Hold the D key through powerup. That'll trip a screen self-test -- you should see a series of alternating color screens. If you don't, the LCD is toast and needs to be replaced.
If you do see the self-test, the problem could be as simple as a detached or damaged wiring harness (it connects to both the mainboard and back of the display). If the cable is OK, then the mainboard is faulty - to determine which, extensive disassembly is required. If you need to know how to do this, post thee full model number (i.e., XPS L502x, Inspiron N5110, etc.).
ejn63
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September 13th, 2017 17:00
Eight beeps means no display panel is detected.
Hold the D key through powerup. That'll trip a screen self-test -- you should see a series of alternating color screens. If you don't, the LCD is toast and needs to be replaced.
If you do see the self-test, the problem could be as simple as a detached or damaged wiring harness (it connects to both the mainboard and back of the display). If the cable is OK, then the mainboard is faulty - to determine which, extensive disassembly is required. If you need to know how to do this, post thee full model number (i.e., XPS L502x, Inspiron N5110, etc.).