Re: AeroCool VP-550 : IC identification issue
Final test to be certain :
A PC powered with ATX and CPU connectors only (I didn't remove the PC power supply to put the repaired one) => ok, no magic smoke or magic smell, fan is spinning gently.
It is working fine under normal load (CPU, system fan, graphic card and its fan, etc...)
Thank you to the guys at HEGE supporting Badcaps [ HEGE ] [ HEGE DEX Chart ]
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Re: AeroCool VP-550 : IC identification issue
2nd test, fan connected, with light bulb + power supply tester :
power on (all voltages seemed to be good on power supply tester), fan on, then all went off...
3rd test, no light bulb, power supply tester : all voltages ok (see attachment)
4th test , no light bulb, with 1 HDD : ok, all seems working so far !
As this is my very first "serious" electronic repair, I'm very happy !
Thanks so much guys for all your help !...
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Re: AeroCool VP-550 : IC identification issue
So far, so good :
New components soldered : [LIST][*]fuse (6.3A)[*]thermistor (SCK-2R56, 2.5 ohms, 6A)[*]bridge rectifier (GBU810 instead of GBU606)[*]mosfet (MDP13N50)[*]diode (original DP8S60P was ok but replaced with a MUR1560)[*]capacitor (180uF, 450V, Nichicon). No additionary capacitor as advised by momaka...[*]PWM STR6069H[/LIST]
1st test with 80W light bulb in series looks ok, fuse doesn't blow ! (fan not connected yet)[LIST][*]Small flash then off[*]Stand by voltage (purple wire) : 5.22V[*]Green...Last edited by bendeg; 05-21-2023, 02:25 AM.
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Re: Test circuit for curiosity : 2 x NE555 (astable + PWM) + n-mosfet + var 10k + pc
Little update for those who might be interested.
Different tests :
1) Same config as original but n-mosfet changed : IRF520 (2V < Vgs < 4V), instead of a MDP13N50 (3V < Vgs < 5V)
=> works better.
2) Without second 555 and Ra = 10k-pot instead of 1k-fixed to modulate duty cycle) : output of 555 direct to base of IRF520.
Working.
3) Same config as point 2) but replacing n-mosfet IRF520 with 3 npn BC547 in parallel...
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Re: Test circuit for curiosity : 2 x NE555 (astable + PWM) + n-mosfet + var 10k + pc
@momaka,
Indeed, it's possible to modulate duty cycle with only one 555. I'll try that.
I'll try with BJTs once I've got a bigger transistor than a tiny BC547, max 100mA for collector current if I'm not mistaken (fan demands twice as much). Or use 2 of them in parallel, is that possible to do ?
But, as I can see on the net, those 3 pins fans aren't very well suited for PWM driving, better use 4 pins fans which are designed to be controlled with PWM......
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Re: Test circuit for curiosity : 2 x NE555 (astable + PWM) + n-mosfet + var 10k + pc
I tried your "easy solution and, indeed, it works.
GNDs of PS1 and PS2 are connected (I tried that as well before posting, without success...).
But now I can hear what I think is most probably the frequency of the PWM : the sound, which is not loud, definitely comes from the fan circuit.
The tone gets higher if I make it faster (10k-pot of 1st timer AND 10k-pot to modulate second timer).
Funny but a bit scary though, I don't like that much, looks like it...
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Test circuit for curiosity : 2 x NE555 (astable + PWM) + n-mosfet + var 10k + pc fan
Hi reader,
I'm trying to control a pc fan speed by giving PWM to the gate of a n-mosfet.
1) generation of a clock with a 555 timer (~ 1,5 kHz, as seen in the datasheet, fig.12) (Vcc = 6V).
Output to TRIG of second timer (pin 2) + red led
2) generation of a PWM with a second 555 timer (as seen in the datasheet, fig.18), CONT (pin 5) modulated by a variable 10k resistor (Vcc)
3) Using output of second timer to "pulse" n-mosfet gate (MDP13N50) + yellow led
4) pc fan (12V, 0.18A) in series in drain-source of...
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Re: AeroCool VP-550 : IC identification issue
Ok, you confirm, thanks !
Thank you for that information !
I've sent a message to the guy who created the "The Resistor FAQ" thread. I can't do better....
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Re: AeroCool VP-550 : IC identification issue
I think I finally found a good info here, at the end of the page, it tells about some exceptions to the rule :
[URL="https://eepower.com/resistor-guide/resistor-standards-and-codes/resistor-color-code/"]https://eepower.com/resistor-guide/resistor-standards-and-codes/resistor-color-code/[/URL]
So, in my case :
Bands 1 and 2 : BROWN - BLACK => 10
Band 3 : SILVER (multiplication factor) => 10 * 0.01 = 0.1 Ohms
Band 4 : GOLD (tolerance) => 5%
Band...
