Panasonic TC-L42D2 Technical Manual page 31

Power On Part 2_ D2 series
After sending TV SUB On command, F15V and Sound 15V are supplied to A board.
The F15V source also known as the DTV12V is supplied to DC/DC converters,
,
IC5608, IC5606 IC5610 and Q5412.
Provided by IC8001, the panel VCC-ON command turns on the transistor Q5412 to supply
12V to the TC-Board. The 12V enters the TC-Board via connector A21.
On the other hand, the F15V enters IC5608 for conversion to SUB5V.
The F15V is also applied to IC5606 for conversion to SUB1.8V.
IC5610 also converts the F15V to SUB1.2V. The sub-voltages are mainly used to power the
A-Board. They are all monitored by the IC4700 and subsequently IC8001 for their presence.
If any of the sub-voltages is missing, the MPU shuts down the TV and the power LED blinks
3 times.
IC5605 and IC5013 convert SUB 5V to SUB 3.3V.
When IC8001 is satisfied of the presence of all the monitored sub-voltages, it provides the
Backlight_ On command to turn on the inverter (Power supply for the backlights). This
command enters the P-Board via pin 13 of connector P2.
Slide # 31