Badcaps.net Forum
Go Back   Badcaps Forums > Search Forums
Register FAQ Calendar Search Today's Posts Mark Forums Read

Showing results 1 to 25 of 500
Search took 0.03 seconds.
Search: Posts Made By: khaahk
Forum: Troubleshooting Laptops, Portable, and Mobile Devices 06-10-2019, 11:04 PM
Replies: 20
Views: 480
Posted By khaahk
Re: asus x451UA no ACOK

Learning through experience is sometimes time consuming.
Good microscope should be of help in these cases.
Good work!
Forum: Troubleshooting Laptops, Portable, and Mobile Devices 06-04-2019, 02:53 PM
Replies: 3
Views: 68
Posted By khaahk
Re: Ic 1285a replacement

http://www.ti.com/lit/ds/symlink/tps51285b.pdf

Replacement might be 51225b/c
https://www.ti.com/lit/ds/symlink/tps51225.pdf
but not sure, if possible use original.
Forum: Troubleshooting Laptops, Portable, and Mobile Devices 05-24-2019, 08:50 AM
Replies: 27
Views: 615
Posted By khaahk
Re: Samsung np300e5a turn on but no image

4 ohm on video card and 13 ohms on cpu vcore are fine. The one that stands up is 0.64 ohms on PCH power line. Try to measure resistance without the coil to see on what side the low ohms reading is.
Forum: Troubleshooting Laptops, Portable, and Mobile Devices 05-23-2019, 01:42 PM
Replies: 27
Views: 615
Posted By khaahk
Re: Samsung np300e5a turn on but no image

Please define make short, in ohms.
1.05V is probably pch power supply line.
If machine boots then everything is fine, usb and so on?
Forum: BIOS Requests ONLY! 05-19-2019, 12:36 PM
Replies: 28
Views: 309
Posted By khaahk
Re: issue with dell latitude 5480 bios rewrite

Desolder and read-erase-write?
Forum: Troubleshooting Laptops, Portable, and Mobile Devices 05-16-2019, 12:45 PM
Replies: 12
Views: 476
Posted By khaahk
Re: Alienware 18 LA-9332P 3V, 5V short

Use lab PSU to find shorts in +3VALW and +3VS, the same with +5VALW and +5VS rails. It is most likely not an easy job - probably need to replace many components (maybe too many). If successful then...
Forum: Troubleshooting Laptops, Portable, and Mobile Devices 05-07-2019, 12:05 PM
Replies: 20
Views: 480
Posted By khaahk
Re: asus x451UA no ACOK

Things that seem out of order:
ACDET 3.2V - too high, it is a simple voltage divider - something not correct there - it's value does not depend on charger - check the resistors.

SDA & SCL should...
Forum: Troubleshooting Laptops, Portable, and Mobile Devices 05-06-2019, 12:36 PM
Replies: 20
Views: 480
Posted By khaahk
Re: asus x451UA no ACOK

Strange i don't remember seeing that on any boards.
Forum: Troubleshooting Laptops, Portable, and Mobile Devices 05-06-2019, 12:41 AM
Replies: 8
Views: 245
Posted By khaahk
Re: HP Probook 650 G2 won't turn on after bios chip replacement

2 options come to mind:
1. Buy spi programmer, save the content of the bought chip and try to find correct one online (this forum has many threads with that model).
2. Buy another chip from ebay...
Forum: Troubleshooting Laptops, Portable, and Mobile Devices 05-03-2019, 01:46 PM
Replies: 8
Views: 245
Posted By khaahk
Re: HP Probook 650 G2 won't turn on after bios chip replacement

Not sure how good are these preprogrammed chips, i mean the content. Put the old one back and if it is ok then try to solve it with seller.
Forum: Troubleshooting Laptops, Portable, and Mobile Devices 05-03-2019, 12:29 PM
Replies: 8
Views: 245
Posted By khaahk
Re: HP Probook 650 G2 won't turn on after bios chip replacement

And what was the content of the other chip?
Did you put it back with same orientation?
Forum: Troubleshooting Laptops, Portable, and Mobile Devices 04-28-2019, 02:05 AM
Replies: 5
Views: 72
Posted By khaahk
Re: when i close the led screen, don't go to sleep.

