Download
Share
Print this page
  1. Manuals
  2. Brands
  3. XOCECO Manuals
  4. TV
  5. PS42K8
  6. Service manual

XOCECO PS42K8 Service Manual

Hide thumbs

Advertisement

Quick Links

Download this manual
COLOR TELEVISION
PS42K8

Advertisement

loading

Related Manuals for XOCECO PS42K8

Summary of Contents for XOCECO PS42K8

  • Page 1 COLOR TELEVISION PS42K8...

  • Page 2: 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. 1.Safety Instructions Please read the “Points for attention for the Maintenance & Repair of PDP”and “Criterion for Identifying the Defects on Screen”...
  • Page 3 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. 10).There are quite a number of circuits in PDP that are integrated ones.
  • Page 4 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. 21). There is piece of insulator stuck on the rear chassis corresponding to the power supply board.
  • Page 5 2.Method of Debugging 1. Adjustment for MS42K8 excludes 3.1and 3.2 2.Adjustment and calibration Equipment PM5518(Video signal generator), K-7253(VGA signal generator),CA100 (White Balancer) 3.Flow process of Adjustment and calibration For flow process of Adjustment and calibration, see Figure 1 Check if DDC has been FLASH written. Production of CPU board and AV or TV board on the line.
  • Page 6 4.AV/TV Board adjustment Adjust the potential meter VR12 on the power supply board, measure the test point TP1(12VAMP) on the AV/TV board and set the reading at 15±0.05 V. 5. CPU board adjustment Connect CPU board, push button board and AV or TV board, put power on, and observe if the display is normal.
  • Page 7 VCD adjustment is over. Set the value of option to 9, s-bright to 150, s-contrast to 130,max-volume :PS42K8 and 14/MS42K8 to 66. Enter the adjustment page of VPC3230, adjust the data of the page to be 0,1,3,3,0,1,9 from top to bottom.
  • Page 8 100 mm. (The thickness of our PS-42K8 is 79mm only, which is the thinnest in the market) 1. For the working principle and process flow of PS42K8, see block diagram of complete TV set. The signal flow process is described briefly as follows: By way of TUNA01, the RF signal of satellite TV, BS-RF produces color full TV signal TV-BS and audio frequency signal BS-R/L.
  • Page 9 and then it is also sent to U13 in YUV format of 24bit. 24bit RGB signal is output and sent to main processing IC JAG-ASM(U12) after the above two routes of signal are processed in matrix , color density, and tint in U13.. Another route of RGB signal of computer VGA is also sent to U12, where two routes of signal are subject to selection and processing for picture format.

  • Page 10: Block Diagram

    2.BLOCK DIAGRAM BIT/DET TV-BS BS-RF TUNA01 TV-IN2 LVDS TUNA02 SCALER 24bit DRIVER NA07 PI5V330 JAG-ASM 24bit DS90C385MTD DEINTER LACER ITU-R656 FLI2310 8bit KEY BOARD YCbCr SDRAM SDRAM SDRAM AV-V OUT I C BUS FLASHMEMORY MICRO-CONTRLER EEPROM 24bit TSC80251G2D MST9883 YCbCr NA04 NA08 AUDIO...
  • Page 11 4.IC BLOCK 1． MSP3420...
  • Page 12 2．VPC3230...
  • Page 13 3． JAG-ASM...
  • Page 15 5.Distribution of the Circuit Board of Different Screens and their Functions 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 screen...
  • Page 16 (353-23100-00) VPC3230D (353-32300-80) CPU board 667-MS42K8-56 MST9883B (353-98830-10) DS90C385MTD (353-03850-20) TSC80251G2D (353-80251-10)U4 AT49F002NT (352-49002-70) NA04 MSP3420G-Q (353-34200-10) video frequency NA08 M62494FP (353-62494-20) 667-PS42K8-40 processor boards NA10 NA11 TPA3001 (353-30010-10) Remote parts 301-UPS42D8-09 key-press board 667-PS42K8-05 parts Power filter board 667-PS42D8-51...
  • Page 17 9.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 check5V-STBY esp. D3.3V normal Cutoff the connection between power board Check N501and Short circuit the pin 8 (PS-ON) and signal process, N601 of X709 to the ground, then...
  • Page 18 2． There is sound but no picture: With sound but no picture If there is interface for switch on Check if no image for all other oscilloscope channels ready， first measure the wave form of signal X60 N501 and Change into 4 peripheral check program...
  • Page 19 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 Sound box damaged of sound power amplf.2 Sound power ampl. or other peripheral circuit have problem. Check Measure if the sound input of the power supply,if SHUTDOWN pin control is normal and if output present channel corresponding to...
  • Page 20 2) D4 no picture Check U30 pin48(Y) and pin49 (SOG) Check D4 to U30 Check RP36~RP41,RP141 and U30 Check U30 Check RP3~RP9 and U13 FLI2310 否 Check U13 FLI2310 Check U12...
  • Page 21 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 Input an AV signal to see if channel is normal the AV of dual picture is normal.
  • Page 22 3) VGA No Picture If input YPRPB signal is normal 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 Input interface circuit has Check N402 If the two TV pictures are Check N403...
  • Page 23 Bad connection between N203 and N204, which may also lead to abnormal picture (column bar like) in main channel TV/AV. Abnormal picture vertically or horizontally (bar like): Abnormal in complete line extending all the way from up downward on the screen of stand definition TV setr; abnormal vertically on half screen of high definition TV set.
  • Page 24 * X driving board: to produce and provide driving signal for X electrode according to the time sequence signal sent from logic board. * Y driving board: to produce and provide driving signal for Y electrode according to the time sequence signal sent from logic board.
  • Page 25 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 26 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.