SA. There is 54V at the legs 5 and 7 of the pwm ic. You only changed the this ic so there should be still 54V there. This voltage is too high or not? I am not able to understand the situation
Peace be upon you. I have a power supply. The cooling fan used to work when the temperature rose and turn off when the temperature dropped, but now it works continuously without stopping. I looked for the temperature sensor, but I did not find it. There is no sensor. How do I fix the problem?
most of time, these is NTC thermistor (glass packing looking line zener diode) 0r 1N4148 dides becomes problematic sometimes it feeeds to TL494 to produce PWM signal for speed control sometimes the NTC is connected to linear condcuting transistor
Dear sir, assalamualikum. Hope fine. Sir i will larned so many things form your vedio . I have a power supply 12 v 5 amp. In this power supply they use BYQ30E /200 scoty daiod. But in my aria this is not available. So please tell me which one replace for that . Thank you very much. Have good day. Allah hafez.
Sir, I've a +12: 0 : -12 V smps taken out from an F&D 5.1 speaker system. The problem is, it is giving out only +5: 0 : -5 V at the output. When I checked, there was nothing blown or shorted or open circuit in both the output side and input side. But the power supply line to the IC is fluctuating from 8V to 15V. What could be the possible issue here?
You have to check the supply of the ic from the auxiliary winding of the power transformer Now the ic is supply only from startup circuit and the self sustain supply are dead.
Electrical characteristics section says VCC = 15V and Reference section of the datasheet says VCC = 12V to 25V So I don't really know, what's the VCC for this IC UC3842AN ?? JAZAKALLAHU KHAYR
Excellent mr haseeb 👌👍💟🙏
Many many thanks
Thank you so much. God bless you.
You are so welcome
Thank you for your sharing, it is awesome🥰🥰
You are so welcome!
Excellent. Thank you sir.
Nice sir👍
Good 👍
wa3alecomo alsalam wara7mato Allah w brakatoho
Sir make some dell monitor smps repair videos...
Love from India...🎉
i will try my best to arrange
@@HaseebElectronics sir how can i contact with you sir ?
👍👍👍
Aleykümselam ve Rahmetullahi ve berekatuhu.
Hi Hasbeeb. After your repair, how much voltage to ground you get at pin 5 and 8 when energized.
it must be 5 volt regulated
check detailed video for practical answer
th-cam.com/video/B2ZzIQTreNw/w-d-xo.html
💐😊
SA. There is 54V at the legs 5 and 7 of the pwm ic. You only changed the this ic so there should be still 54V there. This voltage is too high or not? I am not able to understand the situation
check detailed video for practical answer
th-cam.com/video/B2ZzIQTreNw/w-d-xo.html
@@HaseebElectronics it is good trick since we did not care the aux winding the video is very informative thanks
Salam. What do you think caused the failure of the IC?
wa alaikum salaam
check detailed video for practical answer
th-cam.com/video/B2ZzIQTreNw/w-d-xo.html
3:28 what is this solder remove tool
it is WELLER WR3M rework station
@@HaseebElectronics thanks
how do you verified vcc rectifier sir?
check detailed video for practical answer
th-cam.com/video/B2ZzIQTreNw/w-d-xo.html
Good morning sir camera is zoom out too much maybe is in wide possition and not Very pleasant 😰
Lens
Assalamualaikum
How many watts lamp is best to use in Series Connection, can we use LED Lamp or Classic lamp filament type only?❤
wa alaikum salaam
best option is 60 watt to 10 watt filament Tungsten lamp
we cannot use LED lamp for series testing
@@HaseebElectronics
60 to 100 watts
Thanks a lot.
✋👍
Peace be upon you. I have a power supply. The cooling fan used to work when the temperature rose and turn off when the temperature dropped, but now it works continuously without stopping. I looked for the temperature sensor, but I did not find it. There is no sensor. How do I fix the problem?
most of time, these is NTC thermistor (glass packing looking line zener diode) 0r 1N4148 dides
becomes problematic
sometimes it feeeds to TL494 to produce PWM signal for speed control
sometimes the NTC is connected to linear condcuting transistor
Dear sir, assalamualikum. Hope fine. Sir i will larned so many things form your vedio . I have a power supply 12 v 5 amp. In this power supply they use BYQ30E /200 scoty daiod. But in my aria this is not available. So please tell me which one replace for that . Thank you very much. Have good day. Allah hafez.
Sir, I've a +12: 0 : -12 V smps taken out from an F&D 5.1 speaker system. The problem is, it is giving out only +5: 0 : -5 V at the output. When I checked, there was nothing blown or shorted or open circuit in both the output side and input side. But the power supply line to the IC is fluctuating from 8V to 15V. What could be the possible issue here?
You have to check the supply of the ic from the auxiliary winding of the power transformer
Now the ic is supply only from startup circuit and the self sustain supply are dead.
The electronic components are working with smoke
When smoke come out, they no longer functioning.
Good one 😂
Ve aleyküm selam 👋
.
Electrical characteristics section says VCC = 15V and Reference section of the datasheet says VCC = 12V to 25V
So I don't really know, what's the VCC for this IC UC3842AN ??
JAZAKALLAHU KHAYR
check detailed video for practical answer
th-cam.com/video/B2ZzIQTreNw/w-d-xo.html
@@HaseebElectronics ok bro May Allah reward you