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Search: Posts Made By: piernov
Forum: Troubleshooting Laptops, Portable, and Mobile Devices Today, 05:33 PM
Replies: 0
Views: 9
Posted By piernov
215-0674042 to 215-0674058, POST but no iGPU

Hi,
I replaced the AMD northbridge part number 215-0674042 by a 215-0674058 on an H-AIRA-RS780L-uATX board.
Now it POSTs but does 2 short 1 long beeps 5 times, meaning the iGPU doesn't initialize....
Forum: Troubleshooting Laptops, Portable, and Mobile Devices Yesterday, 11:21 PM
Replies: 6
Views: 96
Posted By piernov
Re: Help me understand this schematic

Maybe PC191 is shorted or PU9 is bad then.
Forum: Troubleshooting Laptops, Portable, and Mobile Devices Yesterday, 11:16 PM
Replies: 7
Views: 156
Posted By piernov
Re: HP DC7700 No POST, No Display

Yes swapping BIOS IC is ok.
Did you check the capacitors?
What's the voltage on CPU Vcore? (can be measured between the coils next to the CPU and ground, or across the capacitors next to the CPU)
Forum: Troubleshooting Laptops, Portable, and Mobile Devices Yesterday, 11:34 AM
Replies: 6
Views: 96
Posted By piernov
Re: Help me understand this schematic

As per datasheet, VCC (pin 3) is connected to PVCC (pin 19, VDD on schematics) through a 10 ohm resistor internal to the PM6686 chip.
Forum: Troubleshooting Laptops, Portable, and Mobile Devices Yesterday, 06:40 AM
Replies: 7
Views: 156
Posted By piernov
Re: HP DC7700 No POST, No Display

Flash the BIOS first before anything.
Also a lot of those boards have garbage CapXon 470F 6.3V capacitors. (I think the earlier revisions with Pentium D, not the Pentium Dual-Core/Core 2 Duo ones)...
Forum: Troubleshooting Laptops, Portable, and Mobile Devices Yesterday, 06:29 AM
Replies: 1
Views: 24
Posted By piernov
Re: Samsung NP270E5E starts but won't boot

It's in UEFI only mode. Use a UEFI installation media or enable CSM/Legacy Boot in setup.
Forum: Troubleshooting Laptops, Portable, and Mobile Devices Yesterday, 06:09 AM
Replies: 2
Views: 25
Posted By piernov
Re: HP G62 boardview - which app to open

Schematics says "Foxconn Safina", while the boardview filename says "Quanta AX2/AX7", so this is not the correct file.

Btw the boardview is "QL4-MB-E.brd" inside the archive, can be opened with...
Forum: Troubleshooting Laptops, Portable, and Mobile Devices 02-19-2019, 04:34 AM
Replies: 12
Views: 113
Posted By piernov
Re: Lenovo g500 - LA-9631P boardview needed

+3VLP is enabled by the ENLDO_3V5V indeed coming from PR402. +5VLP is always enabled.
However +3VALW and +5VALW are enabled by 3V5V_EN which comes from the EC.
Note that the pinouts for PU401 and...
Forum: Troubleshooting Laptops, Portable, and Mobile Devices 02-17-2019, 03:52 PM
Replies: 2
Views: 65
Posted By piernov
Re: Apple macbook 820-3115 stops working without ram

Better put back a proper fuse for a good repair.
Apple logo after 20 seconds is a bit slow, try PRAM reset and maybe try another drive…
Thunderbolt power rail will only show up when a thunderbolt...
Forum: Troubleshooting Laptops, Portable, and Mobile Devices 02-17-2019, 05:57 AM
Replies: 54
Views: 1,961
Posted By piernov
Re: DAX1BDMB6F0 Power Issue

It sounds like an issue related to the EC. As a shot in the dark I'd try to flash it or replace it with a new one.
Forum: Troubleshooting Laptops, Portable, and Mobile Devices 02-16-2019, 12:35 PM
Replies: 4
Views: 104
Posted By piernov
Forum: Troubleshooting Laptops, Portable, and Mobile Devices 02-15-2019, 09:16 AM
Replies: 28
Views: 2,078
Posted By piernov
Re: Lenovo G50-70 ACLU1/ACLu2 NM-A271 Rev. 1.0 no power

Ok so charger IC circuit is perfectly good now.
SDA and SCL are 0V most likely because +3VALW is missing. +3VALW may be missing due to missing EC_ON.
First make sure you have +3VLP.
If +3VLP is...
Forum: Troubleshooting Laptops, Portable, and Mobile Devices 02-15-2019, 07:29 AM
Replies: 6
Views: 120
Posted By piernov
Re: HDD not start after board start - Why?

