Zenith IQC50H94 Technical Training Manual Download

Page: 74 / 98

CIRCUIT DESCRIPTION

Video Circuit Block Diagram

I401 - Luminance Audio Selector IC

Main Tuner (TV1V) in

pin 63

Sub Tuner (TV2V) in

pin 60

Video 1 in from Terminal PWB

pin 8

S-Video 1 (Y) from Terminal PWB

pin 10

S-Video 1 (C) from Terminal PWB

pin 12

Video 2 in from Terminal PWB

pin 1

S-Video 2 (Y) from Terminal PWB

pin 3

S-Video 2 (C) from Terminal PWB

pin 5

Video 3 in from Front Control PWB

pin 15

S-Video 3 (Y) from Front Control PWB

pin 17

S-Video 3 (C) from Front Control PWB

pin 19

Yin1 PinP Luminance from 2L Comb filter

pin 49

Cin1 PinP Chroma from 2L Comb filter

pin 51

VOut1 PinP Video to 2L Comb filter

pin 53

YOut1 PinP (Y) to Sub video processor

pin 56

COut1 PinP (C) to Sub video processor

pin 58

V/YOut2 Main Video or S-Video (Y) to 3DYC

pin 44

COut2 S-Video (C) to 3DYC

pin 47

VOut3 Video out to Monitor

pin 41

YOut3 S-Video (Y) out to Monitor

pin 39

COut3 S-Video (C) out to Monitor

pin 37

I201 - Main Video Chroma Processor IC

Main video in (Y)

pin 40

Main video in (C)

pin 6

Y out

pin 37

R-Y Out

pin 48

B-Y Out

pin 47

I403 - Sub Video Chroma Processor IC

Sub video in (Y)

pin 40

Sub video in (C)

pin 6

Y out

pin 37

R-Y Out

pin 48

B-Y Out

pin 47

2 Line Comb Filter (PinP)

Video In

pin 4

Y Out

pin 1

C Out

pin 3

Summary of Contents for IQC50H94

Page 1: ...2YHUYLHZ KDVVLV HVFULSWLRQV DFWRU 6HWXS RQYHUJHQFH LUFXLW 7URXEOH 6KRRWLQJ Z E N I T H E L E C T R O N I C S C O R P O R AT I O N 2 0 1 J A M E S R E C O R D R O A D H U N T S V I L L E A L 3 5 8 2 4 3 U L Q W H G Q 8 6 H Q L W K O H F W U R Q L F V R U S R U D W L R Q C ...

Page 2: ...CONTENTS SafetyInformation 1 GeneralInformation 5 ServiceMenus 8 Convergence Setup 15 CircuitDescriptions 28 Troubleshooting 90 ...

Page 3: ...round water pipe conduit etc and the exposed metallic parts one at a time Measure the AC voltage across the combination of 1500 ohm resistor and 15 mfd capacitor Reverse the AC plug by using a non polarized adaptor and repeat AC voltage measurements for each exposed metallic part Voltage measured must not exceed 0 75 volts RMS This corresponds to 0 5 milliamp AC Any value exceeding this limit cons...

Page 4: ...RMAT Should be PROGRES SIVE mode 5 Attach the JIG 1k ohm 1 8W resistor to both ends of DH31 as shown in the diagram below SeeDiagram Checking Procedure 1 Check that the picture is turned off and the horizontaldeflectioncircuitstopsoperation AfterChecking 1 UnplugsetandRemoveJig Allowsettoremain in the off condition for at least 15 seconds 2 ApplyAC and confirm the set returns to normal operation C...

Page 5: ...ide of RN01 and to Ground as shown in the diagram below Check Number 2 1 The set can face any direction 2 Receive the Cross Hatch Signal 3 VIDEO CONTROLS Factory Preset 4 SCREEN FORMAT Should be PRO GRESSIVE mode 5 Attach the JIG B 100 ohm 1 8W resistor to right hand side of RN11 and to Ground as shown in the diagram below Checking Procedure 1 Check that the picture is turned off in either check A...

Page 6: ... as shown in Fig B L position Insert connector until CLICK sound is heard 2 Make sure the connector is pressed right in so that it has a good contact with the spring 3 Confirm the contact by pulling the connector slightly Don t pull hard because it may damage the connector 4 Cover the high voltage output by carefully pushing silicon boot onto it Don t turn the connector Note Make sure the silicon ...

Page 7: ...ion 50 Series Models 60 Series Models UHF 14 69 Height 52 60 1 2 EXT Mid A 5 A 1 4 Width 43 1 2 51 1 2 CATV Mid A I Depth 23 1 2 26 1 2 CATV Super J W Weight 190 308 CATV Hyper W 1 W 28 Power Supply P W B C P T B P W B Picture I F Carrier 45 75 MHz VM P W B C P T G P W B Sound I F Carrier 41 25 MHz Surround P W B C P T R P W B Color Sub Carrier 42 17 MHz Signal P W B Power Deflection P W B 1 Volt ...

Page 8: ...features include a Delta 78 lens system single piece Fresnel screen with special cut of the front and back to add in distortion reduction when moving from one viewing position to another The screen also incorporates vertical black strip matrixing which gives an increased contrast ratio Finally the set comes with the tinted screen protector already installed to prevent damage to the screen scratche...

Page 9: ...L POWER DIGITAL SETUP SOURCE TV VIDEO Source Selector DIGITAL CONVERGENCE SETS ONLY EXIT 65 65 6 9 2 9 2 7 8 2 5 7 8 2 AUDIO TO HI FI R L ANT A To Converter VIDEO MONO AUDIO INPUT 1 INPUT 2 L R S VIDEO MONITOR OUT Y PB CB PR CR ANT B VIDEO MONO AUDIO R S VIDEO VIDEO MONO AUDIO L R S VIDEO Y PB CB PR CR ...

Page 10: ... set to activate the service menu 3 Receivesignalonmainpicture 4 Check the service menu items according to the following tables using the up and down buttons on RemoteControl 5 Press MENU key to exit service menu adjustment mode NOTE 1 If there is a different value than shown in table above for fixed data adjust it using buttons only in this case 2 When exchanging microprocessor and TV is turned o...

