Dell Inspiron 14 5420 Service Manual

Also see for Inspiron 14 5420: Setup and specifications

5. Remove any media card and optical disk from your computer, if applicable.6. Enter the service mode, if you are able to power on your computer.Service ModeService Mode is used to cut-off power, without disconnecting battery cable from system board prior conducting repairs inthe computer.CAUTION: If you are unable to turn on the computer to put it into Service Mode or the computer does notsupport Service Mode then proceed to disconnect the battery cable. To disconnect the battery cable, followthe steps in Removing the battery.NOTE: Ensure that your computer is shut down and the AC adapter is disconnected.a. Hold key on the keyboard and press the power button for 3 seconds or until the Dell logo appears on the screen.b. Press any key to continue.c. If the AC adapter is not disconnected, a message prompting you to remove the AC adapter appears on the screen.Remove the AC adapter and then press any key to continue the Service Mode procedure. The Service Mode procedureautomatically skips the following step if the Owner Tag of the computer is not set up in advance by the user.d. When the ready-to-proceed message appears on the screen, press any key to proceed. The computer emits three shortbeeps and shuts down immediately.e. Once the computer shuts down, it has successfully entered Service Mode.NOTE: If you are unable to power on your computer or unable to enter service mode skip this process.Radiation Exposure StatementThis device meets the government's requirements for exposure to radio waves.This device is designed and manufactured not to exceed the emission limits for exposure to radio frequency (RF) energy set bythe Federal Communications Commission (FCC) of the U.S. Government.The exposure standard for wireless device employs a unit of measurement known as the Specific Absorption Rate, or SAR. TheSAR limit set by the FCC is 1.6 WNOTE: Tests for SAR are conducted using standard operating positions accepted by the FCC with the device transmittingat its highest certified power level in all tested frequency bands.Electrostatic discharge—ESD protectionESD is a major concern when you handle electronic components, especially sensitive components such as expansion cards,processors, memory DIMMs, and system boards. Very slight charges can damage circuits in ways that may not be obvious, suchas intermittent problems or a shortened product life span. As the industry pushes for lower power requirements and increaseddensity, ESD protection is an increasing concern.Due to the increased density of semiconductors used in recent Dell products, the sensitivity to static damage is now higher thanin previous Dell products. For this reason, some previously approved methods of handling parts are no longer applicable.Two recognized types of ESD damage are catastrophic and intermittent failures.● Catastrophic – Catastrophic failures represent approximately 20 percent of ESD-related failures. The damage causesan immediate and complete loss of device functionality. An example of catastrophic failure is a memory DIMM that hasreceived a static shock and immediately generates a "No POST/No Video" symptom with a beep code emitted for missing ornonfunctional memory.● Intermittent – Intermittent failures represent approximately 80 percent of ESD-related failures. The high rate ofintermittent failures means that most of the time when damage occurs, it is not immediately recognizable. The DIMMreceives a static shock, but the tracing is merely weakened and does not immediately produce outward symptoms related tothe damage. The weakened trace may take weeks or months to melt, and in the meantime may cause degradation of memoryintegrity, intermittent memory errors, etc.The more difficult type of damage to recognize and troubleshoot is the intermittent (also called latent or "walking wounded")failure.Perform the following steps to prevent ESD damage:Working inside your computer 7