Is it POSTing properly? If BIOS doesn't run, HDD may not start.
Forum: Troubleshooting Laptops, Portable, and Mobile Devices 02-15-2019, 07:27 AM
Replies: 8
Views: 138
Posted By piernov
Re: Macbook Air A1466 820-00165 Won't Boot with battery installed.

It looks like a dead battery to me, but first confirm the voltage on PPVBAT_G3H_CONN with battery only, charger disconnected.
Forum: Troubleshooting Laptops, Portable, and Mobile Devices 02-14-2019, 02:21 PM
Replies: 29
Views: 522
Posted By piernov
Re: Apple macbook a1278 820-2936 need some help

So something changed from before? Are ALL_SYS_PWRGD, PM_PCH_SYS_PWROK and CPU VCore spiking as well?
Forum: Troubleshooting Laptops, Portable, and Mobile Devices 02-14-2019, 02:17 PM
Replies: 4
Views: 81
Posted By piernov
Re: HP 625 - power down when fan kick in

RS880M northbridge probably dead as they always are. You can try to heat its die to 200C for a couple of minutes to see if it comes on. Will need to be replaced.
Forum: Troubleshooting Laptops, Portable, and Mobile Devices 02-14-2019, 02:13 PM
Replies: 38
Views: 735
Posted By piernov
Re: Compal LA-8127P no power (help please)

Ok so BIOS runs but there's a POST issue. Try plugging another known good and compatible stick of RAM.
If after trying multiple sticks of RAM it still doesn't make any difference you can check RAM...
Forum: Troubleshooting Laptops, Portable, and Mobile Devices 02-14-2019, 01:52 PM
Replies: 8
Views: 138
Posted By piernov
Re: Macbook Air A1466 820-00165 Won't Boot with battery installed.

Did you try another battery?
What happens with battery only, no charger?
What's the voltage on PPBUS_G3H, PP3V42_G3H with battery and without battery?
Forum: Troubleshooting Laptops, Portable, and Mobile Devices 02-14-2019, 11:28 AM
Replies: 1
Views: 86
Posted By piernov
LA-6911P discrete to UMA

Hi,

Acer 7750G, board Compal LA-6911P with (obviously) a dead 216-081005.
Does anyone know the procedure to convert from discrete to UMA? Couldn't find any info on the web, schematics is...
Forum: Troubleshooting Laptops, Portable, and Mobile Devices 02-14-2019, 11:20 AM
Replies: 8
Views: 138
Posted By piernov
Re: Macbook Air A1466 820-00165 Won't Boot with battery installed.

Try PRAM reset. If there's an EFI password set you'll have to remove it first.
Forum: Troubleshooting Laptops, Portable, and Mobile Devices 02-14-2019, 11:19 AM
Replies: 16
Views: 227
Posted By piernov
Re: Asus X450CC

Measuring voltage and resistance to ground on every coil is very easy and quick to do, and will give a rough idea of what state the board is in, and help pinpointing where to concentrate on the power...
Forum: Troubleshooting Laptops, Portable, and Mobile Devices 02-14-2019, 11:12 AM
Replies: 38
Views: 735
Posted By piernov
Re: Compal LA-8127P no power (help please)

So the board turns? We'll go from there.
What's the beep pattern?
What's the exact voltage on CPU VCore?
Forum: Troubleshooting Laptops, Portable, and Mobile Devices 02-14-2019, 10:47 AM
Replies: 19
Views: 264
Posted By piernov
Re: Dv6700 dead, only adopter light in on

I think it's this section that's acting as a charge pump.
Not exactly sure how it works but I think the opamp circuitry around PU8 is an astable multivibrator and PQ27 is some sort of "buffer" to...
Forum: Troubleshooting Laptops, Portable, and Mobile Devices 02-13-2019, 05:58 AM
Replies: 38
Views: 735
Posted By piernov
Re: Compal LA-8127P no power (help please)

I think REGN should be generated as soon as the chip receives power. If you inject 6V on REGN output does it draw any current?
Are you confident in your soldering? Also maybe the "new" chips are...
Forum: Troubleshooting Laptops, Portable, and Mobile Devices 02-11-2019, 04:07 AM
Replies: 17
Views: 348
Posted By piernov
Re: TIP: How to charge laptop battery with PSU

Battery has internal protections managed by the BMS. If something goes wrong (cells get unbalanced too much for example), then it can enter permanent failure mode and blow the fuse. You'd need to...
Showing results 1 to 25 of 500

 
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