Dell Alienware M15 R4 2 Red 7 Blue Display Failure

[sikocan]

Laptop model: Dell Alienware M15 R4 S/T: 346w5j3
Motherboard model: LA-K741P REV 1.0

Problem description:
Turns on with error code on the LED light: 2 Red. 7 Blue. Indicating Display Failure.

Following attempts are made at repairing:
1. Replace LVDS cable
2. Replace LVDS connector on motherboard, 3 times.
3. Replace LCD screen with same 300Hz version + 240Hz version
4. Power on with battery alone or DC jack
5. Checked Voltages on the LVDS connector with and without screen connected, it was pretty much the same.
6. BIOS updated completed

Observations:
If HDMI is plugged for external display, laptop boots fine without an error code.
Holding D while booting shows LCD colours and LCD testing.
I have throughly checked for burns or damaged components, it looks good.

You can watch extensive boring videos of the issues so far here:
https://youtu.be/mvt-ueqcrKQ Part 1 No ads
https://youtu.be/s7y0nSuWd6Q Part 2 No ads

Attached are the LVDS connector readings + snippets from the schematics files which may assit you.

Thank you in advance.

[sikocan]

Re: Dell Alienware M15 R4 2 Red 7 Blue Display Failure

Attached is the boardview for those interested.

MOD Edit: Boardview moved to thread in "Schematic requests ONLY!" sub forum -> https://www.badcaps.net/forum/showthread.php?p=1264783
Reminder, rules and organization of this section -> https://www.badcaps.net/forum/showthread.php?t=117483


Here are some interesting finds.
When I connected 3.3VAW to Pin 1 of the FV8 - the 2nd pin of FV8 became 2.4V. Then I connected a wire from 3.3VAW source to Pin 1 and Pin 2 of FV8 - I had 3.3V altogether. The FV8 is good - no issues.
LCD Display error still showed.

ENVDD comes from UG65 as pictured. UG66 Pin 5 has it;s +3VS signal. But No V on Pin 1 and Pin 2 which are NDDS_ENVDD and DDS_ENVDD.

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