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HP Pavilion dv6636 (dv6500) Screen is totally black. Machine boots up and displays on external monitor just fine.
Have checked the Inverter - no change. Did a hard reset (battery out, power cord out, power button held 40 sec., no change.

what am I missing ? I'd hate to have to dissemble this much further. Can recover/access my data and back it up.
Thank you.

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Adding a short, targeted troubleshooting path to pick up where the thread left off. With some front-line checks already done and noting thermal causes as a possibility, the next steps should concentrate on isolating the display assembly, the display cable/connector, and the board-level display power/driver circuits.

  1. Flashlight test — in a dark room hold a bright flashlight very close to the screen at a shallow angle. If you can make out a faint image (desktop or BIOS text) the LCD itself is working and the problem is the backlight or its driver.
  2. Reseat and inspect the cable — remove the bezel, unplug the LVDS/eDP cable at both ends, and inspect the cable where it passes the hinge for frays, pin damage, or crushed wires; a damaged cable is a common silent failure.
  3. Panel vs cable swap — if a donor cable or panel is available, test with it before buying parts. Always copy the exact part number from the sticker on the back of any replacement panel.
  4. Check low-voltage rails and fuses (only if comfortable) — measure the 3.3V/5V/12V rails at the display connector and check the inverter/input fuse on CCFL models. Do not probe inverter high-voltage outputs.
  5. Board-level suspects — if panel and cable pass tests, the fault is likely the LVDS/eDP driver or display-power circuitry on the motherboard; look for swollen caps, burn marks, or cracked solder.

Safety and practical tips: use ESD precautions, remove battery/power before extensive disassembly, document connector orientations with photos, and avoid probing high-voltage inverter outputs. Buy replacement parts from sellers that accept returns or test-before-you-buy; a used donor is often the cheapest way to confirm the faulty component. If these steps do not localize the fault, a shop with a scope/meter can trace the display power lines faster than swapping multiple expensive parts.

Member Avatar for albakirtrading

Most probably your system has over heated.Your CPU fan might be the reason.check the fan and replace it

Member Avatar for Nanci252

according to speed fan and cpuz it's well within the heat levels reccom. Cleaned entire internal areas with canned air, and light brush where req'd.
Tested lcd and cannot get response on test machine, so researching new lcd and cable.
thank you tho. i appreciate all the help I can get.

Edited by Nanci252
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