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MID - Multi Image Driver

The world of NTSC has been a simple world. The 480i video cameras
give their signals to 480i video recorders, 480i production switchers, 480i
broadcasting, 480i videocassettes, 480i videodiscs and ultimately 480i
home television receivers. This world is comfortable and compatible, but
it’s already rapidly changing.

A blossoming range of image standards
Unlike entertainment-oriented television, computers have long used pro-
gressive scanning to maximize the legibility of on-screen text. For ex-
ample, the popular VGA computer standard uses progressive scanning
640 h x 480 V pixels. In video terms, that’s 480P.

Digital Television (DTV) broadcasting embraces both interlace scanning
and progressive scanning. A convergence technology is needed to link
the two previously separate worlds of entertainment and information.

Sony’s solution
Sony’s new Multi-Image Driver (MID) circuitry contains a special “Twin-
View” function that can display either a High Definition or a Standard Defi-
nition video signal together with any VGA source. This is a proprietary
integrated circuit based on company expertise in broadcast-quality Digital
Multi Effects systems. Some (but not all) Sony televisions with MID will
enable viewers to combine two different signal formats on the same screen.

MID works by converting both signals to VGA (480P) display. Supported
signal combinations include:

·

NTSC + NTSC

·

NTSC + HD

·

VGA + NTSC

·

VGA + HD

MID circuitry can mix
High Definition video
with computer VGA
images or HD and NTSC

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Summary of Contents for TVP-08

Page 1: ...S Training Manual Circuit Description and Troubleshooting Course TVP 08 Projection Television ...

Page 2: ...d by National Training Department Sony Service Company A Division of Sony Electronics Inc Course presented by______________________________________ Date___________________________________________________ Student Name ___________________________________________ ...

Page 3: ...Sony Service Company A Division of Sony Electronics Inc 1998 All Rights Reserved Printed in U S A Sony and Trinitron are registered trademarks of Sony ...

Page 4: ...er Supply 11 Overview 11 Standby Switching supply 11 Vcc Switch Power On 13 Overview 13 Power ON 13 DC Protect 13 AC Protect 13 Soft Start 15 Overview 15 Soft Start Power ON 15 Converter 17 Overview 17 Operation 17 T602 Secondary Audio B 19 Overview 19 Operation 19 T601 Secondary 1 21 Overview 21 15 Volts 21 11 Volts 21 22 Volts 21 Distribution 21 T601 Secondary 2 23 7 Volts 23 135 Volts 23 135 Vo...

Page 5: ... 33 Reset 35 Overview 35 Initial Reset 35 Power ON Reset 35 System Block Diagram 37 Overview 37 B Standby Bus 37 M Main Bus 37 P Auto Registration Bus 37 MID Bus 37 Video Path Block 39 Inputs 39 Main Video 39 Sub Video 39 IC511 Video Processor 39 Input Switching 41 Overview 41 Inputs 41 Outputs 41 Main Y and C Buffers 43 Overview 43 Y Buffer 43 Sync Separator 43 C Buffer 43 3D Comb Filter 45 Overv...

Page 6: ... MID Inputs 63 MID Processing 63 MID Outputs 63 MID Troubleshooting 63 Video Processor 65 Overview 65 Video Processing 65 Sync Processing 65 IK AKB 69 Overview 69 Video Drive 69 IK 69 Troubleshooting 69 Sync Paths 71 Overview 71 Sync Paths 71 Deflection Block 73 Overview 73 Vertical 73 Horizontal 73 High Voltage 73 Convergence 73 Horizontal Deflection Block 75 Horizontal Jungle 77 Overview 77 H Dr...

Page 7: ...w 91 V Out 91 V Protect 91 High Voltage Block 93 HV Drive 95 Overview 95 HV Drive 95 Peak Drive 95 HV Regulation Control 99 Overview 99 Regulation Control 99 12 High Voltage LVP 99 HV Regulation PWM 101 Overview 101 Sawtooth Generator 101 PWM 101 HV Stop 2 103 Overview 103 ABL 103 Hold Down 103 HV Stop 1 105 Overview 105 ABL 105 High Voltage Block Tap 105 125 Volt OVP 105 Convergence Block 107 Ove...

