Hello, on a Fuji camera, on the board of top command buttons and flash, at the input part of power, there is 3 components (black with square spot), they look like fuses, but on all 3, I measure resistances : 3K, 150K… They are not like the fuses : ok (0 Ohms) or burned (open).
Do you know what it is please ?...
corrize
Badcaps Veteran
Last Activity: 11-20-2023, 01:56 PM
Joined: 04-05-2021
Location: Paris
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What is this component pls ? It look like a fuse.
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Re: A funny fuse story – Lumix LX100 II
There was of something soldered on the pad, so I guess there was a cap. I just never saw the small 0402 cap blown. (The big component is an inductor).
I guess I will replace the fuse by the same original "O" one (32V 2,5A). The max power come probably from the direct charge via USB cable for charging a 1000mAh battery. So it probably don't has fast charge (not in the specs). So the fuse should protect 1A max réal at 7v. So 32V 2,5A seems alwready oversized if i'm not wrong ? -
Re: A funny fuse story – Lumix LX100 II
I checked that, I disassembled the two fuses, and you are right, there was one « O » fuse under. And it is blow. (The G one is good).
I’m not convainced for the cap, the missing cap is a 0402 one. Too small for blow for me. The big one on the picture is ok and untouched. But possible.
When I pushed a little bit the 2 fuses soldered, they left alone from the board. So bad solder. Maybe the camera repair man did a bad solder and accidentaly moved the cap too ?Leave a comment:
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A funny fuse story – Lumix LX100 II
Hello, I disassembled this dead camera, and found this WTF… Two fuses soldered one above the other !
I was pretty sure nobody touched it before, but that can't be from factory. There is flux, and capacitor is probably missing.
The other weird thing : the fuses are « G » fuse : (0.75A – 8V), seems very low. The original fuse should be « O » : (32V 2,5A).
There is « O » mark beside. All fuses have the same mark letter on main board. So, I can deduce it's a « O » fuse.
And this correspond to the issus I saw : when I plug the battery, I measure the voltage dropping... -
Tips for reduce shaking ?
Hello, I have a little problem. When I use hot air, I'm shaking a little with tweezers, and I'm scared to push a little qfn for check if it floating. So sometime, I prefer to not try and « hope » the solder is done.
I use the blue tweezers mechanic AAC-14 and a I put just my fist on the table.
Do you have tips to reduce shaking pls ? Maybe shorter tweezers, or something for wedge the fist or arm ?
(I add : no coffee, no alcohol and I don't smoke). -
Re: ASUS UX450FDX REV 2.0 Need Schematics ans boardview
Hello, up for UX450 or UX480 pls ?Leave a comment:
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Re: Nikon D5 – dead, power board issue ?
Update : I connected only the boards with stand by 3.3v (and the top cover with the power on button). And without the motherboard.
And when I press the power button, the screen display goes on.
But it is just the display on, the battery symbol turning in loop and give no information.
After, I connected the motherboard, the battery symbol seems indicate a level stable.
But I noticed the PMIC (ADP5080 or ADP5080ACBZ, see the first post) is burning.
I guess, the PMIC has received the enable signal from...Leave a comment:
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Re: What are these components pls ? in the DSLR nikon
The board works. Not yet all the DLSR but that means these components are ok. So I don't need anymore to identify, thxLeave a comment:
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What are these components pls ? in the DSLR nikon
Hello, in a Nikon DSLR D5, I'm following the stand by 3.3v line and the first component is the 555, I don't know what is it ? But it seems working, the 3.3v go out.
And it go to the little 3 pins component with marking code "30". It is weird, at the 2 pins (same side), I measured 3.3v and at the third one : 0v. So that could be a negative comparator.
I didn't find what is it ? Can you help pls ?... -
Asus Zenbook UX433F UX433FA wifi up and down and chip hot
Hello, on this laptop, the wifi can be up and stop working. I noticed it never works without battery, except long time after I remove the DC jack, and it stop to works (Bluetooth too). It diseapper to window and still 2 exclamation points in the device list.
The wifi chip is hot when the laptop is on.
I made a bios update but the same.
