Replace the main board (located at the bottom of the front end of the machine, replace the chassis)

operating steps

Turn off the machine (graph 317)

                                                        graph 317

Open the bottom cover of the main board (graph 318)

                                                        graph 318

Remove 4 fixing screws of the main board (Fig. 319,320,321,322)

                                                        graph 319

                                                        graph 320

                                                        graph 321

                                                        graph 322

Disconnect all line interfaces on the main board (you can take photos and record the corresponding interfaces of the line in advance to avoid replacing the wrong connection line) (graph 323)

                                                        graph 323

Disconnect the wifi wire interface (graph 324)

                                                        graph 324

Remove the chassis floor with 12 screws (Fig. 325,326,327,328)

                                                        graph 325

                                                        graph 326

                                                        graph 327

                                                        graph 328

                                                        graph 329

Disconnect wire wire interface (graph 330)

                                                        graph 330

Cut the tie band (graph 331)

                                                        graph 331

With a new mainboard (graph 332)

                                                        graph 332

Install 4 fixing screws on the main board (Fig. 333,334,335,336)

                                                        graph 333

                                                        graph 334

                                                        graph 335

                                                        graph 336

Link all line interfaces, please refer to the detailed motherboard diagram (graph 337, graph 338)

                                                        graph 337

                                                        graph 338

Install 12 screws on bottom cover of chassis (graph 339)

                                                        graph 339

Install the motherboard bottom cover (graph 340)

                                                        graph 340