Page 11: ...ency Coring P02 ZP94 95 ADJUST MODE TA1300 33 75khz M 3375 H POSI 40 00 7F Horizontal Position FLEX CONT VD POS 3F 00 7F Vertical Position UPD64081 DYGA 09 00 0F Y Motion Detection Gain DCGA 06 00 0F Chroma Motion Detection Gain VAPGA 00 00 07 Vertical Aperture Controle Gain VAPIN 00 00 1F Vertical Aperture Controle Invert YHCOR 00 00 01 Y Output High Frequency Coring P03 ZP94 95 ADJUST MODE TA127...

Page 12: ...oot Balance Gain 82 YH DSB 00 00 03 Y Horizontal Dynamic Shoot Balance Gain 90 CH DSB 00 00 03 Color Horizontal Dynamic Shoot Balance Gain 69 YV CLP 00 00 0F Y Vertical Enhance Clip Offset 84 YH CLP 00 00 0F Y Horizontal Enhance Clip Offset P05 ZP94 95 FLEX CONT ATSC 480i 480p 1080i 720p 71 YV ENH 00 00 0F Y Vertical Enhance Gain 79 CV ENH 00 00 0F Color Vertical Enhance Gain 87 YH ENH 1080i 07 00...

Page 13: ...rtical Dynamic Shoot Balance Coring Amplitude 85 YHDSBC 00 00 07 Y Horizontal Dynamic Shoot Balance Coring Amplitude 92 CHDSBC 00 00 07 Color Horizontal Dynamic Shoot Balance Coring Amplitude 95 Y CRG 00 00 07 Y Coring Amplitude 99 C CRG 00 00 07 Color Coring Amplitude 64 YNR IN 04 00 07 YNR Input Level Gain 73 CNR IN 04 00 07 CNR Input Level Gain 80 YNRPAS 00 00 07 YNR Passage Level Limit 88 CNRP...

Page 14: ...m Position Offset 61 BS RGT 07 00 0F Black Strech Stop Pulse Right Position Offset 62 BS LFT 07 00 0F Black Strech Stop Pulse Left Position Offset P12 ZP94 95 FLEX CONT 120 TV CINE 01 00 01 TV Cinema Detection 121 T C DET 07 00 0F TV Cinema Detection Vertical Gate Area Start Position 122 T C UNL 01 00 07 TV Cinema Detection Unlock Protection Count 123 T C LCK 03 00 0F TV Cinema Detection Lock Prot...

Page 15: ... R Y PH 00 00 03 R Y Phase R B GA 02 00 03 R B Gain G Y PH 02 00 03 G Y Phase G B GA 00 00 03 G B Gain COLOR SYSTEM 01 00 07 COLOR SYSTEM P15 ZP94 95 TA1298 RGB BRT 50 00 7F RGB Brightness RGB CNT 50 00 7F RGB Contrast G DRV W 39 00 7F Green Drive WARM B DRV W 2D 00 7F Blue Drive WARM SUB CLR 10 00 1F Sub Color Demodulator SUB CNT 1F 00 1F Main NTSC Contrast VSM PH 05 00 07 VM Phase VSM GA 00 00 0...

Page 16: ...arse Progressive NTSC 6 Horz Position Adj Coarse HD 2 14H 7 Raster Tilt Progressive NTSC CLEAR 8 Beam Alignment Progressive NTSC 9 Raster Position Progressive NTSC CLEAR Horz Size Adjust Progressive NTSC CLEAR Horz Size Adjust HD 2 14 CLEAR 11 Vertical Size Adjust Progressive NTSC CLEAR 12 Beam Form Progressive NTSC 13 Lens Focus Adjust Progressive NTSC 14 Static Focus Adjust Progressive NTSC 15 B...

Page 17: ...ctory settings Pre HEAT PRESET EACHADJUSTMENTVR TO CONDI TIONAS SHOWN A Before Pre Heat Run 1 RedandGreenDriveVRontheCRTPWB Not onBlueCRT a 5 9 95 Pre set between the 12 o clock and 2 o clock position 2 SCREEN VR ON FOCUS PACK 6 5 1 95 PreSetfullycounterclockwise 3 Focus VR on focus pack 2 86 95 PreSetfullyclockwise CUTOFF ADJUSTMENTPREPARATION A Pre Heat Run should be finished ADJUSTMENTPROCEDURE...

Page 18: ...ght line at the center of the screen and set to the positionwhereredchromaticaberrationslightly appears inside and blue outside reference value 1 3mm withinthecross hatchpitchesspecified in next table When the red chromatic aberration appearing at both sides of the bright line is not equal observe the side with larger chromatic aberrationwhenadjusting 5 520 7 55 7 21 6 7 8 520 7 55 7 21 25 12 2 25...

Page 19: ...Won Deflection PWB Enter to DCUADJ Mode 3 Push key on R C Green cross hatch is displayed Then push QUIT key on R C Character pattern is displayed This is the PHASEsettingmode 4 Set PH H phase data as shown below using 4 and 6 key 5 Set PH V phase data as shown below using 2 and 5 key 6 Set CR H phase data as shown below using and key 7 Set CR V phase data as shown below using up and down arrow key...

Page 20: ...5 6 72 029 277 1 6 7 1 17 1 6 567 7 9 9 2 17 5 520 67 3 7 1 86 180 5 6 72 0 7 17 51 5266 7 17 5 72 7 9 9 2 17 5 7 5 RASTER INCLINATIONADJUSTMENT DEFLECTIONYOKE Adjustmentpreparation 1 The set can face any direction 2 Input the single cross test signal 3 Set video conditions to factory reset 4 The lens focus adjustment should have been completed screen format should be progressive 5 The electric fo...

Page 21: ...found in 3 6 If image position does not shift when Green G static focus Focus Pack is turned Green G beamalignmenthasbeencompleted 7 IfimagepositionshiftswhenGreen G static focus Focus Pack is turned repeat 2 6 8 Conduct beam alignment for Red R focus Focus Pack UFPK Blue B focus Focus Pack UFPK 9 Uponcompletionofadjustment fixbeamalign mentmagnetswithwhitepaint VERT HORIZ PICTURE POSITION ADJUSTM...

Page 22: ...theServiceOnly SwitchontheDeflectionPWB thenpressPower AdjustmentPrerparation 1 The set can face east or west 2 Set video conditions to factory preset 3 The electric focus should have been coarse ad justed 4 Start adjustment 20 minutes or more after TV is turnedon AdjustmentProcedure PROGRESSIVE MODE 1 Receive any NTSC signal 2 Press the SERVICE ONLY SW on DEFLEC TION PWB 3 LocatetheverticalsizeVR...

