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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.
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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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Long Term: Skyworks will qualify the 1290s Sumitomo Die Attach Epoxy to
replace the 1079B Epoxy. The 1290s Epoxy has a better thermal conductivity
and will also qualify for all lead-free solder applications.
Field Service Action
Customer Returns:
When servicing customer returns for the affected products listed above, with
Voice Call related complaints, then:
1. Prior to applying heat, Verify units exhibit very low or no RF Output Power in
Low and/or High Bands at a lower than normal current draw (~ 100-200mA). In
most cases, when the failure mode is confirmed in one band, the other band
functions properly with normal power and current.
a. If failure symptoms do not match above, follow normal troubleshooting
techniques to determine the defect.
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
risk to re-fail if not replaced. After removal of the PA Shield with heat failure symptoms
may disappear.
2. Replace the PA with a 5189818N01 part with a lot code 0430 or later. See
image above.
3. Perform required re-phasing and completely retest the unit to confirm
successful repair of the failure.
Classification:
Motorola Internal Information
Strictly released for Motorola Authorized Service Center Use only.
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Service Inventory:
Existing inventory of the 5189818N01 Skyworks Eagle IC should be purged of Lot
Codes prior to 0430.
Call Center Action:
If the customer calls with any call related complaints mentioned above, then have
the customer return the unit to an authorized service center for repair.
Service Entry Code:
Please ensure that repairs of this type are logged on the Service Link database
as follows:
Global M-Claims Codes:
Customer Complaint Code:
CPR01 (Voice Call – Can’t Make Calls)
CPR03 (Voice Call – No Service)
CPR05 (Voice Call – Drop Call/Poor Reception)
Problem Found Code: CPR01 (Voice Call – Can’t Make Calls)
Reference Designator Code: U (Integrated Circuit/Module)
Repair Code:
REP01 (Replace Electrical Part – Defective)
Classification:
Motorola Internal Information
Strictly released for Motorola Authorized Service Center Use only.
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