Display & Keyboard Backlight; Lcd Backlight; Keyboard Light Effects; Lcd - Nokia 2650 Service Manual

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Display & Keyboard Backlight

LCD Backlight

LCD Backlight consists of 2 side firing white LED's, which are placed on the display FPC below
the LCD area.

Keyboard light effects

Keyboard is lighting up by 2 white side firing LED's for keyboard. 3 blue LED's are used for Light
effects in the keyboard.

LCD

The LCD display module is a 130 x 3RGB x 130, 4096-color/ 256-color /8-color transflective
passive matrix (CSTN) LCD display.
The LCD module interface follows 130x130 X4_CSTN Display module interface specification
(Nokia doc. Code: DHS02040-EN 0.2). Nile display family is using serial interface only

Memory Module

The RH-53/54 baseband memory module consists of external burst NOR flash memory 8Mbyte
(64Mbit) and CMOS 2Mbyte (16Mbit) PSRAM
The flash interface follows the common baseband interface.
The operations voltage is Vcc=1.8 V (Voltage range 1.7-1.9 V).

Fold detection-switch

Detection for fold position has been done with HALL- switch SH248CSP which is located in low-
er block part and the magnet is located on upper block.
The output is high level for B=0mT (flip open).
28 COMPANY CONFIDENTIAL
Copyright © 2005 Nokia. All Rights Reserved.
RH-53/54
8-System Module
Issue 2 06/2005