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2-5

Convergence Adjustment Mode

The Convergence mode is used to perform raster ge-
ometry correction and convergence adjustments.

These adjustments must be made in both the SD
(NTSC 480i) and HD (1080i) modes.

Note:

Before activating the Convergence

mode, turn “Video Mute” Off. The internal
crosshatch pattern will not be displayed with
“Video Mute” On, only a blue background is
displayed.

Convergence Mode Activation

1. Press MENU-0-3-5-9
2. When the Convergence Mode is activated,

this display appears on a Green Crosshatch.
See

Figure 2-5

Activating the HD mode when no HD
signal is available

• Press the “DEVICE” button.
• Use the “UP-DOWN-RIGHT-LEFT”

direction buttons to select ANT-DTV,
then press “ENTER”.

• Press “MENU-0-3-9-5” in sequence to

activate the Coarse Green HD Conver-
gence mode.

Convergence Mode Functions

In the Convergence Mode there are three main Func-
tions (Categories).

• Pressing “6” activates CONV MISC
• Pressing “5” activates COARSE CONV
• Pressing “4” activates FINE CONV

CONV MISC (Press 6)
This mode is used to preset data values controlling
the Convergence Generator, and to perform the HV
Regulation adjustment.

1) Use the VIDEO button to select an item.
2) Use the ADJUST buttons to change data.

NOTE:

When Item “1 HVOL” is selected the

screen goes black except for the data display.
This occurs since a black screen is required
when making the HV Regulation adjustment.

COARSE CONV (Press 5)
There are four Sub Functions in the Coarse mode,
COARSE GREEN, COARSE RED, COARSE
BLUE and DF.

• COARSE GREEN .... used to make Coarse

Raster Geometry Adjustments.

• COARSE RED ... used to make Coarse Red

Convergence Adjustments.

• COARSE BLUE ... used to make Coarse

Blue Convergence Adjustments.

• DF ... used to preset data values controlling

the Dynamic Beam Focus circuit drive
signal.

Selecting the HD or SD Mode

Select the Signal Source

before entering the

Convergence Mode, either an NTSC or HD
source.

Enter the Convergence Mode

• If the signal source is NTSC, the SD mode
is activated.
• If the signal source is HD, the HD mode is

activated.

MODE

FUNCTION

SUB-FUNCTION

SD or HD

SD COARSE GREEN

0 HSTA

ITEM

ABREV

DATA

NO.

Figure 2-5: Convergence Mode

Содержание WS-48513

Страница 1: ...AL ELECTRONICS AMERICA INC T 2003 ECHNICAL RAINING Projection Television Technical Training Troubleshooting Manual WS 48613 WS 65713 WS 55813 WS 55613 WS 73713 WS 65813 WS 65613 V23 WS 48513 WS 55513 WS 65513 WS 73513 V23 V23 V23 V23 V23 ...

Страница 2: ......

Страница 4: ......

Страница 5: ...ment Procedures Initial Setup 2 1 Circuit Adjustment Mode 2 3 ConvergenceAdjustment Mode 2 5 Alignment Data Storage Locations 2 6 Chapter 3 Power Supply Low Energy Power Supply 3 1 Standard Standby Power Supply 3 4 Time Shift Recording Power Supply 3 2 Switched Supplies 3 7 Troubleshooting 3 8 Chapter 4 Control Circuitry Basic uPC Requirements 4 1 Reset Circuitry 4 2 Input Command Circuitry 4 3 Se...

Страница 6: ...ync Signal Path 6 2 Vertical Deflection 6 5 Horizontal Deflection 6 5 Deflection Loss Detection 6 7 High Voltage HV Regulation 6 8 X Ray Protect 6 9 Chapter 7 Convergence Circuitry Overall Block Diagram 7 1 Waveform Generator and D A Converter 7 2 LPF and Summing Amplifiers 7 3 Convergence Output Circuitry 7 4 Chapter 8 Sound Circuitry Overall Block Diagram 8 1 Signal Path 8 2 Chapter 9 Troublesho...

Страница 7: ...latinum Diamond Chassis V23 V23 V23 V23 48 W WS 48513 WS 48613 55 W WS 55513 WS 55613 WS 55813 65 W WS 65513 WS 65613 WS 65713 WS 65813 73 W WS 73513 WS 73713 Screen Size Table 1 V23 Models Improved Features 3rd Generation HDTV Receiver NetCommand 3 0 with IR Learning PerfectColor All Inputs and Signal Types AMVP Improved Performance 9 CRTs now available in a 65 Model Coaxial and 2 way speaker sys...