Page 23: ...er can be turned Be careful not to loosen the screw too much as this may cause movement of the lens cylinderwhentightening 16 1 6 5 8 Rotate the cylinder back and forth to obtain the bestfocuspoint whileobservingtheCross Hatch Observe the center of the screen Hint Located just below the screen are the two wooden panels Remove the panels to allow access to the focus rings on the Lenses 9 Aftercompl...

Page 24: ...ghtness balance Screen Adjustment VRs Drive Adjustment VRs Red on Focus Pack Red R873 on CPT P W B Green on Focus Pack Green R842 on CPT P W B Blue on Focus Pack AdjustmentVRs Screen adjustment VRs on Focus Block Drive adjustmentVRs on CRTP W B Red Drive R829R Green Drive R879G Preparationforadjustment 1 Start adjustment 20 minutes or more after the power is turned on 2 Turn the brightness and bla...

Page 25: ...at the same time using 56 buttons and then 4 button 2 Then adjust Sub Brightness using 34 buttons to increase or decrease the value according to figure Visuallyadjust 3 After adjustment press MENU button to exit VIDEO CHROMAADJUST mode Data is storedinmemory NOTE When selecting SUB BRIGHTNESS mode the microprocessor sets the CONTRAST and COLOR to MIN automatically but make sure that the other cond...

Page 26: ...tional lines appear one near the top and one near the bottom of the screen G Only Screen 6WDUWLQJ GMXVWPHQW 3RLQW RFDWLRQ QWHUVHFWLRQ RI OLQNLQJ XUVRU Press the MENU button to see all colors if the center cross is other than White 3 PresstheCursorKeystomatchtheselectedcolor to the green at the geometric center of the screen 4 Press the RECALL 0 or SOURCE buttons to select the next color to be adju...

Page 27: ...utton and then the DISPLAY button again to project the Green color only 3 Usethe2 4 5 and6keys up left down andright respectively to select the adjustment point Start at center adjustment point then move to top and bottom thenleftandright andfinallythecorners 4 Press the CURSOR KEYS at the selected adjustmentpointtomatchtheGREENhorizontal andverticallinestotheScreenJiglines Red 7X5 ModeAlignment 5...

Page 28: ...the RED GREEN internalcross hatchsignals 6 Repeat steps 3 and 4 for the Red 13X9 mode adjustments Blue 13X9 ModeAlignment 7 Press the SOURCE key to select the BLUE GREEN colors 8 Repeat steps 3 and 4 for the Blue 13X9 mode adjustment 9 InordertoSavesettings WRITEtoROM press the MOVE key 2 times When the data is stored Green dot will appear on the screen Hit MOVE tocontinue Whencomplete presstheser...

Page 29: ...5Z 924 10092 AUXILLIARY CURSOR RIGHT CURSOR UP CURSOR LEFT CURSOR DOWN GREEN 3X3 ADJUSTMENT RED 7X5 ADJUSTMENT REMOVE COLOR INITIALIZE RASTER POSITION ROM READ CROSSHATCH VIDEO MODE ADJUSTMENT ROM WRITE PHASE DIGITAL CONVERGENCE REMOTE CONTROL ...

Page 30: ...ters it arrives at the bridge rectifier D901 where it is converted to Raw 150VDC voltage to be supplied to the power supply switching transformerT901 pin 1 However one leg of theAC is routed to a half wave rectifier D902 where it is rectified routed through R905 and R906 both a 5 6K ohm resistor filtered by C907 clamped by a 30V Zener D904 and made available to pin 4 of I901 as start up voltage Th...

Page 31: ...903 Opti Coupler CAS 1 3 Drain I901 Switch Mode IC Protect Regulate 4 28V 35V 17 14 11 2 8 S903 Relay S902 Relay SW 35 PQS1 D912 G D927 G I905 I906 I907 SBY 11 PQD2 PQS1 SW 5 PQS2 I908 SW 12 PQD2 D949 G D931 G S901 AC Relay To Main Power Supply PQD1 Q905 Q901 D902 D903 R 5 Gnd Vin ZP94 95 SERIES CHASSIS STBY POWER SUPPLYCIRCUIT Q902 Q910 Figure 2 ...

Page 32: ...planationwilldescribetheTurningONand OFF of the projection television STBY 7V Regulator I905 Indicated by D927 The STBY 7Vsupply is generated from pin 11 ofT901 This output is rectified by D918 and filtered by C928 This supply is routed to the Stand By 7 Regulator I905 pin 1 This voltage is what illuminates the GreenVisualTroubleShootingLED D927 Power Supply Frequency of Operation during Run The s...

Page 33: ...ctivity of Q908 and Q909 During Stand By Q903 is turned on This allows the Base of Q908 to be pulled through D945 This action turns off Q908 When Q908 is off it doesn t supply emitter voltage to the collector of Q909 The base of Q909 is connected to 6 Low Detection in puts See the Sub Power Supply Shut Down Circuit explanation and diagram for further details When the power supply operates at 50 th...

Page 34: ...the RunVoltage is not LED will be BLINKING 4 Is the Set in Shut Down LED will be OFF As can be see there are two different scenarios that can cause D903 to be off Missing Start up voltage for the Driver IC and or the Sub Power Supply is in Shut Down PowerSupplyShutdownExplanation This chassis utilizes I901 as the Osc Driver Switch for the sub power supply just as the previous chassis have done Thi...

Page 35: ...D941 D921 Q909 C949 R959 Q908 R958 28V R957 D945 Q903 On Off On Off On Off D946 R960 D944 Sw 12V D943 Sw 5V D957 D958 Protect 1 PQS2 R198 Pin 10 D015 Sw 9V D014 Sw 5V D016 Sw 3 3V Sw 2 5V Q912 C956 R969 D951 R960 D952 Stby 11V D955 Stby 7V D959 D960 Protect 2 PQS2 R014 Pin 11 D032 Stby 5V D007 Stby 9V Stby 3 3V D954 D953 R968 R967 D956 11 12 ZP94 95 STBYPOWERSUPPLY Low Voltage SHUT DOWNCIRCUIT Vin...

