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Search: Posts Made By: Agent24
Forum: General Electronics Technical Discussion 02-12-2019, 02:26 PM
Replies: 12
Views: 142
Posted By Agent24
Re: Replacing faulty RAM on video cards?

If I understand right, DRAM is an array of MOSFETs where the "capacitor" is the gate charge. I suppose it makes sense they all might be damaged if the VRM had badcaps, for example.

The RAM is...
Forum: General Electronics Technical Discussion 02-11-2019, 01:53 PM
Replies: 12
Views: 142
Posted By Agent24
Re: Replacing faulty RAM on video cards?

Thanks, I didn't know that - I can see it would be even trickier than I first thought... unless something like freezer spray has any obvious effects.

I'll still try that first, and if it's...
Forum: Troubleshooting Power Supplies and Power Supply Design 02-11-2019, 02:36 AM
Replies: 5
Views: 96
Posted By Agent24
X-Force 200 "Power Supply"

https://youtu.be/0OSA1CS8bV4

http://www.xforceamps.com/item/Adjustable-Regulated-Power-Supply-448

As Morpheus said: "You have to see it for yourself"
Forum: General Electronics Technical Discussion 02-10-2019, 06:36 PM
Replies: 12
Views: 142
Posted By Agent24
Re: Replacing faulty RAM on video cards?

Good point - and even if you find which address(es) are bad, which physical IC does that correspond to anyway... no schematics for these things.

Perhaps freezer spray and hot air could narrow it...
Forum: General Electronics Technical Discussion 02-10-2019, 04:18 PM
Replies: 12
Views: 142
Posted By Agent24
Replacing faulty RAM on video cards?

I have an old Radeon X300 which has what is considered a classic sign of bad VRAM; lines down the screen.

I'm thinking of replacing its RAM chips, but wonder if this is actually likely to fix it?...
Forum: General Computer Discussion 01-15-2019, 01:57 PM
Replies: 122
Views: 15,420
Posted By Agent24
Re: The hard drive failure thread

Well, you typically aren't going to need that HDD full of, say, Linux ISOs that you haven't used since 2002...
Forum: Custom Tweaks, Modifications, and Revisions 01-09-2019, 06:53 PM
Replies: 518
Views: 131,413
Posted By Agent24
Re: The ghetto mod thread

I think it might be a MUCU5 chip.
Forum: Troubleshooting Computer Displays 01-09-2019, 05:25 PM
Replies: 91
Views: 125,746
Posted By Agent24
Re: Inverter tester using old CFL

Perhaps if you trace out how the output windings of the transformers are connected it will give you some clues?
Forum: Custom Tweaks, Modifications, and Revisions 12-26-2018, 02:16 PM
Replies: 518
Views: 131,413
Posted By Agent24
Re: The ghetto mod thread

Winbond = probably SIO chip. Guess it wasn't generating some required system control signal.
Forum: Custom Tweaks, Modifications, and Revisions 12-24-2018, 04:00 PM
Replies: 518
Views: 131,413
Posted By Agent24
Re: The ghetto mod thread

Looks like a spaghetti monster is lurking in there :tongue:

I want to see how ghetto the eye pattern from the laser pickup is with all that!
Forum: Custom Tweaks, Modifications, and Revisions 12-22-2018, 06:18 PM
Replies: 518
Views: 131,413
Posted By Agent24
Re: The ghetto mod thread

It was not a complicated design, but I needed to connect a connector with many pins... on the edge of the board... and having the PTHs would short everything.

Is there a grid between the (tiny)...
Forum: Equipment Usage, Soldering, Techniques, and Reviews 12-22-2018, 04:45 PM
Replies: 5
Views: 228
Posted By Agent24
Forum: Custom Tweaks, Modifications, and Revisions 12-22-2018, 03:04 PM
Replies: 518
Views: 131,413
Posted By Agent24
Re: The ghetto mod thread

Speaking of that, does anyone on eBay sell double-sided protoboard without PTH? I wanted some a while ago where I would have had to drill out the plating from about 80 holes...
Forum: Equipment Usage, Soldering, Techniques, and Reviews 12-22-2018, 01:18 AM
Replies: 5
Views: 228
Posted By Agent24
Re: Analogue T12 style controller - anyone tried it?

