hello guys i do not usually repair macbooks and i need help.. i have macbook 820-01041-a a1990 20v present on charger and it has 3.3v on the coil but the 5 coil isnot present.. does macbook board is similars to other boards ?? 3.3v coil =3kohms 5v coil = 900ohms,, 0.10amps on dc power supply any help is highly appreciated
-
Hi, I have a couple of AM4 b350 motherboard to fix .... I try to see what I got without installing anything (no memory, no cpu) and give them just 5V standby .... and I have a coil getting warm on both board near memory (1,2v on one, 1,35 on the second one). Is this somehow normal? Because It looks very strange to me.
And can't identify anything else getting particularly hot who can be the sink for this current ...
TIA07-02-2024, 02:06 AM -
I have old game console which have connected to 220v outlet by previous owner and It is not able to turn on.
I checked continuity of fuse in PSU unit with a multimeter which is shown in the below picture with a orange circle around it, and It seems that fuse became open circuit.
I also found that as well as bulging capacitor, there is unidentified coil which has residue all over its surface
unidentified coil which has residue all over its surface
I want to replace this round black fuse and unidentified coil if it got broken.
... -
Back in 2020 i bought a (2nd hand) compact ATX psu to replace my current one. My PC case only fits very short ATX power supplies so i didn't really have the choice of buying a decent 80Plus unit. The current unit is a modded YoungYear unit that i made a thread about a while ago:
A "nice" YoungYear unit? - Badcaps
The "new" unit is a KDM-M6480 480W psu, the 480W number is a typical KDM bullshit claim of course, but the 24A rating on the 12V rail seemed reasonable and the "Active PFC" claim gave me a bit of hope that this was going to be decent-ish.... -
Hi all,
Unfortunately I cannot/don't know how to edit my last query, so I'll create another one instead.
So I've received this laptop to try and fix it. There were 2 blown components - small inductor and cap, both on Vin (main power rail) on the IN pins of the 0.75V chip (SY8388RHC). I've replaced that chip and the nearby 0.75V_DEEP_SUS (same type), and of course both of blown components. There was still a short on 3V coil, which went away when I replaced PI3DPX1207C chip next to usb-c port (as it was overheating). Luckily I have older non-working 455 G7 for the spare parts....03-13-2025, 05:06 AM -
Hello everyone,
I'm trying to repair my old Acer Nitro 5 (AN517-54-55T5). I've already bought a new laptop, so this is more of a learning project. For the experience, with no high expectations of success.
Well, my decice specs are the following:
Model: Acer Nitro 5 AN517-54-55T5
CPU: Intel Core i5-11400H
GPU: NVIDIA GeForce GTX 1650
Motherboard: GH51G LA-L181P Rev:1c
The symptom:
When pressing the power button, the power LED lights up for about 5 seconds and then turns off. Initially, the issue was intermittent: sometimes...05-26-2025, 10:49 AM