Page 36: ...the cathode of the zener diode will rise If it gets to a predetermined level the zener will fire This action creates a Shutdown Signal Negative Voltage Loss Detection The purpose of the NegativeVoltage Loss detection circuit is to compare the negative voltage with its counter part positive voltage If at any time the negative voltage drops or disappears the circuit will pro duce a Shutdown signal I...

Page 37: ...rcuits are defeated because the SW Switched power supplies are turned off in standby to prevent erroneous of the shutdown circuit Q909 supplies the high for shutdown if any of the voltage loss circuits become activated Q909 requires emitter voltage to operate Emitter voltage is supplied from the emitter of Q908 Q908 s base is connected to Q903 which in turn is connected to the power on off line Wh...

Page 38: ...river SIGNAL PWB SUB POWER PWB DEFLECTION PWB SUB DEFLECTION PWB ZP 94 95 DEFLECTION Vcc PRODUCTION CIRCUIT Other Power On Off Circuits From I906 Stby 11V Reg PQD2 3 1 STBY 11V Start Up Power DP21 Power On by Remote Control or Front Power Key Press DP35 DP36 Q003 Q004 Turns on I009 SW 9V Reg and IS13 5V Reg on Surround PWB B GENERATION FOR THE DEFLECTION POWER SUPPLYDRIVER IC See Figure 1 Vcc for ...

Page 39: ...i Coupler OCP 1 3 Drain I901 Switch Mode IC OCP Source 4 10 17 13 2 8 QP01 D902 DP37 R 5 Gnd Vin PQD1 1 6 DP07 DP03 Protect PQD2 8V 120V 15 28V DP29 DP08 DP10 DP11 DP13 16 IP02 Heater PDC1 1 2 3 DP09 14 28V DP12 IP03 2 1 3 8V OFF ON 220V Convergence DCU Convergence DCU B 120V 1 DEF B 120V 2 HV PDC1 Convergence AMP Convergence Amp OFF ON ...

Page 40: ...the current supplied to the load During Stand By it operates at 200KHz GREEN LED 120V Deflection B DP29 The Deflection B 120Vsupply is generated from pin 13 ofTP91 This output is rectified by DP11 and filtered by CP17 This supply is routed to the Horizontal Drive Circuit and the HighVoltage generation circuit ThisvoltageiswhatilluminatestheGreenVisualTroubleShootingLED DP29 ZP 94 95 CHASSIS L E D ...

Page 41: ...DP31 DP33 SW 8V DP30 DP11 CP33 DP15 DP17 13 TP91 Deflection B 120V Excessive Voltage Det Deflection B 120V QP02 RP21 RP22 RP17 0 47 Deflection B 120V Excessive Current Det Q609 R645 0 68 Flyback TH01 Vertical Circuit Excessive Current Det 5 5CP DH40 DH24 DH26 QH07 DH30 QH08 D753 Q754 1 6 7 8 Deflection B 120V V1 Q777 D759 C769 H Blk D757 D756 D760 T752 28V Loss Det SW 8V Loss Det Heater Too High D...

Page 42: ...which keeps the base of Q1 pulled up forcing it OFF However if there is a short or excessive load on the B line the diode in effect will have a LOW on its cathode turning it ON This will allow a current path for the base bias of Q1 which will turn it ON and generates a Shut downSignal B VOLTAGE TOO HIGH DETECTION In this circuit a Zener diode is connected to a voltage divider or in some cases dire...

Page 43: ... DP27 and DP28 If any one of these circuits are activated the power supply will STOP and create a Power Supply Shut downCondition SHUTDOWN CIRCUIT Shut down occurs when the shutdown SCR QP01 is activated by gate voltage When QP01 receives gate voltage of 0 6V the SCR fires and give a ground path for the pin 5 of Connector PQD2 called PRO TECT This low is routed to the Sub Power Supply PWB and is i...

Page 44: ... voltage it s used for Excessive HighVoltage Detection If a problem occurs in this circuit the Exces sive HighVoltage Detection circuit wouldn t operate So it would be possible for there to be HighVoltage but the circuit detecting Excessive HighVoltage couldn t work DH26 is connected to DH24 which is normallyrectifyingpulsesofftheFlybackTransformerTH01 Thisrectifiedvoltageisnormallysentthrough DH2...

Page 45: ...rizontal Driver IC IH02 to defeat Horizontal Drive output the FlybackTransformerTH01 generates a pulse called Heater Note This does not go to the CRTs as heater voltage it is used for Exces siveHighVoltageDetection IfthisvoltagegoestoohighindicatinganexcessiveHighVoltagecondition the voltage divider comprised of RH54 and RH55 would impress a high on the cathode of DH31 This high is routed through ...

Page 46: ... Horizontal andVertical drive IC I701 Turns on the Relay providingAC to the Deflection Power Supply on the Power Deflection PWB HORIZONTALB ONAND OFFCIRCUIT See Figure 1 When the power supply goes into Stand By mode TV Off the Horizontal Drive signal for deflection is shut off Q002 and QP04 accomplish this The Low out produced from the Power On Off pin 53 of the Microprocessor routed through Q002 ...

Page 47: ...C964 Power Deflection PWB I701 H Drive IC 15 8 Def B Hoz Out Signal Sub PWB C544 2 5V I907 SW 5V Reg IC 5 1 I908 SW 12V Reg IC 1 5 2 2 3 3 VDD 5V L004 Q026 R029 D034 1 C074 STBY 5V 3 3V 3 9V 61 54 Reset I006 Reset 2 3 1 SBY11V 3 3V 3 3V C032 R053 I905 STY 7V 2 D035 Q002 I008 STBY 5V 1 3 2 SYB 7V PQS2 D928 D948 SW 12V R949 R950 28V D947 PQD2 1 DP21 RP38 RP37 QP04 DP35 DP36 3 L701 I906 STY 11V 2 2 3...

Page 48: ...llator or give a falsereading Aftercheckingforthepreliminaryfunctionalityofthecircuitsdescribedabove thencheckforactiveclock pulses leaving data port pins See the Data Communications Circuit Diagram for details If some other IC is grounding the data or clock pins the Microprocessor will not work This usually requires a pull up resistor Ifnopull upresistorisnotedintheschematic thentheresponsibility...

