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Search: Posts Made By: caspian
Forum: Troubleshooting Laptops, Tablets, and Mobile Devices 05-12-2022, 04:27 AM
Replies: 14
Views: 390
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: 220
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.
Forum: Troubleshooting Desktop Motherboards, Graphics Cards, and PC Peripherals 03-30-2022, 01:37 AM
Replies: 6
Views: 220
Posted By caspian
Re: GA-945GCM-S2L - low voltage on VTT_GMCH

Once, when CPU is out of the board, I connected VTT_GMCH to GND using a 50 Ohm resistor. then, I observed VTT_GMCH was still stable at 1.22v.
That means, if the resistance of VTT_GMCH be 50 Ohms,...
Forum: Troubleshooting Desktop Motherboards, Graphics Cards, and PC Peripherals 03-30-2022, 01:31 AM
Replies: 6
Views: 220
Posted By caspian
Re: GA-945GCM-S2L - low voltage on VTT_GMCH

Since the schematics of this mainboard includes an advertising link inside, I cannot attach it here. But it can be found by Google searching.
Currently, I have no more CPU to test on this mainboard....
Forum: Troubleshooting Desktop Motherboards, Graphics Cards, and PC Peripherals 03-30-2022, 01:04 AM
Replies: 6
Views: 220
Posted By caspian
Re: GA-945GCM-S2L - low voltage on VTT_GMCH

I am sorry. I had a typing mistake. I correct it as below:
When CPU is out of the board, VTT_GMCH is fine at 1.22v. In this case, we have:
Pin1 of Q287: 1v
Pin2 of Q287: 1.5v
Pin3 of Q287: 1v...
Forum: Troubleshooting Laptops, Tablets, and Mobile Devices 03-28-2022, 12:57 PM
Replies: 0
Views: 120
Posted By caspian
Causes of Failure After Buck Converter Repair in Laptop

Dear members,

Recently, I watched this nice video:
www.youtube.com/watch?v=XBAn2Ck8GeE

I have experienced such a failure many times in laptops.
He replaced the Mosfets and the controller of a...
Forum: Troubleshooting Desktop Motherboards, Graphics Cards, and PC Peripherals 03-28-2022, 12:29 PM
Replies: 6
Views: 220
Posted By caspian
GA-945GCM-S2L - low voltage on VTT_GMCH

Dear members,

I have a GA-945GCM-S2L mainboard that I am fixing. All voltage rails are fine in this mainboard, except for VTT_GMCH.

When CPU is out of the board, VTT_GMCH is fine at 1.22v. In...
Forum: Troubleshooting Desktop Motherboards, Graphics Cards, and PC Peripherals 03-03-2022, 04:56 AM
Replies: 0
Views: 150
Posted By caspian
ECS MCP61M-M3 Chipset gets hot when Graphics card is pluged

Dear Forum Members,

I have an ATX mainboard: ECS MCP61M-M3 with CPU: Sempron 140 and Chipset: MCP61.
If I use only the Onboard Graphics, the Chipset's temperature is about 52'C.
If I use a PCIE...
Forum: Troubleshooting Desktop Motherboards, Graphics Cards, and PC Peripherals 02-25-2022, 01:04 AM
Replies: 7
Views: 813
Posted By caspian
Re: rx 470 nitro+ 4gb mosfet problem

what is the temperature of the GPU now?
Forum: Troubleshooting Laptops, Tablets, and Mobile Devices 12-05-2021, 12:03 PM
Replies: 0
Views: 172
Posted By caspian
What if I disable PWRLIMIT# in laptop?

Dear Forum Members,

I have an Asus K43L laptop with water damage in the circuit that generates the PWRLIMIT# signal. PWRLIMIT# goes to EC and CPU/PCH.
What is the operation of this signal?
What...
Forum: Troubleshooting Laptops, Tablets, and Mobile Devices 12-04-2021, 08:29 AM
Replies: 16
Views: 815
Posted By caspian
Re: Hp battery drains even after shutdown

Considering the fact that this model of laptop is old, it is possible that the battery was being stored in a storage for years. this may be a possible reason that the battery lost its strength. What...
Forum: Troubleshooting Laptops, Tablets, and Mobile Devices 12-04-2021, 04:29 AM
Replies: 7
Views: 405
Posted By caspian
Re: Toshiba Qosmio X70 CPU power

How much voltage is on CPU_VCore now?
Forum: Troubleshooting Laptops, Tablets, and Mobile Devices 12-03-2021, 01:11 PM
Replies: 5
Views: 506
Posted By caspian
Re: Lenovo G510 AMD Graphics Card not Detected

