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8-7

• Q5A07 conducts
• VBLNK goes High, activating CRT Protect

Flash Protect Circuit

The Flash Protect circuit in

Figure 8-7

is new. It

prevents the screen from flashing by removing HV:

• If AC Power is lost.
• When switching Power from On to Off
• If the 24V supply is lost.

IC5H00 is a one shot multivibrator and monitors the
AC-OFF line. When power is lost:

• The AC-OFF line momentarily goes High.
• IC5H00 is triggered an outputs a positive

pulse.

• Q4A02 conducts pulling pin 25 of the Jungle

IC Low.

• HV is removed.

This same action occurs when Power is switched from
On to Off.

• The P-ON1 line goes Low.
• Q5F01 stops conduction.
• Q5F01 collector voltage rises.
• Q4A02 conducts removing HV.

Loss of the 24V supply has the same effect.

• Q5F02 momentarily conducts due to the

charge on C5F02.

• Q4A02 conducts.
• HV is removed.

Содержание V19-V21

Страница 1: ...Television Technical Training Manual V19 V21 V19 V21 V19 CHASSIS WS 55859 WS 48511 WS 65511 WS 55909 WS B55 WS 65611 WS 65909 WS 55511 WS 65711 WS 65869 WS 55711 WS 65712 WS 73909 WS 73711 V21 CHASSI...

Страница 2: ......

Страница 3: ...on Codes 4 1 Adjustment Mode 4 2 Function Nomenclature 4 2 OSD Position Mode 4 2 Convergence Mode 4 2 HD Convergence With No Signal 4 3 Chapter 5 Power Supply Overall Block Diagram 5 1 Standby Supplie...

Страница 4: ...pter 8 Deflection and High Voltage Sync Block Diagram 8 1 Sync Signal Path 8 2 Deflection and High Voltage 8 3 HV 12 Volt Supply 8 4 HV Regulation 8 5 X Ray Protect 8 5 Deflection Loss Detection 8 6 F...

Страница 5: ...ive Picture Format modes Picture Format Memory by Input IR Repeater Outputs PIP POP features V19 PIP POP and Multi PIP features V21 Composite and S Video Monitor Outputs Sub Picture Sound Outputs Anal...

Страница 6: ...i callyperformed TheinitialNetCommandTM setuppro cedure is described in Chapter 2 NetCommandTM controls Home Theater components bytwomethods 1 Legacy Devices System 5 compatible are controlled through...

Страница 7: ...394compliant There are two types of 1394 Cables 6 wire two wires for data transfer two wires for timing and two wires for power 4 wire two for data transfer and two for timing Figure 1 2 shows an IEEE...

Страница 8: ...tsubishi s HS HD2000U and HS HD1100U D VCRsincludesHDTVrecordingcapabilityandHAVi However it must be connected to an externalATVRe ceiver with a IEEE 1394 interface such as in the V19 chassis Time Shi...

Страница 9: ...put from the Repeater Jacks DigitalAnalog Inputs Outputs are located on the rear of the TV and are shown in Figure 1 4 These include ANT DTV Antenna or Cable Input ATSC or QAM Three 1394 Jacks to conn...

Страница 10: ...ures POP PIPfeatures are illustrated in Figure 1 6 They are similar to those in previous models In addition to PIP POP V21 has multi PIP capabilitys Only 480i format signals can be selected for POP PI...

Страница 11: ...controlled in the normal fashion To use NetCommandTM the Remote Hand Unit must be changed to the NetCommandTM mode Changing the Remote operational mode is described in Chapter 2 LED Diagnostics The L...

Страница 12: ...1 8...

Страница 13: ...dTM isautomaticallyactivated Forspecfic instructionsonsetupanduse refertotheOwner sGuide andNetCommandGuide Set the Remote to the TV Layer NetCommand POWER 9 3 5 Standard POWER 0 0 0 Press and Hold Pr...

