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Prima PS42D8 Service Manual

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PDP-TV
PS42D8
PH50D8

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Summary of Contents for Prima PS42D8

  • Page 1 PDP-TV PS42D8 PH50D8...

  • Page 3: Safety Instructions

    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 Instructions Please read the “Points for attention for the Maintenance & Repair of PDP”and “Criterion for Identifying the Defects on Screen”...
  • Page 4 should cause glass breakage that may get people injured. Two people are needed in cooperation to move this module lest contingency takes place. 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.
  • Page 5 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. 17).
  • Page 6 Zone B Zone A Figure 1 Defective Points 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 Total number defective points in A Bright spot No more than 1 No more than 2 shall...
  • Page 7 Item Kind Area A Area B Remark Dark spots No more than 4 No more than 10 Total number defective points in A Bright spot No more than 1 No more than 3 shall Flickering No more than 1 No more than 3 exceed spots distance...

  • Page 8: Method Of Software Upgrading

    5).Note: Except for the two items in the plant setup menu as above used for the white balance adjustment and the items 5,6,7 (for test of pattern, color collocation and degree of pure gray) in the calibrated menu that can be used to shoot trouble, no adjustment should be made for the other items.
  • Page 9 or the FlashUpgrader (on condition of window 98) After running the programs the following interfaces will appear: Based on the features of computer set up the serial port (COM Port) and select corresponding serial port (if it’s not possible to burnt-write other serial port can be used instead).
  • Page 10 B. Once it’s over with burnt-write, the cancel pushbutton will become flash. Switch off the main power and then to switch on the TV set again. Note: Do not switch the power or the set off in the course of burnt-writing. Otherwise it may result in the inability of the flash to burnt-write again.
  • Page 11 Briefing on the operation principle of the plasma TV series PS-42D8 Plasma plane screen technology represents the state-of-the-art and it’s also the best choice for high quality picture and large purely place screen. Plasma display screen PDP is a display unit employing gas discharge. This screen uses plasma tube as its light emission component.
  • Page 13 Among which:video decoder:VPC3230 Non-interlace conversion:PW1230 Ad conversion and DVI interface :AD9887 Audio treatment:MSP3440 Sound power amplification:D type power amplification of TI : Tpa3001 3D Y/C separation:uPD64083 CCD/V-CHIPdecoder:Z86229（For North America only） Below is a short introduction to the basic work process flow of model PS-42D8series: This TV model is based on dual MCU control of which the main MCU is PW181（N501, taking care of the operation of various chips (including image treatment, channel switching, image display etc.), infra red remote control receiving, the standby control, the control of auxiliary CPU, menu display, debugging...
  • Page 14 2, 3:SCL、SDA，for the control of IC operation; 27,28:output to the right and left channel of sound power amplifier; 33,34:right and left channel of earphone sound; 36,37:AV OUT right and left channel of sound; 47,48:right and left channel of sound fed from main board; 50,51:AV IN right and left channel of sound;...

