No output. Repair of a welding machine

Repair of an extremely low cost inverter. No output voltage.

[@repairlab14]

If you enjoyed this video please like and leave your comments! Share this video with your friends! Thank you!

[@user-uc4jd7yo9q]

Здравствуйте. Этот канал для англоязычных)

[@khizarali89]

Very nice video

[@shannosilva8134]

Buenas tardes “ Señores muy buenos sus videos; solo le falta es grabarlos con audio ; ya q es fundamental el audio para interpretar mejor el video; muchas gracias

[@ajithp2714]

Superb work bro. Please upload more videos on welding machine repiring.

[@ttkoh123]

Regarding the 4 places, I think it is for either 2 IGBT or using 4 mosfets selection choices.

[@flacoanemico5199]

I have looked at data sheets and diqgrams and no info on correct voltage at shutdown/soft start pin. Thanks for sharing the info. 👍

[@repairlab14]

Vref 5V

[@abdellahzaidi1257]

عمل جيد. شكرا على الفيديو.

[@bernardobustos1554]

excelente video... tengo un problema parecido en el pin 8 tengo 7.8v y no arranca el integrado... ya cambie los dos trasistores y revise todas las resistencias... no puedo encontrar el programa

[@repairlab14]

On pin-8 must be 5 volts, same as vref. Replace 3525.

[@bernardobustos1554]

@@repairlab14 ya lo cambie pero persiste el problema....... gracias por responder

[@alexanderdevia417]

Gracias, no tenìa voltaje de referencia del pin 8 del SG3525, para futuras reparaciones

[@user-ld7qj7ho7z]

How many voltage out this plant

[@ghosttowncrawler3613]

Nice!

[@manjunath7775]

Hello bro,i changed all 8050 ,zener,6.2k ,22k resistor but i am getting 0.8v at 8pin of 3525 what could be yhe Resason,should I remove IC because that only left to change now

[@UlisesElMagnanimo]

I have the same welder and I have 67 volts at the output but it has no current. The output diodes and triacs are fine, the sg3525 works correctly. I don't know where to look anymore

[@repairlab14]

Maybe operational amplifier LM358

[@madank.r1346]

BRO Q1,Q2,Q3,Q4 TRANSISTER VALUE?

[@albertogasca2515]

thanks

[@MohammedLamini-ob9go]

i love that

[@jennybrown5726]

Boss what is problem for inverter welding machine 200a,250a,300a, after I change the four igbt, and I check the output voltage is 90vdc, when I test the sparking, immediately the igbt will explode back, sir what is the cause sir?

[@AutodidactEngineer]

I recently got a Kzubr 400N MMA single phase stick welder which claims to (input 220v-36.6A stable, up to 47.6A max input)output 400A lol. Anyway it seems to be built solid and after further inspection I found that the real output is actually 200A which is still awesome considering I paid 120€ for it. Anyhow I have taken it apart and examined it and the insides look pretty identical but instead of the ground and stinger bars that are made of aluminium in the one shown in the video mine has them made of copper which was nice to see. Anyhow what do you think the life expectancy will be of my machine?

[@repairlab14]

Depends on your luck. )))

[@akamasseganhoutode9694]

Bonjour

[@daliborjukic7039]

Hello I have the same problem on my mma 250 igbt welder. Pin 8 was reading low and I've removed j3y smd transistor and now it works. Should I wait for replacement transistor arrives or can I work with welder? Thank you

[@repairlab14]

Yes, you can

[@pv.chalapathirao4581]

ThankyouSir🙏🇮🇳

[@mohamadraja5549]

सर आवाज केसाथ वीडीयो बनाईये लीखने का तरीका भी चालु रखे आप जेसे लोग दुनीया मे कम मीलते है जो दुसरो को काम आते हैं

[@repairlab14]

Thank you. I am in the process of learning the language, in the future the videos will be with voice.

[@lucasrocha4329]

I have a welder machine which there is not output voltage. I tested 2 IGBT = Ok, 4 Diodes = Ok, 3 Polyester caps ok, 2 with 4.7 uF and 0.02 Esr and other 400v with 4.7uF and 0.03 Esr. Bridge rectifier is Ok. But, i haven't square waves in gate of 2 igbts. Thre wave it's similar to a part of senoid. Is the module the problem ?

[@repairlab14]

Sometimes the IC on the control board fails on its own.

[@lucasrocha4329]

@@repairlab14 The fan try to rotate . However, it moves too much small and i don't have 24v in this line.

[@repairlab14]

@@lucasrocha4329 A short circuit on the 24V line and the power supply does not start due to overload, or the IC is powered off from the secondary circuit

[@wallization]

Hi RepairLab14, do you have the diagram for this welder? thanks in advance

[@imagination2141]

I have mesin welding .no out put how to refair

[@patelrajeshbhai9909]

Good

[@smoke_stackz3168]

I got the problem it sparks but too weak

[@balaramvishwakarma3253]

Hii can you share 400amp welding machine control card circuit diagram ???

[@dharamveersharma573]

Ye transitor nihi ha yo kya karen

[@mohd.shahid4968]

Sir hindi main batayen please

[@smoke_stackz3168]

Sg3525 ur ic?

[@repairlab14]

Maybe operational amplifier LM358

[@zenamaghchouch2956]

What’s your address?

[@repairlab14]

61°15'07.9"N 73°20'41.1"E ;)