BarnacleBoy
3c11190822
- docs/sbc-selection.md: full rewrite for OPi 3B specs (RK3566, 8GB, 256GB eMMC, built-in WiFi) - README.md: SBC description, checklist, components table, quick ref, cost estimate - docs/parts-list.md: SBC marked purchased, eMMC/controller/WiFi changes - docs/design-decisions.md: WiFi exclusion reason, native eDP, power input - docs/salvage-analysis.md: WiFi card not needed, cooling fan, summary tables - docs/storage-architecture.md: rewritten for 256GB eMMC primary boot - docs/usb-expansion.md: 2x USB3 native, port allocation, power budget - docs/port-layout.md: OPi3B port differences (eDP, power-only USB-C, built-in WiFi) - docs/power-system.md: lower power draw context
197 lines
No EOL
4.8 KiB
Markdown
197 lines
No EOL
4.8 KiB
Markdown
# Salvage Analysis: ASUS K501U
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**Source:** ASUS K501U laptop with failed motherboard
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**Goal:** Extract usable components for cyberdeck build
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---
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## Display Panel
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### Identification
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|Attribute | Value |
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|----------|-------|
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| Model | Innolux N156HGE-EAB (Rev. C2) |
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| Size | 15.6" diagonal |
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| Resolution | 1920×1080 (FHD) |
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| Interface | 30-pin eDP |
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| Backlight | LED |
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| Panel type | IPS |
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### Verification Process
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1. Removed bezel clips (plastic tabs around screen edge)
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2. Located panel sticker on back of LCD assembly
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3. Confirmed model number: N156HGE-EAB
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4. Verified 30-pin connector (not 40-pin, not LVDS)
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### Compatibility
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**Standard eDP controller boards work with this panel.**
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Search terms:
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- "N156HGE-EAB controller board"
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- "30-pin eDP to HDMI"
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- "LCD controller board 15.6"
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**Cost:** ~$24 (Amazon/eBay/AliExpress)
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### Notes
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- Panel is in good condition, no scratches or dead pixels
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- Keep original bezel and frame for mounting
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- Hinge mechanism intact - useful for clamshell design
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---
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## Storage
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### Original Configuration
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The K501U had an M.2 NVMe SSD installed.
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**Status:** Owner already removed and repurposed. Now in a USB enclosure serving as external drive.
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**Not available for this build.**
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### RAM
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| Attribute | Value |
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|-----------|-------|
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| Type | DDR3L (low voltage) |
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| Speed | 1600 MHz |
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| Location | Soldered onboard (no SODIMM slot populated) |
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| Capacity | 8GB (varies by SKU) |
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**Not reusable:**
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- DDR3L is incompatible with modern SBCs (DDR4/DDR5)
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- Soldered to motherboard, not a removable DIMM
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- K501U base model has empty SODIMM slot but uses soldered RAM
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---
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## WiFi
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### Original Card
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| Attribute | Value |
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|-----------|-------|
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| Model | Intel 7265NGW |
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| Form factor | M.2 2230 |
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| Interface | M.2 E-key |
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| Protocols | 802.11ac, Bluetooth 4.0 |
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### Reusability
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**Not needed — OPi3B has built-in WiFi 5 + BT 5.0.**
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The Intel 7265NGW card is not required because the Orange Pi 3B has integrated WiFi and Bluetooth. The K501U's dual-band antenna (U.FL connectors embedded in the hinge) may still be useful — it could be adapted to the OPi3B's onboard WiFi for better signal than the built-in PCB antenna.
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### Workaround
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Not needed for WiFi — built-in covers it. If the K501U antenna can be adapted (U.FL to IPEX connector), it may improve reception over the OPi3B's onboard antenna.
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---
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## Other Components
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### Webcam
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| Attribute | Value |
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|-----------|-------|
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| Location | Embedded in display bezel |
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| Interface | USB (internal cable to motherboard) |
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| Connector | Proprietary pinout |
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**Potential reuse:**
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- Can be extracted with bezel
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- Requires USB pinout identification
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- Standard webcam protocol (UVC) likely supported
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- May need adapter cable
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### Cooling Fan
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| Attribute | Value |
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|-----------|-------|
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| Type | Blower fan with heat pipes |
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| Interface | 4-pin PWM |
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| Connector | Standard laptop fan connector |
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**Potential reuse:**
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- Could cool Orange Pi 3B (with PWM adapter)
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- RK3566 runs cooler (~3-5W) than RK3588 — passive heatsink may suffice
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- Blower fan may be overkill but provides headroom
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### Keyboard/Trackpad
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| Attribute | Value |
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|-----------|-------|
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| Keyboard | Integrated PCB, proprietary connector |
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| Trackpad | Precision trackpad, proprietary connector |
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**Not reusable:**
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- Proprietary motherboard connectors
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- No standard USB interface
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- Requires significant reverse engineering
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### WiFi Antenna
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| Attribute | Value |
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|-----------|-------|
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| Location | Embedded indisplay hinge |
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| Type | Dual-band antenna |
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| Cable | U.FL connectors |
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**Reusable with USB WiFi dongle:**
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- Antenna can be connected to compatible dongle
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- U.FL to SMA adapter cable needed
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- Good signal reception quality
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### Hinge Mechanism
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| Attribute | Value |
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|-----------|-------|
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| Type | Dual-hinge laptop hinge|
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| Condition | Intact, smooth operation |
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| Mount | Metal frame attached to display |
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**Useful for cyberdeck:**
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- Natural open/close mechanism
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- Can support display weight
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- Mounting points for base
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---
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## Summary
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### Direct Reuse
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| Component | Effort | Value |
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|-----------|--------|-------|
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| **Display** | Low (with controller or native eDP) | High |
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| **Hinge** | Low | Medium |
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| **WiFi antenna** | Low (with adapter to OPi3B onboard WiFi) | Low |
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### Not Reused
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| Component | Reason |
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|-----------|--------|
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| SSD | Already repurposed |
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| RAM | Wrong generation |
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| WiFi card | OPi3B has built-in WiFi+BT |
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| Keyboard/trackpad | Proprietary connectors |
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| Motherboard | Failed |
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### New Components Needed
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| Component | Estimated Cost |
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|-----------|----------------|
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| eDP controller board | $24 (may be optional — OPi3B has native eDP) |
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| SBC (Orange Pi 3B) | $189 (purchased) |
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---
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## Reference
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- Panel datasheet: Innolux N156HGE-EAB product brief
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- K501U teardown: Standard ASUS budget laptop construction
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- Orange Pi 5 specs: orangepi.org |