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Re: AeroCool VP-550 : IC identification issue
What is the power rate of that 5 bands resistor (1 stage, near the big capacitor) ?
I couldn't find a color code calculator that found the answer using 5 bands.
Looks like it's a 4 bands resistor with a fifth one...
According to its color, BROWN - BLACK - SILVER - GOLD - GREEN...
(correct me if I'm wrong, I'm color blind, I've got problems especially with the greens, I'm a "deuteranope" guy)
...it's a 4 bands resistor, and it should be a 0.1 Ohm 5% resistor, right ? (and indeed,...Last edited by bendeg; 04-26-2023, 02:13 AM.
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Re: AeroCool VP-550 : IC identification issue
Oh, that's a lot of information.
There's more to do now...I'll update this thread when I've got all the components.
Thank you very much !!!...
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Re: AeroCool VP-550 : IC identification issue
1)
Fortunately, STR-6069H hasn't been delivered yet. Thank you for the advice !
And indeed, as I can read in the datasheet, page 23, for pin 7 (I believe this is what you want to tell me...) :
"
(7) Thermal Considerations
Because the power MOSFET has a positive thermal
coefficient of R DS(ON) , consider it in thermal design.
Since the copper area under the IC and the D/ST [B]pin
trace act as a heatsink[/B], its traces should be as wide as
possible....Last edited by bendeg; 04-12-2023, 08:23 AM.
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Re: AeroCool VP-550 : IC identification issue
Indeed, I only tried google search...
Oh, ok, it'll be the A6069H or any A606x then (700V max), not the A6059H (650V max).
Thank you very much for that info !...
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Re: AeroCool VP-550 : IC identification issue
It's a slightly different configuration (there's a second capacitor near the heatsink and there's no what looks like a yellow capacitor close to pin 3 and 4)
But anyway, thank you so much !!!
I also plan to install a 8 pins socket so IC can be replaced easily if needed.
Keep you all updated once I've got all parts soldered.
Fingers crossed......
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Re: AeroCool VP-550 : IC identification issue
As I see in the datasheet A6059H has the same specs (it would probably be a good replacement IC)
But how the hell did you find that !?!?
Thank you so much !!!...
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Re: AeroCool VP-550 : IC identification issue
I've received the STR-A6059H (working at 100kHz), and ready to be soldered, but I think it may not be a good idea (I've ordered 6 others of the series, mainly those that works at 67kHz, but 2 others that works at 100kHz as well, a bit crazy but I must try...) :
Let's suppose the proper IC should work at 67kHz, it such a case it means it also expects modulation feedback that would not match if I put one that works at 100kHz, right ?
In a nutshell, in such a case, the "modulation...
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Re: AeroCool VP-550 : IC identification issue
Ok, thanks for the advice !...
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Re: AeroCool VP-550 : IC identification issue
What do you think of such fuse holder in a PC power supply ?
[LIST=1][*]Ok, no problem[*]No way ![*]At your own risks ![/LIST]
In fact, I don't really trust that kind of holder : inner springs might be loose over time...
- Re: AeroCool VP-550 : IC identification issue
What do you think of such fuse holder in a PC power supply ?
[LIST=1] - Ok, no problem
- No way !
- At your own risks ![/LIST]
In fact, I don't really trust that kind of holder : inner springs might be loose
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- Re: AeroCool VP-550 : IC identification issue
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Re: AeroCool VP-550 : IC identification issue
Oh ok, I thouht these 2 ICs were related. I know now they aren't.
So, if the STR-A6059H I ordered fits well (fingers crossed...) and replacing the thermistor, the bridge rectifier, the MOSFET and the unique filter capacitor (180uF, 400V, reads only 5.5uF with the multimeter), I should see +5V on PS-ON and +5V on STAND BY, right ?
(I should probably better try with a bulb in series first...)
There's indeed another IC on the other side of the PCB which controls PFC : CM6805BG (10 pins,...Last edited by bendeg; 04-04-2023, 08:26 AM.
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Re: AeroCool VP-550 : IC identification issue
Unfortunately, I didn't pay attention while opening the case, and the rest of the IC is lost...
As for the exact part number, I ordered a few STR-A6059H (the first of the series working at 100kHz), thinking maybe it was related to another IC on the other side of the PCB : a CM6805BG (10-PIN Green-Mode PFC/PWM Combo CONTROLLER), which also works at 100kHz.
There's certainly a way to determine, or at least narrow down the research, to find which one would fit knowing the other components connected to it...
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