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Search: Posts Made By: caspian
Forum: General Electronics Technical Discussion 06-26-2022, 12:09 PM
Replies: 11
Views: 192
Posted By caspian
Re: Conversion of Anolog Voltmeter into Ammeter

After opening the frame of the meter and closing it, I tested the meter again using my test setup circuit depicted in Post#1. Then, I found out that the meter works fine with the 0.2 shunt resistor...
Forum: Troubleshooting Desktop Motherboards, Graphics Cards, and PC Peripherals 06-25-2022, 01:44 PM
Replies: 1
Views: 103
Posted By caspian
Re: Alternative to 4c05n Mosfet 30v 78a

Study the following page that is about laptops but can be used in GPU Mosfets too:
...
Forum: General Electronics Technical Discussion 06-25-2022, 01:19 PM
Replies: 11
Views: 192
Posted By caspian
Re: Conversion of Anolog Voltmeter into Ammeter

I do not want to remove the 3kohm resistor inside the meter. because then it becomes too sensitive and can measures only low currents.
Is there any solution to use this nice analog voltmeter as an...
Forum: General Electronics Technical Discussion 06-25-2022, 01:09 PM
Replies: 11
Views: 192
Posted By caspian
Re: Conversion of Anolog Voltmeter into Ammeter

I disassembled the analog voltmeter and depicted its schematic in the picture. You were right. There is a resistor inside the meter.
I used a 2 Ohm resistor as the shunt in my test setup circuit....
Forum: General Electronics Technical Discussion 06-25-2022, 11:42 AM
Replies: 11
Views: 192
Posted By caspian
Re: Conversion of Anolog Voltmeter into Ammeter

Thanks for all the answers, @sam_sam_sam, @R_J, and @redwire.
All the connections of the components are tested in the circuit and none of them is poor.
I do not know if any resistor is inside the...
Forum: General Electronics Technical Discussion 06-25-2022, 08:13 AM
Replies: 11
Views: 192
Posted By caspian
Re: Conversion of Anolog Voltmeter into Ammeter

The internal resistance of the voltmeter is about 3.5KOhms.
I did not modified the internal components of the voltmeter.
Is my simple test setup correct?
Do I have to use a more complicated test...
Forum: General Electronics Technical Discussion 06-25-2022, 07:13 AM
Replies: 11
Views: 192
Posted By caspian
Conversion of Anolog Voltmeter into Ammeter

Dear Members,

I have an old analog voltmeter that can correctly measure DC voltage between 0v to 3v. The voltmeter is made by Toyokeiki depicted in the photos. It does not need any battery. It...
Forum: Troubleshooting Laptops, Tablets, and Mobile Devices 06-24-2022, 12:52 PM
Replies: 3
Views: 109
Posted By caspian
Re: IT8585e and IT8586e compatible?

In general, no two SIO chips with different models are compatible. Order exactly the same chip.
Forum: Troubleshooting Laptops, Tablets, and Mobile Devices 06-21-2022, 05:28 AM
Replies: 7
Views: 203
Posted By caspian
Re: How can we prevent 19v entering SOC?

I did some research and studied that isolation is often implemented in AC circuits.
In DC circuits, I have not found any practical isolation technique yet that can be used in the restricted space of...
Forum: Troubleshooting Laptops, Tablets, and Mobile Devices 06-20-2022, 12:16 PM
Replies: 7
Views: 203
Posted By caspian
How can we prevent 19v entering SOC?

Dear Forum Members,

When the high side Mosfet gets shorted, the 19v power easily enters the CPU or PCH without any protection.
I think the buck-converter circuits in laptops should be modified...
Forum: Troubleshooting Laptops, Tablets, and Mobile Devices 06-20-2022, 09:10 AM
Replies: 5
Views: 1,074
Posted By caspian
Re: Adiedkhaz Book of Laptop ?

That book was one of the first good books on the topic of laptop repair.
Most books have some price. If you do not want to buy that book, you should study the many free pages and videos that are...
Forum: Troubleshooting Power Supplies and Power Supply Design 06-16-2022, 07:00 AM
Replies: 4
Views: 227
Posted By caspian
Re: Can Ammeter damage Power Supply?

I am going to provide a separate power to the Ammeter/Voltmeter module from an AC power adapter. (see the picture)
The power adapter is completely separate from the linear power supply, except for...
Forum: Troubleshooting Laptops, Tablets, and Mobile Devices 06-13-2022, 12:12 PM
Replies: 24
Views: 858
Posted By caspian
Re: HP Probook 450 G6

The 6.9v on the photo seems wrong. you might mean 0.9v.
Have you really measured 6.9v on those two coils?
Forum: Troubleshooting Laptops, Tablets, and Mobile Devices 06-08-2022, 06:57 AM
Replies: 6
Views: 193
Posted By caspian
Re: Dell Inspiron 5100 (2003) with RAM issues (voltage, PSU suspect ??)

