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Field sync and output circuit
Field sync seperator produces field sync signals from compound sync signals and
activates the field frequency splitting system. When a certain number field sync
pulse is detected, the field frequency spliting system will start operation for
frequency spliting of the multiple line frequency signals generated by the line
frequency oscilator. The field pulse gained from frequency spliting will be sent to
field sawtooth generator for sawtooth waves, and then transmitted by pin 23. The
output circuit of this TV set is mainly comprised of LA7840 and other components.
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CRT output circuit
The tricolor signals produced by LA76814 will be transmitted to CRT board and then
to the cathode of the TV tube after being amplified by videoamplifier which is
comprised of V902, V912 and V922.
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CCD performance
The CVBS signals produced by LA76814 pin 40 will be amplified and sent to N701
pin 19 via V821 and then processed by software and hardware inside CPU. The
decoded CCD signales will be transmitted to LA76814 pin 14, 15 and 16 via CPU pin
22, 23 and 24.
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V-CHIP performance
Performance of V-CHIP is mainly completed by CPU. The CPU receives grade signals
from the IC bus and executes relative performances and shields those programs of
relative grade.
Integrated circuit reference
1. All integrated circuit voltages
Following voltage data is achieved while the TV set is turned on, and the electric
resistance is achieved when the TV set is turned off. When the status changes, the
data should also be changed. So these data are used as references.
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