ferah831208
Senior Member
Last Activity: Yesterday, 10:15 PM
Joined: 08-29-2019
Location: La Habana
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Sy8370 is DFAF or CUHF?? Sorry for the question but marking is a reference to CUR, I guess this could be CUHF ??? 🤷🏻♂️🤷🏻♂️, do u have info for DFAF?? I don't find anything... -
identify components in mb LA-M788P from HP Victus
Hello there I need help identifying this components, one of this is probably shorted, because it has low impedance measuring coil from vout to GND, I suspect it might be 5 or 3v but not sure, I don't find any references to this marking codes. If someone has any info please let me know. DFAF JB, CUHF JC. It is from a HP Victus laptop DDR5 CPU AMD. There are no schematics or boardviews for this model, and no datasheet. I read something this chips were proprietary manufactured 🤷🏻♂️. Cannot find even where to buy it 😔. -
Hello there I need help identifying this components, one of this is probably shorted, but I don't find any references to this marking codes. If someone has any info please let me know. DFAF JB, CUHF JC.Leave a comment:
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Update on this topic. I finally managed to fix the laptop after lot of research. I found the best info in Vertyanov's support telegram chat. For some reason nobody knows for sure, there is an issue with this series of ITE chips, but apparently they have this strange behavior in Lenovo laptops. The problem is related to a tag the chip must have (L005, L003, etc) at the bottom after all the numbers, I don't know if this is related to some special code or verification they include at the factory or what, but there is a table where u can find which tags are tested in specific motherboards so u can...Leave a comment:
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U can programm the chip in that case via i2c. The problem with those chips are u need to look for another number, L00x at the bottom of the chip, there is info about this in Vertyanov telegram channel...Leave a comment:
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Uffff that's really not a good news 😔, but at the same time that's really enlightening , do u remember the forum?? Maybe I can dig for more info, I don't have a scrap for this, and now I'm doubtful about ordering again and having same issue. I will need to check again how temp batt is measured, but at the end if there is a microcontroller issue or incompatibility that's not something that can be fixed. It's definitely not a firmware problem, what u say I imagine is some misbehavior at registry level when reading battery BMS through smbus 😐😐. Do u know any other suppliers for this chip...Leave a comment:
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U need mec1515 from same donor board I never found the way to purchase the chip original from Dell 😔Leave a comment:
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Chip is it8227-192 CXA same as original 😐, of course always could be a faulty chip, I ordered it in AliExpress from a rated seller where I always order chips for repairs, but that can be a possibility, maybe I will order another one but I'm doubtfulLeave a comment:
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[QUOTE=reformatt;n3598658]My inclination is to re-examine the EC, as it does communicate with the BQ chip via SMBUS. Quick look on Alixpress, there are two variations of the IT8227E with 192kb firmware, BXA and CXA. Confirm you have the right one and go over each pins soldering with a fine tooth comb. Check your SMBUS lines as well.[/QUOTE
Hmmmm 🤔🤔🤔, haven't really noticed about the detail of BXA or CXA, only checked it was 192kb firmware version 😐😐😐, pins are tripled checked under the microscope and smbus communication looks OK on the oscilloscope, I will check about EC...Leave a comment:
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i think there was a misunderstanding , is not .3v (like 0.3v), it is 3v like in high level, that's why I meant. Sorry for the confusion....Leave a comment:
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was my first thought but negative, charger is ok, id line is perfect, i have a theory about why EC was damaged but it could be also bad luck...Leave a comment:
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Voltage to ground is stable when i plug ac connector, the weird thing is when battery is attached (without ac power supply), regn is cycling on off all the time, in theory regn only ia active when vcc is above UVLO, and acdet pin is above 0.6V, that of course it is not when ac is not connected, that's why i changed the bq24780s but same result. When i try to turn on the laptop with the battery it turns on and off quickly. With other batteries it turns on (but if i plug they don't charge), battery may be damaged but if i plug this battery in another model of lenovo, is not charged, but in those...Leave a comment:
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Update on this topic, I have tested 5 different batteries, four of them are from Lenovo legion laptops that have been repaired in my workshop. Another from a regular Lenovo model. All of them have been recognized in this laptop reading All data from BMS, with different percentages of wear. The original battery of this laptop tested in any of those laptops does not charge but is recognized and and turns on perfectly, only I get permanently the orange led flashing, in the only laptop that does not turn on with the battery is in the original one that gives the fault that I explained in previous post....Leave a comment:
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Strange battery present behaviour in Lenovo Legion 5-15ARH05 mb model nm-d041
Hello guys, i need help with this problem, I have a NM-D041 mobo, it came with low impedance in 3v linear regulator rail, the cause was a damaged EC controller ITE8227e-192. I ordered a new one and replaced it. This laptop have a different chip for keyboard management and it8227e pins for programming ITE chips are not accesible through keyboard interface, I flashed it using i2c interface pins with vertyanov programmer because laptop was dead and SPI flash didn't have power (only 3v EC) so it couldn't access firmware stored in SPI memory. I read SPI and extracted it8227 firmware from original BIOS... -
Thanks mate, this one is ddr5 and that schematics is ddr4 but I guess models are really similar and platform can have some changes but I don't think it could be that different. I guess I have the vddcr_soc phase damaged 😭. I don't have a tested CPU for replacement from a donor board, and prices are really high with no guarantee, so I guess, it's going to my donor board box 😐....Leave a comment:
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help with AMD Ryzen 5 7535hs power rails
Hello there, does anyone have info about AMD Ryzen 5 7535hs power rails or an schematics from a compatible CPU?. I have a quanta G3PR from a HP victus laptop, I suspect cpu is damaged but I would like to know what power rail is the one I guess is damaged. There are 4 coils aprox 4.2 ohm to gnd in parallel next to CPU (I guess vcore) ,one coil same size next to those 4 around 0.7ohms to gnd (damaged rail I guess), and other two smaller I guess associated to less current power rails for CPU logic purposes. Anyone have more specific info? I attached picture. -
And when u buy this chips in AliExpress they are always blank I think 😐😐, laptops with this chip are a big headache 😔...Leave a comment:
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Do u have any link where u can buy this chio ready to attempt that procedure?? I have the same issues with mec 1404-nu I think 🤔 🤔, and I read a lot online and a thread from Vertyanov speaking about this specific chip, a blank chip doesn't work. But in that case supposedly if you use a chip from a donor board it will work. Now I have the same problem with a mec1515, bought a new one in AliExpress it didn't work, only amber light when I press power button, I don't believe bios solution will work because of signals measured in scope, and now I see your explanation and it's the more logical....Leave a comment:
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By any chance u have any idea what component is this, it looks like a transistor sot23-6 marking 3013, but I don't find any logical datasheet that could match and the measurements are weird (I measured one out), it looks like double transistors for enable purposes, there is a whole network of this components connected, I took the first one out and forced enable for rt9018 and I got 3.3v and 1.05v from mp28275 but still no GPU voltage or vram, I guess there is a sequence problem but no schematics and I'm trying to understand the logic for this but I'm stucked 😔...Leave a comment:
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Thanks mate, I checked and datasheet matches chips pinout, I know now power rails they feed. I've been trying to find any info about this old video chip Nvidia Quadro, but I don't find anything, is there any info available?? At least voltages distribution or any schematics or boardview for reference purposes only....Leave a comment:
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