Laptop Motherboard Repair Test & Troubleshoot 3.3VALW 5VALW Circuits with a Multimeter 

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Thank you for your feedback! I’m glad you found the video informative. For board-level repairs, understanding schematics is a crucial step, and it's great that you're interested in diving into that. Keep up the interest, and feel free to ask if you have more questions

As a beginner, you're on the right track by looking for the schematics! For the ASUS H110M-D, if most terminals in the ATX jack are shorted, I recommend starting by checking the 12V, 5V, and 3.3V rails for any obvious shorts. Disconnect all peripherals and components, like the RAM and CPU, to isolate the motherboard. Then, using a multimeter in continuity mode, check each power rail for shorts to ground. Often, a faulty capacitor or MOSFET might be the cause. If you don’t have the schematics, you can search for common circuit layouts online or use a similar model’s schematics as a reference. Good luck, and feel free to ask if you need more help

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Frankly, I'm the one who should be thanking you.

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Thank you so much, Aminul, for your kind words. I'm truly honored to be part of your learning journey. It's wonderful to hear that you can now read schematic diagrams and understand motherboard repair. Keep up the great work, and if you ever need more guidance or have any questions, don't hesitate to reach out. I'm here to support you, you're doing amazing.

Substitute with Equivalent Diode: You can replace the RB491D with another Schottky diode that has similar specifications. Check the voltage rating and current capacity to find a suitable replacement. The RB491D typically has a forward voltage of around 0.2V and a current rating of 1A, so look for a Schottky diode with similar values (e.g., 1N5819 or SS14 as alternatives). Bypass (Not Recommended): Bypassing the diode is not recommended as it serves a specific purpose in regulating current or protecting the circuit. Without the diode, you risk damaging other components

Thank you for your request! A detailed breakdown of a pad calculator's circuit is a great idea for a video. I'll definitely consider creating one that explains each component, such as the power supply, microcontroller, display, and keypad, in a step-by-step manner. Stay tuned, and I’ll do my best to provide the content you're looking for! Thanks for your support!

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Glad it was helpful!, thank you @francismannion7075

Cool, thanks!

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If you're not getting 19V in the 3.3V and 5V Always circuits, first check for any shorts on the input side of the power rail. Then, verify that the DC-in MOSFETs are working correctly and passing the voltage through. If there's no issue there, check the fuse, capacitors, and other components in the power path. You can also inspect the charging IC, as it controls the power distribution. Make sure the power adapter is functioning properly as well. If all these components check out, it may be necessary to trace the signal and test individual components further. Hope this helps!

@@electronicsrepairbasics_erb awesome thanks 🙏

Thank you

If the +3V or +5V is missing, here’s a systematic approach to diagnose and fix the issue: Check Power Supply: Ensure the power supply is functioning correctly. Use a multimeter to measure the output of the power supply and verify that it is providing the correct voltage B+. Inspect Voltage Regulators: check if they are operating properly. A faulty regulator could cause the absence of voltage. Replace any damaged voltage regulator ICs. Examine Capacitors and Diodes: Look for blown or damaged capacitors, particularly near the power supply section. Faulty capacitors can lead to power loss. Check diodes in the rectifier circuit (if applicable) to ensure they aren't shorted or open. Trace the Circuit Path: Use a schematic diagram to trace the power supply circuit from the source to the affected area. Check continuity with a multimeter to find where the voltage drop occurs. Check for Short Circuits: Look for any short circuits or burnt components that could be pulling down the voltage. This may include checking MOSFETs or transistors that are connected to the power line. Inspect Connectors and Solder Joints: Ensure that connectors and solder joints are intact and not loose or cold-soldered. Reflow or resolder joints if necessary. Replace Faulty Components: If individual components like resistors, diodes, or ICs are identified as faulty, replace them with appropriate equivalents. By following this methodical troubleshooting approach, you should be able to locate and fix the issue causing the missing +3V or +5V.

@@electronicsrepairbasics_erb Thank you very much

My pleasure

Hi there, Here are some steps you can try: Check the Power Supply: Ensure the laptop is properly connected to a working power source. Perform a Hard Reset: Disconnect the power adapter, remove the battery (if possible), and hold down the power button for about 15-30 seconds. Then, reconnect the power adapter and try turning the laptop on again. Inspect RAM: Sometimes, loose or faulty RAM can cause display issues. Try reseating the RAM modules or testing with different RAM sticks if available. Check for External Display: Connect the laptop to an external monitor or TV to see if the issue is with the laptop's screen. Examine the Laptop’s Components: Look for loose cables or components inside the laptop. If you’re comfortable doing so, you can open the laptop to check. Feel free to update me on your progress or if you have any further questions! Good luck

Thanks 🙏, the person that gave me the laptop disassemble the laptop,I was the one that assembled it,I plug in charger I read the mosfet it gave me 19v, I read the battery terminal it gave me 3.3.if I press the power button it bring light on the power,I on it and off it.when ever press the power button it will make a sound like it will start the fan will spin and stop.if I plugged charger it shows charging light.I clean the ram and install it still ,I ask the person he told me he removed the ram a and kept it for long time

I am a phone technician,I don't know anything about fixing of laptop.Thank you for your support sir

I will study your video,It will really help me

Into DC of course

@@electronicsrepairbasics_erb thanks sir

Thank you too

It's great to hear from a fellow hardware enthusiast. I'm glad you enjoyed the presentation. If you have any questions or need more insights, feel free to reach out. Happy learning and keep up the passion for hardware