DSM/ECU/Reverse Engineering: Difference between revisions

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Created page with "==Toolbox== * DSLR * Screwdrivers * Tweezers * Solder * Solder Sucker * Solder Wick * Soldering Iron * SMD/Reflow Air Tool * Chamois cloth ===Solvents=== * Acetone * WD-40 *..."
 
Tag: Manual revert
 
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=Example=
Here is an example of record keeping of the components and PCB references I did on a 1.8l ECU I reversed as practice:
==Exterior==
<gallery>
Image:MD159561-E2T33674E.png|ECU top
Image:MD159561-E2T33674E-side.png|ECU Exterior, Side
</gallery>
===Top===
  MD159561
  E2T33674E
  0607
  Mitsubishi Electric Corp.
  Japan
===Side===
  9561
  E2T33674E
  Mitsubishi Electric Corp.
  Japan
==Interior==
<gallery>
</gallery>
===Processor===
[[DSM/ECU/TMP76xxx MH6xxx]]
[https://app.gitbook.com/s/-MbMmcGjBEeIX30liMDB/ DSM-ECU Book]
===EPROM===
* E924
===PCB===
BOM: [[DSM/ECU/JE331B988B]]
<gallery>
Image:MD159561-E2T33674E-board-overview.png|Board overview
Image:1.8l dsm-ecu-traces.png|Copper traces of PCB
Image:JE331B-silkscreen.png|Silkscreen
Image:JE331B-top.png|Top layer photo
Image:JE331B-bottom.png|Bottom layer photo
</gallery>
==How-To==
===Hardware===
# Obtain ECU
# Take external photographs
#* Mostly for all the numbers and letters/the stickers
# Open ECU
# Remove PCB
# TAKE MORE PICTURES (before you touch anything else)
#* The code on the plug socket
#* The microprocessor
#* The EPROM (if there is one)
#* Any and all visible marking on components
#* The ENTIRE board on BOTH sides
# RECORD all components with visible markings, decode resistor values
#* This means a table with the PCB Silkscreen references and the components values
# ACETONE bath
#* This is to remove all the conformal coating junk that interferes with reading markings AND the ability to probe, test, and desolder
# SCRUB with Toothbrush, Q-Tips
# PHOTOGRAPH and RECORD any newly visible information
# REMOVE any components with known values:
## Electrolytic capacitors can go first
## Then any ICs
## Resistors with the bands already decoded
## Connectors
# REMOVE components with unknown values ONE AT A TIME
## SMD Capacitors and Transistors are good examples
## Remove one, use the Multimeter and/or LCR meter to get values and RECORD them in the table
# Eventually you will be left with a BARE BOARD
# SPRAY and WIPE DOWN the bare PCB with WD-40 to clean up any remaining conformal coating and junk
#* This preps the board for nice clear photographs
# PHOTOGRAPH both sides of the PCB
#* Get ONE photo of EACH side of the PCB
#* Flat
#* In focus
#* Dead-on photos with no perspective error
#* Use a tripod
#* Use lighting
#* Use a remote shutter-release to eliminate shake from the image
===Digitization===
# Do color correction in darktable
# Import to GiMP and isolate the Silkscreen to generate a silkscreen layer
# Import into Inkscape to create a vector of the copper traces
# Use the last two steps to import into KiCad
#* Recreate the PCB
#* Create a schematic from the PCB
===Result===
# A BOM of sorts
#* List of all the components, and their values and locations on the PCB
# A Schematic of the electrical connections
# A PCB layout
# Lots of photos
# ROM dumps of all ROM, Internal ROM and EPROM
# Disassembly of all ROM, Internal and External
==Toolbox==
==Toolbox==
* DSLR
 
===Tools===
* Screwdrivers
* Screwdrivers
* Tweezers
* Tweezers
Line 9: Line 115:
* SMD/Reflow Air Tool
* SMD/Reflow Air Tool
* Chamois cloth
* Chamois cloth
* Multimeter
* LCR Meter


===Solvents===
===Solvents===
* Acetone
* Acetone
* 99% Isopropyl alcohol
* WD-40
* WD-40
* Flux
* Flux
* Flux cleaner
* Flux cleaner
* H20
* H2O


