Service Manuals, User Guides, Schematic Diagrams or docs for : RCA LCD RCA_BD20TF10_F19426_F19436_F20TF10_TVD809_Overview_block_[SM]

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RCA_BD20TF10_F19426_F19436_F20TF10_TVD809_Overview_block_[SM]


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                                                       Rear Audio In
                                             Front Audio In                       L/R       Audio
                                 IF                           L/R                 2       Compress
                Tuner                     Sound/Pix IF              2                       IA001
   ANT                                       II60
                                                                     Stereo Demux         L/R
          Dat                                             WB           & Tone/Vol                        Ext Spkr
  I2C2                                                   Audio            IA002            2
          Clk                                                                                           Amp IA502
       Rear
       Video                     Video                                                         SysCon          2 L/R
                Video                                                             2             IG401
   Y             Input                                              Clk Dat
                                                                                                            To Ext
   C            Switch                                                I2C2
                                                                                   L/R                      Spkrs
                  IV02                     Video/           R
                          Y/C 2                               To                             L/R
                                         Deflection                            Int Spkr            To Int
   Front                                                    G CRT
    Vid         CC                       Processing                           Amp IA003        2   Spkrs
                Vid      RGB                IV01            B
IR In                    OSD 3                                                               L/R      To
                                                                                               2     Head
                                                                                      To            Phones
                                                 V-Out           Vert Ouput
         Gemstar                         Dat                                          Vert
         SysCon           I2C2                                      IF01
                                                                                      Yoke
        m C IG401                        Clk     H-Out
                                                                                                        Raw B+
                                                                   Horz Ouput                                     Run
                                               Dat 2                  TL02                                      Supplies
   Dat            Clk                              I C2
                                               Clk
          I2C1
         EEPROM                                                                          Horz
                                                  Audio Mute                             Yoke           IHVT
           IR01              Bus Exp
                                                  AC Degauss         Stdby Power                        LL05
                              IR501
                                                  VC                 Supply TP20
         Keyboard

                                                            120VAC

                           TX809 Simplified Block Diagram

TX809 Chassis Overview

The TX809 is a conventional NTSC analog color television chassis that
incorporates many of the latest video features. The TX809 has both front and
rear composite video (CV) and audio inputs. The chassis also features a rear
Y/C (S-Video) input that provides maximum quality video reproduction. The
Sound/Pix IF IC (II60) provides the composite video signal. The video/deflection
processing IC (IV01) is responsible for final processing of the video signal. The
RGB OSD (on-screen-display) is also input to IV01 and overlaid onto the video
signal. IV01 also provides contrast, brightness, tint and color controls.

The TX809 system control microcomputer IG401 is located in the Gemstar
module and controls and monitors the operation of the instrument via two (2) I2C
buss. The I2C1 bus reads and writes operational data (customer and factory
settings, etc.) to and from the EEPROM, IR01. The second bus (I2C2) provides
control to all other areas of the chassis. The system control micro also monitors
the keyboard and decodes the IR input from the remote control. The I2C2 bus is
also applied to the bus expander IR501 where additional control signals for the
chassis is generated.

The Sound/Pix IF IC (II60) provides the wide band audio signal. The audio circuit
consists of four (4) major IC's, they are the stereo Decoder/Demultiplexor IC
(IA002), an internal and external power amplifer IC's (IA502 / IA003) and the
audio compressor (IA001). The Audio Compressor generates a control signal
that is fed back to the system control micro to limit severe and sudden unwanted
audio level changes.
                                                       Rear Audio In
                                             Front Audio In                       L/R       Audio
                                 IF                           L/R                 2       Compress
                Tuner                     Sound/Pix IF              2                       IA001
   ANT                                       II60
                                                                     Stereo Demux         L/R
          Dat                                             WB           & Tone/Vol                        Ext Spkr
  I2C2                                                   Audio            IA002            2
          Clk                                                                                           Amp IA502
       Rear
       Video                     Video                                                         SysCon          2 L/R
                Video                                                             2             IG401
   Y             Input                                              Clk Dat
                                                                                                          To Ext
   C            Switch                                                I2C2
                                                                                   L/R                    Spkrs
                  IV02                     Video/           R
                          Y/C 2                               To                             L/R To Int
                                         Deflection                            Int Spkr
   Front                                                    G CRT
    Vid         CC                       Processing                           Amp IA003       2 Spkrs
                Vid      RGB                IV01            B
IR In                    OSD 3                                                               L/R    To
                                                                                               2    Head
                                                                                      To           Phones
                                                 V-Out           Vert Ouput
         Gemstar                         Dat                                          Vert
         SysCon           I2C2                                      IF01
                                                                                      Yoke
        m C IG401                        Clk     H-Out
                                                                                                        Raw B+
                                                                   Horz Ouput                                    Run
                                               Dat 2                  TL02                                     Supplies
   Dat            Clk                              I C2
                                               Clk
          I2C1
         EEPROM                                                                          Horz
                                                  Audio Mute                             Yoke           IHVT
           IR01              Bus Exp
                                                  AC Degauss         Stdby Power                        LL05
                              IR501
                                                  VC                 Supply TP20
         Keyboard

                                                            120VAC

                          TX809 Simplified Block Diagram


The standby power supply is a conventional switch mode power supply. The
standby supply is on whenever the instrument is plugged into 120VAC. The run
supplies are only on when the set is running and are generated via a
conventional horizontal scan-derived configuration. The voltages developed by
both the standby and run supplies can vary depending upon the model and it's
features. The video/deflection processing IC (IV01) also generates both the
horizontal and vertical drive signals that are applied to the vertical and horizontal
drive circuits.



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