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Search: Posts Made By: kaboom
Forum: Troubleshooting & Designing Networks 08-16-2022, 04:29 PM
Replies: 28
Views: 597
Posted By kaboom
Re: Netgear = By far the most horrible support ever!

Delta is/was always OK, at least when not "strongarmed" into cheap caps. Dell-OLOL!
Forum: Troubleshooting & Designing Networks 08-04-2022, 12:17 PM
Replies: 28
Views: 597
Posted By kaboom
Re: Netgear = By far the most horrible support ever!

Back in the mid-2000s, I always thought NG was a bit too "tryhard," especially since (old-school) Linksys was in its prime.

But now, TPL is probably my first (only?) choice. Especially since I've...
Forum: Troubleshooting & Designing Networks 08-04-2022, 01:20 AM
Replies: 28
Views: 597
Posted By kaboom
Re: Netgear = By far the most horrible support ever!

"I'm losin' my balls over heeeere, and this fuckin' moron's playin' Hazel!?"
"So leave the fuckin' cheese... WHERE IT IS!!!"
"Havva good time."
:poof:
Forum: General Capacitor Questions & Issues 07-30-2022, 12:13 AM
Replies: 13
Views: 465
Posted By kaboom
Re: Nichicon - discontinuing many electrolytic capacitor series

This is unbelievable. I never thought I'd live to see this.
As if the last few years haven't been stupid enough...
:angry:
Forum: General Computer & Tech Discussion 07-22-2022, 02:02 PM
Replies: 4
Views: 242
Posted By kaboom
Re: Psu pc Hp sff

I've worked on two of those HP SFFs, 6300's IIRC. One had a junk "replacepower" replacement, whose original caps failed after 6 months or so.
The second had its original PS, but with tired/bulging...
Forum: Troubleshooting Power Supplies and Power Supply Design 06-20-2022, 04:17 PM
Replies: 30
Views: 1,112
Posted By kaboom
Re: Learning with ATX CHIEFTEC 450W PSU

If it hasn't been mentioned already, make sure you're using the correct common point!
If you're shunting that pin of the APFC IC, it will go to the - side of the line rectifier!
Not secondary DC...
Forum: Troubleshooting Power Supplies and Power Supply Design 06-17-2022, 10:46 PM
Replies: 30
Views: 1,112
Posted By kaboom
Re: Learning with ATX CHIEFTEC 450W PSU

You're choking the APFC with the bulb in series with the AC line. For initial testing with the standby supply, you can use the dim-bulb, but the APFC will try to boost & charge the main B+ cap when...
Forum: Troubleshooting Desktop Motherboards, Graphics Cards, and PC Peripherals 05-01-2022, 06:27 PM
Replies: 7
Views: 371
Posted By kaboom
Re: After a thunderstorm, the Palit GeForce GT-240 video card

Was this a PC connected to a TV/monitor with external cable/antenna connections?

If so, what likely happened is the cable/antenna shield picked up an induced voltage from a nearby hit.
This then...
Forum: Troubleshooting Power Supplies and Power Supply Design 04-29-2022, 04:36 PM
Replies: 10
Views: 499
Posted By kaboom
Re: Busted tankless electric water heater control board

The heat from desoldering them can temporarily make the electrolytics test "better," leading to false positives.
If you're at that point, just change them.
Don't buy into the ESR testing- given...
Forum: Troubleshooting Power Supplies and Power Supply Design 04-27-2022, 09:11 PM
Replies: 10
Views: 499
Posted By kaboom
Re: Busted tankless electric water heater control board

Replace the electrolytics with the same voltage/value, but Nichicon PW/HE, or Panasonic FC/FR. I see at least 3 on that board.
Some look like 'noname' junk.
No wonder these "regularly" fail, with...
Forum: General Computer & Tech Discussion 04-14-2022, 08:06 AM
Replies: 21
Views: 1,746
Posted By kaboom
Re: Can a new computer smell like urine?

Actually, I use MAF sensor cleaner on PCBs, if/when I don't want to "waste" my CRC QD.

Are we certain this is a *new* motherboard?
:D

Not that I do it much anymore since the bottom's fallen...
Forum: Troubleshooting Audio Equipment 04-11-2022, 01:50 PM
Replies: 2
Views: 511
Posted By kaboom
Re: Bose Sound Link Mini II red power light is flashing

Pull the battery and check for shorts across the battery input on the PCB. The MLCCs can short. Remove each one and test if a short is found. Usually the boost converter is OK.

Seen this in JBL...
Forum: General Capacitor Questions & Issues 04-01-2022, 12:32 PM
Replies: 10
Views: 1,056
Posted By kaboom
Re: new apple studio display uses capxon caps

Yup, price =/= quality.

