Compal LA-H462P Rev 1.0 Schematic for HP Pavilion Gaming 15-dk / Omen 15-dk – Board Details & Fault Tracing

User question

LA H462P REV1.0 schematics

Artificial Intelligence Response

Direct answer to the question

• The Compal LA-H462P Rev 1.0 schematic (also labelled FPC52 LA-H462P inside the PDF) is the main-board circuit diagram used in HP Pavilion Gaming 15-dk / Omen 15-dk series notebooks (Intel 8-th, 9-th and 10-th-generation “Coffee-/Comet-Lake-H” platforms with discrete NVIDIA GTX16-series GPUs).
• The original 68-page PDF + Board-view package is copyright © Compal/HP and is therefore not distributed freely.
• You can obtain a legal copy through:
  • HP authorised service partners or HP Parts Store (request the “Quanta/Compal LA-H462P R1.0 system board schematic”).
  • Paid repositories such as NotebookSchematics, RealSchematic, HNFix, or Dr-BIOS (typically USD 15-25, sometimes bundled with the .BDV/ .CAD board-view).
  • Peer-to-peer repair communities (e.g. Badcaps, Vinafix, AlexLaptopRepair) after registering and complying with their copyright policy.

Detailed problem analysis

1. Main architecture (derived from the schematic)
   • CPU + PCH: Intel Coffee-/Comet-Lake-H BGA1440 (i5-9300H, i7-9750H, i5-10300H, etc.) with external HM370/HM470 PCH inside the same package.
   • dGPU: NVIDIA N18P-G61 / N18E-G1 (GTX 1650/1660Ti Max-Q) on MXM-A-like discrete footprint.
   • EC/KBC: ENE KB9022Q-D or ITE IT8987E (power-sequence master, keyboard scan, fan control).
   • Charger/Power-path: TI BQ24780S (19 V adaptor/BAT multiplex, ACDRV gate drive for dual N-MOSFETs PQ101/102).
   • “Always-On” rails: 3 V/5 V generated by Richtek RT8223L (PU401) with VLDO3/5 feeding the EC.
   • Main VRMs:
   – VCC_CORE multi-phase, OnSemi NCP81239 controller + Sinopower/Alpha-Omega MOSFETs.
   – VCC_GFX (if dGPU disabled) or VCC_GT (if iGPU only) single-phase.
   – VCCSA, VCCIO, DDR4 VDDQ 1 V2 rails from RT8120B buck converters.
   • Audio: Realtek ALC236-CG codec.
   • LAN: Realtek RTL8168DP.
   • USB-C/DP-Alt-mode: Parade PS176 or TI HD3SS3220 + TUSB1046A.
   • DC-Jack: 4-pin 19.5 V with centre-pin ID to EC (AD_ID).

2. Typical fault-finding flow with the schematic
   Step-by-step (measure with multimeter/oscilloscope):
   a) 19 V present at DC-jack → across PF101 (2 A fuse) → PQ101/102. Check ACDRV ≈ 25 V.
   b) +3V_ALW / +5V_ALW on PL401 / PL402. If missing, suspect PU401 or shorted MLCC.
   c) EC VCC3, 32.768 kHz crystal oscillation, then SPI /CS, CLK bursts on Winbond 25Q128JVSQ BIOS.
   d) PWR_BTN# low pulse → EC asserts S5_ON → SUS_ON → +1.05 V_PCH, +1.8 V_AUX, etc.
   e) VRM enable signals VR_ON, SVID bus traffic → VCORE ramps to 0.8–1.2 V.
   f) dGPU: +VGA_CORE ≈ 0.8 V, +VDDQ ≈ 1.35 V; verify presence only when NVIDIA chip populated and dGPU_EN high.

