Complete Hp Pavilion dv6700 Laptop Motherboard Schematic Wiring Guide
Begin by downloading the board-level repair files directly from trusted sources. The primary schematic for this model–identified by its MBID (e.g., Quanta RE5 or Wistron T71F)–is stored in password-protected archives. Common hosts include Electro-Tech-Online, BadCaps Forum, or vendor FTP servers. Extract the file using 7-Zip or WinRAR; the password is typically “badcaps.net” or “repair”.
Open the PDF in Foxit Reader or SumatraPDF to avoid rendering issues. The document contains three key sections: power distribution (DC jack → MOSFETs → VRAM), signal paths (LVDS → GPU → memory), and test points (voltage rails, BIOS pins). Cross-reference the silkscreen labels on the PCB with the annotations in the manual–mistakes here lead to misdiagnosed short circuits.
For hardware verification, use a multimeter in diode mode on critical lines: EC_RSMRST# (pin 16 on the EC), 3.3V and 5V rails, and GPU core voltage. If voltages read near zero, check the PU11 (ISL6237) VRM controller–a common failure point. Replace damaged inductors (L20, L21) with exact replacements (e.g., 1μH, 6A saturation).
Download the BIOS dump specific to your SKU (HP DV6-7xxx Rev A/B) from BiosMods or Coreboot. Flash using a CH341A programmer–avoid software tools like WinFlash, as they cannot recover corrupted ME regions. Reball the nVidia GPU (GeForce 8400M GS) only if thermal paste has failed (arctic MX-4 preferred); improper rework risks lifting pads on U23.
Store schematics offline. Print critical pages–especially the power sequence diagram–and annotate with real-time measurements. Third-party sellers often repurpose these files; verify checksums (SHA-256) against known-good uploads.
HP Notebook Motherboard Circuit Reference Guide
Download official boardview files directly from HP’s service portal by searching for model “dv6700UU” in the technical documentation section. Verified schematics include component designations (e.g., UMA1 for southbridge, PU6 for CPU VRM) and net labels matching physical PCB silkscreen.
Trace power rails using the annotated PDF: +19V input flows through PF1 fuse (3A) → PU5 charging IC (ISL6237) → PU4 DC/DC converter (TPS51125). Check PU5 pin 42 for LX_V5REG signal; absence indicates faulty inductor L33.
Critical Signal Paths
Primary GPU (NVIDIA GeForce 8400M GS) connects via 184-ball BGA package. Key nets: GPU_VCORE (pin A7), MEM_IO (pins E1-E3), and PCIe lanes routed through server-grade capacitors C450-C453 (0.1µF). Probe test points TP3 (MCLK) and TP7 (REF_CLK) for PCIe initialization.
BIOS chip (SST25VF080, 8-pin SOIC) resides near DDR2 slots. Desolder using hot air at 350°C, ensuring pin 2 (HOLD#) and pin 5 (VCC) remain undamaged. Programming requires CH341A programmer with “chip erase” disabled to preserve MAC address block.
Thermal management relies on dual LM35 temperature sensors (TXN1/TXN2). TXN1 monitors CPU die; TXN2 covers GPU heatsink. Replace R217 (47kΩ resistor) if fan control PWM drops below 2.8kHz–reported failure threshold for this circuit.
Troubleshooting Short Circuits
Locate shorts using DC power supply limited to 0.5A: apply 3.3V to suspected rails while measuring voltage drops across decoupling capacitors. Common failure points include C43 (GPU_VCORE input capacitor) and L5 (CPU core inductor). Replace both if ESR exceeds 0.05Ω.
For USB-related malfunctions, inspect U24 (GL850G hub IC). Check R312 (10kΩ pull-up resistor) on D+ line; open circuits here cause intermittent detection failures. Reball U24 if continuity tests pass but ports remain unresponsive under Linux `lsusb -t`.
Locating Authentic HP Notebook Circuit Board Blueprints
Start with HP’s corporate support portal. Log in at support.hp.com, enter the precise product code found on the device’s underside sticker – typically formatted as “Product number: XXXXX#ABA” – and check the “Maintenance and Service Guide” section. These manuals often embed detailed PCB layouts for technician reference, including component placement, voltage rails, and signal pathways.
Third-Party Schematic Repositories
Technical repair communities host verified board layouts. BadCaps.net archives service diagrams uploaded by engineers; filter by laptop model variants like dv6700t, dv6700us, or dv6700eo. Alternatively, ElektroTanya offers downloadable PDF schematics – search using the full board part number (e.g., “HP DA0AT6MB6E0 REV:E”). Both sources verify uploads with checksum tools to prevent corrupt files.
Paid schematic databases deliver higher resolution and direct download. SchematicsUnlimited requires a one-time fee but guarantees vector-based PCB drawings compatible with KiCad or Altium for re-engineering. Search using the motherboard’s HP spare parts identifier – usually etched near the RAM slots – for exact matches.
For hardware enthusiasts, disassembling the BIOS firmware can extract embedded reference designs. Use a CH341A programmer and flash dump tools like Flashrom to access the SPI chip contents. Decompile the binary with Ghidra, focusing on memory-mapped regions marked with “PCB_LAYOUT” or “SCH_REV” strings – theseoften include raw coordinate data for major power delivery ICs and GPIO multiplexing.
