Re: Mini pc board no charging, no lights.
Dyna I am happily married and with many kids but I must tell you that I really love you. Sorry my buddy.
You really saved me.
Thanks to fellow Brit SMD as well for the kind help too.
I don't think this is the only problem I have with the board. I think It's either a chip, a mosfet or both. I have an idea though but will share once I manage to fix this.
Cryogen
Senior Member
Last Activity: 07-19-2023, 01:53 PM
Joined: 01-22-2015
Location: Edinburgh
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Re: Mini pc board no charging, no lights.
I agree. What do you mean exactly though? Opting for a 3.5pF cap or going for a slightly higher/lower esd diode?Leave a comment:
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Re: Mini pc board no charging, no lights.
Without the schematics I will never know. What if I just solder a 3.5pF cap on those pads instead?...Leave a comment:
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Re: Mini pc board no charging, no lights.
Thanks for that.
I narrowed the search down to this SD05C TVS.
The only value I see way off it's the junction capacitance at 200 pico farad against the 3.5 stated on the original ones.
Will that really make any difference?...Leave a comment:
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Re: Mini pc board no charging, no lights.
breakdown voltage 10v
yep, seems about right. It's right next to the charging usb-C. he told me the 15v psu it came with it's pretty nasty cheap looking.
Do you know where can I get a pair here in the UK?...Leave a comment:
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Re: Mini pc board no charging, no lights.
Hi it's a Chinese generic mini pc not a laptop. I am trying to fix this for a friend, I only have the mobo and checking voltages and traces.Leave a comment:
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Re: Mini pc board no charging, no lights.
Anyone?
A help with the rating of those 2 diodes?Leave a comment:
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Re: Mini pc board no charging, no lights.
Hi
Pic. Does b stands for bidirectional? Cause it looks like a bi zener....Leave a comment:
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Re: Mini pc board no charging, no lights.
I found 2 blown/cracked esd diodes as well
"5b" marked. Anyone could give me hint where to get them (alternatives welcomed). Don't want to jump them.
ThanksLeave a comment:
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Re: Mini pc board no charging, no lights.
Hi
Pics.
You can see in the second pic I have removed the mosfet giving me 11.9 volts. I think the culprit might be the other one since I can only find 11.9v from the drain of the one I removed to the gate of the one I left on....Last edited by Cryogen; 07-15-2023, 07:41 AM.Leave a comment:
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Re: Mini pc board no charging, no lights.
Removed the mosfet and it still gives me continuity on the pads. All the caps that are not receiving current from the mosfet I removed are giving me a short on the multimiter.Leave a comment:
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Mini pc board no charging, no lights.
Hi
I have this mini pc board who refuses to charge and it is completely dead. No charging light would come on when plugged in.
The battery shows 11.95v from the 11.85v nominal
There are 4 mosfet (2 front and 2 back of the board) near the battery connector. only one gives 11.95v readings the other 3 show 0v.
Is the one reading 11.95v shorted? Or the one showing 0v next to the 11.95v readings that it is the culprit?
edit: the one with voltage is showing a short on gate, drain and source as well.
ThanksLast edited by Cryogen; 07-15-2023, 03:09 AM. -
Re: Lg led projector burnt led driver
I got that but how, which tool should I use?...Leave a comment:
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Re: Lg led projector burnt led driver
Ahhhh I see!
I have never done traces in my life this way, which tool do you think should I use to scratch the traces open? Fine sand paper?...Leave a comment:
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Re: Lg led projector burnt led driver
So it looks like 5 can be bridged. 8 and 10 go to respectively c506 and c505 and probably pin 9 to c504 on the back.
What do you think?...Leave a comment:
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Re: Lg led projector burnt led driver
By all means.
Sometimes I get a bit frustrated. The last 4 months has been really stressful at my workplace.
I apologise....Leave a comment:
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Re: Lg led projector burnt led driver
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Took better pictures.
Please note again. The last picture shows the 2 thermal pads which left those gooey marks who you assessed as "carbonized traks and pads".
the thin one goes beneath the led drive chip and the thick one above the 3 white resistors (where the residues are). They are parallel mounted as I think the 3 resistors heat up quite a lot....Last edited by Cryogen; 07-29-2020, 09:43 AM.Leave a comment:
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Re: Lg led projector burnt led driver
Sorry mate, I got frustrated by the other foul mouthed guy. I have nothing against you, sorry for dragging you in.
I have reported him and I will just ignore him from now on.
As I specified, I have it in front of my eyes and I can see no other burnt points apart of the usual 4 pins on the led drive.
I am gonna take a better picture tomorrow....Leave a comment:
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Re: Lg led projector burnt led driver
There are no "carbonized points" on the board. Just 4 damn ic solder points who disappeared after the short.
I have enough. I think I will manage by myself like I did many other times. I am just wasting time with people who see something that it is not there....Leave a comment:
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Re: Lg led projector burnt led driver
First of all, are you trolling? That's not what Diah pointed out.
Second AGAIN are you trolling?
I ALREADY TOLD YOU THAT WAS THE OLD PICTURE PRIOR CLEANING THE BOARD!
This is the picture taken after I cleaned up with rubbing alcohol.
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The only burnt part is the one on the texas instrument led drive.
What did you do? YOu saw me answering the focal fire post after 5 years and then came looking for...Leave a comment:
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