Updating Bios is not enough. You are supposed to reporogram the Bios chip entirely using an external programmer. But first, take a backup of the Bios chip.
Forum: Troubleshooting Laptops, Tablets, and Mobile Devices 12-03-2021, 09:53 AM
Replies: 16
Views: 815
Posted By caspian
Re: Hp battery drains even after shutdown

I think the LDO output (+5VALW) must be On after shutdown. According to the schematics, there must be supply on +5VPCU and +3VPCU when the laptop is off.
Is this the case when the AC adapter is...
Forum: Troubleshooting Laptops, Tablets, and Mobile Devices 12-03-2021, 05:00 AM
Replies: 16
Views: 815
Posted By caspian
Re: Hp battery drains even after shutdown

How much voltage is on the Enable pin exactly?
Maybe, it got stuck on a high voltage.
Forum: Troubleshooting Laptops, Tablets, and Mobile Devices 12-02-2021, 10:24 AM
Replies: 1
Views: 189
Posted By caspian
Re: Lenovo 11e problems (any sata hdds are not recognized, sleep battery drain)

measure voltage on the Sata connector again when both the Sata HDD and a USB mouse are connected, to check for voltage drop or instability. You can check the other Sata pins as well.
Forum: Troubleshooting Laptops, Tablets, and Mobile Devices 12-01-2021, 01:19 PM
Replies: 4
Views: 1,209
Posted By caspian
Re: Asus FX505DT

Thanks,
Is there any hot Mosfet now after the replacement?
How much hot is the CPU now?
Forum: Troubleshooting Laptops, Tablets, and Mobile Devices 12-01-2021, 06:59 AM
Replies: 7
Views: 405
Posted By caspian
Re: Toshiba Qosmio X70 CPU power

you should take a look at the datasheet of this CPU to check if it can accept 1.7v.
Forum: Troubleshooting Laptops, Tablets, and Mobile Devices 12-01-2021, 12:42 AM
Replies: 3
Views: 263
Posted By caspian
Re: How much output current is required on the Laptop rails?

Once I saw a laptop with a failed CPU_Core rail. Then, the repairman soldered a wire from the 1.05v rail to provide voltage for the CPU_Core rail. Surprisingly, it worked. He put the CPU under stress...
Forum: Troubleshooting Laptops, Tablets, and Mobile Devices 11-30-2021, 04:08 PM
Replies: 4
Views: 454
Posted By caspian
Re: HP zBook 15 G3 - 5 blinks - System board error

have you tried another RAM stick?
It may indicate a GPU Error. just a possibility among many.
how much do the CPU and the GPU get hot?
Forum: Troubleshooting Laptops, Tablets, and Mobile Devices 11-30-2021, 02:37 PM
Replies: 3
Views: 263
Posted By caspian
Re: How much output current is required on the Laptop rails?

I attached the diagram of one of these buck converters for clarity. It says it can provide 12A typically and 18A maximally.
How much current is used in practice on various laptop power rails,...
Forum: Troubleshooting Laptops, Tablets, and Mobile Devices 11-30-2021, 11:02 AM
Replies: 4
Views: 454
Posted By caspian
Re: HP zBook 15 G3 - 5 blinks - System board error

It can be anything on the mainboard including Bios. you have to test the mainboard to figure it out. are all the power rails present?
Forum: Troubleshooting Laptops, Tablets, and Mobile Devices 11-30-2021, 09:30 AM
Replies: 7
Views: 405
Posted By caspian
Re: Toshiba Qosmio X70 CPU power

Is the CPU replaceable in this model of laptop?
How did you remove the short that was in the CPU?
Did you replace the Mosfets by the same model?
Forum: Troubleshooting Laptops, Tablets, and Mobile Devices 11-30-2021, 06:05 AM
Replies: 3
Views: 263
Posted By caspian
Question How much output current is required on the Laptop rails?

Dear Technicians,

Lets consider the buck converter circuits that we see in Laptop mainboards including 3.3v, 5v, 1.05v, RAM power rail, CPU_Core rail, and GPU_Core rail. The schematics mention...
Forum: Troubleshooting Laptops, Tablets, and Mobile Devices 08-01-2021, 01:35 AM
Replies: 2
Views: 380
Posted By caspian
Re: ASUS K56CB R505CB-SB51-CB LCD Problem

you should negotiate with Screen Country about the problem and report the result here.
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