Service manual

DACs. The YUV are output at pin-39, 37 & 35 of IC7803 respectively. In order to display
the PIP sub-picture correctly on the main picture, the VFB & SANDCASTLE sync
signals from the deflection are connected to IC7803 pin-33 & 32.
The sub-picture YUV signals are fed to fast switching IC7919 TDA8601 pin-6, 7 & 8. In
normal operation (w/o PIP), the main picture YUV signals ( at pin-2, 3 & 4) are
bypassed by IC7919, and returned back to the main video processor. When PIP mode
is active, the sub-picture YUV signals are used and fed to main video processor. The
control is made possible by fast blanking signal from IC7803 pin-1.
Guide+ (NAFTA only)
The CVBS_TER_MAIN & CVBS_TER_PIP signals for the Guide+ decoding are
routed/taken from the PIP panel along together with the switching signals (RESET,
SEL_YUV_RGB & SEMI-STD-BY) derived from the IO expander IC7910.
Semi-Standby (NAFTA only)
The Semi-standby is used when Guide+ controller wants to capture the data when the
set is in standby mode. Normally this is done once every night when the set is in
standby mode. During this mode to reduce the load of the power supply the PIP circuitry
is switch-off by TS7911 & TS7912. IO expander IC7910 pin-12 does the Semi-standby
switching. Table-3 shows the Semi-standby switching logic.