Страница 8: ...ield Focus Magnetic Focus Assembly on CRT Neck Results in smaller electron beam Two way Coaxial Speakers WS 55613 WS 65613 Improved Audio Tru Focus Lenses Improved and more uniform focus Two way Speaker System 6 Woofer 1 5 Tweeter for improved audio Gold Plated Jacks Gives high quality connections High Gloss Black Composite Back has Reduced Weight Fine Pitch Lenticular Screen Best Horizontal Resol...

Страница 9: ...Includes AV C but also allows a higher level of sofware communication for a more interactive interface When using IR an IR blaster must be connected to the TV and placed in front of the device to be con trolled The TV must then be configured so the proper IR codes will be used Like previous versions of NetCommand an IR Library is loaded in the TV s soft ware so that most common devices can be sele...

Страница 10: ...ns and their func tions is given in Table 3 Other remote functions are explained within the menus Full instructions are included in the Owner s Guide For Slideshow press PLAY For Thumbnails press GUIDE To redisplay this menu or to setup press DEVICE MENU For Playlist press AUDIO Figure 4 Memory Card Screen Figure 5 JPEG Thumbnails Figure 6 Audio Playlist Figure 7 Media Setup BUTTON FUNCTION VIDEO ...

Страница 11: ...radeoff between red and green PerfectColor was developed to provide precise control over the 6 in dividual primary and secondary colors Introduced in the V20 Chassis PerfectColor was initially limited to 480i composite video sources only For the V22 and V23 chassis PerfectColor can be setup individually for each and every Input and is compatible with all video source formats 480i 480p 1080i A colo...

Страница 12: ...nicians experienced with computer monitors may already be familiar with DVI and its features However because it is new to home the ater it will be covered here further Digital Visual Interface DVI DVI was originally designed by the Digital Display Working Group DDWG to provide a universally accepted digital connection between a PC and a dis play device At first glance another digital interface wou...

Страница 13: ...l Visual Interface Digital DVI I Digital Visual Interface Integrated Digital or Analog EDID Extended Display Identification Data HDCP High bandwidth Digital Content Protection TMDS Transistion Minimized Differential Signaling VESA Video Electronics Standards Association Acronyms Table 5 Transition Minimized Differential Signaling TMDS TMDS is a method used to transmit digital data that reduces the...

Страница 14: ... display device connected and can also be used to support copy protection Figure 10 Single Link TMDS Extended Display Identification Data EDID EDID is the VESA standard protocol used over the DDC so the display device can communicate identi fication about itself to the host device The data stored in memory in the display device can include its resolution sync timing and refresh rates etc It is par...

Страница 15: ... the TMDS encoder The encrypted data sent over the DVI interface is then immune to eavesdropping Only the autho rized display device can reverse the encryption af terwards Hot Plug Detect HPD Another part of the plug and play package is the VESA standard Hot Plug Detect A dedicated pin on the DVI connector is used by the display to let the host know it is plugged in When the host de vice detects a...

Страница 16: ...face NOTE V23 models are compliant with HDCP and EIA861 standards for standard extended and high definition 480i 480p 1080i video The DVI input is not intended for use with personal computers or devices outputing video signals with computer resolution DVI Input Block Diagram Figure 13 is a block diagram of the DVI input cir cuitry used on the V23 Chassis The circuitry will be similar in other mode...

Страница 17: ...11 Figure 13 V23 Chassis DVI Input Block Diagram ...

Страница 18: ...8 V16 1 2 7 0 1 2 5 7 1 2 5 9 6 5 4 Adjust Mode V17 8 2 7 0 8 2 5 7 8 2 5 9 6 5 4 Adjust Mode VZ9 V18 V19 0 1 7 0 0 1 5 7 0 1 5 9 6 5 4 Adj Mode 0 1 8 8 V20 VK20 2 2 7 0 2 2 5 7 2 2 5 9 6 5 4 Adjust Mode V21 2 1 7 0 2 1 5 7 2 1 5 9 6 5 4 2 1 8 8 K20 V22 V23 0 3 7 0 0 3 5 7 0 3 5 9 6 5 4 Adj Mode 0 3 8 8 Service Menu Access Codes ...