Страница 14: ...2 2...

Страница 15: ...urse all front panel PCBs and the speakers must be dis connected before the Light Box can be removed Figure 3 1 shows one major change to the Light Box assembly the addition of the Digital Module DM o...

Страница 16: ...ssis If this occurs 1 Remove the three DM mounting screws b in Figure 3 2 2 Slide the DM Module out the rear of the unit 3 Then slide the chassis out the rear of the unit NOTE The DM Module must be co...

Страница 17: ...3 3...

Страница 18: ...3 4 DM POWER SUPPLY ATV TUNER DE MODULATOR E2P MODULE FLASH CARD SLOT COVER Figure 3 5 DM Module Main Components...

Страница 19: ...was set in the HR Function of the Adjustment Mode The V19 V21 uses a separate mode withits ownactivationcodetopositiontheOSD Activation Codes For a quick reference Table 4 1 lists the codes for the V2...

Страница 20: ...ing OSD Position is given Figure 4 2 Convergence Mode Like the Adjustment Mode the only change in the Convergence Mode procedure is the activation code Figure 4 3 graphically shows the general Con ver...

Страница 21: ...complete change back to the Standard Mode Hold Power and press 0 0 0 in sequence Note To produce the internal crosshatch with a black background 1 Turn off Video Mute 2 Select a source with no signal...

Страница 22: ...4 4 Adjustments RefertotheServiceManualforspecificadjustmentpro cedures...

Страница 23: ...de Regulators are the source for both types of supplies An additional Standby source is used to supplypowertotheDMModuleintheV19 V21chas sis TheDMPowerSupplyisinternaltotheDMMod ule It receives power...

Страница 24: ...fied by D9A22 and adds to the voltage at pin 4 of IC9A20 If the voltage drops below 11 volts the oscillator shuts Off 4 Feedback for regulation is from the STBY 12V supply through IC9A21 and PC9A20 to...

Страница 25: ...hat voltage sources rectified by D9A01 and D9A27 are both directed to the Switch Mode Regulator for the Switched Supplies Switched Supplies Regulator Figure 5 3showstheSwitchedSuppliesSwitchMode Regul...

Страница 26: ...ing resistor R9A02 refer to Figure 1 The LED and Photo Transistor in PC9A50 conduct Q9A50conductssupplyingrectifiedvoltage from D9A27 in the Standby Regulator to pin 4 of IC9A50 Additional voltage is...

Страница 27: ...oltages are routed to the digital circuitry in the mod ule TheSTBY12ValsoprovidespowerfortheRegu latorcircuitryintheDMPowerSupply The DM Regulation circuitry generates two supplies DM 5V and DM 3 3V T...

Страница 28: ...mps the Drain outputs to 3 3 volts The clamping at 3 3 volts and the stepped up signal from T9B00 are filtered to form the DM 5V supply All current rated in mA Name 3 3V1 3 3V2 3 3V3 3 3VS1 5V1 5V2 5V...

Страница 29: ...rocess AV Switch Conv Gen Conv Out 700 700 CRT video 150 50 DBF 1 4 Digital Module 310 CRT 630 HV 17 400 H Defl 6 500 Jungle TV PC V Chip Sub Misc main 70 Preamp Protect 1 AMDP Sub Decoder SVM 6 30 Sw...

Страница 30: ...9V T9A50 24V D8D04 zener 9V Zener diode on Power board to PCB CONV GEN 9V1 T9A50 24V D8D03 zener 9V Zener diode on Power board to PCB CONV GEN 9V2 T9A20 12VS Q9A20 12V IC9C01 9V Linear regulator 9V 1...

Страница 31: ...the required commands and directs them through the TV PC to the appropriate circuitry There are three sets of E2PROM memory ICs one for each PCandonefortheConvergenceWaveformGen erator User programmed...