There should have been a magnet glued to the lcd assembly, on the opposite of the laptop there is a hall sensor somewhere. Hall sensor reacts to magnet and laptop knows that you have closed the lid.
Forum: Troubleshooting Laptops, Portable, and Mobile Devices 04-26-2019, 01:26 AM
Replies: 20
Views: 480
Posted By khaahk
Re: asus x451UA no ACOK

About HIDRV correct, on the PHASE pin there are also impulses which will be equalized after inductor (with the cooperation of capacitors). Your multimeter should show mean value instead of impulses.
Forum: Troubleshooting Laptops, Portable, and Mobile Devices 04-25-2019, 03:37 PM
Replies: 20
Views: 480
Posted By khaahk
Re: asus x451UA no ACOK

So pins 17,19,20 have 900mV on good board? Strange because it looks like they should have battery voltage. Pins 26 and 27 have same voltage - check for solder bridge on charger or high-side mosfet...
Forum: Troubleshooting Laptops, Portable, and Mobile Devices 04-21-2019, 01:54 AM
Replies: 3
Views: 160
Posted By khaahk
Re: Bios dump include the KBC?

EC content begins at 20 0000 in this dump.
Search for string "ene" or "ite" depending on the ec type.
As i see you have already changed the win key to xxxx -s, that's a good practice.
Another way...
Forum: BIOS Requests ONLY! 04-15-2019, 04:00 AM
Replies: 10
Views: 370
Posted By khaahk
Re: Lenovo Thinkpad T450S need bios

This is working bios, can confirm.
Forum: Troubleshooting Laptops, Portable, and Mobile Devices 04-14-2019, 07:56 AM
Replies: 24
Views: 449
Posted By khaahk
Re: Dead no response. No lights at all. Got 3v at pwr button, But 0v at bios pin 1,8

Pressing power button brings NBSWON1# from 3V to low state?
After that IT8987 should bring DNBSWON# high and give a short low pulse to cpu.
Cpu should respond with susb# and susc# going high.
...
Forum: Troubleshooting Laptops, Portable, and Mobile Devices 04-05-2019, 03:20 PM
Replies: 13
Views: 282
Posted By khaahk
Forum: Troubleshooting Laptops, Portable, and Mobile Devices 04-05-2019, 01:46 PM
Replies: 3
Views: 86
Posted By khaahk
Re: LA-B921P Yoga 3 11 - No power

check esd protection diode, pd105.
Forum: Troubleshooting Laptops, Portable, and Mobile Devices 04-05-2019, 01:05 PM
Replies: 13
Views: 282
Posted By khaahk
Re: Lenovo SL400 Dead. Need Help

It should go up to 3V after pressing powerbtn and then low for a moment but you can not see it with multimeter. ICH should respond with susb and susc going high, if i am correct. Does it happen?
Forum: Troubleshooting Laptops, Portable, and Mobile Devices 04-05-2019, 12:16 PM
Replies: 13
Views: 282
Posted By khaahk
Re: Lenovo SL400 Dead. Need Help

what do you mean by:

no PM_PWRBTN out of SIO
Forum: Troubleshooting Laptops, Portable, and Mobile Devices 04-04-2019, 02:32 PM
Replies: 13
Views: 282
Posted By khaahk
Re: Lenovo SL400 Dead. Need Help

PWRSW# comes to sio?
LID_SW# is high?
How much current is drawn from adapter?
Does sio get warm? (if current drawn is higher than 30mA)
Forum: Troubleshooting Laptops, Portable, and Mobile Devices 03-24-2019, 03:27 PM
Replies: 11
Views: 230
Posted By khaahk
Forum: Troubleshooting Laptops, Portable, and Mobile Devices 03-21-2019, 03:16 PM
Replies: 11
Views: 230
Posted By khaahk
Re: ripped IC tripping USB OVERCURRENT

Some kind of ESD protection.
http://www.aosmd.com/res/data_sheets/AOZ8808DI-03.pdf
Forum: Schematic Requests ONLY! 03-20-2019, 03:21 AM
Replies: 8
Views: 5,373
Posted By khaahk
Re: Samsung NP300 Diagram

What does malfunction mean? Not working at all?
LCD screens have been replaced?

PS
It is not a schematic request, you should start a new topic.
Showing results 1 to 25 of 500

 
Forum Jump


Badcaps.net Technical Forums 2003 - 2019
Powered by vBulletin ®
Copyright ©2000 - 2019, Jelsoft Enterprises Ltd.
All times are GMT -6. The time now is 03:40 PM.
Did you find this forum helpful?