Acer AL1716 AL1716W Service Guide - Page 12

2. Flat Panel Specification (continued) ACER AL1716W 11 Go to cover page Note (2) Input Rush Current measurement condition 2.8 Back-Light Unit The back- light system is an edge-lighting type with 2 CCFL. The characteristic of the lamp is shown in the following tables. Item Lamp current Lamp voltage Frequency Operating lamp life time Startup voltage Symbol IL VL fL Hr Hr Vs Min. 3.0 30 30,000 40,000 1200 1400 Typ. Max. Unit 8.0 9.0 mA(rms) 610 - V(rms) - 80 KHz -- Hour -- Hour --- V(rms) Note (1)(6) (6) IL=8.0mA (2) (3) IL=8.0mA (3) IL=7.5mA (4)(5) at 25oC (4)(5) at 0oC Note (1) Lamp current is measured with current meter for high frequency as shown below. Specified valued are for single lamp. Note (5) The voltage over specified value (Vs) should be applied to the lamp more than 1 second after startup. Otherwise, the lamp may not be turned on. The used lamp current is the lamp typical current. Note (6) The output voltage waveform and current waveform of the inverter must be symmetrical (Unsymmetrical ratio is less than 10%). Please do not use the inverter which has unsymmetrical voltage and current waveform, and spike waveform. The inverter design which can provide the best optical performance, power efficiency, and lamp life should under the following conditions. a. The asymmetry rate of the inverter waveform should be less than 10%. b. The distortion tae of the waveform should be within c. The inverter output waveform should be better similar to the ideal sine wave. Note (2) Lamp frequency may produce interference with horizontal synchronous frequency and this may cause ripple noise on the display. Therefore lamp frequency shall be kept away from the horizontal synchronous frequency and its harmonics as far as possible in order to avoid interference. *Suggest the inverter frequency avoid fL=51~59KHz Note (3) Lamp life time (Hr) can be defined as the time in which it continues to operate under the condition: Ta=25 3 oC, typical IL value indicated in the above table and fL=52kHz until the brightness becomes less than 50%. Note (4) CCFL inverter should be able to provide a voltage over specified value (Vs) in the above table. Lamp units need at least Vs value shown above to ignition. 2.9 Switching Characteristics for LVDS Receiver