When you find your BMW NBT unit without communication or after programming die,it always show you with “No Signal” error.So this guide show you how to solve BMW NBT unit No signal.More BMW NBT cases,please refer to BMW NBT Projects.
Write new data file to the character library chip
Remove 4 resistance and triode behind the PCB.
There are two types character library chips,large and small.
Large character library chip without triode.
Use programmer to read the data from character library chip,then write new data into the chip
If the NBT unit with blue or black screen by programming failure,you need to write GL512 character library data.