Motorola SI51 Service Manual

M

Middle East & North Africa
Personal Communication Sector

Field Service Information

GSM Triplets – Display Audio Hinge Flex trace crack issue

Our Reference: SI42_8_2004

Date: August 27, 2004

Pages (including this page): 4
Prepared by:

Ehab Elhosary

Regional Technical Support Engineer
Middle East and North Africa.

Classification:
Motorola Internal Information
Strictly released for Motorola Authorized Service Center Use only.

M

Middle East & North Africa
Date: August 27, 2004
Our Reference: SI42_8_2004
Product/System: Triplets
Subject:

Triplets no display due to flex cut

FIELD SERVICE INFORMATION

Problem

Triplets Field Failure data show that some of “No Display” defect symptom with
root cause has been identified as an open circuit in the Display Audio Hinge Flex.
Further Analysis reveals that copper trace cracks at Static Bend near 30 pin BTB
connector. Diagram 1.0 shows the copper traces with micro-crack opens.

Solution

Design change of Flex construction to include large Air gap at the static bend
location. Diagram 2.0 shows the details. The Triplets Audio Hinge Flex is a Multi-
Layer flex with 4 Copper layers. The design change significantly increased the
width of the air gap to allow more flexible compliance in the 4 layer flex structure.
Effectiveness of this corrective action was verified by statistically significant
improvement in static bend reliability.
Solution Implementation date:
V600: cut-over to 0189217N01 Rev B on May 26, 2004.
V300/V303/V400/V500/V501/V525: will cut-over to 0188928N01 Rev D in the
2nd week of September 2004.

Classification:
Motorola Internal Information
Strictly released for Motorola Authorized Service Center Use only.