Page 8: ...igital Convergence 115 BD Output 117 Overview 117 IC1707 Regi Correction 117 Convergence Out 119 Overview 119 Regi Mute 119 Convergence Amp 119 Service Mode 121 Overview 121 Normal Service Mode 121 PJED Mode 121 Protection Block 127 Overview 127 Diagnostic Indication 127 Circuit Description 129 ...

Page 9: ...ck stripes to increase contrast Built in High Contrast Screen First Surface Mirror Unlike most mirrors the reflective surface is on the front of the mirror glass This improves brightness and con trast and eliminates ghosting caused by the reflected light passing through the glass Advanced Velocity Modulation Advanced High Voltage Regulation Eliminates distortion and fo cus fluctuations that occur ...

Page 10: ...2 NOTES ...

Page 11: ...osis item Standb y Self diagnosis sleep lamp screen displa y Number of b links Diagnosis item Results Power not ON Not lit B OCP detection LED blinks 2 times 2 B OCP XX B OVP detection LED blinks 3 times 3 B OVP XX V detection LED blinks 4 times 4 V STOP XX AKB detection LED blinks 5 times 5 AKB XX H detection LED blinks 6 times 6 H STOP XX HV abnormality detection LED blinks 7 times 7 HV XX Audio...

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Page 13: ...evel repair Name Circuits contained A Tuners A V switching RGB processing H Jungle VDSP Syscon BD Auto registration Digital Convergence BM MID Multi Image Driver BR DRC Digital Reality Creation CR CB CG CRT drive and IK feedback D H and V deflection Sub deflection HV HV Regulation G Power supply HA Front panel controls Power and Timer LEDs HB Front video inputs Auto Focus and Setup buttons HC Remo...

Page 14: ...6 HC HA HB CG ZB CB G D BD BR BM A U K CR ZR ZG ...

Page 15: ...s keeps the initial start up voltage low and prevents excessive back EMF from destroying the converter transistors When regulation begins the normal operating frequency is around 73KHz Converter When the Oscillator circuit begins oscillating it outputs two signals that are 180 degrees out of phase These signals are applied to the converter circuit The converter circuit contains two Driver ICs that...

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Page 17: ...which is filtered by C6008 C6010 and L6003 This volt age is used as the B for the switching power supply converter circuit and is fused by F6002 D602 4 is connected to ground through R6010 In Rush Current Limiter at initial power ON When the secondary sup plies begin to run RY6002 will be closed which connects D602 4 to Hot ground Switching B Low Voltage Protect Both outputs of the D602 Bridge Rec...

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Page 19: ...then to T603 SRT IC6001 is connected to T6003 1 and begins switching when the voltage arrives IC6001 PWMSW is a self starting N channel MOSFET switching device with a self contained oscillator and error loop amplifier used for regulation RM 5 As IC6001 PWMSW voltages are induced in the secondary windings of T6003 SRT one of these voltages is used to develop the RM 5 line The signal from T6003 7 is...

Page 20: ...12 ...

Page 21: ... phototransistor inside IC6104 Vcc Switch ON When this occurs current flows through the B E junction of Q6001 When Q6001 turns ON it causes Q6011 VccSW to turn ON This switches the Standby voltage through Q6011 VccSW where it is called Vcc Vcc turns RY6001 Power Relay ON as well as powering the Soft Start Oscillator and Driver circuits DC Protect The DC protection latch circuit is connected throug...

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Page 23: ... Q6005 provides a discharge path for C6016 when the set is turned OFF This is important because if C6016 is not completely discharged the os cillator may output the normal operating frequency during Power ON The discharge path would be through Q6005 C E junction Q6005 is OFF during the set s operation because of the voltage applied to it from IC6011 3 Be careful when measuring voltages at Q6005 B ...