Страница 19: ...ce cabinet 65 73 models Customer Removable DiamondShield Composite Cabinet Back V23 Lightbox Like previous Mitsubishi projection TV chassis the V23 is based on a modular design that allows the lightbox to be removed for service Even without the front control panel card reader or front inputs it is still fully functional by use of the remote control This allows easier access to test points etc And ...

Страница 20: ...t Although not required for the reasons noted it is usually better to have the front panel connected when servicing the lightbox If this is not possible the following power up sequence should be used 1 Apply AC power 2 Press the remote Power button once 3 Wait 90 seconds 4 If no response press the Power button again 5 Wait 90 seconds Main Chassis Removal Refer to Figure 1 2 to remove the Main Chas...

Страница 21: ...1 3 Figure 1 2 Main Chassis Removal Figure 1 3 DM Replacement Step 1 Step 2 Step 3 TOP VIEW REAR VIEW TOP VIEW ...

Страница 22: ...1 4 Figure 1 4 PCB Locations Figure 1 5 Main Component Locations ...

Страница 23: ...crews shown in Figure 1 6 3 Remove the heat sink by gently prying the IC s loose When reinstalling please note Overtightening the screws can strip the plastic threads in the chassis Mounting clips should be firmly seated for proper heat transfer PCB DTV Tuner DM PCB MLINK PCB Terminal PCB Signal IR Learning NetCommand DVI Decoder A V Inputs Control uPC DM Interface IEEE1394 RS 232C Interface A V S...

Страница 24: ... comparable models The disassembly procedure for the cabinet front dif fers from conventional cabinets Note how the Cos metic Front Panel is removed Refer to Figure 1 7 Figure 1 7 V23 Cabinet Front Disassembly 1 Remove the Speaker Grille by pulling forward 2 Remove 2 screws a securing the Cosmetic Front Panel 3 Slide the Cosmetic Front Panel 1 inch to the right then lift away from the TV 4 Remove ...

Страница 25: ...al Initial Setup Option Menu Initial Setup Prior to alignment the procedures for initial setup should be followed so that all customer Main Menu andA V settings are set to the factory defaults listed in Table 2 1 and Table 2 2 Follow the steps below for the initial set up 1 Select the MENU display by pressing the MENU button once 2 Press the number buttons 0 3 7 0 in sequence to select the OPTION ...

Страница 26: ...uage English Lock Time NA Unlock Time NA Source Ant A Ch 3 Antenna ANT A Front Button Lock Off PIP Position Lower Right Memorize Channels Air POP Position Right Half Channel Ch 3 A V Memory Reset Ant A PIP POP Format 2 Window Memory Deleted Format Stretched TIME CAPTIONS ANTENNA Lock By Time MAIN MENU DEFAULT SETTINGS SETUP AUDIO VIDEO SETTINGS V CHIP LOCK Advanced PIP POP Table 2 1 Main Menu Fact...

Страница 27: ...nts are complete set the Remote to its original Operational Mode Hold the Power button and press 0 0 0 in sequence Activating the Circuit Adjustment Mode The current signal source determines if the activated Adjustment Mode is 480i or 1080i 1 Select the signal source 480i or 1080i 2 Press the MENU button on the remote control so the Main Menu is displayed 3 Press the number buttons 0 3 5 7 in sequ...

Страница 28: ...ave adjustment data in memory The character display turns red for approximately one second in this step Note If the circuit adjustment mode is ter minated without pressing ENTER changes in adjustment data are not saved CRT VC CRT JNGL DECODER 2 DECODER 1 DOUBLER Adjustment Functions Figure 2 4 Adjustment Functions Terminating the Circuit Adjustment Mode Press the MENU button on the remote hand uni...

Страница 29: ...s FINE CONV CONV MISC Press 6 This mode is used to preset data values controlling the Convergence Generator and to perform the HV Regulation adjustment 1 Use the VIDEO button to select an item 2 Use the ADJUST buttons to change data NOTE When Item 1 HVOL is selected the screen goes black except for the data display This occurs since a black screen is required when making the HV Regulation adjustme...