3. Cross-check of board identity
   • Silkscreen on PCB: “LA-H462P Rev:1.0 (FPC52)”.
   • HP spare part numbers: L51957-601, L51956-601, L71031-601 (vary with CPU/GPU).
   • If your board is Dell Inspiron 3583/3584/3781 you probably have LA-G078P / LA-G081P, not LA-H462P. Confusion in some offline sources stems from similar Compal numbering.

Current information and trends

• HP/Compal still ship derivative Rev 1.1/1.2 boards with Tiger-Lake-H35, but schematics are not yet publicly leaked.
• Growing number of repair portals now embed searchable PDFs with netname index, accelerating diagnosis.
• Right-to-Repair legislation (EU 2023/ CEE, US states) may make OEM schematics more accessible in future laptop generations.

Supporting explanations and details

Voltage rail naming convention: suffix “_ALW” = Always, “_S5” = Standby, “_S0” = runtime. Signal names ending “#” are active-low.

Example measurement table (power-on, adapter only):

Net	Expected	When present	Notes
+19VIN	19–20 V	Immediately	At PQ102 drain
+3V_ALW	3.25–3.35 V	< 100 ms	Feeds EC
+5V_ALW	5.05–5.15 V	< 100 ms	LCD backlight enable later
SUS_ON	3.3 V	After PWR_BTN#	Enables secondary bucks
VCORE	0.8–1.2 V	< 300 ms	CPU load-line, oscilloscope to verify ripple <20 mVpp

Ethical and legal aspects

• Schematics are protected by copyright; re-distribution without rights is illegal in most jurisdictions.
• Some “free” downloads harbour malware or altered data—verify SHA-1 hash against trusted copies.
• When working on Li-ion powered systems follow IEC 62133 and OEM battery-disable procedures to avoid thermal events.

Practical guidelines

Obtaining the document legally

1. Open an HP commercial support ticket—provide notebook serial, request “service diagnostic schematic”.
2. Join a recognised repair forum, contribute, and request the file in a private message (many forums operate on a credit/karma basis).
3. Purchase from a professional repository (ensure watermarking does not obscure net names).

Using the schematic efficiently

• Pair it with a matching Board-view (.BDV) in OpenBoardView, FlexBV, or OrCAD Allegro Free Viewer.
• Annotate measured voltages directly in the PDF (Xodo, Foxit) for future reference.
• Print the power-tree page and mark each good rail in green, missing rail in red—quick visual aid.

Common challenges & mitigation

• Missing rails: inject 1 V @ 2 A via lab PS into suspect rail through the inductor; use thermal camera to locate hot shorted MLCC.
• Corrupted BIOS: use CH341A or RT-809H programmer, verify against clean dump (available on same sites as schematic).

Possible disclaimers or additional notes

• Component values & reference designators occasionally differ between GTX 1650 and GTX 1660Ti variants; always match PCB silkscreen to schematic page header (e.g. “FPC52-A” vs “FPC52-B”).
• Some copies on the web are draft Rev 0.9 (67 pages) lacking the USB-C retimer page—use Rev 1.0 or later.

Suggestions for further research

• Study Intel’s public “Coffee-Lake-H Platform Design Guide” to correlate HP’s net names with Intel reference rails.
• Explore open-source tools such as LiquidCrystal-OBV for annotated interactive probing.
• Monitor iFixit, Repair.org, and EU Right-to-Repair dossiers for pending legislation that may mandate open schematic release.

Brief summary

The LA-H462P Rev 1.0 schematic belongs to HP’s Pavilion Gaming 15-dk / Omen 15-dk family, not Dell Inspiron. It is a 68-page PDF that details the 19 V input, BQ24780S charging path, 3 V/5 V always rails, EC power sequence, multi-phase CPU VRMs, and dGPU subsystems. Because it is copyrighted, you must obtain it either through HP service channels or reputable paid/peer repositories. Once acquired, combine it with a board-view file for efficient troubleshooting—verify VIN, ALW rails, EC activity, and VRM enables sequentially to diagnose typical “no-power”, “boots-then-off”, or “black-screen” faults.

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