Badcaps.net Forum
Go Back   Badcaps Forums > Search Forums
Register FAQ Calendar Search Today's Posts Mark Forums Read

Showing results 1 to 25 of 500
Search took 0.06 seconds.
Search: Posts Made By: Agent24
Forum: Troubleshooting Laptops, Portable, and Mobile Devices 07-16-2019, 11:36 PM
Replies: 12
Views: 116
Posted By Agent24
Re: Acer Aspire Z3-105 AIO PC - no display, no POST, no VCore, won't turn off.

Thanks!


Not sure what you mean (I assume you want schematics?), but you will get better help if you start your own thread about this.
Forum: Troubleshooting Laptops, Portable, and Mobile Devices 07-16-2019, 10:34 PM
Replies: 12
Views: 116
Posted By Agent24
Re: Acer Aspire Z3-105 AIO PC - no display, no POST, no VCore, won't turn off.

Fixed! Much easier to think when it's not 3am... :rolleyes:

I tried tracing the ISL62771 ENABLE line back to the SuperIO IT8732F and found it goes through two transistors, an N-Ch FET 2N7002 (Q88)...
Forum: Troubleshooting Laptops, Portable, and Mobile Devices 07-15-2019, 08:47 AM
Replies: 12
Views: 116
Posted By Agent24
Re: Acer Aspire Z3-105 AIO PC - no display, no POST, no VCore, won't turn off.

I already measured voltage at all large inductors, there's a 5v, a 3.3v, a 1.8v, a 1.5v, a 1.2v (actually from a linear AP1122 regulator), and a 1v rail. (see photo)

Every one is always present as...
Forum: Troubleshooting Laptops, Portable, and Mobile Devices 07-15-2019, 07:45 AM
Replies: 12
Views: 116
Posted By Agent24
Re: Acer Aspire Z3-105 AIO PC - no display, no POST, no VCore, won't turn off.

Does anyone have a datasheet or pin-out for the IT8732F? I can't find one. :(
Forum: Troubleshooting Laptops, Portable, and Mobile Devices 07-15-2019, 07:33 AM
Replies: 12
Views: 116
Posted By Agent24
Re: Acer Aspire Z3-105 AIO PC - no display, no POST, no VCore, won't turn off.

There is 19v at the drain of the high-side MOSFETs, as expected.

There is no voltage on either inductor in the Vcore VRM as there is no gate drive to the MOSFETs.

Presumably this is because the...
Forum: Troubleshooting Laptops, Portable, and Mobile Devices 07-15-2019, 06:15 AM
Replies: 12
Views: 116
Posted By Agent24
Re: Acer Aspire Z3-105 AIO PC - no display, no POST, no VCore, won't turn off.

Not on external display, from external source.
You can use it like a monitor/TV when the PC is powered off.

Here it is plugged into my PS3. Confusing, I know. There is no indication anywhere that...
Forum: Troubleshooting Laptops, Portable, and Mobile Devices 07-15-2019, 05:35 AM
Replies: 12
Views: 116
Posted By Agent24
Acer Aspire Z3-105 AIO PC - no display, no POST, no VCore, won't turn off.

A friend of mine brought me this PC to have a look at. It runs off a 19v adapter and the motherboard is very similar to a laptop board so I thought I'd post in here.


The system does not POST or...
Forum: Troubleshooting Laptops, Portable, and Mobile Devices 07-08-2019, 03:15 AM
Replies: 2
Views: 57
Posted By Agent24
Re: TWPno3 (EM_H8316_N14H_V1.0) Netbook power on, no image/backlight, shorted?

Yes, it's an Intel Atom (or maybe Celeron?) SoC. That's a shame. It would have been nice to play with and stick Linux on it perhaps, if it'd worked. Oh well. Out it goes for spare parts I guess....
Forum: Troubleshooting Laptops, Portable, and Mobile Devices 07-08-2019, 02:57 AM
Replies: 2
Views: 57
Posted By Agent24
TWPno3 (EM_H8316_N14H_V1.0) Netbook power on, no image/backlight, shorted?

Just had a go at trying to fix a "TWPno3" netbook/laptop. It seems to be based on something that's been rebranded many times.

Very similar to:...
Forum: Troubleshooting TVs and Video Sources 07-06-2019, 10:50 PM
Replies: 280
Views: 85,161
Posted By Agent24
Re: Samsung LE32R88BD/ BN44-00155A

If you warm the glue with hot air it can be peeled off fairly easily.
Forum: Troubleshooting Power Supplies and Power Supply Design 06-03-2019, 04:32 AM
Replies: 1,560
Views: 319,759
Posted By Agent24
Re: the gutless, bloated, and fried power supply hall of shame

They don't make them like that any more! (or do they?)
Forum: Troubleshooting Audio Equipment 05-25-2019, 01:11 PM
Replies: 34
Views: 422
Posted By Agent24
Re: Crown Amp DC300A - One channel distirted, other good.

