Service manual

Video Control
After conversion to RGB again, the signals can be controlled for Saturation, Contrast,
and Brightness.
2nd RGB Interface for OSD/CC
On pins 35 to 38, the RGB and fast blanking from the Painter (OSD and CC) are
inserted.
Peak White Limiting
On pin 43 there is a Peak White Limiting signal line (PWL). If the beam current (EHT-
info line) increases, then the EHT-info voltage will decrease. PWL is controlled by
average limiting via R3343/C2333.
Cut-off Control
Switching the TV to Standby:
1. Vertical scan is completed.
2. Vertical flyback is completed (the horizontal output is gated with the flyback
pulse, so that the horizontal output transistor cannot be switched on during the
flyback pulse).
3. Slow stop of the horizontal output is started, by gradually reducing the 'on' time at
the horizontal output from nominal to zero (this will take 50 ms.).
4. At the same time, the fixed beam current is forced via the black current loop for
25 ms., by setting the RGB outputs to a maximum voltage of 5.6 V.