Motorola SI6712 Service Manual
M
Middle East & North Africa
Personal Communication Sector
Field Service Information
Skyworks PA Module Low output power failure
Our Reference: SI45_9_2004
Date: Sep 29, 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: Sept 29, 2004
Our Reference: SI45_9_2004
Product/System:
V300, V303, V400, V600, V220, E398, C650, C550, V180.
Subject: Skyworks PA Module Low output power failure
FIELD SERVICE INFORMATION
Problem:
Service is aware of an issue with the 5189818N01 Skyworks Eagle IC used on
current GSM Products. Several GSM NPI customer return units, returned with
customer complaints of "No Service", "Can't Make Calls", and "Drops Calls" were
found to have very Low or No Output Power in Low and/or High bands. The low
power failures have been confirmed to be caused by a defective Skyworks Eagle
PA. In-depth analysis by Skyworks/Motorola Team found an open internal to
component at the Bias Control IC. Internal current measurements show a high
resistance to ground from top of the 2
open is believed to a die attach epoxy failure were the 1079B conductive epoxy
becomes weak and does not properly adhere to the die and substrate surfaces.
Note: This failure mode can be temporarily recovered by applying heat to the
component's surface. Our data shows that these recovered components have a very high
Solution
Short Term: As of July 14, 2004, A HCDT (High Current Density Test) Screen
was implemented at the supplier to screen potentially weaker components. The
Rev. A version of the HCDT Screen, Lot Code 0430 and later, effectively
screened out the Low Power/Low Current failure mode. Several modifications
were incorporated into the Rev. D version of the HCDT Screen, 0436 and later,
which is effective in screening out potential High Current failures as well.
Classification:
Motorola Internal Information
Strictly released for Motorola Authorized Service Center Use only.
nd stage PA Die. The root cause of this
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