Theory Of Circuit Operation - Vizio P50HDM - 50" Plasma Panel Service Manual

Chapter 8
The operation of User Interface
The following diagram provides a brief overview of the user-interactive components of
the firmware.
The operation of keypad
There are 8 keys to control and select the function of SHD-3010 and also have two LED to
indicate the status of operation. They are "Power, Source, MENU, ▼▲, + -" keys and LED.
1.The power key controls video processor FLI8532, FLI8532 will receive a low signal to turn
on or off system while press the power key.
2.The other seven keys are on high state because the pull up resistor but will transit to low
state dependent on which key pressed, and the state will be reader by FLI8532 through
internal ADC to act corresponding function.
3.The LED is constructed with two color LED which color is Yellow and Green. The FLI8532
direct control the LED's when FLI8532 (VPCON) is low the LED is Yellow (Close power)
when FLI8532 (VPCON) is high the LED is Green (Open power).
CONFIDENTIAL – DO NOT COPY

Theory of Circuit Operation

Figure 8-1 User Interface Block Diagram
Page 8-1
File No. SG-0173