Страница 30: ... Cursor the ADJUST buttons adjust the active color at the current Cursor position horizontally or vertically The on screen display changes in the Fine mode as shown in Figure 2 7 The display shows the verti cal and horizontal data for the current Cursor Posi tion and the horizontal and vertical coordinates for that position Saving Data and Exiting the Convergence Mode Press MENU twice to exit the ...

Страница 31: ...uppliesfurnishpowerforthePTVControlCir cuitry This is the only circuitry active in the Low En ergy Mode when the PTV is Off IntheLowEnergyModethesetisbootedupeachtime the TV is switched On When switched On the LED will flash for approximately one minute before the TV powers On Low Energy ModeActivation TheLowEnergyModeisactivatedfromtheuser sOn screen Menus To activate the Low Energy Mode 1 Press ...

Страница 32: ...supply 2 Through R9A18 to the Standard Standby Regulatorcircuit servingasastart upvoltage source For regulation a sample of the 9VS supply is fed back to pin 4 of IC9A10 via D9A14 and PC9A20 Regulation IC9A10 does not regulate by controlling the PWM of the oscillator signal Under normal load some of the 132 kHz cycles are removed and not applied to the FET Underlightloads moreofthecyclesareremoved...

Страница 33: ...lier the Low Energy 9VS is the source for the 5VS 3 3V ES and 3 3VS 1 The 5VS and 3 3VS 1 supplies power to the IC7A00 the PTV ControlµPC The 3 3V ES supplies power to the PTV Control cir cuit E2PROM now located on the PCB TERMINAL The 9VS supply also provides power for theAntenna RelayintheRFSwitch ...

Страница 34: ... PC9A20 The Photo Coupler turns Q9A12 On supplying start up voltage to pin 4 of IC9A20 Whenoscillationstarts thesignalfrompin2of T9A20 is rectified by D9A22 and added to the start upvoltagetomaintainoscillation Regulation The secondary 12VS supply is monitored for regula tion Asample of the 12VS is compared to a reference in IC9A21 Acorrection voltage from IC9A21 con trols a second Optical Coupler...

Страница 35: ...rcuitry is the source for 30VS and 28 DM supplies The 12VS is also directed to Horizontal Drive Circuitry and is the Start upvoltagesourcefortheSwitchedSupplyRegu lator In addition to being the 6V DM source the 6VS sup plysuppliespowerforCRTProtect circuitry andisthe source for the 3 3V 1 and 5V 2 supplies Time Shift Recording Power Supplies TheTimeShiftRecordSuppliesareswitchedsupplies derived fr...

Страница 36: ...e 12VS supply The 12V supply enables IC9A22 and the 5V 1 supply is gener ated Time Shift Supply Power Distribution Figure3 8illustratesthePowerDistributionfortheTime Shift supplies The 5V 1 supply is used by the MLink 3DYC and Signal Select circuitry It is also the source for the 3 3V 2supply which is directed to the Conver ...

Страница 37: ...es Regulator When the TV is switched On both the PON 1 and PON 2linesgoHigh WhenPON 2goesHighQ9A51 conducts 1 ClosingrelayK9A50 shortingoutcurrent limiting resistor R9A02 refer to Figure3 2 2 Activating a Photo Coupler in PC9A50 The Photo Coupler turns Q9A56 On and start up volt age from the Standby Regulator is applied to pin 4 of IC9A50 Signal from pin 3 of T9A50 is rectified by D9A44 and addedt...

Страница 38: ... 24V supply is used in the Convergence circuitry and is the source for the 20V supply used in the CRT Drive circuitry The 210V supply is also used in the CRTDrivecircuits Troubleshooting ThemostcommonsymptomduetoPowerSupplyprob lemsis TheTVWillNotTurnOn TheFlowChartin Figure3 11 maybeofsomehelpinisolatingthecause of a Won tTurnOnProblem If the LED flashes For 1 minute before the TV turns On This i...

Страница 39: ...is seated properly Check that there is Standby 9VS Fig 3 2 Check that the SUB POWER command line does not go High Fig 3 5 Chirping sound check the Standby Regulator IC9A20 Fig 3 5 IfitTurnsOnthenOff Check the 24V fuses Check Horizontal Deflection Circuitry ...

Страница 40: ...3 10 ...

Страница 41: ...l commands from two sources 1 User commands from the front panel or remote control 2 Commands from the DM µPC Even though circuitry is becoming more complex the same basic requirements must be met for a µPC to op erate Basic µPC Requirements Figure 4 1 illustrates the four basic requirements for the TV µPC operation in the V23 1 DC Supply 3 3V ES and 5VS 2 Ground Returns pins 8 9 and 14 3 TimingSi...

