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Search: Posts Made By: DanFen
Forum: General Electronics Technical Discussion 10-10-2021, 09:23 AM
Replies: 8
Views: 558
Posted By DanFen
Re: My Uni-T died... looking for a replacement

Electronics. Yeah I read about it, I'll probably create a dedicated thread about this, hoping to find someone who will be willing to assist with troubleshooting :)
Forum: General Electronics Technical Discussion 10-10-2021, 09:22 AM
Replies: 8
Views: 558
Posted By DanFen
Re: My Uni-T died... looking for a replacement

Thanks! I'll have a look at those Brymen, never heard of that brand before.

Definitely not worth paying hundreds in my case. Maybe the cost of these Brymen would be the max I'd pay. This is...
Forum: General Electronics Technical Discussion 10-10-2021, 06:29 AM
Replies: 8
Views: 558
Posted By DanFen
My Uni-T died... looking for a replacement

Hello people, hope you are all doing well!

I have a lovely Uni-T UT139C, which I've used during the past couple years, but has unfortunately died on me. It comes up with an ErrE error, and upon a...
Forum: Troubleshooting Laptops, Tablets, and Mobile Devices 01-13-2021, 01:16 PM
Replies: 14
Views: 666
Posted By DanFen
Re: Dell Inspiron 3537 - Powers Off

Now it's nothing, cause it literally exploded on me.

But I noticed that the EN2 was 0V again, PGOOD was measuring 0.1V at the time. Then I checked VIN, got 13.5V and it exploded :p:

I have some...
Forum: Troubleshooting Laptops, Tablets, and Mobile Devices 01-13-2021, 01:12 PM
Replies: 14
Views: 666
Posted By DanFen
Re: Dell Inspiron 3537 - Powers Off

So if I understood correctly, the sequence is more or less:

1. Ensure 19V (or whatever the voltage in is) is being inputted
2. I am not sure why we checked PR702, but I am assuming that the 19V...
Forum: Troubleshooting Laptops, Tablets, and Mobile Devices 01-13-2021, 01:06 PM
Replies: 14
Views: 666
Posted By DanFen
Re: Dell Inspiron 3537 - Powers Off

You're right :)

EN1 should be 5V right? I can only assume so because the trail says "5V_EN"

VIN > 13.5V
EN1 > 2.7V
EN2 > 3.3V
SW1 > 5V
SW2 > 3.3V
Forum: Troubleshooting Laptops, Tablets, and Mobile Devices 01-13-2021, 12:50 PM
Replies: 14
Views: 666
Posted By DanFen
Re: Dell Inspiron 3537 - Powers Off

Looks complex. Am I right to think that EN2 should output 3V?
Forum: Troubleshooting Laptops, Tablets, and Mobile Devices 01-13-2021, 12:26 PM
Replies: 14
Views: 666
Posted By DanFen
Re: Dell Inspiron 3537 - Powers Off

VIN > 13.5V
EN1 > 2.5V
EN2 > 0V
SW1 > 5V
SW2 > 3.3V

Question for you, how do you know what's the expected voltage? Is this by experience or by analysing the chip's datasheet?
Forum: Troubleshooting Laptops, Tablets, and Mobile Devices 01-13-2021, 12:05 PM
Replies: 14
Views: 666
Posted By DanFen
Re: Dell Inspiron 3537 - Powers Off

VREG3 and VREG5 seems fine, 3.3V and 5V respectively.

Am I right to say that this is the voltage step down chip that distributes the lower voltages to the rest of the circuits?
Forum: Troubleshooting Laptops, Tablets, and Mobile Devices 01-13-2021, 10:57 AM
Replies: 14
Views: 666
Posted By DanFen
Re: Dell Inspiron 3537 - Powers Off

Hey, thanks for the feedback!

Yes, PR702 seems fine, 19V is present in the area.



Just to clarify, it powers on fine (by fine I mean that display works, Dell logo is up, boot menu is up, and...
Forum: Troubleshooting Laptops, Tablets, and Mobile Devices 01-13-2021, 10:29 AM
Replies: 14
Views: 666
Posted By DanFen
Re: Dell Inspiron 3537 - Powers Off

Just bumping my own thread, checking if anyone can help me into the right direction. Thanks.
Forum: Troubleshooting Laptops, Tablets, and Mobile Devices 01-11-2021, 11:53 AM
Replies: 14
Views: 666
Posted By DanFen
Dell Inspiron 3537 - Powers Off

I've got this Dell Inspiron 3537, LA-9982P, can it powers on during POST (I'm guessing). Occasionally I get the typical Dell message complaining about not using the correct adapter with the right...
Forum: Troubleshooting Laptops, Tablets, and Mobile Devices 10-26-2020, 02:18 PM
Replies: 22
Views: 1,639
Posted By DanFen
Re: Troubleshooting a Asus X541UVK

Replaced coil PL8701.

