# DFMEA (Design FMEA) on Printed Circuit Boards (PCB's)

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#### Riskophil

Hey guys,

i got a question regarding creating DFMEAs for PCBs.
We are producing medical devices that look like mobile phones. Now we are curious if we could improve our design quality using a DFMEA.
Is there anyone that has done some DFMEAs on electronics?

Our first idea was to divide our pcb into functional groups and then do the rating. Is this a good way to do some analysis? What are typical, appropirate mitigation measures???

#### Stijloor

Staff member
Super Moderator
A Quick Bump!

Can someone help?

Thank you very much!!

Stijloor.

M

#### mayank_thkkr

Welcome to the Cove..!

The ideal approach should be to do Functional Analysis before DFMEA.

In my current organization we did DFMEA on Control System (SCADA).

We started with

Functional Analysis :

1. Product Structure Tree: System, Sub-system, Component level identification.

2. Item Function Worksheet : List down all the function in Verb-Noun and When form. Further categorize them in Basic Function, Secondary Function, Same time Function, All the Time Function, Design Function.

3. Boundary Diagram : Interaction of components within the systems and with surrounding systems as well as Environment. (Physical, Energy, Mass and Information related interactions)

4. Interface Matrix : It Illustrates relationships between the subsystems, assemblies, subassemblies, and components within the object as well as the
interfaces with the neighboring systems and environments. (Interface Regarding PEMI - Physical, Energy, Mass and Information) Further it identifies the type of Interface required:

+2 if Interaction is necessary for the function
+1 if Interaction is essential but, not absolutely necessary for the function
0 If Interaction does not effect functionality
-1 If Interaction causes negative effect but does not effect functionality
-2 If Interaction must be prevented to achieve functionality.

5. Parameter Diagram : Identify Noise factors Occurring due to (Mfg variation, Environment interaction, Component to Component Interaction Customer Abuse, Wear over time etc)

Refer to the attached figure to see the linkages of this Functional Analysis stage with DFMEA.

Apart from DFMEA you will have action points coming out from Interface Matrix and Parameter Diagram.

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Why the Greek god Hephaestus should have done a design FMEA (DFMEA) on his giant robot APQP and PPAP 1
Definition DFMEA (Design FMEA) - Definition Definitions, Acronyms, Abbreviations and Interpretations Listed Alphabetically 0
Determining Effect of Failure without a DFMEA (Design FMEA) FMEA and Control Plans 1
M Severity Reduction in a Design FMEA (DFMEA) FMEA and Control Plans 26
G How to identify Key Characteristics (KC) in a Design FMEA (DFMEA) FMEA and Control Plans 2
R Rear Axle Gear Group DFMEA (Design FMEA) - Example wanted FMEA and Control Plans 2
M ISO 14971 Risk Analysis and use of a DFMEA (Design FMEA) ISO 14971 - Medical Device Risk Management 8
DFMEA (Design FMEA) at Vehicle Level - Some inputs needed. FMEA and Control Plans 4
P Design FMEA (DFMEA) Basics - Help needed IATF 16949 - Automotive Quality Systems Standard 3
S DFMEA (Design FMEA) for a New Line Operation of the Underground Operation FMEA and Control Plans 10
T Electronic Assembly Design FMEA (DFMEA) FMEA and Control Plans 6
Reverse Engineering a Design FMEA using aerospace DFMEA guidelines FMEA and Control Plans 2
T DFMEA (Design FMEA) - We already have a PFMEA (Process FMEA) FMEA and Control Plans 5
P Design FMEA (DFMEA) required on all products and their parts? Design and Development of Products and Processes 5
R Can a DFMEA (Design FMEA) effectively analyse design modifications? FMEA and Control Plans 12
C DFMEA (Design FMEA) and PFMEA (Process FMEA) - Who should lead? FMEA and Control Plans 14
A DFMEA (Design FMEA) - Occurance and Detection Ratings FMEA and Control Plans 2
B How to fill s/c and c/c in DFMEA (Design FMEA)? Design and Development of Products and Processes 3
DFMEA - Is a Design FMEA required? FMEA and Control Plans 3
M DFMEA (Design FMEA) for Trailers or any heavy vehicle design Design and Development of Products and Processes 1
N How to Calculate RPN in Design FMEA (DFMEA) vs. Process FMEA (PFMEA) FMEA and Control Plans 9
M When to start a DFMEA (Design FMEA)? APQP and PPAP 2
B What is the meaning of the Occurrence in the DFMEA (Design FMEA)? FMEA and Control Plans 8
R DFMEA (Design FMEA) - Document or Record? Document Control Systems, Procedures, Forms and Templates 3
W DFMEA (Design FMEA) for Bulk Material - Resin for Plastic Injection Moulding FMEA and Control Plans 1
DFMEA (Design FMEA) - Plastic Injection Molding FMEA and Control Plans 2
T Ballpoint Pen DFMEA (Design FMEA) FMEA and Control Plans 13
L Special Characteristics in DFMEA (Design FMEA) - Carry over to PFMEA? FMEA and Control Plans 9
Y Design (DFMEA) and Process (PFMEA) FMEA Failure Mode Identification Design and Development of Products and Processes 8
S Control Plan and Design FMEA (DFMEA) Links FMEA and Control Plans 4
DFMEA - Machinery Design Best Practices FMEA and Control Plans 0
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S DFMEA when the supplier doesn't have design responsibility APQP and PPAP 15
Design for Assembly in DFMEA - Failure Effect of Sub-System(s) FMEA and Control Plans 5
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J Selection Matrix for DFMEA Focus in New Product Design FMEA and Control Plans 7
T DME (design margin evaluation) vs. DFMEA Design and Development of Products and Processes 3
Commerical off the shelf items (COTS) in DFMEA's (Design FMEAs) FMEA and Control Plans 5
M 7.3.2.2 - Process Design in Remanufacturing - Registration Finding for no DFMEA Design and Development of Products and Processes 8
G Detection Rating in Design FMEAs (DFMEA) FMEA and Control Plans 2
DFMEA Design Control response FMEA and Control Plans 4
The note at the bottom of DFMEA occurrence tables in AIAG VDA FMEA FMEA and Control Plans 0
AIAG VDA DFMEA Template Required FMEA and Control Plans 2
Equipment URS, pFMEA and dFMEA ISO 14971 - Medical Device Risk Management 3
DFMEA/PFMEA mitigation of high severity (9-10) in low volume products IATF 16949 - Automotive Quality Systems Standard 1
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Understanding DFMEA and PFMEA - Supplier Related IATF 16949 - Automotive Quality Systems Standard 21
Best practice for identifying "items" of parts for DFMEA analysis AS9100, IAQG, NADCAP and Aerospace related Standards and Requirements 2
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