Страница 42: ...mal and Reset logic are shown in the diagram IC7C70 is the Reset IC ALow from pin 1 resets the TV µPC IC7C70 is a Watch Dog type of Reset IC that monitors the µPC s operation It has an internal counterthatiscontinuallyresetbypulsesfromtheµPC input at pin 4 of the IC If the µPC locks up no pulses aregenerated Thecounterreachesitsmaximumcount and a reset pulse is output at pin 1 to reset the µPC ...

Страница 43: ...et through IC7C30 IC7A00 also outputs reset pulses for the Convergence Generator AudioControl 3DYCandMLinkcircuitry Input Command Circuitry Figure 4 3 illustrates the Command Input circuit It is basically the same as that in the V19 and V21 so an in depth description is only necessary on those parts that aredifferent The front panel Buttons are in a conventional resistive ladder configuration Pres...

Страница 44: ...e data IfitisaMitsubishicommandtheSYS 5µPC directsit totheDMModule Thesignalisprocessedandrouted back to the TV µPC over the DM RXD line If the commands are for a System 5 component they are di rected to the SYS 5 IR Blaster Outputs OthermanufacturersIRsignalsareamplifiedbytheWide BandPreamp directedthroughIC7C50totheRepeater IR Blaster Outputs If IR signals are being output at that time the IR OU...

Страница 45: ...eDMModule The DM Module also controls the MLink DVI circuitry throughtheDVI RXDandDVI TXDlines Figure 4 4 also shows that the DM Module receives and processes the signals from the Card Reader µPC Parallel Inputs The parallel inputs to the µPC are status inputs or sig nals inputs required for control purposes AC OFFInput Informs the µPC ifAC Power is lost The monitoring circuitisshowninFigure4 5 Sa...

Страница 46: ...ors ExcessiveHV Excess CRTBeamCurrent ExcessHVcircuitCurrent If any of the preceeding occurs the X Ray line goes Low and the TV shuts Off ThemonitoringcircuitsforX rayProtectaredescribed in the detail in the Deflection and HV Section Other parallel inputs to the µPC are listed in Table4 1 IC7A00 Additional Inputs Pin Name Source 6 SD SUB Sub Tuner Sync Detector 7 SD MAIN Main Tuner Sync Detector 6...

Страница 47: ...directs the signal to the VCJ and IC2V03 directs the signaltotheDoublercircuit ThepathoftheDM BLK signal is determined by BLK EN from the TV µPC BLK ENisapplieddirectlyto theOE OutputEnable input of IC2V03 and is inverted by Q2X04 and ap pliedtotheOEinputofIC2V02 IC2V02andIC2V03 are enabled when their OE input GOES Low When EN BLK is High IC2V02 is enabled and the DM BLK is directed to the VCJ Whe...

Страница 48: ...n the source is Digital momentarily dis ablingthePerfectColorduringtheOSD Flash Circuit Figure 4 9 shows the Flash Circuit in the V23 This circuitisnotcontrolledbytheµPCs butcanbeconsid ered a status sensor It prevents a momentary flash on thescreen When the TV is switched Off PON 1 goes Low IfAC power is lost AC OFF goes High If the 24V supply is lost Q7C11 conducts If any of the above occurs dri...

Страница 49: ...ncluding the DTV Tuner are processed by the Doubler circuitry In the V21 480pandDMsignalsonlywereprocessedbythe Doubler circuitry when a display other than Standard format was selected or when PIP POP was activated ThenewimprovedColorManagement ColorPerfectTM circuitryisintheDoublercircuitryanditnowprocesses allsignalsources Thereforeallsignalsmustpassthrough theDoubler Twoadditionalsignalsourcesa...

Страница 50: ...ctionsinclude Converting NTSC to YPbPr Sync Separation Detecting signal format 480i 480p etc ConvertingRGBtoYPbPr The Component Switch ICs are also new generic MM1519XQ There are two Component Switch ICs on PCB TERMINAL and a third one on PCB SIG NAL not shown in Figure 5 1 IC2A00selectstheMainandSubpicturesourcesfrom Main Decoder output ExternalComp 1Input ExternalComp 2input IC2B00selectstheMain...