Страница 32: ...that s columns input changes denoting the command The TV PC con vertsthecommandtoaserialdataformatandforwards it to the DM PC over the DM TXD line The DM PC generates the appropriate control sig nals...

Страница 33: ...om the TV PC s E2PROM IC7A01 SDA MN Controls the Sub Decoder YCbCr Signal Selection Sub V Chip VCJ and 2HDW circuitry C SDA Controls the Convergence circuitry SDA 3D Controls the 3DYC and Main Decoder...

Страница 34: ...no communication between the TV PC and the DM PC the TV will not switch On DC Supplies Figure 6 3 shows the DC supplies for theTV PC cir cuitry The TV PC requires a 5 volt DC supply The STBY 12V suppl...

Страница 35: ...ts in the DM PC circuit If communication is lost from either the TV PC or from the DM PC the other PC automatically generates a Reset pulse A Low at pin 11 of IC7A00 resets the DM PC and a Low from pi...

Страница 36: ...not changed the method of monitoring the AC source is different in the V19 Figure 6 6 illustrates the AC OFF monitoring circuit in the V19 The AC signal applied to Bridge Rectifier D9A01 is monitored...

Страница 37: ...command signal processing circuits POWER GOOD 82 High AC Power Loss S FRUN 84 Sub Picture Freerun SUB CONTRAST 25 Reduces video amplitude during Sub Contrast Adjust SUB SYNC SW 23 Sub Picture Sync Sw...

Страница 38: ...the Transport Data Stream and outputs analog RGB signals All On Screen Display OSD signals except Conver gence OSD are generated in the DM OSD circuit When the main picture source is digital from the...

Страница 39: ...the Flash Card slot remove the Flash Card Cover by removing the mounting screws This ex poses the slot for the Flash Card and a Blue button During the update the Blue button must be de pressed After i...

Страница 40: ...from both DM Modules Insert the old E2P Module into the new replacement DM Module Refer to Figure 6 10 for the general location of the E2P Module Figure 6 11 shows a close up of the E2P Module plugged...

Страница 41: ...6 11 Figure 6 11 E2P Module Plugged In Figure 6 12 E2P Module Unplugged E2P MODULE...

Страница 42: ...6 12...

Страница 43: ...Cr signals and converts them to the RGB format to drive the CRTs Only 480i signals are valid sources for PIP POP signal processing in the 2HDW circuitry Therefore the PIP POPfeaturesareonlypossiblewhe...

Страница 44: ...External 5 inputs are thefrontpanelinputs IC2K00 selects main and sub picture signals from IC2L00 or from the External 2 input Main Tuner or Sub Tuner The selected main picture signals are di rected...

Страница 45: ...n Decoder or the Component DTV or the VGA inputs The selected signals can be 480i YCbCr are directed to PCB 2HDW and CbCr to the DM Module The 480i Y signal directly from PCB 3DYC is routed to the DM...

Страница 46: ...Path Sub picture NTSC signals from the A V Switch cir cuitry are converted to YCbCr signals by the Sub Decoder The output from the Sub Decoder is applied to the Sub YCbCr Select circuit Signals from...

Страница 47: ...circuitry has been simplified The DVD Select IC IC2A60 selects either COMP 1 or COMP 2 sig nal IC2A00 is a new IC Generic CXA2151Q It se lects the main picture YCbCr signals from The output of IC2A60...

Страница 48: ...YCbCr Select IC2B00 are Controlled by the SDA MN data line The SCL MN clock line provides tim ing for data transfer The internal circuitry of the ICs detects the format of the selected signals and in...

Страница 49: ...g circuitry of the VCJ For instance the genera tion of a drive signal for the Scan Velocity Modula tion SVM circuitry Note that the DM RGB signals are also input to the VCJ at pin 49 51 These inputs a...

Страница 50: ...The conduction of Q2W03 is controlled by the VBLNK and BLANK CRTlines The BLANK CRT line momentarily goes Low during a channel or input change momentarilyblankingtheCRTs The VBLNK line goes High if de...

