Mercedes W169 and W245 dashboard display

SEPDISP08-7V

Modification for Mercedes A and B Class instrument clusters display

WARNING: This process is recommended only to expert and qualified staff

THE FOLLOWING MODIFICATION IS NECESSARY FOR THE CORRECT FUNCTIONING OF SEPDISP08-7V DISPLAY.

Replace the display in an ambient temperature of 25 °C.

After replacing the LCD, switch on the cluster (pin no. 1 negative, pin no. 5 and no. 6 positive) and measure the voltage between A and B points as in picture 1.

• If the voltage measured is between 6.95V and 7.05V no modification is necessary;

• If the voltage detected is instead lower than 6.95V or higher than 7.05V, it is necessary to do the modification described in the following paragraph “EEPROM MODIFICATION“.

Where to measure the voltage on Mercedes-Benz A-Class and B-Class instrument panels
Picture 1

Eeprom Modification

NOTE: For this modification, it is necessary to use an EEPROM programmer.
We recommend our SEP-EECLIP

De-solder the EEPROM (24C04 or 24C32), highlighted in picture 2, located on the PCB.
• First, set the programmer reading in hexadecimal (HEX).
ATTENTION: Make a backup of the EEPROM, before the modification.
• To reach a voltage between 6.95V and 7.05V, identify the 01BF and 01CF locations and modify their values: increasing or decreasing the 2 values by 1 HEX unit, the variation will be +/- 0.09V.

If not familiar with hexadecimal calculation, it is possible to use the calculation tool in the box below, simply typing in the values.

NOTE: For the version that can be used offline, download the PDF.

Verification

Once these operations have been done, solder back the EEPROM on the PCB,
switch on the instrument cluster and check again the tension between points A and B (see picture 1).

Verify, then, if a voltage between 6.95V and 7.05V has actually been reached. If not, decrease or increase the values of the locations until the voltage is between that range.

EEPROM 24C04 or 24C32 collocation on the PCB
Picture 2
Calculation SEPDISP08-7V

CALCULATION OF THE NEW VALUES OF THE LOCATIONS

01BF LOCATION

01CF LOCATION

*How to identify 01BF and 01CF locations values on the EEPROM

how to locate the values of the 01BF and 01CF locations on the EEPROM