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Search: Posts Made By: caspian
Forum: Troubleshooting Laptops, Portable, and Mobile Devices 01-29-2020, 02:45 PM
Replies: 1
Views: 75
Posted By caspian
Re: Asus A505BP only turn on sometimes

you should disassemble the laptop and inspect the mainboard to check if any IC has got corroded.
Forum: Schematic Requests ONLY! 01-25-2020, 03:20 PM
Replies: 3
Views: 721
Posted By caspian
Re: lenovo v580c need schematic and help!

I found out that Lenovo v580c, B580, B590, and B490 have similar mainboards. I guess their schematics can be used interchangeably.
I have attached the one that I found. You have to check it yourself...
Forum: Troubleshooting Laptops, Portable, and Mobile Devices 01-22-2020, 02:05 PM
Replies: 2
Views: 139
Posted By caspian
Re: Asus UX510UWK Rev 2.0 keys not working

A number of cases may be possible: It may need reprogramming EC, replacing KBC, or inspecting the connector.
Put replacing KBC last. Sometimes the keyboard connector seem fine, but it cannot make...
Forum: Troubleshooting Laptops, Portable, and Mobile Devices 01-16-2020, 09:05 AM
Replies: 7
Views: 159
Posted By caspian
Re: La-9981P DELL i7 5537 not running on

Now focus on measuring the RAM slot's pins.
Forum: Troubleshooting Laptops, Portable, and Mobile Devices 01-15-2020, 08:27 AM
Replies: 7
Views: 159
Posted By caspian
Re: La-9981P DELL i7 5537 not running on

how much resistance is at SIO_SLP_S3 and SIO_SLP_S4?
measure all the signals on Page 10 of the schematics file to see which ones are present.
Forum: Troubleshooting Laptops, Portable, and Mobile Devices 01-15-2020, 07:44 AM
Replies: 4
Views: 75
Posted By caspian
Re: Asus x501A strange problem

disassemble the laptop to check if any IC has got corroded.
Forum: Troubleshooting Laptops, Portable, and Mobile Devices 01-14-2020, 05:57 AM
Replies: 3
Views: 108
Posted By caspian
Re: Microsoft laptop 2( 1769) windows installation problem

so try to repair or reinitialize the drive.
Forum: Troubleshooting Laptops, Portable, and Mobile Devices 01-14-2020, 05:53 AM
Replies: 9
Views: 302
Posted By caspian
Re: Quadro K2100m smd caps

probably, many such defective chips can be found in the market with a very cheap price.
Forum: Troubleshooting Laptops, Portable, and Mobile Devices 01-13-2020, 03:31 PM
Replies: 3
Views: 108
Posted By caspian
Re: Microsoft laptop 2( 1769) windows installation problem

the boot record of the HDD might be wiped and needs to be repaired. replace the HDD with another one and try again.
In addition, search the net for the following text to find a number of solutions:...
Forum: Troubleshooting Laptops, Portable, and Mobile Devices 01-13-2020, 03:19 PM
Replies: 9
Views: 302
Posted By caspian
Re: Quadro K2100m smd caps

those caps can only be taken from a defective chip of the same model.
Forum: Troubleshooting Laptops, Portable, and Mobile Devices 01-13-2020, 06:28 AM
Replies: 10
Views: 234
Posted By caspian
Re: Bios issue result in No Display ???

yes, but there might be many other causes too.
Forum: Troubleshooting Laptops, Portable, and Mobile Devices 01-12-2020, 03:35 PM
Replies: 10
Views: 234
Posted By caspian
Re: Bios issue result in No Display ???

yes, that is possible.
by saying "No Display", they mean nothing is displayed on the laptop screen.
they do not mean the laptop has a problem only in displaying.
Many laptop problems lead to a "No...
Forum: Troubleshooting Laptops, Portable, and Mobile Devices 01-10-2020, 05:46 AM
Replies: 11
Views: 213
Posted By caspian
Re: la-9104p MB 7 Beeps error and no display

