LG K10 K420N - Display Issues, Backlight On but No Content, Overnight in Cold Car, New LCD

Hello
I have a problem with the LG model K420N phone.
I left him overnight in the car (it was 5 degrees outside) In the morning when I wanted to call I saw that he was turned off. I turned it on and it started up but the screen was black ...

In general, the phone turns on, you can call it but does not display anything (i.e. no content because the backlight is on). I disassembled the phone inside, you can not see traces of patina moisture, etc. My diagnosis fell on the damaged display since everything else works and the lcd connector looks nice, to be sure I cleaned it. I bought a second new one on Allegro. Today came the connected and still the same symptom. The backlight turns on but there is no content on the display.

Please help

Hello. Is the phone falling after falling? Defects caused in this way may manifest themselves after some time. The new LCD may also be out of order, such a small coincidence.

It was enough to heat the disc well and it works