Well, perhaps that is how it is supposed to work.

But in https://www.eevblog.com/forum/projects/measuring-temperature-from-a-t12-soldering-tip/ someone says he bought one and it did not function...
Forum: Equipment Usage, Soldering, Techniques, and Reviews 12-22-2018, 12:11 AM
Replies: 5
Views: 228
Posted By Agent24
Re: Analogue T12 style controller - anyone tried it?

From what I understand, it should basically work - unless I have interpreted it incorrectly.

U1B will drive Q2/Q1 on while C2 charges via R4, until C2's charge reaches about 1/2 Vcc, then U1B...
Forum: Equipment Usage, Soldering, Techniques, and Reviews 12-21-2018, 07:37 PM
Replies: 5
Views: 228
Posted By Agent24
Analogue T12 style controller - anyone tried it?

I see the "T12" stations are quite popular now, and what I found fascinating was this thread here: https://www.eevblog.com/forum/reviews/interesting-936-to-t12-(fx951-integrated-tip)-conversion/ -...
Forum: General Electronics Technical Discussion 12-21-2018, 01:17 AM
Replies: 21
Views: 394
Posted By Agent24
Re: What is the easiest circuit board software to use

It's the best for me because it does everything I need/want, does it well, and does it for nothing.

I've tried Eagle and hated its lack of online DRC & boardsize\layer limits (for the free...
Forum: Custom Tweaks, Modifications, and Revisions 12-20-2018, 09:46 PM
Replies: 518
Views: 131,413
Posted By Agent24
Re: The ghetto mod thread

Not until that dust catches fire, anyway! :tongue:
Forum: General Electronics Technical Discussion 12-19-2018, 03:56 PM
Replies: 21
Views: 394
Posted By Agent24
Re: What is the easiest circuit board software to use

I use KiCad all the time, it's my favourite. Highly recommend you at least give it try. It's the best featured free package I've tried.
Forum: Troubleshooting Power Supplies and Power Supply Design 10-02-2018, 08:36 PM
Replies: 3,000
Views: 725,578
Posted By Agent24
Re: Power supply build quality pictorial. part 2

Why put so much effort in, just to use Fuhjyyu and Teapo? Sad.
Forum: Troubleshooting Power Supplies and Power Supply Design 09-16-2018, 03:54 PM
Replies: 1,554
Views: 306,325
Posted By Agent24
Re: the gutless, bloated, and fried power supply hall of shame

And you can guess which 'shop' it was by the firetrucks parked out front...
Forum: Custom Tweaks, Modifications, and Revisions 09-15-2018, 02:04 AM
Replies: 518
Views: 131,413
Posted By Agent24
Re: The ghetto mod thread

I haven't seen any that fancy.

Mine would possibly drip if I used it sufficiently, but I don't do much with it.

I did have an awfully cheap ($1) one before, which fell apart. I pulled the...
Forum: General Capacitor Questions & Issues 09-01-2018, 02:28 PM
Replies: 39
Views: 2,301
Posted By Agent24
Re: Swapping japanese/generic electrolythics with solid-states

Nobody ever found a datasheet for FL. It was likely only given to motherboard OEMs. I believe they would be ultra low ESR given their typical usage.

Your tester I think is accurate enough if...
Forum: General Capacitor Questions & Issues 08-31-2018, 05:50 PM
Replies: 39
Views: 2,301
Posted By Agent24
Re: Swapping japanese/generic electrolythics with solid-states

Well, the datasheet for MBZ says a 1500uF 6.3v part in 10x12.5mm size should have an ESR of no more than 0.026 Ohm @ 20C/100kHz.

Now, if your ESR test is at the same frequency and temperature,...
Forum: Troubleshooting TVs and Video Sources 08-23-2018, 12:34 AM
Replies: 82
Views: 16,523
Posted By Agent24
Re: Sceptre X505BV-FMDR

Suffix is often for the package type or denotes lead-free versions etc, but could be anything else as well, like voltage range or temperature. Without a datasheet it's hard to say.

I think some of...
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