*How to identify the value of the location 0240 on the EEPROM
CALCULATION OF THE NEW VALUES OF THE LOCATIONS
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SEPDISP56
Porsche 987 and 997 display installation
WARNING! The repair should be carried out only by qualified and competent staff.
- Before installing the new SEPDISP28N display, please read carefully the following instructions. Our technicians, for illustrative purposes only, have made a video tutorial about how to repair the odometer.
- DON’T SKIP ANY STEP.
INSTALLATION OF THE DISPLAY “SEPDISP56” AND OF THE BACKLIGHT SHEET
- Replace the display in an ambient temperature of 25 °C.
- Replace the backlight placed under the original LCD with the one supplied with the Minitools part to avoid chromatic discrepancies.
Replace the backlight placed under the original LCD with the one supplied with the Minitools part to avoid chromatic discrepancies. To watch it, click on the button below.
1
Remove the original display.
2
Undo and remove the diffuser and the pink original backlight.
3
Fit and secure the new Minitools backlight.
4
Re-insert the diffuser.
5
Fit the new Minitools display
After replacing the LCD, switch on the cluster (pin nº 1 negative, pin nº 2 positive) and, with a multimeter, measure the voltage on the PCB on which the display is connected, between the points A and B indicated in picture 1.
- If the voltage measured is between 11,95 V and 12,05 V, no modification is necessary;
- If the voltage detected is, instead, lower than 11,95V or higher than 12,05V, it is necessary to do the modification described in the following paragraph “EEPROM MODIFICATION“.
EEPROM MODIFICATION
NOTE: For this modification it is necessary to use an EEPROM programmer. We recommend our SEP-EECLIP.
• First, set the programmer reading in hexadecimal (HEX).
• De-solder the 93LC86 EEPROM (highlighted in picture 2), which is located inside the metal enclosure on the rear side of the display PCB.
• ATTENTION: Make a backup of the de-soldered EEPROM, before the modification.
• To reach a voltage between 11,95V and 12,05V, it is necessary to modify the value of the location 0240. Please note that increasing or decreasing these locations by 1 HEX unit, the variation will be +/-0,00625V.
If not familiar with hexadecimal calculation, it is possible to use the calculation tool in the box beside, simply typing in the values.
VERIFICATION
Once these modifications have been done, measure again the voltage between the points A and B and check that it actually is between 11,95V and 12,05V. If not, increase or decrease the location until the value is as close as possible to the correct range.