Thanks, that is a lot better than before, but can you try at a higher resolution? 300 dpi? Some of the component values are still hard to read, unfortunately.
Forum: Equipment Usage, Soldering, Techniques, and Reviews 05-23-2019, 01:23 PM
Replies: 92
Views: 1,374
Posted By Agent24
Re: Does flux expire ?? Flux discussion.

I kinda think it should be though. We might think it's hilarious, and understand the risks, but some 10 year old could blow themselves up trying it. Not that a dumb adult couldn't either, I suppose,...
Forum: Troubleshooting Audio Equipment 05-23-2019, 06:16 AM
Replies: 34
Views: 422
Posted By Agent24
Re: Crown Amp DC300A - One channel distirted, other good.

First place I'd be checking is the output pin of that dual opamp, IC1.
Looks like pins 1 and 13 are the outputs. Not sure which channel is which. They seem labeled 1&2 not L&R.

Hard to read the...
Forum: Troubleshooting Computer Displays 05-23-2019, 05:21 AM
Replies: 62
Views: 847
Posted By Agent24
Re: Help with dead Commodore 1802

B+ looks like that 121v rail which should be on, if I read it right, C813. 100uF 150v looks like.
Forum: Major Manufacturers Boards 05-23-2019, 05:11 AM
Replies: 15
Views: 409
Posted By Agent24
Re: Help HP Z440 workstation

Yes, that's what I mean. Move the BIOS reset jumper. Make sure you move it back afterwards.

Can you get the BIOS from HP? Typically they don't go bad by themselves though...
Forum: Troubleshooting Computer Displays 05-22-2019, 11:33 PM
Replies: 62
Views: 847
Posted By Agent24
Re: Help with dead Commodore 1802

With something that old, don't forget about cracked solder joints.
Forum: Equipment Usage, Soldering, Techniques, and Reviews 05-22-2019, 11:20 PM
Replies: 92
Views: 1,374
Posted By Agent24
Re: Does flux expire ?? Flux discussion.

I think a detergent is used as part of the flux-cleaning process, in industry, too.
The hobbyist can just leave the board outside an ant's nest for a week. :tongue:

But yeah, some flux is a bit...
Forum: Troubleshooting Audio Equipment 05-22-2019, 11:13 PM
Replies: 34
Views: 422
Posted By Agent24
Re: Crown Amp DC300A - One channel distirted, other good.

Some probably can, I know mine doesn't.
Forum: Troubleshooting Audio Equipment 05-22-2019, 12:58 PM
Replies: 34
Views: 422
Posted By Agent24
Re: Crown Amp DC300A - One channel distirted, other good.

The frequency input in your DMM likely only works at TTL logic levels, e.g. 5v. Check the manual to be sure.

Probably wouldn't work anyway, even if the 1kHz tone gets distorted, it'll still be at...
Forum: Equipment Usage, Soldering, Techniques, and Reviews 05-22-2019, 04:56 AM
Replies: 92
Views: 1,374
Posted By Agent24
Re: Does flux expire ?? Flux discussion.

Yeah, it'll smell alright... when the fat starts rotting :barf:
Beeswax might be better, actually!
Forum: Equipment Usage, Soldering, Techniques, and Reviews 05-21-2019, 06:07 PM
Replies: 92
Views: 1,374
Posted By Agent24
Re: Does flux expire ?? Flux discussion.

You'd need a motor controller wouldn't you? The inductive load of the transformer would be bad for a simple Triac dimmer?
Forum: Troubleshooting Audio Equipment 05-21-2019, 04:23 PM
Replies: 34
Views: 422
Posted By Agent24
Re: Crown Amp DC300A - One channel distirted, other good.

Yeah, that would probably work great with an appropriate probe. Actually I think EA or SC magazine made a kit to do that with an interface box for various attenuation ranges etc.
Forum: Troubleshooting Audio Equipment 05-21-2019, 04:15 PM
Replies: 34
Views: 422
Posted By Agent24
Re: Crown Amp DC300A - One channel distirted, other good.

Without a scope you can use another amplifier (or build one from something like an LM386) as a signal tracer, then follow the signal through until you find where it becomes distorted.

This would...
Forum: Troubleshooting Power Supplies and Power Supply Design 05-21-2019, 04:17 AM
Replies: 13
Views: 271
Posted By Agent24
Re: Dell D550p Not Starting

Well if the two MOSFET are on that heatsink, maybe the third device is the diode? I can't see anywhere else it might go, then.

I'm guessing the PSU switching transistors are on the far right...
Showing results 1 to 25 of 500

 
Forum Jump


Badcaps.net Technical Forums 2003 - 2019
Powered by vBulletin ®
Copyright ©2000 - 2019, Jelsoft Enterprises Ltd.
All times are GMT -6. The time now is 04:41 AM.
Did you find this forum helpful?