Re: Service manuals available free
I offer laptop and a few other schematics for free. You can even use a program like httrack and leech the lot. [url]www.electronicsrevived.com[/url] click downloads and then service manual archiveRe: Service manuals available free<b...manual archiveRe: Service manuals available free
I offer laptop and a few other schematics for free. You can
riotpack
Member
Last Activity: 06-27-2017, 06:16 AM
Joined: 07-11-2008
Location: Toowoomba/Rockhampton
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Re: Hard Disk:Samsung SP1604N - Pcb: BF41-00076A
Have a look here - or do some research on Hard Drive TVS diodes
[url]http://forums.seagate.com/t5/Barracuda-XT-Barracuda-Barracuda/I-killed-my-ST31000333AS-or-at-least-its-controller-card/td-p/33577/page/2[/url]Re: Hard Disk:Samsung SP1604N - Pcb:...7/page/2[/url]Leave a comment:
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Re: Hard Disk:Samsung SP1604N - Pcb: BF41-00076A
i think it's a diode - I had the same thing happen when I plugged in the wrong power adapter into an external drive (swapped the +5 and +12 rails) I found one on an old 40GB drive which I soldered into place and my 1TB drive worked fine.Leave a comment:
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Re: Scope probe ground clip sparking on chassis
[url]http://www.questronix.com.au/info/info_tingles.htm[/url]
Read that.Re: Scope probe ground clip sparking.../> Read that.Re: Scope probe ground clip sparking on chassis
[url]http://www.questronix.com.au/info/info_tingles.htm[/url]
Read that.Leave a comment:
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Re: Why fuses blow last in cheap power supplies
Alot of switching controller ICs also have a soft start feature available (usually by an RC network on the shutdown pin) which acts like a NTC thermistor, but does nothing for the inrush due to the reservoir capacitor charging up, of course a thermistor is useless if you quickly cycle the power when hot! And the "silicon" blows first because it is the weakest link and fuses are slow!Last edited by riotpack; 09-30-2011, 08:07 AM.Leave a comment:
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Re: Cheap cash register with a dead transformer
I have seen liquids hide under ICs and remain conductive causing problems, sounds like noise getting into the logic(cpu) side of things and the high Z sections (like the Xtal) can easily be influenced by even high resistances. It doesn't have IC sockets does it? regardless it may be good to get some parts from
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Re: DIY Dell Car charger
You can do it if you have enough time and enough test gear and the brains to pull it together. Start with the controller IC, for instance [url]http://www.ti.com/lsds/ti/analog/powermanagement/power_portal.page[/url] has a easy to use page where you input the Vin and Vout and Iout and it suggests the tps40210 IC.
So you download the datasheet and if you haven't built a DC-DC switching boost converter before you should download DC-DC design guides as well as be competent in magnetics such as inductor characteristics (you can wind your own,...Last edited by riotpack; 09-30-2011, 07:34 AM.Leave a comment:
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Re: New-old stock capacitors
With the new price of most not being high, unless they were of an extreme voltage or had a high value of capacitance then I wouldn't bother. A reforming would be a good idea but buying them would be a bad idea unless as I said, they are of an expensive make up in Voltage/Capacitance.Leave a comment:
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Re: Cheap cash register with a dead transformer
Look at the V regulator on that heatsink and see what type it is 7805 etc. Look at the electrolytic capacitor voltage after the bridge rectifier and you should get a rough idea what the transformer voltage was. Say the Electros are 16V then you could assume the transformer would be 9VAC (9*1.414=12.726V DC) and not 12VAC as that would be greater than 16VDC. As for current, well the peak of course would be when that motor kicks in and from what I see and from the existing Xformer would be less than 1A peak.Leave a comment:
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Re: Fuse marking RV16F
Take a photoLeave a comment:
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Re: Electrostatics
I use aluminum tape on thin strips of styrofoam. The reason it protects from electrostatic discharge is all pins are now shorted so there can be no potential difference between any pins thus no overvoltage to destroy the IC.Leave a comment:
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Re: Proview loud humming/buzzing sound
Monitor the 5v rail and check for ripple.Leave a comment:
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Re: Blown Bridge rectifier identity needed pls
Congratulations, nice work
. Just for informational purposes, when you see a triangle with an exclamation point inside it on the schematic, it requires exact component replacement (no substitution allowed). This is to ensure the safety of the set.
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Re: toshiba 37HL95 "no start"
I am hoping this is not corrupted firmware (location: seine board) - But before spending any money you can at least do voltage testing and see if something is upsetting the boot sequence.It may be a protection kicking in when something like the inverter kicks in, but keep it simple and start at the beginning, standby voltages and power on/protect circuit. Does it keep looping the flashing LEDs over and over? Is there any squealing sound, any sound?Leave a comment:
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Re: toshiba 37HL95 "no start"
Also refer page 17 and check ALL the standby voltages are present AFTER any regulators etc. Find out what is missing.Leave a comment:
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Re: toshiba 37HL95 "no start"
Great so you have the manuals and the TV. Now you can use logic to troubleshoot the problem. Start with the mains coming in and main SMPS (You said the STB5v is ok) - Are the voltages ok before the main switching transistor, and what about the circuit that turns the main SMPS on and any protection that may have cut in. IF you want to make it safer you can solder a wire to the point you wish to check before applying any power and connect your meter and then apply power. Refer to page 18 of the manual, connector p813a, what voltages do you get...Last edited by riotpack; 02-06-2011, 01:37 AM.Leave a comment:
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Re: In no state of bliss (Bliss A-394 SFX)
What IC does this use? You can monitor the protection pins with an analogue meter.Leave a comment:
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Re: LiteOn PA-6601-1A (600w) blows its TOP
Don't forget to check the snubber and the xformer for shorted turns if you have the equipment.Leave a comment:
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Re: Keep the PSU fan spinning after you turn the computer off
Then why not just use this? - I know it's messy; I just quickly drew it up.
[URL=http://img37.*************/i/mpsu1.jpg/][/URL]Leave a comment:
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Re: Keep the PSU fan spinning after you turn the computer off
But its only on for a couple of minutes once the computer is turned off isn't it (the fan in this design) ? So that would result in the standby circuits (Estimated around 5 watts) going from hot to cold and back to warm when the fan finally turns off?
"R2 and C5 control the length of time the fan runs after you power down - with these values it runs between 2 and 2.5 minutes. I know there are probably better, more efficient ways to do this, but I used the parts I have on hand. I know that PSU fans...Leave a comment:
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