: For physical disassembly, refer to the Dell Chromebook 3100 Service Manual , which details the removal and installation steps for this specific board.
Use the schematic to find the VCC pin on the BIOS chip (usually Pin 8). If there is no voltage here, the board will never boot. la-g851p schematic
| Page | Component / Section | IC / Part Number | Notes | |------|---------------------|------------------|-------| | 1 | Block Diagram | -- | Overall power/clock/reset flow | | 4 | Embedded Controller | IT8987E (KB9022 compatible) | ROM-less; EC firmware is in SPI flash | | 8 | PCH (SR30W / SR3EB) | Intel Kaby Lake-H | +1.0V_VCCPCH, +1.8V_VCCPCH | | 10 | CPU Core VR | PU901: NCP81215 | DrMOS (NCP81252) for phases | | 20 | DDR4 RAM | VDDQ = 1.2V, VPP = 2.5V, VTT = 0.6V | PU1001: RT8230A | | 28 | GPU VR | PU701: NCP81276 | 3-phase for GTX 1050/Ti | | 34 | Audio Codec | ALC3246 | Headset jack & internal speakers | | 40 | USB Type-C / PD (if present) | TPS65982 or similar | Not present on all LA-G851P variants | : For physical disassembly, refer to the Dell
Uses a specific high-density connector. Issues often result from loose battery cables or damaged pins. | Page | Component / Section | IC
: The Dell Chromebook 3100 Service Manual provides step-by-step disassembly, screw lists, and component identification.
After repairing hundreds of these boards, three failures dominate. Here is how the schematic helps solve them.
Because these boards are for education-focused Chromebooks, they are frequently replaced rather than repaired. You can find "pulled" or new replacement boards on marketplaces like AliExpress and eBay .