Prima PH50D8, Service Manual

Page 1: ...PDP TV PS42D8 PH50D8 ...

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Page 3: ...aintenance operation at least one minute after the power is off 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 4 Never have operation or mounting work under unsuitable environment such as areas in the vicinity of wat...

Page 4: ...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 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...

Page 5: ...use too long or too big screw 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 It is used to isolate the cool part from the hot part Please take car...

Page 6: ...of defective points in A and B shall not exceed 8 The distance between two defective points shall not be shorter than 15mm 2 2 Model PH 50D8 There may appear three kinds of defective points for this model as shown in Fig 2 bright spot remain bright dark spot non illuminating flickering spot remain flickering However they should not exceed the specification as in table 2 Otherwise the product shall...

Page 7: ...adjustment and YpbPr white balance adjustment are for the purpose of white balance adjustment For the white balance adjustment of TV AV and VGA it s OK just directly adjust the first item whereas for YpbPr adjust the second item 4 For the white balance adjustment of TV AV and VGA select the item of white balance adjustment from the menu When it s entered as shown in the fig Below keep RCUI immovab...

Page 8: ...ed for troubleshooting Method of software upgrading The plasma TV models PS 42D8 and PH 50D8 launched by our company are equipped with RS 232 interface for upgrading that is carried in the steps below A Select a connection wire of serial port see the figure below which is required to have a notch on its both ends and also the pins 2 and 3 on the two ends are cross connected B Use the serial port c...

Page 9: ...ponding serial port if it s not possible to burnt write other serial port can be used instead Baud select 115200 and then select Reset Target After Download Hit flash press button and it s ready to operate For the setup of other items please refer to the figure above already defaulted by the system so it s normally unnecessary to alter A Switch on PDP and it begins to run the burnt write program ...

Page 10: ...el 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: ...it visible light Each plasma tube acts as an image element From the composition of these image elements in different brightness darkness and colors result the pictures and images of various grays and colors which is very similar to the light emission of display tube Plasma technology is obviously different form other display methods and is more advanced in structure and formation Its working princ...

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Page 13: ...h frequency distributor 5v Tuners are controlled by auxiliary MCU NM5 SDA SCL to select proper channel and carry out correct switching of systems After high amplification and medium amplification decoding video signal and audio signal are output The output signal of TUNER1 is fed into decoder N102 as the display of main picture whereas the output signal of TUNER3 is fed into decoder N302 as the di...

Page 14: ...opped After the removal of short circuit switch the set again and it restores to normal Therefore if the set becomes soundless due to the short circuit caused in carelessly pulling out or plugging in the audio frequency wire it is certainly not recommendable to do so just switch it on again and no big deal 3 Picture and image Y signal of AV and SVHS shares the same channel SVHS has priority Identi...

Page 15: ...clock VVS field synchronization VHS line synchronization VPEN enable signal are the basic reference for the image processing of lower level For TV set of mono N system this series has an additional 3D Y C separation function in the main channel which is performed by ND02 Upd64083 so as to enhance the quality of the image In this case the signal flow process of the main channel is different Video s...

Page 16: ...ing device is shown in the following figure AD9887 is also provided with DVI input port The DVI input signal is converted into 48 bit digital RGB signal and sent to G PORT of PW181 for processing The selection from DVI and VGA YPRPB is performed by AD9887 Certain organizations for the oversea sales of this TV series have been equipped with the capability to decode HDCP PORTA4 and PORTA5 of PW181 v...

Page 17: ...eet the requirement of the screen for format and finally output the signal in the form of 24 bit RGB The standard of interface for PDP screen is LVDS low voltage differential signal So the digital RGB signal output from PW181 still needs to be converted into LVDS signal by the conversion interface chip of LVDS N602 DS90C385 This chip may vary with the manufacturer of the screen This converted sign...

Page 18: ...hip Make sure that they are in normal working condition PW181 controls the standby of the complete TV set The POWER ON signal output from PORTB3 of PW181 is used to control the operation of the power supply board When it is POWER_ON the TV set is switched on with low electric level and is in standby with high electric level When it s in standby the remaining power supply is only 5VSTBY The voltage...

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Page 20: ...al from the processing board into the one displayable by screen Addressing circuit Addressing circuit for screen display directly driving the address electrode on the screen Vertical electrode totally 852X3electrode X driving X electrode horizontal common holding electrode driving circuit Y driving Y electrode horizontal scanning holding electrodes total 480 electrode driving circuit Logic board A...