Page 49: ...Conv PinP Unit U205 DSP Err DSP SI DSP Sck DSPSS DSPRST FE Enable1 SO Select FE Enable2 AVDD 3 3V Test DSP S0 DSP Busy SCL2 SDA2 SCL SDA SCL SDA SCL SDA SCL SDA SCL SDA 3D YC Comb Filter Front Audio Control Front EQ Cent EQ Deflection 44 50 60 59 13 12 I701 IS10 IS05 U204 SCL SDA SCL SDA Cent LFE PinP Audio Control DAC3 IS01 IS08 SCL SDA Rainforest IC IX01 Reset 54 32 CLL 43 BVCOI 42 33 52 IS03 IS...

Page 50: ... PWB Data 15 DSP SS Control command to the DSP Unit for controlling Modes Data 16 DSP SCK Digital Surround Processor Clock Data 17 DSP S1 Control command to the DSP Unit for controlling Modes Data 18 DSP ERR Mute Mutes Audio when a DSP Dir input is detected DSP Error DC High 19 DSP Reset Resets the DSP module on the Surround PWB DC High 20 Clock Sent to the Level Shift I014 then to both Tuners and...

Page 51: ...ntal Blanking pulses 3 3Vp p for OSD positioning Generated from H Blk through Q006 H Blk 50 SD SELECT Sent through Q030 to I015 for setting the internal selection switches Hi Main Lo Sub DC 51 OSD BLK Outputs a pulse slight wider and in time with the OSD characters to clean up video where character will be displayed Data 52 TEST Use by the factory for internal test of the Microprocessor and to pla...

Page 52: ...idual keys Channel Up ground Channel Down 1K Volume Up 1K 1 5K or 2 5K Volume Down 1K 1 5K 2 7K or 5 2K AVX 1K 1 5K 2 7K 4 7K or 9 9K Menu 1K 1 5K 2 7K 4 7K 10 or 19 9K Controlling the On and Off state of the High Voltage Power Supply The Power On Off function switch has STBY 3 3Vapplied for the Sub Power Supply via pin 8 of the PFS connector through a 1K resistor The output of the Power On Off sw...

Page 53: ...e DSPI DSPRST PSU2 5 2 6 3 1 PSU1 2 1 IS03 Front Audio Control SCL2 SDA 2 IS08 Center LFE PinP Audio Control IS10 Center Equalizer IS05 Front Equalizer SCL2 SDA2 SCL2 SDA2 IS01 DAC3 SCL2 SDA2 I403 Sub Video Chroma PST1 Deflection PWB Signal PWB I701 9 12 8 11 13 DSP Unit HC4051 PMU1 5 6 I401 A V Select SCL1 34 33 SDA 1 FCEN SCL2 SDA2 SCL2 SDA2 10 11 12 4 5 4 5 17 16 17 16 14 15 3 2 SCL1 SDA1 IOO2 ...

Page 54: ...onrelatedtoallthechannelsfrequency band andchannelnumber The frequency is actually a given value for the Phase Lock Loop circuit within the tuner Then band is data to tell the band selection circuit in the tuner where the particular channel is located and the channel number is given to the microprocessor to indicate what OSD outputs to pro duce When the set is first opened it s in what is called F...

Page 55: ...between the Phase comparators reference frequency The error voltage is routed back to the main internal Oscillator in the front end to correct forTuning errors SeetheMicroprocessorDataCommunicationsCircuitDiagramExplanationforDetailsrelatedtoData CommunicationforcontrollingtheMainTuner Automatically Controlling theTuners when Channels are changed PinPTUNER As far as the internal function of the Pi...

Page 56: ...sort of variable resistor and according to how much sharpness the customer has selected determines how much of the transition signal is added to the original signal The greater the sharpness setting the greater the transition signal added Controlling theAudio Circuits when directed by the Customer The customer has control over how the set accesses audio information for all of it s inputs The tuner...

Page 57: ... or 4 an internal mechanical switch inside the S Jack tells the Microprocessor an S Jack is inserted Then when that particular input is selected it automatically selects S as it s source The same thing holds true for Component inputs The set should never have Component inputs and S Jack inserted at the same time This will cause a black and white picture will be displayed PAGE 02 11 Use this explan...

Page 58: ...he Clock and Data lines must be routed through the Level Shift IC I014 to be brought up to 5V Clock and Data from the Microprocessor arrive at I014 Level Shift at pins 2 and pin 3 and are output at pin18 and pin17 They arrive at the MainTuner at pins 4 and 5 PinPTuner U202 TheonlydifferenceforthePinPtunercontrollinesisrelatedtothePinPEnableline Thisisoutputfromthe Microprocessor pin 43 FEENABLE2 t...

Page 59: ...n out of the Main Microprocessor I001 The Main Microprocessor sends Clock and Data via I2C bus to the DAC1 IC The output from the Microprocessor is pin 2 SDA1 and 3 SCL1 which arrives at the DAC1 IC at pins 5 and 6 respectively ThefollowingisalistoftheinputandoutputpinsonDAC1 PIN FUNCTION 1 IR Det The IR pulse from the Remote Control is monitored whenAuto Link is set See AutoLinkinIndex 2 YN Det A...

Page 60: ...micFocusHorizontalParabolic generator to compensate for phase distortion Also notifies I701 HorizontalDrivegenerationICconcerningtheHorizontaloperation frequency 8 Gnd Ground 9 CS Sel Not Used 10 Busy Informs the Microprocessor that the DCU is in the Digital Conver genceAdjustment Mode The Micro Ignores IR pulses 11 SAD0 Ground Not Used 12 SAD1 Ground Not Used 13 SAD2 IC B STBY 5V 14 SDA Data I 2 ...

Page 61: ... Cb NTSC Only Communication from the Microprocessor via pins 59 SDA2 and 60 SCL2 to connector PST1 pins 1 and 2 I403 pins 34 and 33 respectively ON THE DEFLECTION PWB Sweep Control I701 The Sweep Control IC is responsible for generating Horizontal Drive andVertical Drive signals The Micro processor must tell the IC when certain things are done in the Service Menu When Cut Off is performed theVerti...

