PedroGG90
بدر الدين
Last Activity: 07-31-2024, 11:25 AM
Joined: 02-17-2023
Location: Casablanca
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Hi again , i found two optocouplers , one of them seems to be the feedback one , it gets activated from 2 zener diodes coming from output rail capacitor
The other optocoupler gets activated from small control board but dont know where it goes after it....Leave a comment:
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I need to search more....Leave a comment:
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After visual inspection , I can't see any optocoupler or tl431 . Or any feedback loop.
Only 2 optocouplers are driving signal from control board....Leave a comment:
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I need to open this thing to tell you , ill be back !...Leave a comment:
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This power supply is a hell to disassemble.
Ill try my best....Leave a comment:
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I will check and let you know ....Leave a comment:
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How to bypass hp pavilion laptop booting only if battery is inside ?
Hi everybody .
I have a hp pavilion dv 9500 ef laptop that i think is designed to boot only if battery is inside , and my battery is dead .
Any way to bypass it and make it work from power brick only without the need of a battery ?... -
Ok i have replaced primary and secondary capacitors with fresh ones , and the red light of overload has gone and i only see green light .
But i still hear that transformer squealing and still got 33 vdc not 24 volts ,
Any ideas ?...Leave a comment:
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Hi , I checked all the caps , they are good and high quality " rubycon" its less likely that they are faulty.
I still havent checked optocouplers from feedback loop.
But i still posit on the idea that the pwm signal is not correct or not sensed very well eather from logic side or analogue side....Leave a comment:
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Ill let you know next week...Leave a comment:
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Hi , i checked the primary capacitor and it gives low Dissipation factor and good capacitance.
I also checked the secondary capacitors, and its all good , also all semiconductors are good. So power side is not faulty i think.
I still suspect bad PWM signal , i mean the output is there "33 volts dc " but it should be 24 volts dc. maybe the modulation is bad or the output sense regulator inside the microcontroller is faulty .
Note : One thing i am sure of is that all controls are inside a small pcb containing 2 optocouplers and a microcontroller....Leave a comment:
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Can an lcr meter do the job ?
it can measure dissipation factor "D" of capacitor ....Leave a comment:
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Do you think it's maybe capacitor ?
I will to check them in my bench ....Leave a comment:
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Specs : [B]Siemens 6EP1437-3BA00 SITOP Modular DIN Rail Power Supply 24VDC 40A 960W 3-Phase[/B]
This power supply mosfets gets pwm signal from a microcontroller not generic IC.
So maybe that microcontroller is faulty ?
here is a video describing how the power supply behaves .Specs : [B]Siemens 6EP1437-3BA00 SITOP Modular DIN Rail Power Supply 24VDC 40A 960W 3-Phase[/B]
This power supply mosfets gets pwm signal from a microcontroller not generic IC.
So maybe that microcontroller is faulty ?
...Leave a comment:
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siemens sitop 24 vdc Smps outputs higher voltage 33 vdc
Hi everybody.
I have two 3 phase 400 vac smps siemens sitop 24 vdc giving red light overload and higher output 33 vdc.
The switching is controlled from micro controller.
Is it micro controller or transformer ? Or else pls ,?...Last edited by PedroGG90; 02-09-2024, 06:14 AM. -
Re: PS4 ce-35888-2
If it's firmware was flashed before. It may cause that .
I mean the flash that let's you play hacked games without disc inserted.Leave a comment:
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Re: Anyone here tried the ps2 slim resurrector ide hack ?
Yep, am lucky I got this silver 7000x...Leave a comment:
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Re: Anyone here tried the ps2 slim resurrector ide hack ?
Good for u , fats are the easiest but rare nowadays .
Even the slim I got is beat up and has no dvd drive or screws.
Time to resurrect some dead bodies....Leave a comment:
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Re: Anyone here tried the ps2 slim resurrector ide hack ?
The moment of truth.
It feels great to play ps2 the right way after all these years....Leave a comment:
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