Thanks for the reply
I can replqce with a 5v1 zener diode smd which is 0.5 w
or 5v1 zener diode 1w which is through hole
I'm thinking if I replace with the 1w zenner diode it will add a bit more protection
any thoughts please
Thanks...
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Thanks for the reply
I will do that
does that mean the Zener diode would still be ok
After speaking to the person who gave this to me, to look at
They said they plugged in another cable that had the same connector but the power adapter was different
was not usb
I believe that this is why the TP4056 blew
I I replace the TP4056 and deal with the burn damage
will it work again or should I replace the zener diode as well with a higher one
Thanks...
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Usb rechargeable hair clippers blown tp4056 and zener diode
Hi
all
I have a usb rechargeable hair trimmers that should work plugged in and charge
it stopped working no led norhing
I've opened it up and see the tp4056 chip has blown
There is a zener diode that I tested and get a near short ohms reading no matter which way my leads are
I don't know what to replace this with
Please help
thanks so much...5 Photos
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Re: 820-2610-A Sys onewire help, no green light. Please help from the gurus
Thanks for the reply piernov
Really appreciate it very much
Do I replace U6915 as well as the transistors
The reason I am asking this is because I read that one blows the other and this keeps on happening
Thanks again...
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Re: 820-2610-A Sys onewire help, no green light. Please help from the gurus
Here are some more measurements
PPBUS_G3H 08.39v
PPBUS_CPU_IMVP_ISNS 08.39v
PPDCIN_G3H 16.63v
PP3V42_G3H 03.40v
PP5V_S3 0v
PP5V_S0 0v
F7040 08.38V
F6905 16.63V
D6900, PIN 1 0V
U6915 PIN 1 08.29V
U6915 PIN 2 GND
U6915 PIN 3 0V
U6915 PIN 4 08.15V
U6915 PIN 5 16.62V
Q6920, PIN 1 source 0V
Q6920, PIN 2 gate 0v
Q6920, PIN 3 drain 0v
Q6920, PIN 4 source 0v
Q6920, PIN 5 gate 0v
Q6920, PIN 6...
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Re: 820-2610-A Sys onewire help, no green light. Please help from the gurus
Hi
Below are the voltages i have got so far
My CHGR_ACOK voltage seems low
If someone can verify this. I will appreciate it very much
Thanks
PPBUS_G3H 08.39v
PPBUS_CPU_IMVP_ISNS 08.39v
PPDCIN_G3H 16.63v
PP3V42_G3H 03.40v
PP5V_S3 0v
PP5V_S0 0v
F7040 08.38V
F6905 16.63V
D6900, PIN 1 0V
U6915 PIN 1 08.29V
U6915 PIN 2 GND
U6915 PIN 3 0V
U6915 PIN 4 08.15V
U6915 PIN 5 16.62V
Q6920, PIN 1 source...
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Re: 820-2610-A Sys onewire help, no green light. Please help from the gurus
Thanks for your reply
This machine is close to me that is why i want to get it going
I know that it has life in it and it is only the one wire circuit that is not working
I just did some measurements now
I jumped the power on pads and got
adapter sense 0v
smc reset l 3.4v
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Re: 820-2610-A Sys onewire help, no green light. Please help from the gurus
Thanks for the reply
Do you still work on these old circuits, please
I know the SMC is working because when i try and do smc reset the magsafe blinks...Last edited by lcdcaps1; 11-06-2023, 04:05 PM.
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Re: 820-2610-A Sys onewire help, no green light. Please help from the gurus
Thanks for the reply
Yes using a genuine charger
No green light on magsafe
no display
I am sure something is wrong with the sys onewire circuit but need some help who knows the circuit well
As it is an old circuit not many people know about it or work on them
but i am hoping someone that knows the circuit can reply and help me
please
Thanks
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820-2610-A Sys onewire help, no green light. Please help from the gurus
Hi
I have an 820-2610-A motherboard that has no green light.
I have noticed is when I do a SMC reset the light on the Magsafe blinks.
From My understanding, the sys onewire circuit is responsible for the green light on the magsafe
The sys onewire circuit on this model and others is more involved
I was hoping if anyone knows about this and how it works, can reply and let me know
I know this is an old model but I am sure there are people who still works on these or knows about them
I get 1.1v on the C7771 capacitor and will replace...
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