Acer Aspire 1800 Aspire 1800 Service Guide - Page 34

Keyboard Item Windows logo key Yes Internal & external keyboard work Yes simultaneously Specification Battery Item Vendor & model name Battery Type Pack capacity Cell voltage Number of battery cell Pin 1 Pin 2 Pin 3 Pin 4 Pin 5 Pin 6 Pin 7 Pin 8 Pin 9 Specification Panasonic/Sanyo Li-ion 60Wh 3.7V/cell/2000mAh High discharge rate 8 Package configuration BATT+: Battery+, Battery Positive Terminal ID : Identify Pin (Note 1) B/I : Battery-In Pin TS : Connect to Thermister SMD : SMBus data interface I/O pin SMC : SMBus clock interface I/O pin GND : Battery Negative Terminal NOTE: 1. Li-ion Battery: Connect 1K ±5 % ohm resistor to GND in Battery PCB. NOTE: B/I pin: Battery can be Charged/Discharged only while this pin is connected to GND. LCD Inverter Specification No. Panel Model Type Frequency (KHz) 1 LG LP171W0 17" WXGA 45/60/70 1-A4-K2 2 Samsung LTN170W 17"WXGA 55/60/65 X-L01 3 AU B170PW0 17"WXGA 50/60/70 1 4 LG LP171W0 17"WXGA 40/60/80 2-A3 Current (mA) 3.5/6/6.5 4/6/6.5 -/6/7 3/6.5/7 VS at 0 ° C 1500Vrms 1800Vrms 1500 Vrms 1560 Vrms Work Voltage 750 Vrms at 6mA 730 Vrms at 6mA 785 Vrms at 6mA 720 Vrms at 6.5mA Brightness 130/160 145/170 160/190 145/170 There are two control signals that come form system to control lamp brightness. One signal is named DAC_BRIG, which limits current to meet LCD lamp current specification. Another one is named PWM, which adjusts lamp brightness. This inverter brightness is adjusted by PWM burst mode. The PWM burst mode is to turn on and off the lamp at rate of 150Hz. The effective brightness is varied with the duty cycle. 26 Chapter 1