Critical Circuit Elements and Signal Paths in the Reference Board Layout
Trace the ATX +5VSB line first–it powers the EC (embedded controller) before system boot. On the reference board, this rail originates at the 4-pin standby connector, passes through a 10 Ω series resistor, and terminates at the EC’s VCC pin (U5, pin 48). If standby voltage is missing, measure the resistor (R214) for open traces; verify diode D9 for reverse leakage if readings exceed 5.5V. The EC then distributes power to the keyboard, touchpad, and CMOS via individual low-dropout regulators.
Check GPU core power delivery next. The MXM connector (J4) supplies the discrete GPU with two +1.1V rails (VDD_CORE) and +1.8V (VDD_IO). Each rail is protected by a 2A PolySwitch (PS201/PS202), but failures often occur at the input capacitors–two ceramic 22µF units (C230, C231) located adjacent to the GPU. Swollen or low-ESR caps here disrupt transient response, causing display artifacts. Replace both if impedance tests show values below 1 mΩ.
Voltage Rails and Common Failure Points
| Rail | Source IC | Load | Typical Failure | Test Point |
|---|---|---|---|---|
| +3.3V | ISL6237 (U10) | Memory, SATA | Short on DDR VTT | TP3, near RAM slots |
| +1.5V | APL5913 (U14) | CPU VCCPLL | No-start (U14 pin 5 stuck low) | TP101, CPU socket |
| +5V | LM2596 (U3) | HDD, USB | Thermal shutdown (U3 pin 2 > 80°C) | C301 (+), near USB ports |
Monitor the EC-to-super I/O (U22, W83627DHG) communication bus closely. The LPC bus (FWH0–FWH3) runs at 33 MHz; signal integrity collapses if termination resistors R104–R107 (47 Ω) are damaged or if the EC’s PLTRST# pin (pin 20) hangs. Probe the clock line (FWH_CLK) with a 200 MHz scope–jitter over 300 ps indicates a dry joint at the crystal (X1, 32.768 kHz). Reflow the EC if cold solder causes intermittent keyboard responses.
Isolate battery charging issues by verifying the bq24721C (U7) charge controller’s I2C lines. SDA (pin 14) and SCL (pin 15) should toggle between 3.3V and ground with 4.7 kΩ pull-ups (R90/R91). If the adapter is detected but no charging, check the ACDET pin (pin 20)–it must swing above 1.7V when a valid 65W adapter is connected. Swap the adapter IC if ACDET remains low, as internal MOSFETs (Q1/Q2) short under high-current events.
Step-by-Step Guide to Interpreting the Laptop’s Power Circuit Reference
Locate the main power connector labeled JACK or DC_IN near the edge of the board layout. Trace the thick red lines extending from this point–these represent the main +19V rail. Verify continuity using a multimeter set to diode mode; the reading should average 0.450-0.550V when probed from the jack’s outer pin to ground.
Identify the ISL6237 or equivalent power controller IC–marked by an 8x8mm QFN package with a central dot. Cross-reference its pinout with the accompanying bill of materials: VIN (pin 19) connects to the +19V rail via a 10µF ceramic capacitor, while VOUT (pin 28) feeds the CPU core. Probe these pads; absence of voltage at VOUT suggests a faulty controller or shorted downstream components.
Examine the MOSFET pairs adjacent to the controller–typically labeled Q32 and Q33. These handle high-side and low-side switching. Use a logic probe to check their gate signals; a pulsing 300kHz waveform confirms proper operation. Static high/low readings indicate a failed driver stage or corroded traces.
Isolating Short Circuits
Disconnect the battery and plug in the AC adapter. Measure resistance across the +5V_ALW rail–locate the inductor labeled L4 near the southbridge. A reading below 5Ω suggests a shorted decoupling capacitor or USB port. Remove components methodically: start with the EC34 (100µF tantalum) closest to the inductor, then re-test.
Check the +3V3_SUS rail by probing the G3 MOSFET near the memory slots. A sudden voltage drop to 0V after 2 seconds indicates a failing standby regulator. Bypass the regulator temporarily by injecting 3.3V directly via a bench supply; if the system posts, replace the APL5331 IC and its surrounding 0.1µF caps.
Inspect the AC_OK signal–trace the thin line from the power jack to the PU9 supervisor IC. This signal should toggle high (~3.3V) within 500ms of adapter insertion. If stuck low, replace the BQ24721 charger IC and verify the AC_DET resistor network (R512, R513, 100kΩ each).
Voltage Rails Verification
Power on the board and measure key rails sequentially: +5V_ALW (4.85-5.15V), +3V3_SUS (3.15-3.45V), +1.5V (1.425-1.575V). Use the silkscreen labels (e.g., PL9_3V3) to avoid confusion. Deviations >±5% indicate a failing voltage divider or unstable reference at the controller IC.
For the CPU core voltage, probe the VOUT pin of the controller while loading the system (e.g., entering BIOS). Voltages should scale between 0.8V-1.2V depending on load. If fixed at 0V or max, reflash the BIOS firmware–corrupted power states often cause undervoltage lockout. Replace the ATX450W jumper if no improvement.