Acer B223PWL Acer B223PWL and V223PWL Monitor Service Guide - Page 10

8 1.3.2 Input Signals: Video Input Signals Range (Analog RGB Signal) No. Symbol Item M in 1 Fh Horizontal Frequency 30 2 Fv Vertical Frequency 55 3 Fclk Pixel Clock Frequency 4 Vih High Level Input 2.4 5 Vil Low Level Input 0 6 Video RGB Analog Video Level 0 Max 83 75 148.5 5 0.8 0.7 Unit kHz Hz MHz V V V 1.3.2.1 Video Signal Amplitudes: The video inputs consist of Red, Green and Blue signals each has its own coaxial cable terminated at the monitor. These video signals are analog levels, where 0V corresponds to black, and 700mV is the maximum signal amplitude for the respective color. The video signal is terminated with 75 ohms. 1.3.2.2 Video Signal Termination Impedance: The analog video signal termination shall be 75 ohm. 1.3.2.3 Synchronization (Sync) Signals: The Horizontal Sync (HS) TTL signal is used to initiate the display of a horizontal line. HS may be either active high or active low according to the timing. The Vertical Sync (VS) TTL signal is used to initiate the display of a new frame. VS may be either active high or active low according to the timing. 1.3.2.4 Sync Signal Levels: Level: L = 0V ~ 0.8V H = 2.4V ~ 5V 1.3.2.5 Abnormal Signal Immunity: The monitor shall not be damaged by improper sync timing, pulse duration, absence of sync, abnormal input signal amplitude, or any other anomalous behavior of a graphics card. 1.3.3 User Controls and Indicators: 1.3.3.1 Power On/Off Switch: The monitor shall have a power control switch visible and accessible on the front of monitor. 1.3.3.2 Power Indicator LED: The monitor will be switched to "power saving" mode by the control signal from the display controller, as indicated by the amber-colored power LED.