Page 62: ...ntrols QS25 to add Front Left and Right to Sub Woofer 8 Gnd Ground 9 P Vol PerfectVolume On Off controlled by the customer s menu Note when in Pro Logic mode PerfectVolume is Off 10 DSPREQ DSP Request Input 11 SAD0 Ground Not Used 12 SAD1 Ground Not Used 13 SAD2 Ground Not Used 14 SDA2 Data I 2 C communications between DAC3 and Microprocessor 15 SCL2 Clock I 2 C communications between DAC3 and Mic...

Page 63: ...he audio determined by the customer s menu Such as Off Matrix Hall etc Control for the DSP is routed from the Microprocessor pins 15 DSPSS DSP Surround Sound Mode 16 DSPSCK DSP Clock 17 DSPI DSP Mode 1 18 DSPERR Mute DSP Error Mute and 19 DSPRST DSP Re set Then to the Level Shift IC I014 pins 5 6 8 7 and 9 respectively These signals are then routed to the PSU2 connector pins 5 2 3 6 and 1 respecti...

Page 64: ...D Size V Blk IX01 Rainforest PSD1 1 QX09 QX36 QX31 B G R 41 42 43 QX41 P Blk OSD Blk PZC 5 3 1 Signal SUB PWB Dig B 13 2 6 Dig G 4 12 QK07 4 Dig R 11 6 2 39 38 37 56 51 3 2 28 Sync for Closed Caption 30 Sync2 for Closed Caption Main Sub QX08 QX07 PSZ1 18 16 14 Q007 19 OSD YM 40 Half Tone 20 Q013 12 10 8 7 I004 DAC 15 14 SCL1 DAL1 10 BUSY 37 38 39 QX03 QX02 QX01 33 34 35 32 47 36 QK08 QK06 Analog B...

Page 65: ...asYS1 signal which mutes the video P Blk Picture Blanking Pin 56 This pin is responsible for muting the video when the Microprocessor deems it necessary This would be during power up or power off child lock channel change or selecting a video input with no video input available PBlk is produced from pin 56 of the Microprocessor This signal is then routed through Q007 through the PSZ1 connector pin...

Page 66: ...ollector goes low and pulls the base of Q023 low turning it ON The emitter of Q023 is connected to STBY 11V so when it turns ON it s collector output goes HIGH This high is now calledV Mute 1 V Mute 1 is routed to two circuits for Video Mute and forAudio Mute FOR VIDEO MUTE There are three different signals used to mute video on the Rainforest IC IX01 pin 25 FBP In First V Mute 1 high is routed th...

Page 67: ...Output Mute CC03 4 2 R In R Out L In L Out CC04 11 13 2H Video PWB Signal PWB SBY 11V 45 A5V CC01 CC02 7 12 Mute Lo DN08 RN15 C008 R007 C009 DN09 PQS1 R008 From I904 Pin 3 AC Photo Coupler AC Sig Q001 10 R010 D029 R193 R194 Q022 R029 R190 R191 R198 C070 V Mute 1 R195 Q024 R196 V Mute 2 DC04 ERRMute QC02 RC04 QC01 RC03 QC03 RC07 DC03 RC08 CC08 RC09 CC09 QX18 12 6 H Blk FC V Blk FC DX09 DX08 DX08 RX...

Page 68: ...the FrontAudio output IC into Mute Second to the anode of DC02 then to the base of QC01 and QC02 which grounds the audio input to pin 4 Right audio in and 2 Left audio in of IC01 AC LOSS DETECTION AC is monitored by theAC Loss detection circuit TheAC input from PQS1 pin 10 is rectified by DN09 This charges up C009 and through DN08 it charges C008 WhenAC is first applied C008 charges slightly be hi...

Page 69: ...rom Pin11I601 Horizontal Blanking From Q755Emitter QN05 QN03 QN04 QN02 QN01 IH02 1 Drive HighVoltage Driver IC PSD3 2 I701 24 DAC3 Horizontal and Vertical DriveIC R718 HVcc Spot Inhibit DN12 WhenVertical Driveis turnedOffduring adjustment I2 C DN13 DN09 QN07 DN05 QN08 SW 12V 14 RN15 Stops Drive RN14 RH60 Stops HighVoltageDrive Signals Frombeing produced whenSweepLossis detected HDrive QN08 SeeDefl...

Page 70: ... which puts a high on the base of QS20 turning it ON This grounds the SubWoofer audio output 3 DS44 which puts a high on the bases of QS17 and QS16 turning them ON This grounds the Out to Hi Fioutputs 4 DS34 which puts a high on the base of QS08 and QS09 turning them ON This grounds the audio input to the Rear audio output IC IS16 at pins 4 and 2 ERRMUTE PIN 14 of the PSU2 CONNECTOR TheERRMutesign...

Page 71: ...dio Output Mute CSJ5 4 2 C In C Out C In C Out CSJ4 11 CSJ3 CSJ2 7 12 Mute Lo ERRMute QS05 RS04 QS04 RS03 QS06 RSF5 RSF6 CSJ9 RSF7 CSK01 PSU1 6 7 14 V Mute 2 PSU2 14 ERR Mute IS01 6 8 Mute VMute IS16 REAR Audio Output Mute CSM4 4 2 R In R Out L In L Out CSM3 11 CSM2 CSM1 7 12 Mute Lo QS08 RSJ5 QS09 RSJ6 QS10 RSJ7 RSJ8 CSM8 RSJ9 CSM9 DS37 DS27 CENTER DS26 VMute Mute CSpkOff REAR R REAR L DS36 RSpkO...

Page 72: ...cate PP1 and add a jumper between pins 1 and 2 of the PP1 connector as shown below Hold jumper in place for 5 seconds A beep will NOT be heard Removethejumper Confirm EEPROM reset Input source is now set toAir and not to Cable 1 or 2 No Child Lock and only channels 2 through 13 are in memory Reassemble Chassis and reinstall PTV back Set is now ready to operate NOTE All customers Auto Programming a...

Page 73: ...Line Comb Filter V In Y Out C Out S Det S Det S Det 56 PinP Yout2 18 Q206 14 TV1V TV2V 4 1 3 51 CIn1 41 Vout3 Q409 Monitor Out 32 PinP C Cout2 39 37 Q410 Q411 Y S Monitor Out Yout3 Cout3 Q405 Q404 I403 40 6 V3V PST1 Q403 Q406 Q408 37 46 47 Y R Y B Y See Component Signal Flow Diagram for Continuation 44 Q402 47 Q401 V Yout2 Cout2 13 9 Main C PST2 5 7 I201 40 6 9 7 Q216 Q213 Q235 Q214 Main C Main Y ...

