Blu Studio J1 - Signal and Display Problems

Start
Upgrade to latest
software
YES
OVER
No
Check the main
antenna and
Antenna spring
No
YES
If unconnected,
damaged, replace a
new one
Check coaxial line
YES
If line connector
opened, reconnect
it. If line damaged
or circuit opening,
replace a new one.
Replace Main PCBA
No
No signal
No Display or Display issue
Start
Check if it is
power issue
YES
Go to power
issue
No
1.Check software version?
2.LCD defective?
No
YES
Update software
or change A-
cover Assy
Replace Main PCBA
Check
Connector J0901
no damage
YES
Change J0901
No