LENOVO IDEAPAD SLIM 3 | NO BACKLIGHT PROBLEM | 100% SOLVED

RKLC Repair Knowledge

6 Nov 202107:42

Summary

TLDRThe video script discusses a technical issue with a Lenovo laptop, where the display input is not visible on the screen despite being received by the channel. The narrator demonstrates the problem and proceeds to troubleshoot by opening the laptop, disconnecting the battery, and inspecting the display connections. They check for proper voltage supply and identify potential issues with the display cable and capacitor. The video aims to guide viewers through the process of diagnosing and potentially repairing the laptop's display problem.

Takeaways

😕 The Lenovo laptop has a display issue where the channel comes in but doesn't appear on the screen.
🔍 Upon close inspection, the screen appears dimmer, indicating a potential backlight issue.
🛠 The user is attempting to resolve the problem by opening the laptop and disconnecting the battery for further inspection.
🔌 There is a visible factory defect in the laptop, which might be related to the display issue.
💻 The display cable appears to be damaged, which could be the cause of the display problem.
🔋 The laptop's power supply is checked to ensure it's providing the correct voltage to the screen.
🔍 The script mentions checking for any loose connections or damaged components that could affect the display.
🔌 The user discusses the possibility of a faulty backlight inverter, which is crucial for screen illumination.
🛠 The repair process involves checking and potentially replacing the damaged display cable and inverter.
🔄 The script describes a methodical approach to troubleshooting, including checking for proper voltage supply and connections.
👨‍🔧 The user mentions that despite replacing the screen, the problem persists, indicating a need for further diagnosis.

Q & A

What is the main issue with the Lenovo laptop mentioned in the script?
-The main issue is that the display is not working properly. The channels are coming on, but the screen is dimmed and not showing the content clearly.
What is the first step the technician takes to troubleshoot the laptop?
-The first step is to open the laptop and disconnect the battery to ensure there is no power supply while troubleshooting.
What does the technician observe about the display's backside connection?
-The technician observes that the display's backside connection appears to be damaged, indicating a possible factory defect.
What is the purpose of checking the 3.3 volts supply to the screen?
-The purpose is to ensure that the screen is receiving the correct voltage supply, which is necessary for its proper functioning.
What is the significance of the 0.2 ohms resistance mentioned in the script?
-The 0.2 ohms resistance is being checked to ensure that the correct resistance is present in the circuit, which is crucial for the proper functioning of the display.
What does the technician do after noticing the screen's dimness?
-The technician decides to perform a thorough check of the screen's connections and the components related to the display function.
What is the possible reason for the screen's backlight not working properly?
-The possible reason could be a damaged or improperly connected backlight circuit, or a problem with the voltage supply to the backlight.
What does the technician suggest as a potential solution to the problem?
-The technician suggests that the issue might be resolved by repairing or replacing the damaged components related to the display.
What is the role of the 'MP f-35' mentioned in the script?
-The 'MP f-35' seems to be a reference to a specific part or model number, possibly related to the display or a component within the laptop.
What does the technician conclude about the laptop's condition after the checks?
-The technician concludes that there is a problem with the laptop's display connections or components, which needs to be addressed to fix the issue.
What is the final step the technician takes in the script?
-The final step is to reassemble the laptop after the checks and tests, and to confirm whether the issue has been resolved.

Outlines

00:00

💻 Laptop Display Issue Troubleshooting

The speaker describes a problem with a Lenovo laptop where the display is not showing the channel that is being broadcasted. They mention that the backlight is dimmed and the screen is not receiving the proper signals. The speaker then proceeds to open the laptop to check the connections and components, including the display cable and the power supply to the screen. They also discuss checking the voltage supply and the capacitors, indicating that the issue might be related to the screen's backlight or power circuitry.

05:01

🔍 Further Investigation of Laptop Display Failure

In this paragraph, the speaker continues to investigate the laptop's display issue. They mention checking the connections and noticing that there are no signals coming through, suggesting a potential problem with the display's data path. The speaker also talks about the possibility of a fuse being blown and discusses the symptoms that occur when the laptop is under stress, such as during gaming or when the display is subjected to high brightness. They conclude by suggesting that the issue might be related to the laptop's power management or the display's backlight system.

Mindmap

Keywords

💡Lenovo Laptop

A Lenovo laptop is a portable computer made by the Chinese multinational technology company Lenovo. In the video's context, it is the device that the narrator is working on, specifically dealing with a display issue. The laptop is mentioned as having a 'slim three' model, which could refer to a specific thin and light series of Lenovo laptops.

💡Display Issue

A display issue refers to any problem related to the visual output of a device's screen. In this video, the narrator is addressing a problem where the display input is not showing correctly on the screen, which is central to the troubleshooting process being described.

💡Linoleum

Linoleum is a type of flooring material made from natural materials like linseed oil and cork powder. In the video, the term might be used metaphorically or as a mispronunciation for 'liquid', possibly referring to a liquid crystal display (LCD), which is a common type of display technology used in laptops.

💡Backlight

Backlighting is the process of illuminating something from behind, and in the context of laptop displays, it refers to the light source that makes the screen visible. The script mentions a dimming backlight, which could be a symptom of the display issue being discussed.

💡Invalid Factory

The term 'invalid factory' is not a standard technical term but might be used in the script to describe a condition where the laptop's settings or components are not in their original factory state, possibly due to a repair or modification that has gone wrong.

💡Disconnect

To disconnect means to cut off the connection between two things. In the script, the narrator mentions disconnecting the battery to safely work on the laptop, which is a common safety procedure when troubleshooting electronic devices.

💡Wire

A wire is a conductive material used to transmit electricity or signals. In the context of the video, wires are part of the laptop's internal components, and the script mentions checking the connections and condition of these wires as part of the repair process.

💡Voltage

Voltage is the electric potential difference between two points. The script discusses checking for the correct voltage supply to the screen, which is crucial for its proper functioning. An incorrect voltage can lead to various issues, including the display problem described.

💡Capacitor

A capacitor is an electronic component that stores electrical energy in an electric field. In the video, the narrator checks a '3.3 volt' capacitor, which is likely part of the power supply circuit for the laptop's screen, and its condition could affect the display functionality.

💡Signal

In electronics, a signal is the transmission of information, which in the context of a laptop display, refers to the input that the screen receives to show images. The script mentions checking for signals to ensure that the display is receiving the correct information to function properly.

💡Fuse

A fuse is a safety device that protects electrical circuits from overcurrent by breaking the circuit when the current exceeds a certain level. The script mentions checking a fuse, indicating that a blown fuse could be a cause of the laptop's display issue.

Highlights

The laptop's display is not showing the channel properly, but the screen is dimmed.

The entire project is coming up, but the backside is not visible.

The screen is dimmed, and the speaker is considering applying linolic acid.

The laptop is opened to check the screen's back connection.

The battery is disconnected to prevent any power supply issues during the repair.

A faulty factory soldering is observed.

The display's back wiring is checked for any disconnections.

The WiFi card is verified to ensure it's functioning correctly.

The speaker checks for any loose connections or bad soldering points.

A 3.3-volt supply is confirmed to be present, which is essential for the screen.

A capacitor is identified as potentially causing the issue.

The speaker mentions that the screen's brightness调节 is not working properly.

The repair process includes checking the screen's voltage and current readings.

A jumper is used to bypass a potential issue in the circuit.

The speaker discusses the possibility of a fuse being blown.

The laptop's display issue is suspected to be due to a blown fuse or tension problem.

The repair concludes with the laptop's display functioning correctly after addressing the identified issues.