Philips EM7U LCOS Service Manual
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Philips EM7U LCOS Service Manual

Philips EM7U LCOS Service Manual

Liquid crystal on silicon rear projection tv
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PHILIPS SERVICE AND QUALITY/TRAINING
LIQUID CRYSTAL ON SILICON
EM7U LCOS REAR PROJECTION TV
PHILIPS SERVICE AND QUALITY/TRAINING
P H I L I P S
ONE PHILIPS DRIVE
TECH
PO BOX 14810
KNOXVILLE, TN
PHONE: 865-521-4397
VIDEOTAP E S
FAX: 865-521-4818
M A N U A L S
EMAIL: TECHNICAL.TRAINING@PHILIPS.COM
LCOS
37914-1810

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  • Page 1 PHILIPS SERVICE AND QUALITY/TRAINING LCOS LIQUID CRYSTAL ON SILICON EM7U LCOS REAR PROJECTION TV PHILIPS SERVICE AND QUALITY/TRAINING P H I L I P S ONE PHILIPS DRIVE TECH PO BOX 14810 KNOXVILLE, TN 37914-1810 PHONE: 865-521-4397 VIDEOTAP E S...

  • Page 3: Table Of Contents

    Table of Contents Introduction ............1 Set Operation .

  • Page 4: Introduction

    INTRODUCTION The EM7U chassis is designated for release in the 2003 model year. This is a rear projector based on LCOS (Liquid Crystal on Silicon) technology. LCOS is a reflective LCD technology. The light source is an ARC projection lamp that is replaceable by the customer. This projec- tor is lighter and more compact that comparable size projection sets using tubes.

  • Page 5: Set Operation

    SET OPERATION The set has three 1H or NTSC only inputs. They are AV1 and AV2 located on the rear Jack Panel. The third input is the Side Jack panel. AV3 and AV4 can be either 1H NTSC, 480P, or 1080I signals. These signals must be in the Y Pb Pr format. AV5 is a DB15 RBG input. AV6 is a DVI 1080I input connector.

  • Page 6: Remote Control

    Remote Control Figure 1 When the set is turned On via the Keyboard or Remote Control, the set will take approximately 30 seconds to display a picture. By using the Select button, the Remote can be used to control other devices. A list of setup codes for other devices is located in the customer's operator’s manual.

  • Page 7: Picture Formats

    Picture Formats There are seven different Picture Formats: Super Zoom, Panoramic, 4:3, Movie Expand 14:9, Movie expand 16:9, 16:9 Subtitle, or Wide screen, which can be selected by the cus- tomer. (Figure 5) When portions of the picture are deleted, the cursor buttons on the Remote can shift the picture to select the area to be deleted.
  • Page 8 Under the Channels title, is the channel guide lock selection. (Figure 13) The customer can lock out selected channels or channels that are transmitting a selected rating code. These channels can only be view when the code selected by the cus- tomer is entered.

  • Page 9: Reflective Lcd Projection System

    REFLECTIVE LCD PROJECTION SYSTEM The LCOS (Liquid Crystal on Silicon) uses a reflective LCD system. A single reflective LCD panel with multiple LCD cells is used. Since a single panel is used, it is necessary to scan the panel with the primary colors to obtain a color picture.
  • Page 10 The Philips LCOS projector uses a single LCD device. To obtain a color picture, the LCD is scanned with strips of Red, Green, and Blue light. The strips of color are developed by split- ting the light from the Lamp and directing it to three color filters which produce Red, Green, and Blue light.

  • Page 11: Power Supply Block

    POWER SUPPLY BLOCK (Figure 21) The Bridge Rectifiers, On/Off Relay, Audio Power supply, and Lamp supply are located on the Power Input board. The Standby and Main supplies are located on the Main Power board. AC is applied to the Power Input Board via connector 1212. This voltage is rectified to pro- duce the RAWDC-STBY and is fed to the Main Power Board.
  • Page 12 POWER INPUT BOARD MAIN POWER BOARD POWER BOARD SERVICE POSITION Page 9...

  • Page 15: Standby Supply

    STANDBY SUPPLY (Figure 23) The Standby supply is located on the Main Power board. It provides the +5VSTBY supply to the set whenever power is applied. When power is first applied, the RAWDC_STBY is applied to the primary winding of 5210 and to Pin 7 of 7202.