Page 74: ...minancefrom2LCombfilter pin49 Cin1PinPChromafrom2LCombfilter pin51 VOut1 PinPVideo to 2LComb filter pin 53 YOut1 PinP Y to Sub video processor pin56 COut1 PinP C to Sub video processor pin58 V YOut2 Main Video or S Video Y to 3DYC pin44 COut2 S Video C to 3DYC pin47 VOut3Video out to Monitor pin 41 YOut3 S Video Y out to Monitor pin39 COut3 S Video C out to Monitor pin37 I201 Main Video Chroma Pro...

Page 75: ...omponent 1 Component 2 Select IC Selects either Component 1 or Component 2 Y CbPb CrPr Outputs to I404 I404 Sub Video Component Select IC Selects either Component 1 or 2 Y CbPb CrPr from I407 and Sub R Y B Y Y from I403 Outputs to Flex Converter Sub inputs Flex Converter Receives Main R Y B Y Y from I205 and Sub R Y B Y Y from I404 Combines the two sets of signals Main and Sub Converts output sign...

Page 76: ...Q226 Q227 Q228 9 PST2 1 3 14 5 8 6 I407 1 2 1 2 1 2 Y Cb Pb Cr Pr 1 7 21 3 9 19 5 11 15 I404 1 2 1 2 1 2 Q416 Q417 Q418 Q419 Q420 Q421 Q422 Q423 Q424 PST2 5 4 3 U205 PFC1 19 17 15 48 47 37 I403 19 18 17 Sub B Y Cb Out Sub Y Out Sub R Y Cr Out SUB PICTURE MAIN PICTURE FLEX CONVERTER I201 48 47 37 Terminal PWB Signal PWB Signal PWB 11 16 Cr Pr1 Cr Pr2 Cb Pb2 Y2 Y1 9 Q440 Q441 Q442 16 18 20 PFC2 15 1...

Page 77: ...75 CIRCUIT DESCRIPTION ComponentVideo Circuit Block Diagram Explanation ...

Page 78: ...2H CR IX03 QX25 QX23 QX22 2H CB 2H CB 2H CR 2H CR QX24 QX54 QX26 QX55 QX27 2H CR 2H CB 2 3 4 5 6 1 SW9V IX04 5 I Q 1 3 2 4 11 IX02 1 2 1 2 14 1 QX52 QX53 Q I I Q 16 2H CB 51 52 IX01 5 3 U Q In V I In Rainforest IC RGB Processor YCBCR YIQ Selector SUPER MATRIX YCBCR YIQ CONVERTER Q I I Q FLEX CONVERTER U205 Signal PWB 2H VIDEO PWB SW9V ...

Page 79: ...PbY YIQ YUV CHROMAROTATION CIRCUITEXPLANATION QUESTION What is the function of QX22 QX23 QX24 QX25 QX26 and QX27 on the output of the 3DY C Combfilter ANSWER The RGB Processor IX01 TA1298AN has a function called SkinTone correction This circuit is also named Auto Color orAuto FleshTone TheAuto Color function works only withY I Q signals The YUVsignal out of the Comb filter must be converted toYIQ ...

Page 80: ...2 V2 1 3 S 2 In 5 S Det S Det S Det 18 Q206 14 V3V PST1 PFT 3 PST2 Sub Video VOut2 3 Main Y Video I005 Z1 Z0 3 5 Q210 Q208 I001 Q019 Q018 4 4 Main Sub SD Det I003 53 44 Q403 Q402 Q021 28 Main for CCD 30 Sub for CCD Q031 Q017 2 Q016 Y In Det SDA1 SCL1 SCL1 SDA1 2 3 15 14 SIGNAL PWB 1 of 2 Composite 2 Composite 1 I015 1 4 10 I016 1 4 11 PST1 8 9 Q434 Q437 Q431 Q433 Component 1 Y Component 2 Y Sync S...

Page 81: ... I001 microprocessor IC Comp 2 VFDet Horizontal sync out goes to I005 Main Sub Select IC I005 Main Sub Select IC Select control from I001 microprocessor SD Sel Station Detect Low Main High Sub Three separate sets of inputs outputs only first two shown in graphic pin 3 SubVideo In pin 5 MainVideo In pin 4 Sub Main SD Det Out pin 2 Comp 1 H sync In pin 1 Comp 2 H sync In pin 15 Comp 1 2 HFDet Out pi...

Page 82: ... 5 10 11 4 5 12 13 10 9 2 1 4 3 U205 8 7 15 14 PTS2 3 1 Sub H Sync Sub V Sync I405 1 2 1 2 15 10 9 4 Q428 2 I403 4 2 14 40 13 H Out V Out 3 I408 4 2 5 Q415 Q442 1 TERMINAL PWB SIGNAL PWB Flex Converter MHW MVW SVW Sub Video Chroma Select 3 Hi Main NTSC Lo Main Component Select 4 Hi Sub NTSC Lo Sub Component Select 3 Select 4 Sync Sep Sub Sync Sel Select 4 1 Q425 9 1 I407 1 See Component Signal Pat...

Page 83: ... by DAC2 line from I201 MainVideo Chroma Processor IC Outputs selected H and V sync to I203 Sync Inverter IC I407 Sub Component 1 Component 2 Select IC SelectedYoutput on pin 6 I408 Sub Component Sync Separator Y in on pin 1 H out on pin 2 V Out on pin 4 I409 Sync Inverter H sync from I408 is inverted and applied to I405 I403 Sub Video Chroma Processor NTSC MainVideo in Y on pin 40 Vertical sync o...

Page 84: ...uts Main H MainV Sub H SubV go to Flex Converter for PinPtiming purposes Main H labeled MHW at Flex Converter Main V labeled MVW at Flex Converter Sub H labeled SHW at Flex Converter Sub V labeled SVW at Flex Converter DP 05 DP 05FCOMPONENT SYNC SEPARATION BLOCK DIAGRAM ...

