Notice The purchased products, services and features are stipulated by the contract made between Huawei and the customer. All or part of the products, services and features described in this document may not be within the purchase scope or the usage scope. Unless otherwise specified in the contract, all statements, information, and recommendations in this document are provided "AS IS"...
This document provides maintenance instructions for technicians at service centers authorized by Huawei. This service manual is confidential and can be accessed by authorized service sites or companies only. Although every effort has been made to ensure the accuracy of the document, errors may still exist.
U8860 Maintenance Manual 7 Disassembly Procedure Disassembly Procedure 2. Start to disassemble the U8860. 1. Ensure that the ESD wrist strap is well grounded U8860 disassembly guide: 1. Remove the battery cover. 2. Remove the battery. Issue 1.0 (2011-11-14) Huawei Proprietary and Confidential...
11. Clip the buckle of the ZIF interface. 12. Install cover B. 13. Install the six crews in cover B. 14. Install battery. 16. The U8860 is now assembled. 15. Install battery cover. Issue 1.0 (2011-11-14) Huawei Proprietary and Confidential...
The phone provides internal antenna for signal Antenna internal interface transmission and supports WCDMA high and low component, antenna frequency band. U8860-92 phone antennas include protection main antenna, diversity antenna, WiFi/BT antenna, GPS antenna, FM antenna (headphone) Coupler Power coupler Couples part of the output power of WCDMA power amplifier to QTR8615 for power monitoring.
The MSM8255 employs the MDDI interface to transmit command and data to the LCD. The U8860 uses Toshiba's LCD. The U8860 uses Toshiba's LCD LT040MDT9000. It is a TFT module with a point matrix of 480RGB x 854, supporting MDDI interface. Its features are: ...
The anode of the backlight LED LED- The cathode of the backlight LED The U8860 adopts 4.02 inches LCD. The backlight adopts six serial LED lights, which are controlled by the backlight LED-driving chip RT9293BGJ6. Troubleshooting process Failure: The phone can be powered on, but its LCD is blank.
R902. The headphone MIC is supplied with power by MIC_BIAS1 (PM8058/HSED_BIAS1), and it is used for headphone answer detection. U8860's headphone is compatible with two line sequences. The iphone's headphone line sequence is compatible by default. Troubleshooting process Failure: Perform the test using a normal headphone, and no sound is heard.
V power, and then supply the 1.8 V power; otherwise, the touch panel is disabled. When the touch panel is operating, the I2C controls data transmission. Four touching key fields are added to the U8860's 4-inch capacitive touch panel, and four backlight LEDs for the four keys are added to the touch panel module.