Just like "high end" audiophoolery, with sloppy wiring & cheep components, crApple is all about perception.
Forum: Troubleshooting Power Supplies and Power Supply Design 03-30-2022, 03:02 PM
Replies: 4
Views: 353
Posted By kaboom
Re: KingWin ABT-650MM 650 Watt ATX PSU [PCB: SW8835REV:A]

Nice job, as usual.
:rejoice:

If you're up for it, maybe reduce the timing cap for the '7500. Increase the freq & run the output inductor cooler; stay below ~50 kHz with that -26 core.

Yea,...
Forum: Troubleshooting Power Supplies and Power Supply Design 03-30-2022, 02:42 PM
Replies: 7
Views: 680
Posted By kaboom
Re: Delta DPS400-MB, pwr_ok stays low

Excellent, another one saved/fixed!
:nod:

IIRC, there were some AT-era Compaqs that had the PG circuitry on the MB.
I found this out when building a "retro PC" with a PS from one of these,...
Forum: Troubleshooting Power Supplies and Power Supply Design 03-28-2022, 04:55 PM
Replies: 7
Views: 680
Posted By kaboom
Re: Delta DPS400-MB, pwr_ok stays low

There should be a "pullup" resistor from +5 to PGO, as the latter is typically an "open collector" output.
If this is open, PG will never go high, no matter what's going on with the...
Forum: Troubleshooting Power Supplies and Power Supply Design 03-11-2022, 09:59 PM
Replies: 8
Views: 758
Posted By kaboom
Re: Laptop power brick audibly noisy

It's one of the cheaper "laptop replacement" power supplies.
Almost the same board as one I scrounged for parts, bigger transformer, same heatsinks- just wider, and the same lack of input...
Forum: Troubleshooting Audio Equipment 03-10-2022, 09:37 PM
Replies: 23
Views: 1,961
Posted By kaboom
Re: Roister Pb-150 Subwoofer repaired, how to prevent from failing again?

They seem to be better than average. That driver isn't shielded, there's no "can" around the magnet.



Probably just the probe scratching thru the anodizing.


You're welcome...
:spin:
Forum: Troubleshooting Audio Equipment 03-05-2022, 08:14 PM
Replies: 5
Views: 555
Posted By kaboom
Re: Philips F9217L-50R speakers build quality impressions and DIY surround repair

@momaka:

It's interesting how certain "unassuming" cabinet/driver combos can be improved. Even a (not so?) random port addition did wonders.

A QnD test for the port is to play some "party music...
Forum: Troubleshooting Power Supplies and Power Supply Design 03-03-2022, 10:53 PM
Replies: 12
Views: 626
Posted By kaboom
Re: 9v super basic wall wart issue

Soldering heat from R&R'ing C3 may have temporarily "woken" it up.
The 431 seems to need a minimum load; when an unbypassed opto LED is the sole source of current to the 431, the latter can hunt....
Forum: Troubleshooting Power Supplies and Power Supply Design 03-03-2022, 09:04 PM
Replies: 12
Views: 626
Posted By kaboom
Re: 9v super basic wall wart issue

The 431 may be hunting.

Try a 150-1k resistor across the IR LED in the opto.
Points are marked in attached image.

Change the small cap on pri side to 22u/50v or 47u/50v.
Forum: Troubleshooting Audio Equipment 03-03-2022, 12:53 AM
Replies: 23
Views: 1,961
Posted By kaboom
Re: Roister Pb-150 Subwoofer repaired, how to prevent from failing again?

OK, my turn.

Upgrade the drivers, Q47/48. Final gain drops at high output current; driver not only needs to be robust, but also keep its gain up so the previous stages stay linear.
The...
Forum: Troubleshooting Power Supplies and Power Supply Design 02-24-2022, 04:15 PM
Replies: 14
Views: 1,053
Posted By kaboom
Re: PSU weaken - occasional reset

Just so you're not chasing a false lead- remember that after desoldering, if those caps are warm when you ESR test them, you can get a false OK reading.
Let them cool 30 min or so before testing...
Forum: Troubleshooting Power Supplies and Power Supply Design 02-21-2022, 09:41 PM
Replies: 14
Views: 1,053
Posted By kaboom
Re: PSU weaken - occasional reset

Most likely, yes. Raidmax is known to use bad caps.

If PG is dropping out only with the tester connected, either the main output filters are nearly open, or bad small caps in the control ckts are...
Forum: Troubleshooting Audio Equipment 02-16-2022, 10:06 PM
Replies: 16
Views: 970
Posted By kaboom
Re: My grandma's Vintage Speakers Winson SB 300 A (1979)

Sears, now there's something that's fallen...

JVC Kaboomboxes & Gigatubers- early 2000's in their own way!
To think those are "old" or semi retro now...
Futuristic cyberpunk indeed. There was...
Showing results 1 to 25 of 500

 
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