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Page 25: ...C6002 6 and IC6004 6 The return is at pin 5 of IC6002 and IC6004 This float ing supply allows a 130 Vpp signal to be output for each Hi side driver If IC6002 7 is outputting a High signal then Q6008 turns ON When Q6008 is ON it allows the 130 volt Switching B to be present at Q6008 S This voltage is applied to IC6002 6 the floating supply input and also to C6022 and C6023 The signal seeks ground t...

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Page 27: ...ered by C6120 and C6128 to create the 19 volts The 19 volt supply is output at CN6102 7 and 8 It also goes to D6122 A which is part of the protec tion circuitry The 19 volt supply is output at CN6102 2 and 3 Troubleshooting If the rest of the power supply is working but there is a problem with these supplies you should suspect a problem on the K board The set can be run with CN6102 unplugged If th...

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Page 29: ... 12 is applied across D6102 through L6103 and L6104 C6122 C6133 and L6110 filter the rectified voltage This voltage is used on the G board by the regulation and pro tection circuits and it exits the G board at CN6104 11 to the A board The 11 volt supply is used on the A board to produce the 9 volt supply 22 Volts The voltage from the winding of T601 14 and 15 is applied across D6108 through PS6105...

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Page 31: ...urrent the voltage across R6118 falls closer to being negative The OCP circuit monitors this voltage 135 Volts The voltage from the winding of T601 8 and 9 is applied across D6103 and D6106 C6113 C6127 and L6105 filter the rectified voltage It exits the G board at CN6106 3 33 Volts The 135 volt line goes through R6111 Current Limiting resistor On the other side of R6111 is D6110 Zener Diode and C6...

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Page 33: ... of the internal transistor inside IC6005 When this tran sistor conducts harder it causes more current to flow through D6023 and D6024 This in turn lowers the voltages at IC6003 2 and 6 When these voltages are lowered the frequency output of IC6003 Oscillator is low ered The oscillator output is at IC6003 9 and 10 When the frequency output is lowered it becomes closer to the resonant frequency of ...

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Page 35: ...c feature If OVP occurs the Timer LED will flash three times See the Protection Block section for more details 135 Volt Over Current Protection The over current protection circuit works by monitoring the voltage divider network that consists of R6110 R6103 R6104 and R6118 Essentially we can look at this as the voltage across R6118 since the voltage at IC6102 2 will change with it This resistor is ...

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Page 37: ...re OK move to the next step 5 We have unplugged all the connectors at this point that can be dis connected and have the set partially run We can run the set fully unloaded if we lower the AC voltage First fully unload the G board from the rest of the set by unplugging CN6102 CN6104 CN6105 and CN6106 Now supply 55VAC to the set and press the power button on the remote or the front panel The power r...

Page 38: ...and 3 19 Volts CN6105 3 15 Volts CN6102 7 and 8 19 Volts CN6105 4 15 Volts CN6104 2 15 Volts CN6105 12 22 Volts CN6104 4 and 5 7 Volts CN6106 1 135 Volts CN6104 7 11 Volts CN6106 3 135 Volts CN6104 9 33 Volts CN6106 5 15 Volts CN6105 1 22 Volts CN6106 6 15 Volts ...

Page 39: ... OCP XX B OVP detection LED blinks 3 times 3 B OVP XX V detection LED blinks 4 times 4 V STOP XX AKB detection LED blinks 5 times 5 AKB XX H detection LED blinks 6 times 6 H STOP XX HV abnormality detection LED blinks 7 times 7 HV XX Audio abnormality detection LED blinks 8 times 8 AUDIO XX XX the range of values for number of operations is 00 99 For 99 or higher there is no count up and the numbe...

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Page 41: ... They all output a HIGH when they are acti vated When a failure is received from one of the circuits it is stored in IC1007 NVM This can be helpful when problems are intermittent Keep in mind that failures might not always indicate the correct circuit For example if there is an intermittent HV failure the indication could be displayed as AKB failure In addition to sending a signal to the OSD proce...

