then check each function of TV such as station missing, analog control etc., check the output of headphone and speaker

Input AV/SVIDEO signal, then check each function of all the terminals

Input HD signal (format), then check each function of the terminal

Input VGA, HDMI signal, check if the display is normal, check eac function such as analog control etc., check horizontal /vertical center etc.

3. Description of adjustment

3.1 Unit adjustment

To produce digital board and analog board

Check the accessories and pack them in box

Check DDC and FLASH

All testing

Adjust white balance

Preset ex-factory

Fig-1 adjustment flow-chart

Connect the digital processing board, analog board, power board, power filter board and button board according to the wiring diagram 203-PH42FB8-01JL. Connect with power and observe the display.

Method for using factory menu: press ”INPUT” button, then press”2580” to enter level one factory menu. Press ”CH+” and “CH-“ to select adjustment page, then press “OK” to access. Press “CH+”

and “CH-“ to move cursor up and down, when the cursor stays on a certain adjustment item, press “VOL-“ and “VOL+” to adjust. Press “MENU” exit to the level one factory menu; press “EXIT” to exit from the factory menu at any situation.

Note: channel switch isn’t available at adjustment menu, only after return to level one factory menu, you can switch channel.

3.2 adjustment of white balance

3.2.1 input 16 level gray-scale signal from VG849 to HDMI channel (TMIING: select a support format of HDMI), enter white balance adjustment page of factory menu, select cool color temperature of item, fixed WBGG_HDMI to 50H, adjust WBRG_HDMI, WBBG_HDMI, let the color coordinate of third level on the right be (270,283) at 120nits; fixed WBBO_HDMI to 50H, adjust WBRO_HDMI, WBGO_HDMI, let the color coordinate of third level on the left be (270,283) at 5nits. The brightness of 120nits and 5nits may obtain by adjusting the contrast and brightness of menu.

3.2.2 input 16 level gray-scale signal from VG849 to AV channel (TMIING:968), enter white balance adjustment page of factory menu, select cool color temperature of item, fixed WBGG_NTSC to 50H, adjust WBRG_NTSC, WBBG_ NTSC, let the color coordinate of third level on the right be (270,283) at 120nits; fixed WBBO_ NTSC to 50H, adjust WBRO_ NTSC, WBGO_ NTSC, let the color coordinate of third level on the left be (270,283) at 5nits. The brightness of 120nits and 5nits may obtain by adjusting the contrast and brightness of menu.

3.2.3 input 16 level gray-scale signal from VG849 to VGA channel (TMIING: select a support format of VGA), enter white balance adjustment page of factory menu, select cool color temperature of item, fixed WBGG_VGA to 128, adjust WBRG_ VGA, WBBG_VGA, let the color coordinate of third level on the right be (270,283) at 120nits; fixed WBGO_VGA to 128, adjust WBRO_VGA, WBBO_VGA, let the color coordinate of third level on the left be (270,283) at 5nits. The brightness of 120nits and 5nits may obtain by adjusting the contrast and brightness of menu.

3.2.4 input 16 level gray-scale signal of 480I from VG849 to YPbPr channel, enter white balance adjustment page of factory menu, select cool color temperature of item, fixed WBRG_YPbPr480I, WBGG_YPbPr480I, WBBG_YPbPr480I to 128, and WBRO_YPbPr480I to 128, adjust WBRO_YPbPr480I, WBBO_YPbPr480I, let the color coordinate of third level on the left be (270,283) at 5nits. The brightness of 5nits may obtain by adjusting the contrast and brightness of menu.

Input format signals separately list on table 1, repeat the operation above until the white balance pass muster.

Note: the white balance adjustment of VGA and YPBPR must be done at the situation that the white balance adjustment of HDMI is accurate.

4 Performance check

4.1 TV function

Connect RF-TV terminal to the central signal source, enter the setup menu→ auto search, check if there is station skipping, the output of earphone and speaker, the picture are normal.

4.2 AV/S-VIDEO terminal

Input AV/S signal, check if the picture and sound are normal.

4.3 YPbPr/YCbCr terminal

Input YUV signal (VG-849 signal generator), separate input YUV format signal of table 1 and check if the picture and sound are normal.

