MacBook Pro powers on, but display is black.

This happened out of the blue. Screen went black and I haven’t been able to get it to come back on.

Prerequisites:

• No liquid damage
• No drops/impacts recently
• Nothing out of the normal leading up to the issue
• Capslock key lights up
• Charging sound when cable is plugged in
• Trackpad clicks
• No keyboard backlight
• No startup chime

What I’ve tried:

• SMC Reset
• PRAM Reset
• Removed bottom cover and reseated battery connectors and other connectors that were easily removed. Nothing looked out of the norm.
• Booted laptop without battery connected using AC adapter

What I haven’t tried:

• Plugging into my own external display .

Apple’s brief diagnosis:

• Nothing shows on external display
• Likely logic board
• $500 to replace logic board

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Any suggestions would be greatly appreciated. A $500 repair is not in the budget right now. Thanks!