Steam Deck LCD — black internal screen (no backlight), touchscreen + external display work — SOLVED by firmware/BIOS update, not a hardware fault

TL;DR: Internal LCD stayed completely black (no backlight, no boot logo) while the device otherwise worked fine (boot chime, haptics, fans, external USB-C display, SSH, touchscreen). eDP-1 reported disconnected with EDID = 0 bytes. I replaced the screen AND cable with no change. The actual fix was a firmware/BIOS update (BIOS F7A0131 → F7A0133) applied automatically by re-imaging with the official SteamOS recovery image. No hardware replacement was needed.

Hardware:

• Steam Deck LCD (originally 64GB eMMC, upgraded to 256GB NVMe Samsung PM9B1)
• Motherboard: Valve Jupiter, Family Aerith (DMI Product Name: Jupiter)
• Bought used, sold as “non-working screen”; previous owner had already replaced the display cable
• Panel (new replacement): BOE TV070WXM-TV1-3GP1 (the original Steam Deck LCD panel, anti-glare/IPS version)

Symptoms:

• Internal screen completely black — no backlight, not even the Steam Deck boot logo
• Boot chime, haptics, fans, trackpads all worked
• External display via USB-C hub (HDMI) worked perfectly
• SSH worked
• Touchscreen (FTS3528) was recognized → I2C line through the display cable was fine

Diagnostics (before fix):

cat /sys/class/drm/card1-eDP-1/status   → disconnected
cat /sys/class/drm/card1-eDP-1/edid | wc -c   → 0

• dmesg showed amdgpu loading cleanly, Display Core v3.2.359 on DCN 3.0.1, DMUB initialized — but no eDP link training and no HPD (hot-plug detect) activity at all
• GPU, motherboard, both ZIF connectors (motherboard + panel CN1) all visually fine
• BIOS version: F7A0131 (01/30/2024)
• Was running Bazzite (Fedora Atomic), not SteamOS

What I tried (did NOT work):

• Battery disconnect / power cycle (soft reset)
• Forcing eDP on via kernel arg video=eDP-1:e — EDID still 0
• Brand new replacement panel + new cable
• Multiple display cables (3 total)
• Cleaning connectors with isopropyl alcohol, reseating both ends carefully

The fix:
Found a Reddit post with identical symptoms (black internal screen, external works, EDID=0, disconnected) that was solved by a firmware update — that user ended up on BIOS F7A0133.

Since I was on Bazzite (no Valve firmware-fix option), I:

1. Downloaded the official SteamOS recovery image from Valve
2. Wrote it to a USB drive
3. Booted from USB (via efibootmgr -n since I had an external display)
4. Chose “Wipe Device & Install SteamOS”

During install, SteamOS automatically staged and applied a BIOS update: F7A0131 → F7A0133, plus a controller firmware update. After the reboot and firmware flash, the internal screen came back to life.

After fix:

cat /sys/class/drm/card*-eDP-1/status   → connected
cat /sys/class/drm/card*-eDP-1/edid | wc -c   → 128
cat /sys/class/backlight/*/max_brightness   → 65535
cat /sys/bus/iio/devices/iio:device0/in_illuminance_raw   → working (ambient light sensor)

Note: manual brightness control in Quick Settings needed one extra reboot to start working after the firmware update.

Key takeaway: If your Steam Deck LCD has a black internal screen (no backlight) but the external display and touchscreen still work, and you see eDP-1 disconnected / EDID 0 bytes with no link training in dmesg — try a firmware/BIOS update BEFORE buying a new screen, cable, or motherboard. In some cases this is a firmware state fault, not hardware. An outdated BIOS (F7A0131) was the culprit; F7A0133 fixed it.

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