Table 1 YUV signal format

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

4.4 VGA terminal

Input VGA signal (VG-849 signal generator), separate input VGA format signal of table 2 and check if the picture and sound are normal. If the image is deflection of the H-field, select manual correction of Advanced Video Menu.

4.5 HDMI terminal

HDMI signal format receives the three high-definition signals: 480I, 480P, 720P/60Hz, 1080I/60Hz, except for the table 2 signal. Check if the image (contain HDCP ON and OFF) and sound are normal.

Table 2 VGA signal format

No Resolution H-frequency(kHz) V-frenquency(Hz)

1 720 X 400 31.469 70.086 28.322 IBM

2 640 X 480 31.469 59.94 25.175 IBM

3 640 X 480 37.861 72.809 31.5 VESA

4 640 X 480 37.5 75 31.5 VESA

5 640 X 480 43.269 85.008 36 VESA

6 800 X 600 35.156 56.25 36 VESA

7 800 X 600 37.879 60.317 40 VESA

8 800 X 600 48.077 72.188 50 VESA

9 800 X 600 46.875 75 49.5 VESA

10 800 X 600 53.674 85.061 56.25 VESA

11 1024 X 768 48.363 60.004 65 VESA

12 1024 X 768 56.476 70.069 75 VESA

13 1024 X 768 60.023 75.029 78.75 VESA

Point clock pulse

frenquency(MHz)

Remark

5 Ex-factory setting of user menu

1) Select TV channel, volume: 25

2) Video menu, Picture Mode: Nature, Aspect Ratio: Wide

3) Video menu, Advanced Video Menu: Noise Reduction——Spatial: On Noise Reduction——Speckle: Off Noise Reduction——Temporal: On Sharpness: 0

Tint: 50 Color Temperature: Cool 3D Y/C: On

4) Audio menu, Sound Mode: News, Balance: 31, Earphone Vo1:31 Digital Audio Output: AC-3, MTS: Mono

5) Setup menu, Tuning Band: Air

6) Feature menu, Sleep Timer: Off, Menu Language: English Note: Except for Color Temperature of Cool, the Advanced Video Menu of YPbPr/YCbCr and VGA channels sets according to the adjustment of factory.

Trouble shooting

Before servicing please check to find the possible causes of the troubles according to the table below.

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

2.TV set:

Symptoms Possible cause

Unable to switch the power on  Check to see if the power plug has been inserted

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

 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.

properly 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.

 Check is the screen position and size is correctly set up.

Symptoms Possible cause

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 signal types.

Picture too bright and there is distortion in the brightest area

Picture is whitish or too bright in the darkest area of the picture

No picture or signal produced from the displayer if “XXX in search” appears.

There appears an indication “outside the receivable scope)

Remote control cannot work properly

No picture and sound, but only

hash.

Blur picture  Check if the antenna cable is correctly connected.

No sound  Check if the “mute” audio frequency setting is selected.

When playing VHS picture search tape, there are lines at the top or bottom of the picture.

 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.

 Check if the setting for the brightness is too high  Possibly the brightness grade of DVD player

(broadcaster) is set too high.

 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.

 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.

 Check if the antenna cable is correctly connected, or if it

has received the video signal correctly.

 Of if it has received the right video signal.

 Check if the sound volume is set to minimum.  Make sure the earphone is not connected.  Check if the cable connection is loose.

 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

Method of software upgrading

1. Connect RS-232 cable to computer and TV set. The cable must be a female to female RS-232

cable, and the line is TXD to RXD and RXD to TXD cross-link. It’s popular for PC to PC

connection.

2. If the computer has no RS-232 serial port(e.g. Notebook PC),you needs a additional USB to serial

port cable.

3. Copy the update tools (iDev.exe) to the path you want to do it, and double click it.

4. Select “setup” menu.

5. Confirm the Serial port is right. Base on the port which using for update. And set the band rate to

115200 (default).

6. Select the “Image path” menu.

7. Confirm it’s the right file.

8. If it’s not right(Maybe you didn’t select it before),click the “…”button to select “*.ecc” file. Sometimes

the image file you got it will be “*.rar ”or “*.zip” zip file, needs unzip it first.

9. You also can click the setup button to select and config, but please don’t select the red

one(update boot sector).

