Checking RF Rx Block, TP1. DCS RX Input

4. TROUBLE SHOOTING

4.7.5 Checking RF Rx Block

TP1. DCS RX INPUT

TP1		TP3	TP2. PCS RX INPUT
			TP2. PCS RX INPUT
			TP3. GSM RX INPUT
	TP2		TP3. GSM RX INPUT
	TP2

	L102
	100nH
	U500	11			Rev.C
		11
19	VDD	ANT	GSM900_RX1	5				TP1	DCS
			GSM900_RX2	6
			GSM900_RX2	1
			GSM1800_RX1	2
7			GSM1800_RX2	3
8	GND1		GSM1900_RX1	4
10	GND2		GSM1900_RX2	9
10	GND3		WCDMA2100	9
12	GND4					1K	R100
13	GND5	D5011	CTRL1	18		1K	R100	ANT_SEL0
15	GND6		CTRL2	22		1K	R101	ANT_SEL1
17	GND7							TP2	PCS
20	GND7
21	GND8		GSM900_TX	16
23	GND9		GSM900_TX	14
23	GND10	GSM18001900_TX		14	C110	C109
	GND10	GSM18001900_TX			C110	C109
					33p	33p

RAMP

TP3

EGSM

+VPWR

Rev.D

C123

C121

C124

L403

GSM

0.01u

33u

L115

100p

1.5nH L116

18nH

10nH

Schematic of GSM900/DCS/PCS Rx Block

Rev.C

C439 5p

C105

NA0.5p

C190

C440 5p

C442 5.6p

C116

NANA

C191

C443 5.6p

L405 2.7nH

C120

NAL111 5.6nH

L406 2.7nH

- 90 -

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 Checking RF Rx Block, TP1. DCS RX Input

Models: U250

4. TROUBLE SHOOTING

4.7.5 Checking RF Rx Block

TP1. DCS RX INPUT

DCS

PCS

RAMP

Schematic of GSM900/DCS/PCS Rx Block

U250 specifications