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Page 43: ...he reset line is held LOW for some reason the set would appear to be completely dead X1001 and X1002 would continue to oscillate IC1008 38 and 39 are only active when Closed Caption is selected These pins are for CCD OSD horizontal positioning and will have a 12 MHz signal on them when closed captioning is ON IC1008 48 B Data and IC1008 50 B Clk would be HIGH with no activity on them You would nor...

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Page 45: ...D CPU 50 48 IC1007 NVM 6 5 M Main Bus The I C bus controls most of the set There is activity on it at all times when the set is powered ON Any IC on the bus could cause loading problems The following table shows which pins on each IC are on the bus If there is a loading problem these pins can be lifted from the IC to find the problem Connector or IC MSDA MSCL CN518 BM 15 14 CN521 Bus Connector 10 ...

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Page 47: ...e then input to IC1307 YUV Switch IC1307 YUV Switch switches between the main YUV signals and the YUV signal from Video 5 component input It also mixes in the Closed Caption Data from IC1008 Main CPU The CCD signal is input as a RGB signal and matrixed to be output as part of the main YUV signal The outputs from IC1307 YUV Switch are then input to the BR board DRC and the BM board MID The BR board...

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Page 49: ...ill never produce the main picture If a picture swap takes place when using PIP the tuners will be re tuned The main and sub tuner s video signals each pass through identical buffers before being input to IC515 A V Switch In addition au dio is input to IC515 A V Switch from each tuner The tuners are not re tuned for the audio swap function Outputs Main Video IC1008 Main CPU determines what input w...

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Page 51: ...e input to a differential amplifier that consists of Q1334 and Q1339 and their associated components While Q1334 B has the Y or composite signal input to it Q1339 B is set to a DC reference level of 3 9 volts The result of these inputs which is output at Q1339 C is that only the sync signals are amplified since they are below the threshold The signal leaving Q1339 C contains vertical and horizonta...

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Page 53: ...s 19 and 21 This type of processing re quires a great deal of memory since it must be capable of storing two full frames of video for the constant comparisons that are occurring One problem with a full 3D comb filter system is motion Motion in the picture between frames can cause some unwanted artifacts Therefore the 3D comb filter senses motion in the frames If no motion is detected then the line...

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Page 55: ... IC1304 Frame Memory to have data read from it by IC1306 3D Comb Filter This line is connected to IC1304 27 OE IC1304 Frame Memory is four Megs of EDO memory Since IC1304 Frame Memory is EDO type memory it needs to be refreshed constantly This is done using the RAS Row Address Strobe and CAS Column Address Strobe lines IC1306 10 MCAS outputs a CAS signal to IC1304 28 and 29 UCAS and LCAS IC1306 98...

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Page 57: ...adjusted with data from the I C circuit The Y circuit is then output at IC1305 18 Y Out The Y out signal is buffered by Q1321 and outputs its emitter to IC1307 1 H and V Sync When the Y signal leaves IC1307 22 Sel Y it is sent to Q1330 to be buffered This signal leaves Q1330 E to Q1331 B and Q1332 B Q1331 along with C1381 passes the Y signal It causes some roll off of the H sync pulse This signal ...

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Page 59: ...pending on which input is selected Which inputs are switched to the outputs depends on the state of IC1307 4 and 27 Output Selection The select pins at IC1307 4 and 27 are tied together and receive their input from Q1343 which outputs a HIGH or a LOW depending on the state of the FSC signal from IC1305 Main Chroma Decoder If any of the inputs except Video 5 component input are selected IC1307 4 an...

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Page 61: ...nes This technique of alternating odd and even fields is called interlacing The NTSC system is often referred to as 525 60 for 525 total scanning lines and 60 fields per second It is also called 480I for 480 net scanning lines interlaced Over the years the 480i system has worked remarkably well But with only 240 lines on screen at any one time the scanning lines can become painfully obvious partic...

Page 62: ...ason line doublers require elaborate motion detection motion compensation and memory circuits This can get expensive with the better line doublers costing 2 500 or more A new solution DRC Sony s new Digital Reality Creation DRC circuitry is an all new approach to the problem of visible scanning lines Not only does DRC create a clearer picture by doubling the number of active scanning lines it also...