Page 85: ...n CircuitDiagramis The DP 05 and DP 05F PinP circuit doesn t route the Component inputs to the PinP Signal route into the Flex Converter Therefore the PinPin the DP 05 and DP 05F only produces NTSC inputs routed through the Selector IC The Sub Component Selector IC I407 is not used The Sub Component Sync Separator IC I408 is not used The Sub Component or Main NTSC Sync Selection IC I405 is not use...

Page 86: ...orest IC ABL SDA2 PSZ2 SDA2 16 To Anodes ABL To QH01 Collector of Horz Output Transistor 2H Video PWB or Signal Sub PWB Deflection PWB Clamp ABL Pull Up Resistors As Brightness goes Up ABL Voltage goes Down Inverse Proportional Current Path QX13 RX34 RX36 5 27 See uP Data Signal Path DH33 RH56 Deflection B 120V V1 PSD3 1 DX03 CX32 CX34 PSZ1 SCL2 SCL2 17 28 TH01 RH67 LH03 CH31 RX32 ...

Page 87: ... emittervoltagewhichinturndropsthecathodevoltageofDX05 Thisinturnwillpullvoltageawayfrompin 45 of the Rainforest IC IX01 Internally this reduces the contrast and brightness voltage which is being controlled by the I 2 C bus data communication from the Microprocessor arriving at pin 27 and 28 of the RainforestICandreducestheoverallbrightness preventingblooming SUB BRIGHTNESSADJUSTMENT I 2 CAlignmen...

Page 88: ...in 11 I601 Horizontal Blanking From Q755 Emitter QN05 QN03 QN04 QN02 QN01 IH02 1 Drive High Voltage Driver IC PSD3 2 I701 24 DAC3 Horizontal and Vertical Drive IC R718 HVcc Spot Inhibit DN12 When Vertical Drive is turned Off during adjustment I2 C DN13 DN09 QN07 DN05 QN08 SW 12V 14 RN15 Stops Drive RN14 RH60 Stops High Voltage Drive Signals From being produced when Sweep Loss is detected H Drive Q...

Page 89: ...rrent flow from emitter to collector and up through RN07 which is located across the emitter base junction of QN04 to the 11Vstandby supply This increase of current flow through RN07 will bias on QN04 and the events described previously will occur Loss of Horizontal Blanking Whenthe11 6VpppositivehorizontalblankingpulseismissingfromthebaseofQN05 itwillbeturnedoff which will cause the collector to ...

Page 90: ...LED QH01 PCB PDF RH44 High Voltage ADJ RH44 TP91 PMB PMR PMG YOKE PLUGS SK01 SERVICE SWITCH PSD1 CONVERGENCE HEAT SINK FBT TH01 REAR VIEW R630 V Size Adj R683 H Size Adj R686 H Size Adj HD DP37 Red LED DP01 IP01 PQD1 Q701 D752 Q777 Q657 D657 D656 IK01 QK01 QF06 PCG PCR PQD2 PDC1 IK04 IK05 PSD1 PSD2 PSD3 ...

Page 91: ... P W B DIAGRAM QS4 U204 3D YC REAR VIEW U205 FLEX Conv and PinP Unit U201 Main Tuner U202 PinP Tuner PP1 I001 PFS SURROUND PWB 2H VIDEO PWB TERMINAL PWB MICROPROCESSOR I010 I011 I012 PR PL IC01 DIGITAL BOARD HC4051 I007 LINE COMB PWB ...

Page 92: ...W B DIAGRAM DAG P851 R879 P852 Cathode GREEN E831 P801 R829 P802 Cathode RED BLUE E8A1 P8A1 PTSB P8A2 CATHODE PVB GND SHORT TO KILL THE COLOR PRV GND SHORT TO KILL THE COLOR PGV GND SHORT TO KILL THE COLOR PTSR E801 W801 W801 PTSG DAG DAG ...

Page 93: ...NG TRANSFORMER REAR VIEW PQD2 PQS1 PQU1 PQS2 PQU2 D949 STBY 11V GREEN D931 SW 5V GREEN D927 STBY 7V GREEN D912 Audio F SW 29V GREEN RED or GREEN LED USED FOR VISUAL TROUBLESHOOTING D901 I901 S901 S904 S903 S902 PQD1 PQS4 PA F901 6 Amp I906 I907 I905 1 9 1 10 1 11 7 1 1 8 2 1 2 1 1 3 ...

Page 94: ...92 Troubleshooting MENU PFJ PFV SM09 SOURCE VOL VOL CH CH POWER CONTROL P W B ...

Page 95: ...tage at PQS2 pin 1 7volts No No Check I001 pin 54 Does reset occur Replace I006 Replace X001 Check I002 Replace I001 Check I001 pin 63 Is 1 6v present Check I001 pin 62 is 4mhz present Check Q008 Q009 I904 D909 Check Q003 Q004 D922 S901 Q002 No Yes Yes Replace I001 No D927 SMPS STBY 7v Check D918 I905 I008 I010 Yes Yes No Yes No No Yes Yes No No Yes Yes Yes Yes To page ____ Inspect Red LED DP37 on...

Page 96: ... 9 format thus causing the lines to thicken overlap and distort the picture In DiagramA a DTV signal of 4 3 and 480p is allowed to pass through unaffected since 480p is the native format for the 95 95 series RPTV Astandard broadcast or cable signal at 270i will be processed by the D3 Flexconverter and upconverted to be displayed at 1080i in a 4 3 aspect ratio The 480i signal from a converted digit...

Page 97: ...0i 480p 720p in 16 9 Aspect Ratio 480i 480p 720P D3 FC 16 9 ASPECT RATIO OF IMAGE DISPLAY IN 4 3 SCREEN AVSL OF 360p Lines Watchable Picture 480p Lines 480p DIAGRAM A DIAGRAM C DIAGRAM B DTV AT 1080i IN 16 9 ASPECT RATIO 1080i D3 FC 16 9 ASPECT RATIO OF IMAGE DISPLAY IN 4 30SCREEN 1080i AVSL of 810i Lines Watchable Picture 1080i Lines Signal ACCEPTED Image DISPLAYED Signal ACCEPTED Image DISPLAYED...

Page 98: ......

Search results

Summary of Contents for IQC50H94

Reviews:

Related manuals for IQC50H94

Brands by name

Popular brands

Zenith IQC50H94, Technical Training Manual

Search results

Summary of Contents for IQC50H94

Reviews:

Related manuals for IQC50H94

Brands by name

Popular brands