Service manual

2. Now the HOP is driving the line circuitry with 50kHz pulses. At the base of the
line transistor this is sensed via the 'STANDBY' line.
3. This signal triggers the Main supply to operate. Now the line stage has 'BAT'
voltage (141 V); it will also start.
4. After the 5V and 8V supply lines are sensed by the Painter (via I
2
C), it will read
the POR bit from the HOP via the I
2
C bus.
5. Now the HOP is switched into 'on' mode and the set will start up further with
normal drive (31.468kHz for NTSC).
6. The last step will be the unblanking of the picture.
Note: So standby is not controlled via a standby line from the microprocessor, but is
achieved indirectly via the HOP circuitry.