10. Then click the “down” button.

11. You can see the “waiting” window.

12. Then power (off then) on the TV set.

13. After download, it will be burning.

14. Last it will be finished

15. Press the (IR/ locate keypad) power key and holding for several second to force power off TV set,

then power on again. It would be ok now. If it’s failure you can try once again.

Working principle analysis of the unit

1. NTSC signal flow: Antenna reception NTSC signal send to the integrative tuner FQD1236, which contains HF and IF amplifier circuit and video decoding circuit. It is controlled by main IC ZR39660 (inside CPU) through I2C bus. The NTSC signal via frequency tuning, HF amplification, IF amplification, system switching and decoding, output video signal TV-CVBS of 1Vpp and sound IF signal (SIF). TV-CVBS and AV1-CVBS, AV2-CVBS input from AV terminal, via switch IC HEF4052 to output signal, one way send to ZR39660 for VEDIO DECODER, DEINTERLACE and SCALER, then send to LVDS level drive for LCD screen, another way is output through AV output socket as AV OUT. The sound IF (SIF) is fed into demodulation IC CAS220, via decoding and A/D conversion, it is fed into ZR39660 for analog control in the format of I2S. ZR39660 outputs audio data of I2S format, it is fed into audio D/A converter IC CS4344, output analog L/R signal. The L/R signal and sound signal of PC/YPRPB via diverter switch HEF4052BT, send to R2S15900SP (sound processing and volume control). Select right/left sound channel, their send to digital sound amplifier TPA3001 amplify, then send to speaker.

2. ATSC signal flow: Antenna reception ATSC signal send to tuner FQD1236, after frequency tuning, HF amplification, IF amplification and SAW FILTER, output IF signal to demodulation chip CAS220, via VSB or QAM demodulation, Sound stereo decoder, fed to ZR39660 for information source decoding in the format of standard serial TS stream. HD video signal via decoding to A/D conversion and OSD superposition, at last send to LVDS drive level for PDP panel. HD audio signal, via decoder built-in ZR39660, resumed to multi- channel sound of Dolby AC-3, at the same time output data stream of I2S format and S/PDIF data stream. Audio data of I2S format is fed to audio D/A conversion chip CS4344 to output analog L/R signal. S/PDIF data stream directly output from optical fiber interface.

3. PC/YPrPb signal flow PC and two YPBPR signal via matched resistance, it a-c couple to video switch SN74CBT3257CDR, via switching to selected signal to Triple Video A/D Converter MST9883 A/D conversion. Send B/G/B of 24 bit to main IC ZR39660 digital decode, image scale and OSD superposition, then send to LVDS level drive for LCD screen. Sound signal (PC, YPrPb) via switch diverter HEF4052BT to output signal, it send to R2S15900SP (sound processing and volume control) switch of audio. Select right/left sound channel, their send to digital sound amplifier TPA3001 amplify, then send to speaker.

4. HDMI signal flow HDMI video signal is directly fed to main IC ZR39660 (with HDCP function of HDMI) digital decode, image scale and OSD superposition, then output LVDS drive level for screen. HDMI audio signal, via decoder built-in ZR39660,output data stream of I2S format and S/PDIF data stream at the same time. Audio data of I2S format is fed to audio D/A conversion chip CS4344 to output analog L/R signal. S/PDIF data stream directly output from optical fiber interface.

Block diagram

AV1 AUDIO

1 2 3 4 56

AV2 AUDIO

CVBS2

CVBS1

S_Y

S_C

R2S15900SP

HEF4052BT

CVBS_TV

NJW1109

TPA3001D1

D/A CS4344

SN3253C

YPBPR1 AUDIO

YPBPR2 AUDIO

PC AUDIO

FQD1236 MK5

TUNER

Analog SIF

Digital IF

CAS220CS

YPBPR1

SN3257C

YPBPR2

SN3257C

RGB/YUV

MST9883

Earphone

Loudspeaker

ZORAN PS-42J6

HS,VS,CLK

IIS IN

IIS OUT

CVBS,Y/C

24-BIT Data

HDMI

ZR39660

BGA400

AV_OUT

JEPICO

j-L003

LVDS

M29W320E

FLASH

2X16MX16

DDRAM

54321

V1.0

Panel

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