Страница 51: ... to COMP SW 3 IC2H01 IC2H01 selects the mainsignalfromthePCB TERMINALmainoutputs or the MLINK signal from the MLINK Decoder or the RGB signal from the DM Module The output of IC2H01 is applied to the Main Picture inputs to the Doublercircuit Note that the OSD RGB signals from the DM Module are also directed the VCJ IC2V01 On Screen Display OSD signals are generated in the DMModule andwhenthesignal...

Страница 52: ...is also the same as the V21 but a review may be in order When Q2W03 conducts it turn On Q2W05 Q2W08 and Q2W11 The conduction of the three transistors removes RGB drive to the CRTS The conduction of Q2W03 is controlled from two sources 1 The BLANK CRT command from the µPC momentarilyblankingtheCRTsduringchannel orinputselectionchanges 2 The VBLNK line The logic on the VBLNK lineiscontrolledbyDeflec...

Страница 53: ... I F amp ICs SF5200 IC5252 SF5201 and IC5253 in that order The and I F signals from IC5253 are directed to pin 69 and 68 of the Demodulator IC52A0 The out put of the Demodulator is the Transport data stream used to modulate the carrier at the station The Transport Data Stream TODATA is directed to the Digital Module The signal is processed by the cir cuitryintheDM andresultsinanalogRGBsignalsout p...

Страница 54: ... signals from the 3DYC Comb Filter are directed back to IC2L00 IC2L00 directs the sig nals to the monitor Inputs of IC2K00 IC2K00 selects the signal from IC2L00 or the DM signal input at pins 24 and 26 of IC2K00 IfthesignalsourceisfromaComponentInput theDTV Input VGA Input or MLINK Input no signal is avail able at the Monitor Outputs ...

Страница 55: ... as 5 wire Sync on green is no longer an option Obviously all 5 wire inputs have sepa rate horizontal and vertical sync Sync Select circuitry selects the Main picture sync source The selected output is used to synchronize the Horizontal and Vertical Deflection Generators If the source signal is 480i horizontal sync is doubled before synchronizing the Horizontal Drive Generator Horizontal deflectio...

Страница 56: ...80i scan ning format Component signals can be 480i 480p or 1080i IC2F00 the Main NTSC Decoder extracts horizon tal and vertical sync when the source signal is com posite or component video IC2A95 selects the already seperate vertical and hori zontal sync from the 5 wire sources DTV when the source is 5 wire VGA DVI decoded from the digital signal DM also decoded from a digital signal The selected ...

Страница 57: ...PCB Terminal Selected Main and Sub sync signals from the Terminal to the Doubler PCBs Sync from the doubler to the VCJ The selected sync is directed to the Doubler circuitry If the selected source is 480i the number of hori zontal lines are doubled When the selected source is 480p or 1080i no line doubling is required How ever since all sync signals 480i 480p and 1080i pass through the PCB DOUBLER...

Страница 58: ...cted to the VCJ IC2V01 Both Horizontal and Vertical Drive Generators are in the VCJ Horizontal drive is out put at pin 40 and vertical drive is output at pins 52 and 53 The signals are directed to their respective output circuitry on the PCB MAIN ...

Страница 59: ... the Deflection Yokes ground return at pin 4 of DY to pin 1 of IC4B01 provide linearity and S correction Horizontal Deflection Figure 6 4 illustrates the Horizontal Deflection Drive and Output circuitry Horizontal drive signal from the VCJ is amplified by Horizontal Drive circuitry including transistors Q2V40 Q5A40 Q5A33 Q5A39 and Q5A32 The output from Q5A32 is directed to Q5A31 the Horizontal Out...

Страница 60: ...e the Deflection DC supply during scanning frequency changes Figure 6 6 shows the Horizontal Deflection DC Sup ply circuitry The conduction of Q5A01 determines the value of the DC Supply for the Horizontal Out put Transistor Q5A31 The conduction of Q5A01 is controlled by Q5A06 Q5A05 Q5A03 and Q5A02 EWDRV signal is ap plied to the base of Q5A06 for Side Pincushion Cor rection When the base voltage ...

Страница 61: ...e DC supply for Q5A32 Deflection Loss Detection To prevent damage to the CRTs the TV must shut Off if deflection is lost The Deflection Loss Detec tion circuit is similar to previous models as shown in Figure 6 7 Q4B01 monitors vertical deflection and Q5A38 monitors horizontal deflection The conduction of both transistors holds their respective collector volt age below the forward bias point of th...

