Transistor Failed In V-Guard Stabilizer
Device: V-Guard Stabilizer used for Refrigerators
Complaint reported: Dead
Observation: Complaint was due to some component failure.
Trouble shooting and rectification done: Cleaned the inside thoroughly. Checked the transistors one by one using Analogue Multimeter. Found one transistor shorted. Replaced it. Looked for any other failure of components. Did not find any. Did a thorough dry solder patch up.
Result: Connected a bulb as load and switched on, the Stabilizer worked after about three minutes (time delay) and the output was perfect! Mission accomplished and satisfaction added to the collection bag!
Here are some pictures:
This article was prepared for you by Parasuraman Subramanian from India. He is 70 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/damaged-charging-socket-replaced-in-portronics-puresound/
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Lynn Blakely
May 22, 2020 at 7:41 am
Good job as usual, made possible by use of, a thorough way to check all semiconductors. Nothing like to feeling of a job fixed.
Parasuraman S
May 22, 2020 at 5:26 pm
Many thanks!
Humberto
May 22, 2020 at 9:50 am
Well done, Parasuraman
Parasuraman S
May 22, 2020 at 5:26 pm
Many thanks!
Waleed Rishmawi
May 22, 2020 at 12:51 pm
Good job my friend. Have a blessed day
Parasuraman S
May 22, 2020 at 5:26 pm
Many thanks, my friend!
Albert van Bemmelen
May 22, 2020 at 1:09 pm
Nice article with good detailed photos. Knowing this device is used for a moisture damp refrigerator I wondered why they used a plain pertinax (paperpressed) pcb instead of the better epoxy boards. Because pertinax is known for collecting moisture more easily.
Parasuraman S
May 23, 2020 at 8:24 am
Many thanks for your expert comments! This is kept on top of the Refrigerator, which is normally warm and there is no moisture. The 'paper pressed - pertinax' is news to me! Special thanks for that alone!
Paris Azis
May 22, 2020 at 2:48 pm
Hi Parasuraman. "...using analogue multimeter"...This adds more value to a successful repair! Good old school...
My greetings!
Henrique J. G. Ulbrich
May 23, 2020 at 12:30 am
Correct, Paris. I belong to the "old school" and appreciate very much working with the analog multitester. it gives me operational confidence.
Parasuraman S
May 24, 2020 at 8:59 am
Very true!
Parasuraman S
May 23, 2020 at 8:25 am
Yes, using Analogue multimer for checking transistors and diodes is as recommended by our great Jestine Yong in his book! This is a very valuable tool for any electronic technician!
Yogesh Panchal
May 22, 2020 at 6:37 pm
Good Repair! Sir.
Parasuraman S
May 23, 2020 at 8:26 am
Many thanks Yogesh!
Imoudu
May 24, 2020 at 10:56 pm
Good repair. However your new methodology of write up doesn't impact your knowledge of experiences to we young ones in the repair field as it use to be in your former method.The ways you explain your trouble shooting is so simple and explanatory before.I normally gain one thing or the other before. We young ones look forward to mentors like you sir.To me,your former method is better when it comes to knowledge sharing which is the main purpose of this platform.Satisfactory bag is yet to be filled to the brim.
Parasuraman S
May 26, 2020 at 2:09 pm
Yes. I do agree with you. But when the pending work piles up, I may have to cut short my time elsewhere. Moreover, the percentage of people who like to read a lengthy article is very, very less. No time, more importantly no patience! Anyhow many thanks for your feedback!
SijO
October 28, 2020 at 12:44 pm
which is the delay preset in this? how can i reduce the start delay to 30 sec or 1 min. any one knows which capacitor is used for making delay?
JAYAKUMAR V
March 26, 2021 at 8:27 am
Dear Parasuraman, thanks for ur article and ur interest. One quick question. I m having same stabilizer but the delay is not working. During power off On (like, instant off On, in a very very short moment) the delay not working. Stabilizer out supply becomes ON immediate so the fridge compressor goes thru a struggle at that moment. Can u plz tell which of the 3 Presets is for Time delay adjusts? Thanks in advance.
Jayakumar V
June 9, 2024 at 9:39 pm
Dear Parasuraman sir, Namashkaaram. I had a look at your https://jestineyong.com/malfunction-of-both-relays-solved-in-v-guard-voltage-stabilizer-v-g5/
Glad to see the accomishment and thanks for sharing. I have a V-Guard Stabilizer for my refrigerator as mentioned above (posted my query in year 2021)
Now my Relays starts chattering when the Stabilizer is in service for more than 48hrs. Remove the Stabilizer, leave it aside for a day and put it on service, the behaviour is,
Stabilizer works perfect with delay
Output good
But after 2 or 3 days relay chattering starts.
Any guidance here sir for resolving these issues please?
FYI, replaced the transistors, capacitors except capacitors on Relays.
Thanks in advance for your guidance sir