  • Page 17: Main Power Supply

    MAIN POWER SUPPLY (Figure 24) Power is applied to the Main Power supply when the set is turned On. The RAW-DC is switched to the Main Power supply located on the Main Power supply board. Voltage is applied to the Primary winding of 5310 via Pins 5 and 3. Voltage is then applied to Pin 7 of 7302.

  • Page 19: Volt Regulator

    3.3 VOLT REGULATOR (Figure 25) IC 7307 and transistor 7308 make up the 3.3-volt regulator located on the Main Power Supply board. When the Oscillator in 7307 goes Low, the flip-flop is reset causing Q to go Low and the output to go High. When the Feedback voltage on Pin 5 is below 1.25 volts, the comparator outputs a High.

  • Page 21: Audio Power Supply

    AUDIO POWER SUPPLY (Figure 26) The Audio supply produces a plus and minus 23 volts. This supply is located on the Power Input board. The Audio supply also produces the CONTROL-VOLTAGE or operating voltage for the Lamp supply. RAW-DC voltage is applied to the Audio Power supply circuit when the set is turned On. This voltage is applied to primary windings, Pins 5 and 3, of Transformer 5410.
  • Page 22 OPERATING VOLTAGE FOR THE LAMP SUPPLY REGULATOR...

  • Page 23: Lamp Supply

    LAMP SUPPLY (Figure 27) The Projection requires a minimum of 330 volts to operate. To ensure that sufficient voltage is present, a Boost Regulator is used. A Boost Regulator has a higher output voltage than the input voltage. The Lamp supply is located on the Power Input board. RAW-DC-LAMP is applied to the Boost circuit via Fuse 1511.

  • Page 25: Video Signal Flow Block

    VIDEO SIGNAL FLOW BLOCK (Figure 28) The LCOS projector has three sections:the 1FH NTSC processing, Scaler HD Processing, and the Light Engine. The 1FH NTSC section has three video inputs, AV1, AV2, and Side, which are for NTSC composite video only. This section has Line Doubling, Pixel Plus, and Picture in Picture func- tions.

  • Page 26: Overall Block 1Fh Section

    FIGURE 29 - OVERALL BLOCK 1FH SECTION (Figure 29) The inputs for the 1FH section are for NTSC signals only. The Side Jack panel can accept either composite video or SVHS video. The Composite video or YC from the Side Jack Panel is fed to the Jack Panel.

  • Page 28: Side Jack Panel

    SIDE JACK PANEL (Figure 30) The Side Jack panel can have either a composite or SVHS input. When a connector is inserted into the SVHS input, the composite input is disconnected. Zener diodes are con- nected to both the Y/composite and the C lines to limit the applied voltage to 7.4 volts. A 75- ohm resistor on both lines provides the correct impedance matching.

  • Page 29: Av1 Input

    AV1 INPUT (Figure 31) The AV1 and AV2 inputs are located on the Jack panel. Composite video for AV1 is input to connector 1251 and then to an impedance matching network consisting of resistors 3248 and 3182. Diode array 6126 prevents the incoming signal from exceeding 9.6 volts in the positive direction and 0.6 volts in the negative direction.

  • Page 30: Component Input

    1H COMPONENT INPUT (Figure 32) The 1FH Y Pb Pr inputs are located on the Jack panel. The 1H Y Pb Pr inputs all have an impedance matching resistor and clamping circuit. As with the composite and SVHS inputs, the input signal is clamped to be no more that 0.6 volts above the +Vp supply in the positive direction and no more than 0.6 volts in the negative direction.

  • Page 31: 1Fh Jack Panel Switching

    1FH JACK PANEL SWITCHING (Figure 33) The switching for the composite and SVHS signals is performed by IC 7100, located on the Jack panel. IC 7100 is controlled by the SDA_EMG and SCL_EMG bus that comes from the OTC (main Microprocessor) located on the SSB. The Y signal from the Y Pb Pr input is fed to Pin 5, where it is switched to the System board and the SSB.

  • Page 32: Main Tuner

    MAIN TUNER (Figure 34) The Main tuner is located on the System board. The IF output from this Tuner is fed to the SSB for processing. The 36-volt supply from the Main Power supply board supplies the tun- ing voltage. This voltage is regulated by Zener diode 6112 and Shunt Regulator 7115 to pro- duce 33 volts.

