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Search: Posts Made By: b700029
Forum: General Electronics Technical Discussion 08-30-2012, 09:10 PM
Replies: 11
Views: 4,348
Posted By b700029
Re: Dummy load for testing laptop chargers

2 12V lamps in series, of the appropriate wattage.
Forum: Troubleshooting Laptops, Portable, and Mobile Devices 08-30-2012, 07:39 AM
Replies: 5
Views: 3,346
Posted By b700029
Re: Hp compaq cq60 keyboard and touchpad not working

Clean the connector on the mobo.
Forum: Troubleshooting Power Supplies and Power Supply Design 08-28-2012, 08:05 PM
Replies: 89
Views: 10,168
Posted By b700029
Re: Need help on this lenovon Power supply

There's no BIOS startup or HDD password as you've gotten as far as the Windows login.

There does appear to be a BIOS admin password though, but that can wait for later, unless it's not letting you...
Forum: Troubleshooting Power Supplies and Power Supply Design 08-28-2012, 08:00 PM
Replies: 17
Views: 3,013
Posted By b700029
Re: corsair hx620 hissing/rattling sound

Use a thin nonconductive tube as a stethoscope to see where that sound is coming from. It sounds like arcing or a faulty protection circuit that's attempting to shut it off in bursts.
Forum: Troubleshooting Laptops, Portable, and Mobile Devices 08-28-2012, 07:55 PM
Replies: 15
Views: 4,640
Posted By b700029
Re: Advice on reflowing HP DV6000?

A multimeter won't work. You might even damage it with the ohmmeter bias voltage, since these chips are not designed to take much more than ~1v. Either way it'll show as shorted across the power...
Forum: Troubleshooting Laptops, Portable, and Mobile Devices 08-28-2012, 07:52 PM
Replies: 44
Views: 15,445
Posted By b700029
Re: Toshiba Satellite L300 overheating ,bad heatsink?

I agree with this. You can alternately run hot and cold water through the fins, and the other end should change temperature almost instantly, much faster than regular thermal conduction through a...
Forum: Troubleshooting Game Consoles & Other Weird Devices 08-28-2012, 04:34 AM
Replies: 15
Views: 9,377
Posted By b700029
Re: Help identifying DS Lite trimmer potentiometers.

...so the place selling them doesn't even know their value? :wtf:
Forum: Troubleshooting Audio Equipment 08-26-2012, 07:17 PM
Replies: 13
Views: 2,755
Posted By b700029
Re: Burnt components in USB DAC + help in identifying

Remove U107 and measure the resistance between pin 7 and ground. There might be something shorted in the output that's causing it to heat up.
Forum: Troubleshooting Laptops, Portable, and Mobile Devices 08-26-2012, 07:05 PM
Replies: 9
Views: 7,867
Posted By b700029
Re: Dell Laptop Charger

Have you considered using DS2431 instead? Same capacity as a 2502, slightly different write characteristics (closer to regular EEPROM), about 66% cheaper.
Forum: Troubleshooting Power Supplies and Power Supply Design 08-26-2012, 06:47 PM
Replies: 24
Views: 6,707
Posted By b700029
Re: AT PSU mod - take two!

I guess that's the reason for the fan twitching when turning off from protection mode, but all the AT supplies I've seen have the output just die off otherwise when turning off normally.
Forum: Troubleshooting Power Supplies and Power Supply Design 08-26-2012, 06:42 PM
Replies: 3,048
Views: 776,029
Posted By b700029
Re: Power supply build quality pictorial. part 2

It's the current rating that matters, increasing the reverse blocking voltage won't change that. As Th3_uN1Qu3 said above, the voltage from the transformer output isn't anywhere near that.
...
Forum: Troubleshooting Power Supplies and Power Supply Design 08-24-2012, 03:40 AM
Replies: 5
Views: 2,656
Posted By b700029
Re: Seasonic SS-200SFD

The original was max 35ns, so those are a bit slower. Might work, or might not, depending on how they spec'd the original circuit.
Forum: Troubleshooting Power Supplies and Power Supply Design 08-23-2012, 10:52 PM
Replies: 5
Views: 2,656
Posted By b700029
Re: Seasonic SS-200SFD

