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Panasonic TC-P50S1 User Manual

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Slide #30
Sub-Voltages Distribution
On previous generations these voltages were present for approximately 15 seconds after 
connecting the TV to the AC line. This does not apply to this year’s models.
These voltages are called sub-voltages and they are only used by the A board.
The sub-voltages are developed when the power is turned on.
The F+15V from the P board is the source that supplies the DC-DC converter circuit 
(IC5401, IC5603 and IC5401) in the A board. The A board outputs 9V, 5V, 3.3V, 1.8V.
The BT30V is generated by IC5480.
A 10 blinks code from the power LED indicates abnormalities in any of these voltages 
including the F+15V.