Key Pad, Table. Key Matrix Mapping Table

3. TECHNICAL BRIEF

3.11.4. Key Pad

There are 23 main key buttons in Figure.

Shows the Keypad circuit. ‘END’ Key is connected to PMIC(PM6650).

	COL0	COL1	COL2	COL3	COL4

ROW(0)			-	CLR	MENU

ROW(1)	1	2	3	LEFT	UP

ROW(2)	4	5	6	OK	RIGHT

ROW(3)	7	8	9	SEND	SEARCH

ROW(4)	*	0	#	DOWN	BACK

Table. Key Matrix Mapping Table

VREG_MSMP_2.7V

R423

KEY_ROW(0)

KEY_ROW(1)

KEY_ROW(2)

KEY_ROW(3)

KEY_ROW(4)

KEY_COL(0)

KEY_COL(1)

KEY_COL(2)

KEY_COL(3)

KEY_COL(4)

		2 4 6 8	KEY MAP
100K	RA400	100K			CLR
		1 3 5 7

		400	401	402	LEFT
		1	2	3
		403	404	405	OK
		4	5	6
		406	407	408	SND
		7	8	9
		HOT400	409	HOT401	DN
		HOT4	0	HOT3

RIGHT

BACK

Figure 1.19 Main Keypad Circuit

END

PM_ON_SW_N

END

Figure 1.20 END Keypad Circuit

- 57 -

U250 specifications

The LG Electronics U250 is a distinguished device known for its cutting-edge features and innovative technologies within the mobile phone sector. Launched as part of LG's effort to cater to a growing demand for functional yet stylish smartphones, the U250 boasts an array of characteristics that appeal to a savvy clientele.

One of the primary features of the U250 is its impressive display. Sporting a vibrant screen that offers excellent color reproduction and clarity, it enhances the user experience for gaming and multimedia consumption. The responsive touchscreen interface allows for seamless navigation, making it user-friendly for all age groups.

The U250 is powered by a robust processor that ensures smooth performance, whether multitasking between applications or running demanding games. With ample RAM, it minimizes lag and enhances the overall operating experience, allowing users to switch effortlessly between tasks.

Photography enthusiasts will appreciate the U250's advanced camera system. It is equipped with a high-resolution primary camera that captures stunning images in various lighting conditions. The inclusion of features like autofocus and image stabilization significantly elevates the quality of photos and videos. Additionally, the front-facing camera is designed for high-quality selfies and video calls, ensuring that users can always stay connected.

The device supports a range of connectivity options, including 4G LTE, Bluetooth, and Wi-Fi, ensuring users can remain connected to the world around them. The integration of NFC technology also enables quick and convenient transactions, particularly useful in a cashless society.

Battery life is another standout characteristic of the U250. With a durable battery, it offers extended usage time, allowing users to go through their day without the constant worry of recharging. Coupled with fast-charging capabilities, it reduces downtime significantly.

The LG U250 runs on an intuitive operating system that provides easy access to a plethora of apps on the platform. Customization options are abundant, allowing users to tailor their device's appearance and functionality to suit their preferences.

In conclusion, the LG Electronics U250 combines striking design with versatile functionality, making it a formidable entry in the smartphone market. With its impressive display, powerful performance, advanced camera features, and strong battery life, the U250 is poised to meet the needs of modern users seeking both style and substance in a mobile device. Whether for work or leisure, this smartphone is designed to enhance everyday life.

LG Electronics U250 service manual Key Pad, Table. Key Matrix Mapping Table

Models: U250

3. TECHNICAL BRIEF

3.11.4. Key Pad

COL0

COL1

COL2

COL3

COL4

Table. Key Matrix Mapping Table

KEY MAP

Figure 1.19 Main Keypad Circuit

Figure 1.20 END Keypad Circuit

U250 specifications