Manufacturer: "Zowie Technology" :lol:

You need to replace it with an 800V 1A ultrafast diode (<= 35ns recovery time).
Forum: Troubleshooting Power Supplies and Power Supply Design 08-23-2012, 10:29 PM
Replies: 66
Views: 9,324
Posted By b700029
Re: Codegen 350XA supply

Has this supply ever powered the mobo successfully? The 4-pin connector is +12V for the CPU buck converter and draws a lot of power.
Forum: Troubleshooting Laptops, Portable, and Mobile Devices 08-23-2012, 10:21 PM
Replies: 955
Views: 435,862
Posted By b700029
Re: Toshiba Satellite - Locks up when plugged in

Or they were installed with too much heat/too long. Reading the datasheet suggests that they're quite sensitive to heat.
Forum: Troubleshooting Power Supplies and Power Supply Design 08-22-2012, 11:53 PM
Replies: 24
Views: 6,707
Posted By b700029
Re: AT PSU mod - take two!

Would you say that almost all AT supplies use the same design or are nearly identical? All the ones I've had the misfortune of shorting would buzz like that and twitch the fan until powered off...
Forum: Troubleshooting Power Supplies and Power Supply Design 08-22-2012, 11:39 PM
Replies: 66
Views: 9,324
Posted By b700029
Re: Codegen 350XA supply

The flats will vary in width to maintain a constant 12V average on the output filter caps, as the load varies.

If you're going to try measuring the primary, remember to float the DUT with the...
Forum: Troubleshooting Power Supplies and Power Supply Design 08-19-2012, 04:15 PM
Replies: 66
Views: 9,324
Posted By b700029
Re: Codegen 350XA supply

Escort Eagle, he's not going to get anything to work with the 12V rail at half its nominal voltage.

You mean diode on a bracket :D

...The possibly only advantage of building it this way is so...
Forum: Troubleshooting Power Supplies and Power Supply Design 08-16-2012, 10:25 PM
Replies: 38
Views: 8,542
Posted By b700029
Re: Chip of the year 2008

If anyone has the equipment to decap one of them we might be able to figure out who the manufacturer is.

I have a good guess it's Chipgoal (lol) CG8002...
Forum: Troubleshooting Laptops, Portable, and Mobile Devices 08-14-2012, 10:16 PM
Replies: 6
Views: 2,705
Posted By b700029
Re: Asus A6000 (A6K) - To reflow, or not to reflow...

Here is the boardview. Do you know Polish?
http://www.elvikom.pl/forum/viewtopic.php?p=157
Forum: Troubleshooting Laptops, Portable, and Mobile Devices 08-14-2012, 10:08 PM
Replies: 9
Views: 4,336
Posted By b700029
Forum: General Electronics Technical Discussion 08-14-2012, 10:07 PM
Replies: 26
Views: 4,084
Posted By b700029
Re: AC Adapter amperage

I'm not familiar with pipe cutters but sounds like it's similar to an electric drill, which is also very power-hungry as it uses a brushed DC motor. Stall currents can be over 100A....
Forum: General Computer & Tech Discussion 08-14-2012, 10:01 PM
Replies: 7
Views: 3,002
Posted By b700029
Re: Thinking of putting a subwoofer inside my dv9000

dv9000?

Just don't let the bass shake the BGAs too much...
Forum: General Computer & Tech Discussion 08-14-2012, 09:40 PM
Replies: 7
Views: 2,006
Posted By b700029
Re: Burning ISO Hell!

One of the oldest newcomer mistakes that still happens to the experienced, is to burn an ISO to a disc as a file so instead of the ISO being written directly as a disc image you put the disc in the...
Forum: Troubleshooting Laptops, Portable, and Mobile Devices 08-13-2012, 10:17 PM
Replies: 9
Views: 4,336
Posted By b700029
Re: Gateway MA2A power on issue pics included

You can see if a schematic (http://kythuatphancung.com/download/gateway-mx6128-mx6650-mx6635b-quanta-ma2a-laptop-shematic.html) can help with your troubleshooting.
Showing results 1 to 25 of 500

 
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