Black Display after drop
I dropped my Lumia 920 from above 2 feet but it has no sign of crack or break. It looks perfectly normal. After the drop, display suddenly turned black. All other function work like I can accept call, call people using voice command, open app, Flashlight, can take photo, I can also enter lock key guessing digits position correctly. I soft reset the phone several times but no luck. I did a self test using Product support tool and only thing that fails is Display self test. I am wondering now what is broken because there is no visible sign. Is it LCD thats not working or something in motherboard. Are there other connection point to board from display other that a flex cable that connects to board?
Result from self test
Display self test
Tests the display chip, panel interfaces and panel bist test.
Result (detailed view):
IOCTL request (PANEL_INTERFACE_TEST) failed
Detailed self test result:
The failure bits for PANEL_INTERFACE_TEST are:\n"
bit 00 0000 0001 : SELF_TEST_HW_FAIL_CONTROL - Fail in communication
bit 00 0000 1000 : SELF_TEST_HW_FAIL_RESET - Reset line malfunction
bit 00 0001 0000 : SELF_TEST_HW_FAIL_DSI01 - Data line 0 fail
bit 00 0010 0000 : SELF_TEST_HW_FAIL_DSI23 - Data line 1 fail
bit 00 0100 0000 : SELF_TEST_HW_FAIL_DSI45 - Data line 2 fail
bit 00 1000 0000 : SELF_TEST_HW_FAIL_DSI67 - Data line 3 fail
bit 01 0000 0000 : SELF_TEST_HW_FAIL_DSICLK - Clock line fail
bit 10 0000 0000 : SELF_TEST_HW_FAIL_TE - TE line fail
The failure bits for PANEL_BIST are:
bit 00 0000 0001 : SELF_TEST_HW_FAIL_CONTROL - Communcation malfunction
bit 00 0000 0011 : SELF_TEST_HW_FAIL_BIST - Display panel self diagnostics noticed an error
Selftest is executed by the panel driver which checks that the communication with the
display panel works correctly. A separate build-in selftest is also run to verify that
everything in the display is functioning correctly.