Working solution for Lexia PP2000 is no longer recognized on USB port

This post starts with user’s real problem on Lexia PP2000 that no the interface is no longer recognized on USB port, then followed by the analysis on this problem and working solution, as well as Trouble shooting Description. Hope it helps!

The problem:
When connecting to the USB port, the card is recognized and detected with USB com board driver. After flash spi flash (Winbond W25Q80B) for changing the serial number and flash MB90F546GS microprocessor with SCARY file for recognition in EVOLUTION driver; the interface is no longer recognized on USB port ????? After re-reading the SPI flash, this one is empty ???

Finally, I found the problem on this interface (more precisely on the microprocessor MB90F546GS board).

Missing +Vcc on the pull-up resistor 3.9 Kohms, inner track probably cut …
Setting up a wire to bring the +Vcc on the pull-up resistor.
lexia problem-01
lexia problem-02
Trouble shooting Description:
After changing many components, among other SPI flash, HA86, Micro MB90F546GS … etc, I have come to think of a concern for missing pull up resistor or a problem on a layer track internal …
Indeed, the return signal for communication between pin 2 (DO: data output) of the spi flash W25Q80B and pin 28 (P50 / SIN2: Serial data input) of the microprocessor MB90F546GS fact it through two logic circuits: a ACHT86 and HB125; in order to change the logic state and complicate the task of reverse engineering.
lexia problem-03
Hoping that this could be used for other …


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