Yes, voltage regulators are potential suspects for overheating.
However, the issue can be due to any other component. To discover it, you should notice the hardware symptoms and check the...
Forum: Troubleshooting Laptops, Tablets, and Mobile Devices 06-07-2022, 03:00 AM
Replies: 6
Views: 193
Posted By caspian
Re: Dell Inspiron 5100 (2003) with RAM issues (voltage, PSU suspect ??)

DDR1 RAM sticks work with 2.5v whereas SDRAM RAM sticks work with 3.3v. That depends on the type of the RAMs.
If the Laptop works with DDR1 RAM, you should not install SDRAM on the laptop.
A...
Forum: Troubleshooting Laptops, Tablets, and Mobile Devices 06-06-2022, 09:48 PM
Replies: 6
Views: 193
Posted By caspian
Re: Dell Inspiron 5100 (2003) with RAM issues (voltage, PSU suspect ??)

The symptoms that you observe in software and Bios are sometimes misleading. you are supposed to check the mainboard considering voltages and temperatures.
Is there any IC on the mainboard that gets...
Forum: Troubleshooting Power Supplies and Power Supply Design 06-05-2022, 01:42 AM
Replies: 4
Views: 227
Posted By caspian
Can Ammeter damage Power Supply?

Dear Members,

My DC linear Lab Power Supply does not display the current and voltage correctly. Thus, I am going to connect an Ammeter/Voltmeter Module to the DC output of the power supply. Then,...
Forum: Troubleshooting Laptops, Tablets, and Mobile Devices 05-27-2022, 01:29 AM
Replies: 147
Views: 55,978
Posted By caspian
Re: Dell n5010 can be converted from graphic version to non graphic

It is probably possible. but you need to modify the mainboard more. It is not done by anyone yet. So you have to discover it yourself. I think it is not worth it to try, because it is possible to...
Forum: Troubleshooting Laptops, Tablets, and Mobile Devices 05-27-2022, 12:43 AM
Replies: 147
Views: 55,978
Posted By caspian
Re: Dell n5010 can be converted from graphic version to non graphic

The described conversion method is only for the internal screen. The external displays do not work. and it is normal.
Forum: Troubleshooting Laptops, Tablets, and Mobile Devices 05-26-2022, 06:56 AM
Replies: 6
Views: 193
Posted By caspian
Re: asus gl502vsk no +vccore

Repair the circuit with your own risk. Because it is possible that the repaired circuit fails and then burns the CPU.
Forum: Troubleshooting Laptops, Tablets, and Mobile Devices 05-26-2022, 04:16 AM
Replies: 6
Views: 193
Posted By caspian
Re: asus gl502vsk no +vccore

I had a typing mistake. I edited Post#4.
Forum: Troubleshooting Laptops, Tablets, and Mobile Devices 05-26-2022, 03:58 AM
Replies: 6
Views: 193
Posted By caspian
Re: asus gl502vsk no +vccore

PU8100, PU8101, and PU8102 are not working. So PU8100, PU8101, and PU8102, and their connected Mosfets are the suspects. With a low probability, NCP81205 can be a suspect too.
Personally, I never...
Forum: Troubleshooting Laptops, Tablets, and Mobile Devices 05-25-2022, 01:43 PM
Replies: 6
Views: 193
Posted By caspian
Re: asus gl502vsk no +vccore

If you have measured PU8109, PU8101, and PU8102, you need to report the results to reach a conclusion on this issue.
Forum: Troubleshooting Laptops, Tablets, and Mobile Devices 05-12-2022, 04:27 AM
Replies: 14
Views: 559
Posted By caspian
Question Why does PCH get shorted internally?

Dear members.

I have faced many times various laptops that have PCH with an internal short to GND on the 3.3v rail. I have seen this kind of short both in old and recent laptops.
Once I faced...
Forum: Troubleshooting Desktop Motherboards, Graphics Cards, and PC Peripherals 03-30-2022, 01:48 PM
Replies: 6
Views: 252
Posted By caspian
Re: GA-945GCM-S2L - low voltage on VTT_GMCH

When CPU is out of the board, I connected VTT_GMCH to GND using a 15 Ohm resistor and a 6 Ohm resistor. then, I observed VTT_GMCH was still stable at 1.22v with each one of these resistors.
Showing results 1 to 25 of 500

 
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