Page 63: ... television viewing experience Now you can sit up close to the screen immersing yourself in the magic of home entertainment and still not be bothered by visible scanning lines Pictures appear denser and more seamless And in the coming world of Digital TV DTV broadcasting televisions with Digital Realty Creation circuitry will narrow the perceived gap among NTSC ana log sources standard definition ...

Page 64: ...56 NOTES ...

Page 65: ...nformation It also outputs a sync signal that is used to phase lock IC301 54 MHz Clock DRC Processing The 8 bits of Y and 8 bits of C are applied to IC462 Up Converter The Y signal is also applied to IC644 Memory This IC transfers data between IC645 Memory and IC462 Up Converter IC462 breaks the data into sev eral data streams and outputs them into IC463 Up Converter Two clocks 13 5MHz and a 27 MH...

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Page 67: ...DTV broadcasting embraces both interlace scanning and progressive scanning A convergence technology is needed to link the two previously separate worlds of entertainment and information Sony s solution Sony s new Multi Image Driver MID circuitry contains a special Twin View function that can display either a High Definition or a Standard Defi nition video signal together with any VGA source This i...

Page 68: ...uitry also delivers powerful picture in picture ad vantages such as Flexible Twin ViewTM Function Not only can you view two images side by side but you can continuously expand either picture up to two times its normal size Free layout Picture in Picture Instead of simply moving the PIP to pre determined spots you can use the remote joystick to manipulate it placing it anywhere on the screen Advanc...

Page 69: ...ally shows your eight favorites or the last eight channels you ve watched New Freeze Mode Lets you freeze a broadcast screen to write down a telephone number or website URL while the program continues as a side by side TwinView picture ...

Page 70: ...62 NOTES ...

Page 71: ...s the remote to enable PIP or Twin View func tions data is sent over the I2C bus for the MID CPU The MID CPU interprets these instructions and commands the MID Controller to pro duce the proper output The video output uses the two memory ICs to manipulate the signals to produce the desired outputs The MID CPU also uses the NVM to store the settings of its parameters These includes picture modes si...

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Page 73: ...rs These buffers are Q1012 Q1002 Q1001 and Q1003 The outputs are taken from their emitters and input to IC511 49 50 51 and 52 These signals are the YM YS and RGB signals for the OSD Video Outputs The video signals that are input are combined to form a picture that is output as R G and B signals from IC511 35 37 and 39 These signals are sent through buffers to CN701 which is connected to the CR boa...

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Page 75: ...o the output of the sync signals from IC511 Video Processor In addition to this the HBLK signal is applied to an OR circuit along with the VBLK and HS Out signals to the SCP pulse The SCP is called the sand castle pulse because of its shape The SCP pulse input to IC511 31 is used to time the clamping of the video signal ...

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Page 77: ... the micro that it is no longer in a busy state and unblank the set When IC511 unblanks the video it outputs RGB of approximately 2 Vp p from pins 35 37 and 39 If there is a problem the Timer LED will flash five times in accordance with the Self Diagnostic function As an ex ample if the red tube were drawing no current IC7101 5 would fall to about 2 volts This would cause the voltage at IC511 36 t...

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Page 79: ...d horizontal deflection circuits The VS signal is input to the BM board and IC512 VDSP This IC creates the vertical drive signal which is output to the Vertical Output IC on the D board Normally the vertical blanking signal would be created using the vertical boost pulse Although this circuitry exists it is not used since R684 is not mounted This is indicated by the symbol The VBLK signal is creat...

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Page 81: ... section to create the proper picture on the screen The horizontal block consists of the Horizontal Jungle Horizontal Drive and Output Pin Amp and HP H protect circuits High Voltage This set does not use the H Output to produce High Voltage It has its own output stage that amplifies the H Drive signal and applies that output to the FBT The FBT creates High Voltage Focus Voltage ABL Heater Voltages...