IC PU8701 is still getting super hot.

Not sure if the below helps as it's a little bit hard catching up with your knowledge, but just in case:

Capacitor C3003 is...
Forum: Troubleshooting Laptops, Tablets, and Mobile Devices 10-26-2020, 11:43 AM
Replies: 22
Views: 1,639
Posted By DanFen
Re: Troubleshooting a Asus X541UVK

Thanks, will give it a shot.

Can you share how to decode the number? I tried to ask Google, but couldn't find anything that explains it.
Forum: Troubleshooting Laptops, Tablets, and Mobile Devices 10-25-2020, 04:00 AM
Replies: 22
Views: 1,639
Posted By DanFen
Re: Troubleshooting a Asus X541UVK

This is what I have has this code on them, but I don't know how to read them:

3R3 716 P1H
3.3UH/6.5A 20% CYNTEC/PEUB063T-3R3MS

What I've found from other boards I have laying around:

2R2...
Forum: Troubleshooting Laptops, Tablets, and Mobile Devices 10-24-2020, 04:00 PM
Replies: 22
Views: 1,639
Posted By DanFen
Re: Troubleshooting a Asus X541UVK

Will try to find a coil from a donor board. The problem is finding one that is exactly the same :D

If I may ask, what makes you think PU8701 is the culprit and not PU8702 when the beeps result the...
Forum: Troubleshooting Laptops, Tablets, and Mobile Devices 10-24-2020, 03:25 AM
Replies: 22
Views: 1,639
Posted By DanFen
Re: Troubleshooting a Asus X541UVK

Removed just one side of these coils, Pin2 of PL8701, and Pin1 of PL8702.

So in diode (beep) mode:

PL8701 pin1: beep
PL8701 pin2: no beep
PL8702 pin1: no beep
PL8702 pin2: beep

C3003...
Forum: Troubleshooting Laptops, Tablets, and Mobile Devices 10-24-2020, 02:49 AM
Replies: 22
Views: 1,639
Posted By DanFen
Re: Troubleshooting a Asus X541UVK

Yep, still frying eggs.
Forum: Troubleshooting Laptops, Tablets, and Mobile Devices 10-23-2020, 01:45 AM
Replies: 22
Views: 1,639
Posted By DanFen
Forum: Troubleshooting Laptops, Tablets, and Mobile Devices 10-22-2020, 02:46 PM
Replies: 22
Views: 1,639
Posted By DanFen
Re: Troubleshooting a Asus X541UVK

Short video attached.
Forum: Troubleshooting Laptops, Tablets, and Mobile Devices 10-22-2020, 02:30 PM
Replies: 22
Views: 1,639
Posted By DanFen
Re: Troubleshooting a Asus X541UVK

Hey, thanks for the help.

Resistance to ground on coils:

PL8701: 0.5 ohms
PL8702: 1.5 ohms

R3061: 0V on GND and 3.2V
R3015: 3.2V (both ends)
Forum: Troubleshooting Laptops, Tablets, and Mobile Devices 10-22-2020, 10:29 AM
Replies: 22
Views: 1,639
Posted By DanFen
Re: Troubleshooting a Asus X541UVK

Never did it before, so could do with some hints.

Power button is part of the keyboard.
Forum: Troubleshooting Laptops, Tablets, and Mobile Devices 10-21-2020, 11:04 AM
Replies: 22
Views: 1,639
Posted By DanFen
Re: Troubleshooting a Asus X541UVK

0V on the coils

and SIO pin 85 is 0.8V too.
Forum: Troubleshooting Laptops, Tablets, and Mobile Devices 10-21-2020, 07:30 AM
Replies: 22
Views: 1,639
Posted By DanFen
Re: Troubleshooting a Asus X541UVK

Hey :)

PQ8902 pin4 = 24V
PQ8902 pin3 = 19V

PR8938 = 19V

PU8701 pin1 = 0V
PU8701 pin2 = 0V
PU8701 pin3 = 3V
Forum: Troubleshooting Laptops, Tablets, and Mobile Devices 10-20-2020, 11:54 AM
Replies: 22
Views: 1,639
Posted By DanFen
Troubleshooting a Asus X541UVK

Hello everyone. Hope you're all doing great in this crazy world :)

I am an IT person, but not much of an electronics guy (actually not at all), so I need your help with finding the cause that's...
Showing results 1 to 25 of 148

 
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