Great video Mike. What do you think about the PCH failures though. Is it a flaw in the PCH design (Intentional or not) or in the power lines supplying the PCH ?
If you ask me, then it is a Design flaw of the PCH itself, which can not compensate the smallest deviations. The burned PMICs are often just a symptom of a power rail which takes to much current. It overheats and finally dies.
@@fairrepair_enΙ tend to believe the same because the power lines can be designed to the smallest detail (if the cost is not an issue) in order to prevent even the tiniest deviation but the PCH as an IC should also have it's own protection and tolerances in order to protect itself since it is actually one of the most fundamental parts in a PC. Thanks for the reply Mike.
Hi there ! Really diggin' your videos. You and Sorin are my source of electronics repair knowledge. Always learn some new tidbit from both of your videos :) Really appreciate you sharing your expertise so openly with ppl. Others try to gatekeep their knowledge. Could you explain, why did the PL402 on the Acer board raise your suspicion ? Was it because it went from 400'ish Ohms down to 120'ish and then kept going lower and lower ? Or was it something else (maybe a hunch) ?
Im no expert, but basically you will never see 150 ohm on 3v or 5v power supply coils, those should be at least 1k or more, this guy just knows which coils to measure first, if u measure cpu, gpu or ram coils they tend to go much lower and thats fine, it all comes down to experience with many laptops
It is true, the Inductor so far away from CPU and GPU, if not related to RAM supply, is clearly suspicious. This is why instantly digged into that. Best regards.
@@fairrepair_en So just to be clear, the coil is suspicious because, as @ps-ib6ct said, it had way too low of a resistance ? Or was the resistance a non-issue as you were already looking for the 3V supply with the intention to inject voltage to see what's getting hot ?
@@ps-ib6ct Thank you for your reply. Yeah, experience is something I currently lack which is why I try to figure out how ppl with way more knowledge and experience go about diagnosing faults. Here I was simply puzzled why this particular coil got the attention it did.
The first problem is to source a known working BGA for a reasonoble price which was not already "fused" to another board. Keyword: "bootguard". The second problem is the necessary rework itself, which requires experience and good equipment and still there is always a decent chance to fail. Best regards
@@fairrepair_en yeah, was just considering the economics of such a repair. i have seen enough videos of Sorin to know that most of the time such job is not worth it, specially with how the market involves parts that are just also sourced from dead motherboards.
This may be a dumb question to ask i guess. can the designers put Zener diodes at each coil to limit the voltages in case the high side mosfet get shorted it will prevent from high voltage going in to the PCH or the Processor?🤭
This isn't a dump question and such Designs are actually implemented in some boards. However even a fast acting fuse often does not manage to save a completely semiconductor like a CPU or PCH from permanent damage. Best regards.
And even TVS diode won't help much if high current. I recently made DIY power supply from builder transformer and chip blown instantly, TVS just got hot
Hi , love your videos, do you fancy taking a look at a large heavy boat anchor of a laptop code named Anchor Bay on the schematics. HP Zbook 17" G6 Zeon with RTX5000. I have the schematics and boardview. I'm in Japan but could maybe afford DHL to you and back and would obviously pay you if you can fix it. I already changed the EC chip but no change with power button LED single flash. power light is on, caps lock stuck on. 5v 3v power exists but power PWR_GOOD_3 is low. ordered a new comparator in case its that. EC BIOS I tried programming. it programs but when I switch on board and power on it appears to read 0xFF's I used the evil in circuit programmer clip you warned against using in another video but unfortunately watched your video afterwards! No worries if your already over loaded with laptops , maybe I am a bit late to the party .. I just thought this one might make an interesting fix video. I can double check the PCH is not shorted also before I send otherwise it might be a miserable time haha :)
First of all, thank you for your positive feedback and your trust in our services. I would like to agree immediately, but there are some uncertainties to consider, such as the transportation of a Li-Ion and LiPo battery by air per se and which shipping service providers allow this at all. The value of the device is not just peanuts and customs could throw a spanner in the works. For this reason, I have deliberately excluded third countries from our services, including EU countries that can only be reached by airmail. If you are prepared to bear all risks and any costs that may be incurred for the outward and return transportation, please contact me at info@fairrepair-germany.com I will then try to work with you to minimize all uncertainties as far as possible. Best regards!
I think no-charge diagnosis is not a good business model. It is not your fault that the PC is unrepairable/not economic to repair, so why should you pay with your free diagnosis time.
Oh yes, I do agree. It just for the start. As soon as there is something like a flow about the incomes I will probably change something here and there in the business model. Thanks for the comment.
Master .you are great .in every vedio we learn new things❤
Yes, Mike is right. We see so many PCH failures and it is very sad 😞
Mike, you recently helped me on DD diagnosing a (surprise surprise) dead PCH on a Lenovo Y700. Here to support you in return. Nice setup too :)
nice quick straight fault finding, good job 👍 greetings from WHV
Good work 😎👌🏼
Thank you my friend! :)
it is what it is ... sometimes you get good jobs sometimes bad ones ! GG brotha
good teacher. i always like
j'aime bien votre explication
vous êtes le meilleur .............🥰🥰🥰🥰🥰🥰🥰
Great video Mike. What do you think about the PCH failures though. Is it a flaw in the PCH design (Intentional or not) or in the power lines supplying the PCH ?