Page 21: ...n Addressing circuit Addressing circuit for screen display directly driving the address electrode on the screen Vertical electrode totally 1366X3electrodes respectively driving for upper and lower half fields X driving X electrode horizontal common holding electrode driving circuit Y driving Y electrode horizontal scanning holding electrodes total 768 electrode driving circuit Y driving Power supp...

Page 22: ...7 PH42D8 40 667 PH50D8 40 NM5 SDA555XFL 352 05550 20 NM2 MSP3440G 353 34400 00 NM9 TDA7053AT 353 70530 70 video frequency boards 667 PS42D8 70 TUNER1 JS 6B1 112A2 A2 590 40425 00 TUNER3 JS 6B1 111C6 590 40422 00 Sound amplification boards 667 PS42D8 24 NA01 NA02 TPA3001D 353 30010 10 Transformer board 667 PS42D8 46 Remote parts 301 UPS42D8 09 key press board parts 667 PH42D8 05 667 PH50D8 05 power...

Page 23: ... is over current or over voltage this protection will function and no output Three no check5V STBY Cutoff the connection between power board and signal process check5V STB Cutoff the connection x2 between main board and video process Board then determine which board is abnormal Power board problem Check power esp D3 3V N501abno rmal Check supply crystal oscillation for N501andN601 Pull out X709 ch...

Page 24: ...ogic board For 50 HD screen S50HW XD02 Push down 1 and 4 and push up 2 3 5 6 of SW2001on the logic board Please make sure resume it to the original status when the check is over With sound but no picture If there is interface for switch on Check if no image for all other channels N501 and peripheral Change into 4 check program If oscilloscope is ready first measure the wave form of signal X60 Pull...

Page 25: ...uited or other problems that cause protection to work Measure if there is signal in pin 2 of sound power amplf 2 Measure if the sound input of the present channel corresponding to NM2 is normal MSP3440 or other peripheral circuit have problenm Check different levels of circuit following input audio signal channel Check if pin 72 of N102 has signal input Measure Y and C signal output from R143 R148...

Page 26: ... are normal There is problem from Av socket to N302 channel N501 PW181 or other peripheral circuit have problem N302 or other peripheral circuit have problem Check if YPRPB YCRCB1and YPRPB YCRCB2 both have no picture N1and interface circuit have problem Identify if YPRPB or YCRCB has problem Check N302 and peripheral If input VGA signal is normal Check N402 including switching voltage HDTV_SELandC...

Page 27: ...t circuit Check output signal of N102 line field synchronous clk PEN etc N204 and its peripheral circuits have problem Peripheral circuits of N501 V PORT have problem Input an AV signal to see if the AV of dual picture is normal If input VGAsignal is normal If voltage of N702 is normal Input circuit of N102 or interface has problem Check if output signals of N204 line field synch CLK PEN are norma...

Page 28: ...tor rows R419 R421 R425 R427 R431 R432 which may lead to loss of corresponding color from the gray degree corresponding to the picture of channels VGA YPRPB DVI Failure with resistor rows R415 R418 R422 R424 R429 R430 which may lead to loss of corresponding color from the gray degree corresponding to the picture of channel DVI Failure with resistor rows R342 R343 R344 R345 which may lead to loss o...

Page 29: ...mality is also related to the Y driving circuit that corresponds directly to its position To judge these phenomena It s possible to check it by setting the screen to the status of self check as explained above No brightness in the square block area Normally it s caused by the damage of the address BUFFER module that directly corresponds to its position or may be caused by the damage of the connect...

Page 30: ...board into the signals required by COF Y BUFFER board Upper Lower to transmit the scanning signal from the Y driving board to the screen which is divided into upper and lower parts COF to convert the signal sent from the logic BUFFER board into the address signal used by the screen II Trouble diagnosis 1 The screen is not bright a Check to see if the power supply plug from the power filter board t...

Page 31: ...re appears on the screen a line or several unlit lines Check if the socket between Y driving board and Y BUFFER is plugged well If not plug it well If yes then replace Y BUFFER upper lower in respect to the upper lower part of the dark line on the screen 3 There appear on the screen one or several horizontal lines that are much brighter than the remaining horizontal lines at the edge Check if the ...

Page 32: ...COF or the screen b If it s an entire vertical block of other colors then first check to see if the connection socket between COF and logice BUFFER has problem If no problem check if the connection socket between the logic BUFFER and the logic board is normal If it s normal then replace the logic BUFFER If the problem still remains after the replacement then replace the logic board Finally if the ...

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