That could be a thermal issue, I measured 2 caps shorted (0 Ohms) beside the chip (+3V_WLAN according the bordview), but not since (so I have doubt what I saw). After, I measured 50 Ohms when battery plugged and K Ohms... -
Re: Small and robust multimeter probes
Certain ? Can you check if it the same model number, and try to pull hard ? Maybe that very adjusted ? Or maybe it is a new model ?Leave a comment:
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Re: Small and robust multimeter probes
With replaceable tips, that seams good, thanksLeave a comment:
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Small and robust multimeter probes
Hello, I search a new probes for measuring pin of qfn and other very small stuffs. I bought the AE basics ones, but they are no longer sharp. Metal is bad. Do you have a stonger ones ? -
Re: Laptop Zenbook UX480 Fuse L
Update : since the last time, I recovered 1.05v at PCH coil.
So, the voltages that was present : 3v, 5v, 1.8v and 1.05v.
« Was » because I replaced the ram memory driver chip (richtek 5E=) because oxydated and I loosed 19v rail. Now, the resistance at DC jack shunt resistor is something like 182 Ohms, the same as the ram memory coil.
I checked ; I have 0 Ohms between DC jack shunt resistor and the ram memory coil, so continuity.
That’s means the 19v was able to reach ram memory ?
I can’t understand...Leave a comment:
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Re: ASUS UX450FDX REV 2.0 Need Schematics ans boardview
Hello, up pls, do you have schematics and boardiew ? Or UX480... there are very very close. ThxLeave a comment:
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Asus zenbook duo UX481F bios pls ?
Hello, when a laptop try to start with « all system power good » signal ok, and shut down, that could be a bios issue pls ?
And there is a way to see in the bios file if the program is corrupted ?
If it is relevant, could you provide the bios file for the Asus Zenbook DUO UX481F i7-10510U - 16Go with Nvidia MX250 2Go
Motherboard : UX481FL Rev 2.0
If I have to desolder the chip, I will post the bios file here.
I add : someone requested bios file here, and don't know if I can use this file ?
[url]https://www.badcaps.net/forum/showthread.php?t=111763&highlight=UX481F[/url]... -
Re: Laptop Zenbook UX480 Fuse L
Update : I replaced bios and I saw for the first time the charging LED on, and when I press the power button, the power LED on. So that was a bios issue.
But now, even with the power LED on, the laptop don’t start, all coils are 0v (except 3.3v 5v and 1.8v), (I don’t plugged the battery).
I have not yet started a new diagnose.
Before, I wanted to ask you if that could be a corrupted or bad bios or not pls ? Because I have no experience of bios issues.Leave a comment:
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Re: Asus Zenbook DUO UX481F – small water damage and thermal paste
Update : indeed, VCC core was missing, I found a bad solder on CPU mosfets. Now, solder is good, I checked on all pins.
New test : when I plug the charger (without battery), the chargin LED goes on, and next power LED on, it goes off after a few seconds.
I measured VCC core at coil, It grow up very briefly like all other coils voltages (pulse) at 0.8v, and goes to 0v. (So VCC core is « present » now, it was missing before).
So all other voltage, even the dedicated GPU have a same pulse...Leave a comment:
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Re: Asus Zenbook DUO UX481F – small water damage and thermal paste
I'm searching the cause of boot loop with measurments :
The PSU consomption : 10 – 100mA
I plugged an USB key and when the LED flashing very briefly, the boot loop restart instantly.
The 5 coils above chipset/CPU :
1 coil : 1.8v : stable
1 coil : 1.06v stable
1 coil : 0 to low voltage, but unstable
2 coils Vcore : 0v (don't try to start)
At coils of 3.3v 5v chip :
1 coil : 3.42v (stable)
1 coil : 5.18v (stable)
...Leave a comment:
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Re: Asus Zenbook DUO UX481F – small water damage and thermal paste
Update : I replaced the charging chip and the same, except BATSRC and BATDRV : 8.38v instead 0.2v (without battery).
The laptop behaviour is nearly the same. The power light blinking...
I'm focused on something weird : there is a chip 5E= a step down controller at up-left on picture. This chip is usualy for power supply Ram memory but I guess not in this case. It close the chipset, and provide (via 2 mosfet) the second coil (up, left of the board on the picture) mesured at 1.06v stable....Leave a comment:
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