bogart219
Senior Member
Last Activity: Today, 11:13 AM
Joined: 05-09-2009
Location: ohio
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Nevermind. I found out these are TVS or ESD diodes. thanks.... -
Hello.Still working on this problem little by little each day, reading and studying. The main thing I'm trying to accomplish now is following the 5 volts from the usb-c jack and see where it stops.
Can you identify what kind of diode this is?
I believe the diodes in this picture are are back to back avalanche diodes in one package. What is the purpose of this setup? I'm assuming one of these is the usb-c protection chip (if this board has one that is).
Thanks!...Leave a comment:
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Hey Septh, thanks for joining in, any help or suggestions you have are most welcomed and appreciated
To try and answer your questions:
" Was the EC rom checked for PD firmware or is there another proof that this is the case here for sure (100%)?" I have no idea what your talking about here.
"The battery is still charged enough to power on the device?" The battery is charged up but doesn't turn on the laptop anymore. It did at the beginning of this post.
"]No 20V at VBUS anymore in combination with pulsing ALW voltages most...Leave a comment:
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Thats cool . I've been a member of this message board for over 15 years and this is really the first time I ever posted a problem here that I can remember. I just wanted to make sure I was following the rules and procedures . Sephir0th help is most welcome...
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WoW,Mich, that just about sums it up. Great explanation on the bios being the problem, I got that out of my head. No doubt putting on those wrong mosfets and TPS chip is where all the trouble started . I'm going back to the beginning of this post and starting over reading it again. Maybe I'll get lucky.
I'm typing this on my desktop which I use in the morning, my laptop I use in the evening while watching tv.
that $50 dell Inspirion 15 you helped me unlock the bios pasword works great. I put in a SSD drive I had and upgraded the ram to 16gb. I'm using Linux Mint on it and its...Leave a comment:
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I hear you brother and your right. I wanted to see and learn if I could take on the process of micro soldering and smd repair on circuit boards. Obviously I have failed so far but I will not give up yet. What I spent on equipment and supplies to accomplish this, I could of bought a new laptop like the one I'm trying to fix. My whole problem from the start might of been a corrupted bios from a windows update but I ended up going down a rabbit hole. I'm a 70year old retired who wanted to make this my hobby so I have something to do in my old age.
As far as this laptop I'm trying to fix goes,...Leave a comment:
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OK, thanks!...Leave a comment:
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I noticed what looked like rosin oozing out of the CPU at the four corners. anything to be concerned about?
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Ok Mich, I'll keep at it. Thanks for the info on the coils!Leave a comment:
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Hello again. I haven't given up yet. I'm still looking over this board looking for something thats not quite right. I was focusing on components that looked liked they had a change in color, maybe indicating something going on. Probably nothing but I found a couple of inductors that looked like they got hot maybe.
I measured the inductance of each of these three inductors. I used my zoyi zt-md1 tweezer tester at 10K.
PL5301 - 2.0 SHOULD BE 2.1
PL6501 - .9 SHOULD BE 1.0
PL3001 - .4 SHOULD BE 47 HMM WHY SO LOW? The inductor was measuring 172 ohms to ground...Leave a comment:
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Thanks again for the info, I got some studying to do
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Ok, I hear what your saying, I'm just Leary about getting used parts but might end up going that route , have to keep looking. It would be nice to find similar laptop with a busted screen for a $100 bucks or something.
This motherboard has two bios chips on it, one is a backup supposdlly so if there was a problem, the board would use or load from the backup I'm assuming. Which one would you even program?
In the mean time:" At this point we have to focus on getting the voltages first, why there's no 3.3V and 5V"
This is exactly what I was thinking.
Being...Leave a comment:
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Just got back from the computer shop. The guy was very nice and accommodating but basically didn't want to mess with it. He said, which is probably true, that the time he took troubleshooting it I would be better off getting a another motherboard. I think this place does a lot of board swapping when they can instead of doing SMD work, is the impression I got. I'll just keep F'n with it.
One thing he acknowledge that a windows update can corrupt a up a bios and Sorin said the same thing. I think I'll get one of those CH341A programmers and play with that, nothing to lose at this point.Leave a comment:
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Well it seems we've come to a dead end as far as me being able to repair this laptop. It was a learning experience. Thanks to Mich for sticking with it this whole time and a shout out to Mon2 for his help in the beginning.
I'm taking it to a computer repair shop today and see if they can figure it out. I will post back when I have the final verdict. Thanks again!!Leave a comment:
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Hey Mich, off topic but can you tell me what you think of this ? A person on craigslist has a Dell inspiron 15 3000 intel 13 8th gen - $50. Here is what they said about it: "bought from friend who who passed at estate sale was given list of pass words none worked will be a great computer if you can unlock not stolen people live in my park".
Is there a way I can get around this? Fixing my Levono doesn't look too promising at the moment. Thanks again.
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Wow, thanks Mich for the detailed explanation. Thats a lot to digest, I'm going have to think about that. So it appears that there is nothing shorted (at least drawing any current), its more like a component isn't working. I did order one of those RT6585C chips.
I did find 5 volts at different places but no 3.3 volts. what do you think I should try next?...Leave a comment:
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Just to clarify, so when the TPS negotiates the 20 volts, it sends that voltage to the mosfets below it? I'm trying to see which way the current is supposed to flow? when working properly, what should the gate voltage be on those four mosfets? Two are high and two are low correct? ...Leave a comment:
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I'm trying to wrap my head around this PD controller having to "negotiate" with the power adapter. So I got 5 volts to certain places. This schematic is confusing for me to understand. for instance, I'm trying to to follow the the inputs and outputs of the Pd controller chip. As seen in this shot, These pins on the Pd should be 5 volts. They are all 1.3 volts on mine. There are some pins that have 5 volts.
How do you tell the inputs and outputs on this chip? where is the main power rail on this board? Where did that 1.3 volts come from? Thanks...Leave a comment:
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DID.
Well Mich, we're pretty much back to where we started. The USB meter is is no longer flashing and showing 5 volts again after I put those components back on being more careful. Still the voltages are missing at those locations you pointed out.
5 VOLTS - PJ6206 - 1.3 VOLTS 3 VOLTS - PJ6201, PL6201 & PIN 32 ON THE TPS chip = all 0 volts.
CU201 - 1.3 VOLTS
PL6202 - 1.3 VOLTS
What do you think?...Leave a comment:
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Thank you Mich!...Leave a comment:
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