Y210 Mobile Phone
Maintenance Manual
9 Principles and Failure Analysis
Huawei Proprietary and Confidential
Copyright © Huawei Technologies Co., Ltd.
The KYPD_DRV_N (PM8029) is used to adjust the brightness of the keypad's backlight, and
VPH_PWR is used to supply power to the backlight LEDs. The keypad backlight is provided
by two white LEDs. The light from the LEDs is transmitted to the key area using a light guide
film.
Table 9-13 Keypad backlight driver
When this pin's voltage is at a low level, the two
backlight LEDs turn on.
Figure 9-23 Touch key backlight circuit
9.4.7 Battery Connector
Figure 9-24 Battery connector circuit
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