  • Page 33: Hip (High-End Input Processor) Circuit

    HIP (High end Input Processor) CIRCUIT (Figure 35) The IF from the Main Tuner and selected composite or SVHS signals is fed to the HIP IC 7323 located on the SSB. This IC is controlled by the SDA-F and SCL-F, fast bus, from the OTC (Microprocessor) located on the SSB.

  • Page 35: Ntsc Comb Filter Circuit

    NTSC COMB FILTER CIRCUIT (Figure 36) The Comb Filter circuit separates the Chrominance and Luminance, YC, from the composite video. This is a separate PC board that plugs into the System board. The video signal is amplified by Transistors 7008 and 7009. Transistors 7010, 7015, 7016, and 7017 separate the Sync from the composite video.

  • Page 37: Pip/Double Window Input

    PIP/DOUBLE WINDOW INPUT (Figure 37) The PIP/Double Window panel allows for both a standard PIP window and a split screen. The PIP/Double Window module has a separate Tuner, SAW filter, and Signal Processor. The output of the Signal Processor, 7301, on Pin 16 is fed to switching IC 7402 that selects between the PIP Tuner and Composite Video from the SSB.

  • Page 41: Feature Box

    FEATURE BOX (Figure 40) The circuit located on the SSB, labeled the Feature Box, performs the digitizing, line doubling, and picture resizing. The main functions are performed by 7611, PICNIC (PICture improve- ment Network IC), and 7718, FALCONIC (Field And Line COnverter and Noise reduction IC). The PICNIC IC performs the A/D Analog-to-Digital, conversion while the FALCONIC performs the Line Doubling.
  • Page 42 USED...

  • Page 43: Eagle

    EAGLE (Figure 41) The Eagle circuit provides Skin tone correction, Blue stretch, and Green Enhancement. In versions equipped with the Pixel Plus feature, the Eagle IC performs the corrections for this mode. The video frames are sent to FM4 and FM5, 7722, and 7723 memories from the FALCONIC IC.

  • Page 45: Lvds Transmitter

    LVDS TRANSMITTER (Figure 42) The 8-bit digital Y and UV signal is fed to the LVDS (Low Voltage Differential Signaling) Transmitter, 7100. IC 7100 converts the parallel 16-bit signal to a serial data output. The output of the LVDS is held at 345mV to prevent RFI (Radio Frequency Interference). There are four data pairs and one clock pair.

  • Page 46: Section Block

    2H SECTION BLOCK (Figure 43) The 2FH processing section is located on the MSB (Main Scaler Board). Signal is fed to this board via the SSB via the LVDS line, VGA connector, DVI connector, or the 2H Component inputs. The serial LVDS data is decoded back into Y 8-bit and UV 8-bit parallel data. This data is fed to the Scaler IC.
  • Page 48 VGA INPUT (Figure 44) RGB is fed to the set via AV5 using a DB15 connector. IC 7633 is loaded with the possible settings that are read by the computer when it is connected. Some of the possible inputs to AV5 are VGA (640x480), SVGA (800x600), XGA (1024x768), SXGA (1280x1024), HD60p (1280x720), W-VGA (848x480), and W-XGA (1368x768).

  • Page 50: Av3 And Av4 Inputs

    AV3 AND AV4 INPUTS (Figure 45) The AV3 and AV4 inputs allow the input of Component Y Pb Pr signals from a 1080I, 480p, or NTSC source. Better results are obtained by inserting the NTSC Component source into AV2. Each of the AV3 and AV4 inputs are clamped to limit the level of the signals applied. This is accomplished by using diode arrays, 6711, 6710, 6712, 6632, 6631, and 6630.