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Page 83: ...yokes so that more cur rent is delivered when the beam is sweeping the middle of the tubes A sample of the horizontal output signal is used by the HP H Protect to produce the HP signal The HP signal is fed back to the Horizontal Jungle to phase lock the Horizontal Drive and Horizontal Output The H Protect circuit uses the HP signal to detect proper operation of the horizontal circuits If a failure...

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Page 85: ... signal which is used to generate the AFC output IC507 2 AFC Input is a signal created by filtering the AFC signal with C526 R534 and C525 IC507 3 uses R550 and C550 to gen erate the pulse width of the phase shifting circuit inside of IC507 IC507 6 Filter 2 uses C543 to generate the comparison voltage which is compared to the sawtooth signal created by IC507 5 to create the output voltage at IC507...

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Page 87: ...5039 to charge This causes the beams to go from the right to the left side of the CRTs When C5039 is fully charged the magnetic field in the yokes will be dissipated causing C5039 to discharge through the yokes The remaining current required will flow through D5013 Damper This will cause the beam to move to its original position and the whole process begins again with the next H Drive pulse The pi...

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Page 89: ...e signal at Q5017 C to become more negative After the parabola has reached its negative peak it will begin to be more positive When this occurs less current flows through Q5012 C E and more flows through Q5017 C E This causes the signal at Q5017 C to become more positive This signal is applied to Q5018 B When the signal becomes more negative it causes current to flow through Q5020 E B junction and...

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Page 91: ...rom Q5015 B When the positive going pulse is input to Q5014 it turns the transistor OFF causing 6Vpp pulses to be present at Q5014 E This voltage comes from the 12 volt line through R5058 and Q5015 B E junction This pulse is applied to a peak detect circuit consisting of C5026 R5039 D5008 and C5020 As long as pulses continue to be applied to this peak detect circuit C5020 will hold a charge The vo...

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Page 93: ... The second output is the Odd Even pulse This signal is a 30Hz signal which is used by the OSD Processor and the BD board The VDSP circuit uses the VS and the H signal to produce four outputs The V Drive output is a sawtooth wave that is applied to the V Out circuit and then applied to the vertical yokes The VTIM output is the vertical timing pulse It is also called VBLK and is used to mute the vi...

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Page 95: ...nput is con nected to ground the output is of the OR gate will be HIGH whenever the input of pin 5 is LOW This signal is delayed by the time constant of R670 and C580 which are connected to IC517 2 C1 R1 This delayed signal is output at IC517 6 Q1 H and Odd Even The output from IC517 6 is input to two pins on IC508 H and Odd Even They are IC508 3 1Clk and IC508 12 2D Each of these inputs is for on...

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Page 97: ...th a symbol next to it If you see next to a component in a manual this means that this compo nent is not mounted on the board The other outputs from the CDP are input to the DSP section of IC512 DSP The DSP consists of an ALU multiplier RAM and ROM It uses the count information it receives from the CDP and its own internal program to gen erate the vertical deflection sawtooth the Pin or parabolic ...

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Page 99: ... R5067 and TH5001 also have an effect on the gain of the amplifier TH5001 is used for temperature compensation As the circuit operates the vertical yokes become hot and their resistance increases When this occurs R5067 and R5071 become hotter When they heat up the resistance of TH5001 is lowered because it is located in close proximity to these resistors This allows more current for the yokes so t...

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Page 101: ...High Voltage is regulated to keep brightness changes from causing changes in the size of the picture There are also two HV Stop circuits one that monitors the 12 135 and the tap from the High Voltage Block and another that monitors a tap from the FBT and the ABL signal Both of these circuits mute the H Drive circuit and alert IC1009 OSD Processor of a failure If there is a High Voltage Protect pro...

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Page 103: ...006 R8003 and C8004 This signal is input to Q8003 B amplified and output Q8003 C This signal is coupled through T8001 HDT to the HV Out transistor Peak Drive The peak drive of the HV Drive signal which was output from Q8003 C is controlled by a signal from the HV Regulation circuit The HV Regulation circuit inputs a PWM signal to R8024 R8024 and C8010 integrate this signal into a triangle wave Thi...

