Samsung SyncMaster 940Fn, Service Manual

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13 Circuit Descriptions
13-1
13 Circuit Descriptions
13-1 Overall Block Structure
13-1-1
Power Tree
1. When the AD board is in DPMS state:
1.1 The Scaler consumes power up to 27mA
1.2 The power to the panel is switched off
1.3 The MCU consumes power up to 23mA.
--> The total current consumption to the DPMS is less then 60mA
and the total power consumption is 0.6W + 5V*60mA = 0.9W so that the total power consumption is
less than 1W.
2. When the AD board is operating normally:
2.1 The maximum power consumption of the panel lamps is described below (It may vary depending on
the panel manufacturer)
17" : 4*(7.5mA*650mVrms)=4*4.9=19.6W
19: : 4*(7.5mA*720mVrms)=4*5.4=21.6W
2.2 The power consumption of the Panel Control board is as follows: 5V*720mA=3.6W
2.3 The power consumption of the Scaler is as follows: 3.3V*245mA + 1.8V*300mA = 1.35W
2.4 The power consumption of the MCU is as follows: 5V*44mA =0.22W