Wires Found Just Twisted And Joined In E-Cook Induction Cooker Model US-20TP
This induction cooker was brought by the same customer who had got a Star Induction Cooker repaired about a few weeks back. The complaint was that it got on, but not heating up, even though indication comes. One Beep sound repeats with no error indication on the panel. After opening and cleaning up the inside, when I checked the board, a few components were rusted. I replaced these.
Then did a thorough dry solder patch up. Noticed that the wires going to the panel were covered with tape at two places. There was indication of some previous service done by someone. When I removed the tapes, I was shocked to see that the wires were just joined together by hand twisting and no soldering was done. All the wires that went to the control section were in this condition. Only the AC supply wires for the lamp of LCD were intact. What an unscrupulous way of doing service!
I picked up a suitable relimate connector and soldered the other end to the removed pins from the old connector on the panel. As this was using a 13pin connector, I used a 10 pin and three pin connectors and inserted it in place on the Main Board.
Then, when I tried, the induction cooker did not beep but was not heating up. So, as per usual practice, I replaced all the 8050/8550 transistors, the 18V zener diode, 78L05 IC and electrolytic capacitors.
But even then, it did not heat up. So, as a last possible cause, replaced the Viper 12A IC. Then when I switched on, it worked very well heating up quickly. After testing it for domestic use, I fixed the covers and called the customer to come and pick it up.
Of-course, satisfaction of accomplishing another mission, was just waiting for green signal (which was provided by the panel itself (LOL) to jump into its collection bag!
Oh, I know what you are looking for! The snap of components replaced; here we are:
This article was prepared for you by Parasuraman Subramanian from India. He is 72 years old and has more than 30 years’ experience in handling antique equipment like Valve Radio, Amps, Reel Tape Recorders and currently studying latest tech-classes conducted by Kerala State Electronics Technicians’ Association. He has done graduation in BBA degree, private diploma in Radio Engineering and retired as MD of a USA company. Presently working as Consultant to Hospital and other institutions.
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You may check on his previous repair article below:
https://jestineyong.com/return-of-an-lg-led-tv-with-backlight-problems-after-four-months-of-working/
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Waleed Rishmawi
May 24, 2021 at 4:58 pm
Induction cooker expert... have a blessed day
Parasuraman S
May 25, 2021 at 12:49 pm
Many thanks for your comments!
Imoudu
May 25, 2021 at 11:14 pm
Some Chinese wires in appliances sometimes hard to solder together.I wonder when you charge your customer:before or after repair is done? Thanks.
Parasuraman S
May 26, 2021 at 9:16 pm
Many thanks for your comments! I rarely take any advance. Most of the payments are afterwards.
Albert van Bemmelen
May 24, 2021 at 6:07 pm
You mentioned replacing all those transistors and other parts without any effect after finding it was the defect Viper IC. But I suppose that still doesn't mean that all those replaced parts you showed in the photo were indeed defect?
Parasuraman S
May 25, 2021 at 12:53 pm
As a routine maintenance work, we do replace all the 8050/8550 and high watt resistors in Induction Cooker, whether they are checked and found to be ok. Because, technical experts advice and my experience also confirms that it is absolutely essential. Otherwise the IGBT will fail soon and the unit will come back. For example, in another article too, I have mentioned about replacement of 78L05, 18V Zener. It will pass all tests, but won't work on the board. Why is it, well, I have no answer for that! Many thanks for your comments!
Mike Retz
May 25, 2021 at 2:33 am
Hi . Like your articles and you sure get things fixed using your troubleshooting methods. Helping other people in this time of need is what is needed in all facts of life. The reward in the end is worth its wait in gold!!have a great day and keep on doing. Mike retz Dallas tx.
Parasuraman S
May 25, 2021 at 12:54 pm
Many, many thanks for your very encouraging comments! May God bless you, dear!
Yogesh Panchal
May 25, 2021 at 4:12 pm
Well Done! Sir
Parasuraman S
May 26, 2021 at 9:16 pm
Many thanks for your comments!