Had the liquid infected the PCH or its nearby components?
Forum: Troubleshooting Laptops, Portable, and Mobile Devices 01-10-2020, 03:25 AM
Replies: 9
Views: 860
Posted By caspian
Re: DELL 3521 - Problem with start. KB9012 question.

what is the theory behind pressing power-button for a while?
what component does get defective inside or outside CPU/PCH that causes electricity to trap in some section of mainboard?
Forum: Troubleshooting Laptops, Portable, and Mobile Devices 01-10-2020, 03:18 AM
Replies: 11
Views: 213
Posted By caspian
Re: la-9104p MB 7 Beeps error and no display

When it gives five beeps, which voltage/signal is not present?
Forum: Troubleshooting Laptops, Portable, and Mobile Devices 01-06-2020, 03:38 PM
Replies: 15
Views: 378
Posted By caspian
Re: Asus R556L - The laptop does not start on battery

To desolder that IC, you need a hot air station. you can watch YouTube videos to learn desoldering.
However, input voltage at Pin 4 on the left IC is 0 v. that is why it does not pass its input....
Forum: Troubleshooting Laptops, Portable, and Mobile Devices 01-06-2020, 05:13 AM
Replies: 15
Views: 378
Posted By caspian
Re: Asus R556L - The laptop does not start on battery

focus on the sections of the mainboard which are related to the battery. measure voltages on those sections when the laptop cannot turn on.
Forum: Troubleshooting Laptops, Portable, and Mobile Devices 01-05-2020, 03:00 AM
Replies: 15
Views: 378
Posted By caspian
Re: Asus R556L - The laptop does not start on battery

3.3V for the power button is good.
X555LD has a repair guide and boardview. you can use them instead of schematics:

https://www.badcaps.net/forum/attachment.php?attachmentid=199163&d=1566828845...
Forum: Troubleshooting Laptops, Portable, and Mobile Devices 12-31-2019, 12:50 PM
Replies: 21
Views: 271
Posted By caspian
Re: Dell 1545 screen backlight on but blank display help me

CCFL screens are difficult to repair. If you connect another CCFL screen with a different model of Inverter, then the mainboard gets damaged. This scenario happened to me once. that is why I do not...
Forum: Troubleshooting Laptops, Portable, and Mobile Devices 12-31-2019, 05:56 AM
Replies: 21
Views: 271
Posted By caspian
Re: Dell 1545 screen backlight on but blank display help me

now, the schematics file is required to check out.
Forum: Troubleshooting Laptops, Portable, and Mobile Devices 12-31-2019, 02:35 AM
Replies: 21
Views: 271
Posted By caspian
Re: Dell 1545 screen backlight on but blank display help me

how is display on an external monitor?
Forum: Troubleshooting Laptops, Portable, and Mobile Devices 12-30-2019, 03:53 PM
Replies: 3
Views: 141
Posted By caspian
Re: Microsoft surface pro 3 black screen

both may be defective. but the more probable suspect is the screen cable.
Forum: Troubleshooting Laptops, Portable, and Mobile Devices 12-30-2019, 03:49 PM
Replies: 15
Views: 378
Posted By caspian
Re: Asus R556L - The laptop does not start on battery

you should measure voltages on the mainboard when the laptop does not turn on. testing another battery can help you a lot.
Forum: Troubleshooting Laptops, Portable, and Mobile Devices 12-30-2019, 03:44 PM
Replies: 9
Views: 231
Posted By caspian
Re: Asus X541UV No CPUPWRGD !!

yes, I guess that is possible.
Forum: Troubleshooting Laptops, Portable, and Mobile Devices 12-30-2019, 01:39 PM
Replies: 9
Views: 231
Posted By caspian
Re: Asus X541UV No CPUPWRGD !!

If CPU_Vcore is high, then there is a high probability that PCH/CPU is defective.
Does the CPU get warm?
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