==How-To==
===Camera===
# Obtain ECU
* DSLR
# Take external pics
* Tripod
#* Mostly for all the numbers and letters/the stickers
* Circular-polarized lens
# Open ECU
* Remote shutter-release
# Remove PCB
* Lighting
# TAKE MORE PICTURES (before you touch anything else)
 
#* The code on the plug socket
===Software===
#* The microprocessor
* Darktable
#* The EPROM (if there is one)
* GiMP
#* Any and all visible marking on components
* Inkscape
#* The entire board on both sides
* KiCad
# RECORD all components with visible markings, decode resistor values
#* This means a table with the PCB Silkscreen references and the components values

Latest revision as of 19:05, 23 February 2026

Example

Here is an example of record keeping of the components and PCB references I did on a 1.8l ECU I reversed as practice:

Exterior

  • ECU top
    ECU top
  • ECU Exterior, Side
    ECU Exterior, Side

Top

 MD159561
 E2T33674E
  0607
 Mitsubishi Electric Corp.
 Japan

Side

 9561
 E2T33674E
 Mitsubishi Electric Corp.
 Japan

Interior

Processor

DSM/ECU/TMP76xxx MH6xxx

DSM-ECU Book

EPROM

  • E924

PCB

BOM: DSM/ECU/JE331B988B

  • Board overview
    Board overview
  • Copper traces of PCB
    Copper traces of PCB
  • Silkscreen
    Silkscreen
  • Top layer photo
    Top layer photo
  • Bottom layer photo
    Bottom layer photo

How-To

Hardware

  1. Obtain ECU
  2. Take external photographs
    • Mostly for all the numbers and letters/the stickers
  3. Open ECU
  4. Remove PCB
  5. TAKE MORE PICTURES (before you touch anything else)
    • The code on the plug socket
    • The microprocessor
    • The EPROM (if there is one)
    • Any and all visible marking on components
    • The ENTIRE board on BOTH sides
  6. RECORD all components with visible markings, decode resistor values
    • This means a table with the PCB Silkscreen references and the components values
  7. ACETONE bath
    • This is to remove all the conformal coating junk that interferes with reading markings AND the ability to probe, test, and desolder
  8. SCRUB with Toothbrush, Q-Tips
  9. PHOTOGRAPH and RECORD any newly visible information
  10. REMOVE any components with known values:
    1. Electrolytic capacitors can go first
    2. Then any ICs
    3. Resistors with the bands already decoded
    4. Connectors
  11. REMOVE components with unknown values ONE AT A TIME
    1. SMD Capacitors and Transistors are good examples
    2. Remove one, use the Multimeter and/or LCR meter to get values and RECORD them in the table
  12. Eventually you will be left with a BARE BOARD
  13. SPRAY and WIPE DOWN the bare PCB with WD-40 to clean up any remaining conformal coating and junk
    • This preps the board for nice clear photographs
  14. PHOTOGRAPH both sides of the PCB
    • Get ONE photo of EACH side of the PCB
    • Flat
    • In focus
    • Dead-on photos with no perspective error
    • Use a tripod
    • Use lighting
    • Use a remote shutter-release to eliminate shake from the image

Digitization

  1. Do color correction in darktable
  2. Import to GiMP and isolate the Silkscreen to generate a silkscreen layer
  3. Import into Inkscape to create a vector of the copper traces
  4. Use the last two steps to import into KiCad
    • Recreate the PCB
    • Create a schematic from the PCB

Result

  1. A BOM of sorts
    • List of all the components, and their values and locations on the PCB
  2. A Schematic of the electrical connections
  3. A PCB layout
  4. Lots of photos
  5. ROM dumps of all ROM, Internal ROM and EPROM
  6. Disassembly of all ROM, Internal and External

Toolbox

Tools

  • Screwdrivers
  • Tweezers
  • Solder
  • Solder Sucker
  • Solder Wick
  • Soldering Iron
  • SMD/Reflow Air Tool
  • Chamois cloth
  • Multimeter
  • LCR Meter

Solvents

  • Acetone
  • 99% Isopropyl alcohol
  • WD-40
  • Flux
  • Flux cleaner
  • H2O

Camera

  • DSLR
  • Tripod
  • Circular-polarized lens
  • Remote shutter-release
  • Lighting

Software

  • Darktable
  • GiMP
  • Inkscape
  • KiCad
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