If you ask me, then it is a Design flaw of the PCH itself, which can not compensate the smallest deviations. The burned PMICs are often just a symptom of a power rail which takes to much current. It overheats and finally dies.
@@fairrepair_enΙ tend to believe the same because the power lines can be designed to the smallest detail (if the cost is not an issue) in order to prevent even the tiniest deviation but the PCH as an IC should also have it's own protection and tolerances in order to protect itself since it is actually one of the most fundamental parts in a PC. Thanks for the reply Mike.
Send these boards to me in Canada, I replace these chip's!
Thanks for the video :)
Hi there ! Really diggin' your videos. You and Sorin are my source of electronics repair knowledge. Always learn some new tidbit from both of your videos :) Really appreciate you sharing your expertise so openly with ppl. Others try to gatekeep their knowledge.
Could you explain, why did the PL402 on the Acer board raise your suspicion ? Was it because it went from 400'ish Ohms down to 120'ish and then kept going lower and lower ? Or was it something else (maybe a hunch) ?
Im no expert, but basically you will never see 150 ohm on 3v or 5v power supply coils, those should be at least 1k or more, this guy just knows which coils to measure first, if u measure cpu, gpu or ram coils they tend to go much lower and thats fine, it all comes down to experience with many laptops
@@ps-ib6ct absolutely! :)
It is true, the Inductor so far away from CPU and GPU, if not related to RAM supply, is clearly suspicious. This is why instantly digged into that. Best regards.
@@fairrepair_en So just to be clear, the coil is suspicious because, as @ps-ib6ct said, it had way too low of a resistance ? Or was the resistance a non-issue as you were already looking for the 3V supply with the intention to inject voltage to see what's getting hot ?
@@ps-ib6ct Thank you for your reply. Yeah, experience is something I currently lack which is why I try to figure out how ppl with way more knowledge and experience go about diagnosing faults. Here I was simply puzzled why this particular coil got the attention it did.
I have an Acer Predator G9 793 , the fan is spinning, the keyboard light shows but the screen won't display.
is it worth it to replace newer laptops that has PCH fault? or there could be other problems that may show up after succesfully replacing it?
The first problem is to source a known working BGA for a reasonoble price which was not already "fused" to another board. Keyword: "bootguard".
The second problem is the necessary rework itself, which requires experience and good equipment and still there is always a decent chance to fail. Best regards
@@fairrepair_en yeah, was just considering the economics of such a repair. i have seen enough videos of Sorin to know that most of the time such job is not worth it, specially with how the market involves parts that are just also sourced from dead motherboards.
This may be a dumb question to ask i guess. can the designers put Zener diodes at each coil to limit the voltages in case the high side mosfet get shorted it will prevent from high voltage going in to the PCH or the Processor?🤭
This isn't a dump question and such Designs are actually implemented in some boards. However even a fast acting fuse often does not manage to save a completely semiconductor like a CPU or PCH from permanent damage. Best regards.
I'm not an expert but if I properly understood zenner only serves to keep voltage in range , it won't protect against surge. For surge need TVS diode
And even TVS diode won't help much if high current. I recently made DIY power supply from builder transformer and chip blown instantly, TVS just got hot
@@QARepair Thank you for your reply. I'm also not an expert on this.
❤.Request a video teaching us how to remove glued pch on lenovo laptops without trace damage.😊
Milling machine. :D
@@fairrepair_en 😅🫡
Hi , love your videos, do you fancy taking a look at a large heavy boat anchor of a laptop code named Anchor Bay on the schematics. HP Zbook 17" G6 Zeon with RTX5000. I have the schematics and boardview. I'm in Japan but could maybe afford DHL to you and back and would obviously pay you if you can fix it. I already changed the EC chip but no change with power button LED single flash. power light is on, caps lock stuck on. 5v 3v power exists but power PWR_GOOD_3 is low. ordered a new comparator in case its that. EC BIOS I tried programming. it programs but when I switch on board and power on it appears to read 0xFF's I used the evil in circuit programmer clip you warned against using in another video but unfortunately watched your video afterwards! No worries if your already over loaded with laptops , maybe I am a bit late to the party .. I just thought this one might make an interesting fix video. I can double check the PCH is not shorted also before I send otherwise it might be a miserable time haha :)
First of all, thank you for your positive feedback and your trust in our services.
I would like to agree immediately, but there are some uncertainties to consider, such as the transportation of a Li-Ion and LiPo battery by air per se and which shipping service providers allow this at all. The value of the device is not just peanuts and customs could throw a spanner in the works. For this reason, I have deliberately excluded third countries from our services, including EU countries that can only be reached by airmail.
If you are prepared to bear all risks and any costs that may be incurred for the outward and return transportation, please contact me at info@fairrepair-germany.com
I will then try to work with you to minimize all uncertainties as far as possible.
Best regards!
I think no-charge diagnosis is not a good business model. It is not your fault that the PC is unrepairable/not economic to repair, so why should you pay with your free diagnosis time.
Oh yes, I do agree. It just for the start. As soon as there is something like a flow about the incomes I will probably change something here and there in the business model. Thanks for the comment.