  • Page 15: Sub Channel

    In which: Pin 71 is used for the input of C signal of SVHS; Pin 72 VIN1 is used for the input of Y signal of CVBS or SVHS of AV; Pin 73 VIN2 is used for the input of TV signal; Pin 75 VIN4 is used for the input of Y signal of YCRCB to synchronously identify YCRCB.
  • Page 16 processor of PW181 is lower than that of PW1230. Therefore when displaying dual picture the main picture effect is better than that of sub-picture. The adjustment of brightness, contrast, definition and chroma is performed by N302. The decoding of CCD/V-CHIP in this channel is specially performed by 21 line decoder N301 Z86229.
  • Page 17 SCALER is confirmed. 3.2. Block diagram of AD9887 is shown below Finally the video signals of different channels are sent respectively to V PORT and G PORT of main processing chip PW181 for processing. PW181 has such processing capabilities as “picture out of picture”, “picture in picture”, “multiple pictures”.
  • Page 18 PW181 is also the main CPU. Its program is stored in the externally connected flash N601. The software upgrading of RS-232 is actually the upgrading of the stored memory in N601 by PW181. The interface of menu is also produced by PW181. PW181 can automatically produce self check signal for trouble shooting.
  • Page 20 Distribution of the Circuit Board of Different Screens and their Functions 1、 42SD（Type:S42 SD-YD04，Code No:335-42001-00） Power supply board X driving Y driving Logic board Addressing circuit Parts Function designation Power supply Provide power for the operation of complete TV set board Convert the LVDS signal from the processing board into the one displayable by Logic board...
  • Page 21 2、 50HD（Type:S50HW-XD02，Code No.:335-50001-00） Addressing Y driving Power supply board X driving Logic board Parts Function designation Power supply Provide power for the operation of complete TV set board Convert the LVDS signal from the processing board into the one displayable by Logic board screen Addressing circuit for screen display, directly driving the address electrode on the...
  • Page 22 N601 AM29LV800BT-90E(353-29800-10) NM5 SDA555XFL (352-05550-20) video frequency 667-PH42D8-40 667-PH50D8-40 NM2 MSP3440G (353-34400-00) processor boards NM9 TDA7053AT (353-70530-70) TUNER1 JS-6B1/112A2-A2(590-40425-00) video frequency TUNER3 JS-6B1/111C6 (590-40422-00) 667-PS42D8-70 boards Sound NA01/NA02 TPA3001D (353-30010-10) amplification 667-PS42D8-24 boards Transformer board 667-PS42D8-46 Remote parts 301-UPS42D8-09 key-press board...
  • Page 23 Diagram of Normal Trouble Shooting 1． “Three no”, i.e., no raster, no picture and not sound: Three no If power indication lamp is lit Check power esp. check5V-STBY D3.3V abnormal normal Cutoff the connection between power board and Short circuit the pin 8 (PS-ON) of Check N501and signal process, X709 to the ground, then check...
  • Page 24 2． There is sound but no picture: With sound but no picture If there is interface for switch on If oscilloscope is Check if no image for all ready,first other channels measure the wave form of signal X60 N501 and Change into 4 peripheral check program...
  • Page 25 3． There is picture but not sound. There is picture but no sound If there is output from XA04of sound power amplification board Measure if there is signal in pin 2 of Sound box damaged sound power amplf.2 Sound power ampl. or other peripheral circuit have Measure if the sound input of the problem.
  • Page 26 No picture in sub channel: Check to see if pin 72 of N302 has signal input Measure Y and C signal output from R340~R345and There is problem from Av socket to line/field signal and see if they are normal N302 channel N501 PW181 or other peripheral circuit have problem N302 or other peripheral...
  • Page 27 TV no picture Take out dual picture and set the other picture to TV, to see if this picture is normal. normal no picture Input an AV signal to see if AV channel Input an AV signal to is normal see if the AV of dual picture is normal.
  • Page 28 4) VGA No Picture If input YPRPB signal is normall Measure the input line/field synch. If the mode of VGA (lower right corner signal of 81 and 82 of N403 of screen OSD) identifiable normal abnormal Check N403 and If the two TV pictures Input interface Check N402 its peripheral...
  • Page 29 It’s possible to check it by setting the screen to the state of self check as explained above Diagnosis for Plasma Screen of PS42D8 And Maintenance of the Functions of Various Modules on Screen As shown in the figure below, PDP screen can be divided into power supply board, X driving board, Y driving board, logic board, logic BUFFER board (E, F, G), Y BUFFER board ( upper and lower), COF etc.:...
  • Page 30 * Power supply board: to supply power for the screen, other functional modules on the screen, our own main board, and video frequency processing board. * X driving board: to produce and provide driving signal for X electrode according to the time sequence signal sent from logic board.
  • Page 31 SW2001 Switch the power on and see if the screen is lit. If the screen can give a normal and completely white field signal, then the problem lies in our main board or video frequency processing board, which will be dealt with separately. d.
  • Page 32 a. If it’s one vertical unlit line, then COF has problem. b. If it’s a vertical entirely unlit block, then first check if the connection socket between COF and logic BUFFER has problem. If not, check if the connection socket between the logic BUFFER and the logic board is normal.

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