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Page 105: ...their secondary T8002 Low Output Transformer uses the winding across pins 15 and 17 to de velop the Heater voltages used by the picture tube filaments The pin 15 side of the winding is fused using circuit protector PS8001 This line also contains two current limiting resistors R8038 and R8039 The winding between pins 11 and 15 are used to develop 210 volts for the video drive ICs The voltage at T80...

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Page 107: ... R8201 set up the voltage to IC8007 10 R8201 may or may not be present in the set If it is it will be mounted on the post of CN8008 The High Voltage is adjusted for 31 KV at the factory It should be checked and adjusted according to page 57 of the service manual if parts are changed in the High Voltage circuit The voltages at IC8007 9 and 10 are used to determine the High Voltage They should be ne...

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Page 109: ... act as an integrator This causes the output at IC8008 7 to rise gradually because C8066 is in the feedback path of IC8008 The output rises like a sawtooth and is applied to IC8002 6 through R8096 The output continues to rise until the pulse at Q8022 B becomes HIGH When this occurs C8066 is short circuited by the C E junction of Q8022 causing IC8008 to become a buffer This causes the peak signal o...

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Page 111: ...21 is turned ON it shuts down the H Drive connected to the HV Drive circuit This shuts down the High Volt age Hold Down Hold Down means that the High Voltage is shut down when the it exceeds a certain level That level is 34 KV in this set This is done by inputting the output of T8003 6 to a peak hold circuit consisting of D8032 and C8077 C8077 charges to hold the peak voltage present at D8032 C Th...

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Page 113: ...t shuts down the H Drive connected to the HV Drive circuit This shuts down the High Voltage High Voltage Block Tap IC8008 3 receives input IC8007 1 which is the buffer for the High Voltage Block tap It has the same voltage as the tap This voltage is compared to a reference of 9 3 volts input at IC8007 2 and produces an output of 12 volts at IC8008 1 If the voltage at IC8008 3 rises above 9 3 volts...

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Page 115: ...e P Bus to an IC which outputs the correct waveforms These waveforms are output to the Sub Deflection amplifiers and applied to the sub yokes Auto Focus Auto Registration The Auto Focus button on the front of the set allows the customer to adjust the skew and centering of the three colors at the touch of a button When Auto Focus is selected the PJED OSD sends out signals which are sent through a l...

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Page 117: ...the system does not pick a new optimum value when the customer uses it but rather changes centering and skew adjustment data to get an optimum sensor reading The drawing below shows the position of the sensors around the screen 5 3 0 2 7 4 1 6 SCREEN 0 UPPER SENSOR 1 LEFT SENSOR 2 RIGHT SENSOR 3 LOWER SENSOR 4 UL SENSOR 5 UR SENSOR 6 LL SENSOR 7 LR SENSOR When Auto Focus button is pressed Pattern ...

Page 118: ...ses the Auto Focus button the system will change the convergence data to receive the optimum value at the A D converter 250 1000 900 800 700 600 500 400 300 200 100 0 0 10 20 30 40 50 60 200 150 100 50 0 A A A B B 0 5mm BV CENT mes ratio A D data mes_data0 mes_data1 mes_rati main YES YES NO NO Initial settings H SIZE enlargement Dark current measurement G VCENT alignment SKEW measurement R VCENT V...

Page 119: ...TEP ADJUST Measure 4V 4V Measure 4V 4V Did CENT SKEW measurement exceed center point 4STEP change in CENT SKEW Did CENT measurement exceed center point 1STEP change in CENT Did SKEW measurement exceed center point 1STEP change in SKEW The flowchart below left shows the steps taken during the adjustment portion of the previous flowchart As these adjustments are performed the convergence data values...

Page 120: ...0 Sensor Output Level Low Check wiring beam position sensor 20 Sensor Output Level High Check OP amp circuit 30 Adjustment Loop Counter Overflow 0 CENT V 1 CENT H 2 SKEW V 3 SKEW H 40 Regi Data Overflow Same as Loop Counter Overflow 50 Regi Data Overflow Same as Loop Counter Overflow 60 Offset Overflow Same as Loop Counter Overflow Check beam position If need adjust PWM2 for H error V CENT main fo...

