Service Manuals, User Guides, Schematic Diagrams or docs for : RCA LCD RCA_BD20TF10_F19426_F19436_F20TF10_TVD809_Video_block_[SM]

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RCA_BD20TF10_F19426_F19436_F20TF10_TVD809_Video_block_[SM]


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                                                                    I2C2
                                Tuner
                    ANT                                       Clk           Dat
                                                                    11 10     OSD
                                                     IF                    from SysCon
                     Dat
                I2C2                                      1/2 Sound/Pix IF    IG401
                     Clk                                         II60
        Rear (CV)
        Video                                                        17
                                 4   2                                            15 16 17      To
                                                    Video (CV)                                  CRT
                          6                7
         Y                     Video                                             Video/   19      R
                                Input         Y-Out                            Deflection 20
         C                5                17                               43 Processing         G
                               Switch         C-Out                                       21      B
       (CV) Front         10               16                               45    IV01
            Video                IV02
                                                          Video (CV)                  Dat 28
                          15               18
                                                                                                I2C2
                               Y-In C-In
                                                                                       Clk 27
          CC Video              20 11
         to SysCon                               Chroma           Luma
            IG401                               Buff/Filter     Buff/Filter
                                                 TV523          TV522/526


          TX809 Video Switching/Processing Block Diagram

Video Switching & Processing

The Video Switching and Processing circuitry in the TX809 includes the Video
Input Switch IV02, the Video/Deflection Processing IC IV01, the Sound/Pix IF IC
II60 and the tuner. The video switch IV02, video/deflection IC IV01 processor
and the sound/pix IC II60 are controlled via the System Control IG401. The CC
Video (Closed Caption) is output from pin 15 of switch IV02 and sent to the
system control (IG401) for decoding. Transistors TV522, TV523 and TV526 are
used to separate the composite video signals into separate luma (Y) and chroma
(C) signals. The composite video (CV) from the Sound/Pix IF (II60) and the front
and rear input jacks are first routed through IV02 and output at pin 18. The
composite video is applied to chroma and luma filter circuits for separation. The
separated Y & C are then input back into IV01 at pins 11 and 20. The Y/C (S-
Video) input is routed directly through switch IV02 for final processing. The
selected video is output at pin 16 and 17 and applied to pins 43 and 45 of IV01
for final processing. All brightness, contrast, color and tint adjustments are
performed by the video processor (IV01). The RGB OSD (On-Screen-Display)
from the system control IG401 is also input to the video processor at pins 15, 16
& 17.

Troubleshooting

NOTE: Always use known video source such as color bars. If a video problem
is suspected perform the following:

1.   Confirm presence of all power supplies for circuit.
2.   Check I2C2 for data & clock activity when a function is selected.
3.   Check for video from II60-17 (Sound/Pix IF) during tuner operation.
4.   Apply video to front/rear video inputs and check for video at IV01-18.
5.   If OK, check for Y & C out of transistors TV522, TV523 & TV526.
6.   If OK, check for Y & C at IV02-16/17.
7.   Check for correct RGB out of IV01-19/20/21 (Video Processor).



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