thanks for reply.
As you said i adjusted trimpot wiper but screen back led brightness is not effecting.
Ok. i will re-wire as per ur suggestion. VEE---V0__GND
Should i increase pot value from 10k to 20k or 50k?
Manufacture of Display suggest that
a). Take care of VEE which generate -ve voltage (Around -15 v to -25v) am getting -23.8v. Means Display is Healthy.
b). Trimpot use 20k to avoid accidental low voltage to VEE pin which cause damage of Display.
c). Time delay should be match with controllers time delay at time of initialization. ( how to check and confirm this point)?
Anyway i will change the connection and try first. If it not works i will increase the trimpot value.
AT LEDA pin am getting 4.9V even if i not connected anywhere. So should i connect to 5v or leave the connection as free.?
--Nikhil