Page 121: ...nsistors Q1609 through Q1616 To ensure precise measurements each sensor also has its own reset line that grounds the peak hold circuit every vertical blanking pulse The top left right and bottom sensors outputs are applied directly to the BD board The four corner sensors are applied to a switch The switch is necessary because the PJED CPU only has six A D inputs Since we do not need to use the cor...

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Page 123: ...nging the skew data tilts the picture on its vertical or horizon tal axis Size The effect of the horizontal size control is to change the box width from the center outwards Linearity The linearity control changes the linearity or the width of the boxes on the left side of center as compared to the right While changing the linearity control if the box width on the right side were getting smaller th...

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Page 125: ...ut to IC1702 2 IC1702 is a filter amplifier outputs the RH signal to CN523 on the A board The Green Vertical Output is input to IC714 14 RSI and IC720 14 RSI The analog signals are output from pin 6 of each of these ICs They are combined and input to IC1708 2 IC1708 is a filter amplifier which outputs the GV signal to CN523 on the A board The Green Horizontal Output is input to IC714 15 LSI and IC...

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Page 127: ...o the D board This LOW is applied to the base of Q5024 keeping it OFF If Q5024 is OFF then Q5025 and Q5027 are also OFF This causes IC5005 12 and 13 Mute to be 0 volts This will mute IC5005 and it will not output any signals After three seconds the Regi Mute output will go HIGH This causes Q5024 to turn ON This will cause Q5025 and Q5027 to turn ON This places 19 volts on IC5005 12 and 13 which en...

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Page 129: ...ers the test mode you will notice that the letters indicating the service adjustments have changed from green to white and the following will appear on the screen PJED 000 000 FDIS Remote Functions The PJED mode is for adjusting convergence When this display ap pears you have entered into the registration adjustment section The buttons on the remote will no longer perform the same functions but wi...

Page 130: ...TITION LEFT RIGHT ZOOM IN FREEZE POWER SYSTEM OFF DVD VTR DBS CABLE FUNCTION DVD VTR DBS CABLE TV CC ADJUST BUTTONS AND INDICATOR MUTING DISPLAY Adjustment item up Adjustment item down TV POWER ON Data up Change Color Data down Test Pattern Category down Mode select Rough adjustment Fine adjustment ENTER PJED data up down Category up ...

Page 131: ...the other two colors so it must be correctly ad justed first Press 6 on the remote so that a crosshatch can be seen over a black screen If the V Size H Size V Pos and H Pos are not correct use the 2 button to enter the VDSP category and make the necessary changes to those adjustments If these adjustments are correct then you can do the coarse adjustments for green There are two sets of adjustments...

Page 132: ...w controls for each color so that it matches what was previously memorized The factory or the servicer sets the memorized information by pressing the Auto Focus button while in the test mode Therefore whenever a servicer adjusts convergence they should press the Auto Focus button after and only after they have a perfect picture Generally this would be the last thing done before finishing the repai...

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Page 135: ...B OCP XX B OVP detection LED blinks 3 times 3 B OVP XX V detection LED blinks 4 times 4 V STOP XX AKB detection LED blinks 5 times 5 AKB XX H detection LED blinks 6 times 6 H STOP XX HV abnormality detection LED blinks 7 times 7 HV XX Audio abnormality detection LED blinks 8 times 8 AUDIO XX XX the range of values for number of operations is 00 99 For 99 or higher there is no count up and the numb...

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Page 137: ...s They all output a HIGH when they are acti vated When a failure is received from one of the circuits it is stored in IC1007 NVM This can be helpful when problems are intermittent Keep in mind that failures might not always indicate the correct circuit For example if there is an intermittent HV failure the indication could be displayed as AKB failure In addition to sending a signal to the OSD proc...

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Page 139: ...131 S SEL Service Company A Division of Sony Electronics Inc 1 Sony Drive Park Ridge New Jersey 07656 TVP080199 Printed in U S A ...

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