#301 

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Thank you so much 😀 i am just sharing my experience so that might be someone may take benefit. stay blessed

it is my pleasure. thanks for your valuable appreciation. yes i will try to share complete step by step testing in detail very soon

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Thank you so much Jazaak Allah kahir

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@@HaseebElectronics ❤

best regards and special thanks. because there is no circuit diagram or service manual available so i love to explain it in detail so that might be it will useful for someone in future

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best regards. for ac voltage stabilizer & regulators i will share videos in upcoming January as i have plan to visit Pakistan. there are much use of stabilizers & regulators here in Jordan there is very rare use of these items

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it was just introduction to the board, the detailed videos are coming soon. because i love to explain in detail

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thanks for appreciating my work. stay blessed and next parts are near to upload soon

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Aap se baat karne ki ichha hoti hai my brother.

yes it have to come very soon

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best regards and special thanks apply jumper check PFC voltage then check power resistor near Large capacitor then check the 12 volt section

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best regards dear brother

Wa alaikum salaam dear Many many thanks

thanks a lot dear

LM317 is a adjustable regulator and have a very limited current output so i never tried it in any battery charger circuit

Thanks and sure

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yes sir i will try my best i am sorry for very very late because some problems i couldn't record new videos from last many weeks as i was isolated due to covid. but now i am back again

@@HaseebElectronics okay I thank Allah for quick recovery and healthy life please take good care of yourself and always sanitize your hand and use nose mask.

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yes. to increase a converter efficiency (because when dc rail voltage decrease that time the PWM IC have to switch more and more by extending its duty cycle to the maximum limits, so that its efficiency will decrease) the PFC is used. it maintains the dc voltage at specific value, for example if we connect this PSU to 110 volt, that time the voltage at bulk capacitor will 140 VDC but when we will turn it ON, immediately the DC rail voltage will boost to 410 VDC. so that the main power supply will work perfectly without loosing its efficiency

@@HaseebElectronics I am guessing PWM is voltage monitored and PFC is current monitored ( I.E. what gets dumped on to the negative rail ? ) why so much complexity in the PFC circuitry when all that is required is comparators around the negative rail , I need to be patient for your following parts in the series.

@@keithcitizen4855 actually both work as SMPS working principle. Just PFC is identical to a buck converter or a boost converter. it is to maintain a specified voltage on the DC rail. i will explain it in very detail you can also check video number 221 on my channel, that is for PFC power supply in LED TV its main roll in any SMPS circuit is to stabilize DC rail voltage to ensure the output efficiency of the converter for example, in this PSU we need 12V16A that is a high amount of power (to drive a power supply at low input range of voltage. the converter efficiency will decrease from 90% to 70%. ) so the PFC circuit will boost the dc voltage to a 410 VDC level, disregarding the input voltage (110 VAC to 240 VAC that means 140 VDCto 340 VDC) in this way the our required power supply will regulated and using this design technique, it decreases the cost and improves the regulation

@@HaseebElectronics it didn't dawn on me but it makes sense a buck convertor would be required to raise voltage above the natural 330 DC thankyou , I will digest/ learn more from looking at your last comment recommended videos.

@@keithcitizen4855 I mean PFC working theory is similar to buck or boost converter best regards

kindly mention the model number of home theater

welcome dear. 1. in first stage you have to check voltage at main dc capacitor (BULK Capacitor). you should find dc voltage (ac input voltage x 1.414). if not present check fuse, bridge rectifier. check video number 304 2. then you have to check standby section 3. then it should operate PFC and then 12 volt section will work at end

@@HaseebElectronics the first step would be to measure the voltage on the capacitor from 100uF/450v (accuses 175v more or less) until everything is ok. I examined the standby stage which I believe is controlled by the integrated Dnp015 , on pins 1 and 2 (gnd and vdd) I get 10v. I have the ADP-240AR scheme which by the scheme would be 24v. The output is missing the 5vsb voltage on pin 4 of the CN121 connector

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coil whine problem becomes annoying. it occurs due to looseness or weak binding of core or coil former. it causes noise, excessive heat dissipation and lowers the efficiency and after a time it destroys the coil enameled coating its solution is insulating varnish, dip the coil in varnish and let it dry for 24 hours repeat one or two more coating process

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it is my pleasure