Power IC and Zener Diode Shorted in DVD Player Repaired
The complaint of this LG DVD receiver and player with model HT355SD was no power. No power symptom can be caused by many factors such as open main fuse, bad on/off switch, bad power components, shorted mainboard and etc.
I had to open up the casing (see the photo below) in order to see if there is any components in the power section that had burnt and etc. The main fuse was good and no burnt components.
What I saw was ants nest surrounding the legs of the power IC and power FET. The circuit track of the power IC was corroded and this could be the problem of no power symptom. See the three photos below:
As usual, just before I replace the components I will check the surrounding components and I found a zener diode shorted. If you would like to learn how to check components like a professional you can get Jestine’s Ebook on testing components. This ebook is a must for all beginners.
The shorted zener diode
Next I cleaned the board fully and bought the new components-one zener diode and power ICE3BR4765C and fixed into the board and power On.
The power came back and worked beautifully. It was an easy job and the parts also not expensive.
This article was prepared for you by Suranga Bandara who owns an Electronics shop in Anuradapura, Sri Lanka.
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Note: You may check out his previous repair article in the below link:
https://jestineyong.com/two-ics-burnt-in-usb-mini-amplifier/
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Yogesh Panchal
June 27, 2016 at 9:23 pm
Suranga,
Good job!
Parasuraman S
June 27, 2016 at 10:12 pm
Great! Another set saved! Ants are sometimes not only ants in pants, in Electronic Equipment too! I am working on a Philips DVD player, where the ants have spoiled the mother board! (Strange coincidence)
Albert van Bemmelen
June 27, 2016 at 11:51 pm
Nice job Suranga! But this happens not only in India.
Also in the southeast US these invasive 'crazy ants' are chewing up electronics in the southeast US, and researchers believe the tiny insects have caused $146.5 million in damage to iPhones, laptops, DVR cables, and other gadgets in just one year in the state of Texas.
The crazy ants are attracted to electrical wiring, and their electrocuted carcasses are often found scattered around power outlets, transformers and switches. This invasive species from Brazil and Argentina is immune to chemicals that kill off other types of insects, such as the common red ant, and residents with an infestation may need to call pest control to rid their homes of them.
The tawny crazy ant, formerly known as the raspberry crazy ant, was first discovered in Houston in 2002, and now exists in several counties in Texas, Florida, Mississippi and Louisiana. This species is called “crazy” because the trail it leaves behind is so irregular and erratic.
In a one-year period, these ants destroyed $146.5 million worth of electronics and wiring in the state of Texas, researchers from Texas A&M University told ABC News. But even if the ants fail to chew up the products, their carcasses can cause just as much destruction. Researchers found that when the ants are electrocuted, they wave their abdomens in the air, omitting a particular scent that attracts other ants. As each of the ants dies off, the bodies build up in electric switches or devices, causing switches to get stuck or the system to short-circuit.
So we are warned for this invasion of Insects. We in The Netherlands also detected the Asian Tiger Mosquito in a local car tires plant.
suranga bandara, Suranga Electronics
June 29, 2016 at 2:33 pm
hi, Mr-Albert van Bemmelen,
Thanks you !
Paris Azis
June 28, 2016 at 4:04 am
Hi Suranga
Ants and lizards have agreed to keep you well in business! How amazing!
Anthony
June 28, 2016 at 5:13 am
Nice electronic and artistic repair of the device Suranga ! Thanks for sharing your repair stories here with us !
Good job
suranga bandara, Suranga Electronics
June 29, 2016 at 2:35 pm
Hi All,
Thanks so much!
for your Comments.
Robert Calk
June 29, 2016 at 7:06 pm
Good job, Suranga.
Humberto
June 29, 2016 at 10:21 pm
Hi Suranga. Good repair.
In my country cockroaches and mice destroy many appliances. Ants too
Francis Fernandes, Mumbai, India
July 6, 2016 at 8:40 pm
Hi,
Can anyone throw some light about the equivalent no. of a shorted/exploded ic in the power board of two Soyer/F&D DVD players. In the Soyer model the no. was 4SY103 and in the F&D DVD player which exploded (probably due to overheating) after a few hours of play was partly visible as 5805 or something similar. Thanks and much obliged.
Francis Fernandes
Luciano Khware
August 12, 2016 at 5:59 pm
Job well done Mr. Suranga! Keep it up
Kartik Dalei
September 23, 2016 at 6:43 pm
Sir,
my onida dvd player model no DFX7410 not getting on . I checked power board is ok giving +12V,-12V & +5V DC.On/Off switch & Power LED are ok.pl guide me.
David
November 2, 2018 at 3:36 am
hy mr jestine ,i would like to the equivalent of this ic ICE3BR4765C
Jestine Yong
November 6, 2018 at 11:15 am
Hi David,
Sorry I do not have the info of replacement for this IC.
Jestine
Clement
April 4, 2019 at 12:13 am
Please I need the value number of LG Home theater Ht358SD power IC, my Burnt to ashes.
Iniyanrajan
September 24, 2019 at 11:35 pm
I have a shorted Zener diode near my STR W6053S...I has written as 33B5T on it....how to find the value of the zener diode or is there any equivalent replacement for it...plz help me with this....without that I am not getting those 5 and 12 Volts in the output
Ebiri Ben
July 12, 2020 at 9:05 pm
I have the same product but the fault is no sound apart from the woofer...I've been using it for sometime now before it developed the fault,I'm 100% the sound fault is not a connection problem.
Please what could be the fault?
I opened the system already and there are no burnt components
Nandika Lasantha Upathissa
September 4, 2020 at 7:04 am
That's very help artical for me.my LG LHD 423 home theater system has no power on. i'll follow your guidance.
Justice
October 27, 2020 at 4:46 pm
Hi all. You will not believe I am returning to my old saved article since covid has stopped everything. Yes Suranga this was and is still nice work and interesting.In South Africa I do also suffer from these crazy ants and geckos. What an explaination by Albert wow !! thanks to you too.
Gutoiu Razvan
December 22, 2020 at 12:06 am
Hi! I repair power supply for my LG HT 353 but i'm not sure what is corect voltage for F+ , F-, and VKK.
Can you help me with this voltage ?
The other voltage is OK.
Rotimi Fawehinmi
May 31, 2021 at 6:31 am
Good job sir. Please I would like to know where to purchase an original HT355sd main board or the whole machine without speakers from Preferably an online store.
Thank you.