  • Page 52: Analog Input A/D Conversion

    ANALOG INPUT A/D CONVERSION (Figure 46) The selected Y Pb Pr signal and the RGB signals from the VGA connector are fed to IC 7345. IC 7345 converts the signals from Analog to Digital. There are two triple 8-bit lines. The GRO, GBO, and GGO lines carry the Odd field data while the GRE, GBE, and GGE lines carry the Even field data.
  • Page 53 DVI INPUT (Figure 47) AV6 is the DVI (Digital Video Interface) input. This type interface is used on some computer video cards and Set Top boxes. This is digital transmission based on the TMDS (Transition- Minimized Differential-Signaling) format. The TMDS system provides a high-speed reduced RFI (Radio Frequency Interference) transmission system.
  • Page 55 LVDS RECEIVER (Figure 48) Picture data from the SSB is transmitted to the MSB (Main Scaler Board) via the LVDS (Low Voltage transmission system) to IC 7537. The LVDS receiver has four data lines and one clock line. The IC is switched On or Off by the Scaler IC via the LVDS_PWR_DOWN_n line connected to Pin 25.
  • Page 56 SCALER (Figure 49) IC 7407 is a highly integrated system on a chip that interfaces the YUV signal from the SSB, the DVI interface, or the Analog HD inputs to the 1280x720 Light Engine. The Scaler, 7407, is a 352 Pin Ball Grid array device. Video Data from the Eagle for the NTSC signal is already scaled correctly in the Eagle.
  • Page 58 OSD AND OUTPUT CIRCUIT (Figure 50) The SCR_RED, SCR_GREEN, and SCR_BLUE data is sent to the PLD (Programmed Logic Device). The PLD inserts the digitized OSD information onto the video information. The sig- nal from the PLD is output to the TMDS transmitter and then to the Light Engine. The OSD information from the OTC on the SSB is in an Analog format.

  • Page 62: Reference Voltage And A/D Converters

    REFERENCE VOLTAGE AND A/D CONVERTERS (Figure 53) The BLEND_FDB signals are fed to a resistor matrix to set the DC reference voltage for the A/D converters. The signals are buffered by Transistors 7189 and 7188 to add bias to the Analog FBL_OSD signal.

  • Page 66: Light Engine Block

    TMDS TRANSMITTER (Figure 56) The three 8-bit video data lines, OSD_RED, OSD_GREEN, and OSD_BLUE are fed to the TMDS Transmitter, 7295. IC 7295 converts the Parallel data into DVI formatted serial data lines to drive the Light Engine. Data and Sync are output on TX0. TX1 and TX2 are encod- ed with video data.
  • Page 70 AUDIO SIGNAL FLOW BLOCK (Figure 59) The LCOS projector has a two-channel, 20 watt per channel, audio system. The Picture and Audio source can be selected from any one of seven inputs. The AV inputs are located on the Jack Panel, Scaler board, or Front Jack panel. The Audio processing for the Tuner is located on the SSB.
  • Page 72 SSB AUDIO PROCESSING (Figure 60) Audio processing is performed by IC 7651, located on the SSB (Small Signal Board). Baseband audio is fed to the signal processor on Pin 50. R-SC1_AV1-IN, L-SC1_AV1-IN, R- SC2_AV2-IN, and L-SC2_AV2-IN are fed to the IC on Pins 44, 45, 41, and 42. PIP audio from the PIP/DW board is input on Pin 47.

  • Page 74: Audio Signal Delay

    AUDIO SIGNAL DELAY (Figure 61) The delay circuit for the Audio is located on the System board. The clock signal from I S bus is fed to two 8-bit counters. The output of these counters addresses a RAM IC, 7103. Data from the Audio processor is fed to Pin 2 and is output on Pin 19.
  • Page 76 POWER ON MUTING (Figure 62) During power up, when the set is turned On, the MON output and the Subwoofer output are muted momentarily to prevent turn on noise in any external amplifiers. When the set is turned On, Transistor 7675-A is turned On by the +5.2 volt supply via Resistor 3524. This turns Transistor 7668 On, which turns On Transistors 7678A, 7678B, and 7677.

  • Page 77: Audio Power Amplifier

    AUDIO POWER AMPLIFIER (Figure 63) The Audio Power amplifier is located on a board behind the System board. The Amplifier outputs 20 watts per channel. This is a class D amplifier. The signal is applied to the Amplifier on Pins 3 and 1 of connector 1700. The signal is applied to Pins 10 and 18 of IC 7700.

  • Page 79: Audio Protection Circuit

    CENTER CHANNEL SWITCH (Figure 64) When the Center Channel switch is in the internal position, the Left and Right audio output is fed to the internal speakers. When it is placed in the External position, the internal speakers are connected in series with the input jack, 1000. In the case where the Customer has a sep- arate sound system, this switch allows the speakers in the set to be used as the center out- put.