Страница 51: ...pins 1 3 and 5 of IC2K00 are output at pins 37 39 and 41 and directed to the Monitor Output Jacks WhenthemainsignalsourceisHDorSDfromtheDM Module ThecircuitryintheDMModuleoutputsana log Y DM and C DM...

Страница 52: ...the Demodulator is the HDTransport Data Stream It is directed through the System Interface circuitry to an MPEG Decoder The Decoder outputs main picture analog RGB and also Separate Y and C sig nals...

Страница 53: ...Main Decoder outputs separated Horizontal and Vertical Sync The Sync Separator outputs composite sync CSYNC combined horizontal and vertical The CSYNC signal is applied to the Main YCbCr Select circu...

Страница 54: ...c Select IC are applied directly to the VCJ An additional sync source in the V19 is from DM Module When receiving a digital broadcast or digi tal cable signal the signal is decoded in the DM Mod ule a...

Страница 55: ...tical Drive is applied to IC4B01 the Vertical Output IC amplified and directed to theVerticalYoke Coils through the DY connector Horizontal Drive is amplified by Q5A33 and Q5A32 and applied to the bas...

Страница 56: ...g input The output of the Op amp controls the conduction of Q5A08 Conduction increases if the voltage at the emitter drops below 12 volts and decreases if the voltage exceeds 12 volts The HV 12V suppl...

Страница 57: ...Conversely if the feedback voltage is lower conduction time is increased X Ray Protect Figure 8 5 illustrates the X Ray Protect circuitry It is the same as in the V17 and V18 chassis The X Ray Protec...

Страница 58: ...was described This circuit cuts off all three CRTs to prevent phosphor damage due to loss of deflection Figure 8 6 shows the Deflection Loss Detection circuitry Q5A38 monitors horizontal deflection P...

Страница 59: ...or and monitors the AC OFF line When power is lost The AC OFF line momentarily goes High IC5H00 is triggered an outputs a positive pulse Q4A02 conducts pulling pin 25 of the Jungle IC Low HV is remove...

Страница 60: ...8 8...

Страница 61: ...initially received in a digital format from the ATSC QAM Tuner or the IEEE 1394 inputs The DM R and DM L signal are analog stereo signals that are directed to the Sound SourceSelectcircuitry The remai...

Страница 62: ...9 2...

Страница 63: ...outed from IC2K00 to the PIP Sound 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...

Страница 64: ...9 4...

Страница 65: ...ignals are directed D A Con version circuitry and are converted to analog sig nals The signals then pass through LPF circuitry remov inganyremaininghighfrequencydigitalsignals Then the signals are amp...

Страница 66: ...cuitry used in previ ous models is no longer required The same control signals from the Control circuitry are used C SDA I2 C Data Line C SCL I2 C Clock Line C ACK Command Acknowledgment line C BUSY B...

Страница 67: ...Summing Amplifiers TheLPFandSummingAmplifiercircuitryisshownin Figure 10 2 Three ICs are used in the LPF and Sum mingAmplifiercircuitry IC804 RH and GH LPF and Summing Amplifier IC803 BH and RV LPF a...

Страница 68: ...green raster distortion but does effect the red and blue raster Therefore greenrasterdistortionmustbeadjustedfirst before adjusting red and blue convergence Convergence Output Circuitry Figure10 3ill...

Страница 69: ...ous model TVs Figure 11 1 shows the LED Error Code Activation Procedure an is describe in the following 1 With the TV Off 2 Press and hold the front panel MENU and DEVICE buttons for 5 seconds 3 TheLE...

Страница 70: ...Code Probable Cause 12 Normal Operation No Error Detected 21 X Ray Protect 22 Short Protect 23 Loss of Horizontal Deflection 24 Loss of Vertical Deflection Table 11 2 Error Codes If DSP H and DSP V ar...

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