Forum: Troubleshooting Laptops, Tablets, and Mobile Devices
06-30-2022, 09:02 AM
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Replies: 4
Views: 128
Re: laptop screen pull glue strips
I managed to get some Tesa bond and detach (product number was 70465) from adhesives.com.au about 18 months ago. They custom cut a few rolls to the widths I wanted (6mm and 10mm). Cost me about $50 a...
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Forum: Troubleshooting Laptops, Tablets, and Mobile Devices
06-30-2022, 08:45 AM
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Replies: 2
Views: 90
Re: Macbook Pro early 2011 - no audio
Board number would help. Track/via damage is the most likely suspect around that area. Via's can be underneath the resistor track pad itself or the test point. If one end of that resistor is going...
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Forum: Troubleshooting Desktop Motherboards, Graphics Cards, and PC Peripherals
06-22-2022, 05:38 PM
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Replies: 0
Views: 109
Giada embedded PC DE67
Customer brings in this embedded PC DE67-N1-7200 made by Giada (Giadatech). It's completely dead. Just a little over 2 years old and just out of the extended warranty he purchased.
Was only...
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Forum: Troubleshooting Laptops, Tablets, and Mobile Devices
06-20-2022, 11:40 PM
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Replies: 7
Views: 203
Re: How can we prevent 19v entering SOC?
The OEM's could put an avalanche diode or some other voltage transient device in there if they wanted to. But they don't. And they could have insisted Intel et al to keep using socketed designs...
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Forum: Troubleshooting Laptops, Tablets, and Mobile Devices
06-09-2022, 08:35 PM
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Replies: 2
Views: 131
Re: Lenovo NM-B421 carnage
Apparently the unit was dropped - can't see how that marries up with the damage seen. Anyway, ended up writing it off as likely to have CPU/PCH issues.
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Forum: Troubleshooting Laptops, Tablets, and Mobile Devices
06-09-2022, 05:56 PM
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Replies: 2
Views: 131
Lenovo NM-B421 carnage
Lenovo E480 with NM-B421 motherboard came in dead. Pulls about 300ma @ 20V via USB-C and no reaction to power button.
PU702 (NB691GG-Z) for +1VALWP was clearly shorted, along with PU801...
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Forum: Troubleshooting Laptops, Tablets, and Mobile Devices
06-07-2022, 05:06 PM
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Replies: 12
Views: 367
Re: DELL 3521 PS_ID Woes
I'd strip out all the protection stuff and recheck. PD901 is a diode clamp for ESD protection, PQ900 for over-voltage, PD902 a zener to again limit input voltage. In theory, removing all those...
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Forum: Troubleshooting Laptops, Tablets, and Mobile Devices
06-07-2022, 03:51 AM
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Replies: 12
Views: 367
Re: DELL 3521 PS_ID Woes
IIRC, the one wire chip in the charger gets its power from the laptop. When power is applied it sends out a small burst of data to identify the charger type etc. When I've looked at this previously...
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Forum: Troubleshooting Laptops, Tablets, and Mobile Devices
06-02-2022, 08:42 PM
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Replies: 18
Views: 593
Re: Surface Pro 4 doesn't turn on
+3PV3_EC is an input voltage to the embedded controller, it does not produce it. The reason you see it absent in some websites is that the EC was likely shorted in those cases. It is wrongly listed...
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Forum: Troubleshooting Laptops, Tablets, and Mobile Devices
05-31-2022, 07:26 PM
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Replies: 18
Views: 593
Re: Surface Pro 4 doesn't turn on
The hash tag (#) for a logic line indicates it's active low. VCCDSW_EN is thus active high so 0V isn't correct. It's early in the power sequence so this is likely an EC issue. Reflash the EEPROM with...
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Forum: Troubleshooting Laptops, Tablets, and Mobile Devices
05-31-2022, 04:57 PM
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Replies: 12
Views: 815
Re: Hp spectre x350 DA0X36MBAE0 no power
Yes true, however have no boardviews or schematics if things go awry. Would also have to replace at least one USB-C port and run jumpers for ripped pads too. Effort vs cost customer is willing to pay...
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Forum: Troubleshooting Laptops, Tablets, and Mobile Devices
05-30-2022, 04:49 PM
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Replies: 12
Views: 815
Re: Hp spectre x350 DA0X36MBAE0 no power
Just had a 13-AP0000tu come in with a DA0X36MBAE0 motherboard. Fault presentation was not charging. The rear USB-C port on the corner, only +5V negotiated when cable plugged in both ways. The other...
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Forum: Troubleshooting Laptops, Tablets, and Mobile Devices
05-29-2022, 09:38 PM
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Replies: 18
Views: 593
Re: Surface Pro 4 doesn't turn on
Follow the numbers on Pg5. The EC (which you have replaced) is responsible for most of the enables for the S5 power supplies, however this does require some feedback from the PCH in order to output...
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Forum: Troubleshooting Laptops, Tablets, and Mobile Devices
05-27-2022, 12:16 AM
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Replies: 18
Views: 593
Re: Surface Pro 4 doesn't turn on
Fair enough, haven't checked for ages but stand corrected.
https://www.badcaps.net/forum/showthread.php?t=97235&highlight=surface+pro+schematics
The IT8528 is the Embedded Controller (EC), not...
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Forum: Troubleshooting Laptops, Tablets, and Mobile Devices
05-26-2022, 04:17 PM
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Replies: 18
Views: 593
Re: Surface Pro 4 doesn't turn on
Surface Pro is not a good place to start to learn these kinds of repairs. There is zero support from MS and there are no schematics.
With no schematics, you have to rely on your knowledge on how...
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Forum: Troubleshooting Laptops, Tablets, and Mobile Devices
05-26-2022, 03:58 PM
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Replies: 7
Views: 273
Re: DELL VOSTRO 14 - LA-D822P Rev: 1.0
What BIOS version are you using? The OEM's have been issuing a number of BIOS updates recently to patch vulnerabities and some from Dell have been buggy. Use an earlier version to rule it out.
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Forum: Troubleshooting Laptops, Tablets, and Mobile Devices
05-25-2022, 05:45 PM
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Replies: 6
Views: 270
Re: Capacitor values in boardview
Have you noticed that only one side of this board has no values listed? It's possible that the boardview doesn't have these values, or it could be the way openboardview interprets the FZ file format....
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Forum: Troubleshooting Laptops, Tablets, and Mobile Devices
05-25-2022, 04:14 PM
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Replies: 7
Views: 273
Re: DELL VOSTRO 14 - LA-D822P Rev: 1.0
Check CMOS battery voltage. Does laptop start after a CMOS reset? Usually I'd try replacing the BIOS EEPROM (W25Q128FVSIQ) on spec. Normally when they're defective, they won't erase properly or you...
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Forum: Troubleshooting Laptops, Tablets, and Mobile Devices
05-23-2022, 09:16 PM
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Replies: 14
Views: 563
Re: Why does PCH get shorted internally?
CPU/PCH are only made for 24 months tops for each generation. Most of the ones you see available online are pulled from old boards. Who knows if they work or not. If they don't, the vendor will blame...
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