Страница 62: ...erate the HV and Focus voltages for the three CRTs The amount of HV generated depends of the con duction time of Q5A51 the longer the conduction time the more energy supplied to the Flyback and HV increases HV is regulated by controlling the duty cycle of the drive signal to Q5A31 A sample of the HV HV DC FB is derived from an internal resistive divider in the Flyback and is out put at pin 13 The ...

Страница 63: ... D5A57 3 Excessive CRT Beam current by monitoring the voltage at pin 8 for T5A51 Each of the monitored sources is applied to an input of an OP Amp in IC5A02 The second input of each OP Amp is connected to a specific reference The outputs of all three Op Amps are tied together at the X Ray line The X Ray line is normally High If any of the moni tored sources exceeds its specific reference the X Ray...

Страница 64: ... CRTArcs this circuitry immedi ately removes HV Drive If X Ray Protect shuts the TV Off pressing the Power button will turn the TV back On it may shut Off again if the problem still exists If Arc Protect is activated the TV must be switched Off before it can be switched back On ...

Страница 65: ... frequency digital signals are removed and the analog correction signals are amplified Green cor rection signals are added to the red and blue signals in theAmplifiers hence the name SummingAmpli fiers The correction signals are amplified by OutputAm plifiers and are directed to the sub coils in their re spective Deflection Yokes This is the same basic circuitry used in the last few chassis types ...

Страница 66: ...ne C MUTE disables the Convergence circuitry when the set is first powered on off and when exiting the convergence mode when data is stored in memory C BUSY Allows IC8D00 to notify the µPC if it is busy C ACK Acknowledgment line allows notification to the µPC that a command was received C RST Convergence Reset IC8D00 also generates the signals for the internal crosshatch pattern These are the C OS...

Страница 67: ...1 and IC8E02 Each correction signal from IC8D00 goes through two stages of amplification 1 The first stage is part of the LPF 2 The second stage is the Summing Amplifier Green horizontal and vertical correction signals are added to the Red and Blue Summing Amplifier in puts Figure 7 3 Low Pass Filter and Summing Amplifiers ...

Страница 68: ...Convergence Output circuitry located on the PCB Power The correction signals Figure 7 4 Convergence Output Circuitry are amplified and directed to the Sub Vertical and Sub Horizontal coils located within their respective red green and blue Deflection Yokes ...

Страница 69: ...format from the ATSC QAM Tuner or the IEEE 1394 inputs The remainder of the circuitry is conventional MCS Decoder circuitry decodes the Main Tuner sound signal generating mono stereo or SAP signals when broadcast Main picture sound from the Select circuitry takes two paths 1 To Audio Control circuitry 2 To the Monitor Outputs The Audio Control circuitry performs adjust ments to the Volume Treble B...

Страница 70: ...8 2 Figure 8 2 Overall Sound Circuitry Block Diagram ...

Страница 71: ...und Output Jacks The selected main Sound signal is directed to Audio Control circuitry also in IC3A01 The sound signal from IC3A01 is amplified in IC3E01 and directed to the speakers The input signals to IC3A01 are also directed to the Monitor Output Jacks Only fixed level sound is available at the Monitor Output Jacks Digital Audio Output There is one additional audio output signal in the V23 cha...

Страница 72: ...8 4 ...

Страница 73: ... TheLEDwillflashtheErrorCodeindicating what caused the TV to shut Off 4 The Error Code will be repeated 5 times 5 When the LED stops flashing the mode is automatically terminated Reading the Error Codes The Error Codes are two digit numbers The LED Flashesthevalueofthemostsignificantdigit MSD Then there is a pause Flashes the value of the least significant digit LSD The Error Code is repeated 5 ti...

Страница 74: ... Theater System cannot be con trolled properly with NetCommand the Remote Con trolmaynotbeintheNetCommandOperationalMode To put the Remote in the NetCommand Mode 1 Set the Remote to the TV Layer 2 Point the Remote away from the TV 3 Press and Hold the POWER button and enter 9 3 5 in sequence CRT Phosphor Protection Troubleshooting problems in the CRT Protect De flection Loss Detection and the Defl...

Страница 75: ......

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