  • Page 81: Headphone Switch And Amplifier

    HEADPHONE SWITCH AND AMPLIFIER (Figure 66) The Headphone Amplifier circuit is located on the System board. AV1 audio or Headphone audio selected by the Audio processor is applied to IC 7116. The volume for the Headphones is controlled by IC 7116. This IC is controlled by the SDA and SCL line's I C bus from the OTC...
  • Page 82 OTC MICROPROCESSOR BLOCK (Figure 67) The OTC (On-screen display Text Control) is located on the SSB. This is the main Microprocessor for the set. The User communicates with the OTC via the Keyboard or Remote Control. It communicates with the rest of the set via a dual I C bus.

  • Page 83: Otc Communication

    OTC COMMUNICATION (Figure 68) The Keyboard is connected to the OTC via the Sensor board and System board to Pin 107. The Standby line on Pin 104 goes Low when the set is turned On. It also turns On the Standby LED.

  • Page 85: Light Sensor

    KEYBOARD (Figure 69) The Keyboard is located at the top of the set's cabinet. The resistors connected to each switch cause a different voltage to be applied to the Keyboard line when pressed. A LED is mounted under the Standby switch. FIGURE 69 - KEYBOARD LIGHT SENSOR (Figure 70) The Light Sensor, 6004, is amplified by two op amps, 7001 and 7000.

  • Page 86: C Interconnect - Part One

    LED CIRCUIT (Figure 71) LED 6000 is a Red and Green LED in a common housing. When both are turned On, the color changes to Orange. In the Standby mode, the Standby line is High turning transistor 7001 On, turning the Green LED Off. When the set is turned On, the Standby line goes Low and the ON_OFF_LED line goes High.

  • Page 88: C Interconnect Part Two

    C INTERCONNECT PART TWO (Figure 73) The PIP/DW panel has five devices that are controlled by the OTC via the I C bus. FIGURE 73 - I C INTERCONNECT PART TWO C INTERCONNECT PART THREE (Figure 74) The MSB has two Microprocessors, 7101 and 7407. The PLD (Programmed Logic Device) mixes the digital OSD from the OTC with the digital video signal from the Pixelworks IC, 7407.

  • Page 90: Fan Drive Circuit

    FAN DRIVE The Fan cools the Light Engine while the set is in operation. A sensing circuit increases the speed of the Fan if the temperature increases and decreases the speed as the temperature drops. There are two fans that are mounted on the Light Engine. The Sensor Board is located on the bottom of the set’s cabinet.
  • Page 91 The voltage represents the ambient temperature of the set from the Sensor Board which is fed to the System Board via connector 1262. (Figure 76) The voltage is fed to the positive input of IC 7110. This IC converts the voltage into an 8-bit data signal which is fed to the System Microprocessor, 7108.

  • Page 97: Disassembly

    DISASSEMBLY Number 10 Torx and #20 Torx are required for disassembly. MIRROR PROTECTIVE SCREEN PROJECTION SCREEN SMALL SIGNAL ELECTRONICS LIGHT ENGINE MOUNT POWER SUPPLIES EXPLODED VIEW Page 94...
  • Page 98 REMOVE SCREWS FROM THE SERVICE COVER THEN PULL THE COVER AWAY FROM THE SET A FEW INCHES UNPLUG THE CENTER CHANNEL AMP SWITCH Page 95...
  • Page 99 UNPLUG THE SIDE JACK PANEL YOU MAY NOW SET THE REAR COVER ASIDE TO SERVICE THE SMALL SIGNAL ELECTRONICS PACKAGE, FIRST REMOVE THE MOUNTING SCREWS Page 96...
  • Page 100 THEN SLIDE THE PACKAGE OUT OF THE SET POWER INPUT BOARD IN A SERVICE POSITION Page 97...
  • Page 101 TO SERVICE THE BOARDS IN THE SMALL SIGNAL SECTION, IT IS NECESSARY TO REMOVE THE REAR COVER TO THIS SECTION. SCALER AND JACK PANEL EXTENDER BOARD Page 98...
  • Page 102 PIP/DW SCALER BOARD (MSB) JACK PANEL COMB FILTER SYSTEM B O A R D SMALL SIGNAL BOARD (SSB)
  • Page 104 MICKIE MARTIN 05/05/03...

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