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Dead GIEC Portable Dvd, Tv, Usb Multimedia Player Repaired
By Jestine Yong on March 16, 2024
This multimedia player is my operational device i use to test repaired tv and dvd player because it has av input and output. Last year it stopped functioning, so i just abandoned it since i don’t have any idea of its circuit. So this month (Feb) i summon courage to give it a try.
I first try to charge the cell and it charged but when switch on, the switch on blue led didn’t on, dvd disc didn’t roll and screen was dark. So i open it from bottom by removing the screws, checked cell voltage…ok. So i thought probably the cell has voltage but can’t retain current, so bought another cell and replace it. Immediately i switched on, there was a spark and smoke from charging circuit, when i checked on the cell wire, i observe the wire pins i.e + & – are not on same position with the one on board, so this caused the spark. Then remove the Cell and return original cell back to it and try to charge but unfortunately the charging red led didn’t light again, no more charging.( Lessen learnt from this mistake is we should always check +/- pins of cell before fixing on any device.
So i continue checking for bad/ burnt components around charging circuit and discovered an ic with mark number 8205A(it’s dual N – channel mosfet) had burnt.
So i soldered it out and fixed a replacement, connected 12V /3AMP adopter to device and the charging red led lit. So i now start to solve original problem: device not functioning.
So applying experience gained from repairs of china combo mother board tv, i started checking vital voltage points i.e 12V, 5V, 3.3V, 1.2V. All voltages were present except 1.2v. This voltage (1.2v) is being produce by a 5 pins voltage regulator. I guess this voltage is sent to flash and microcontroller ICs. Whenever you see this voltage regulator on any device, fake mark number is usually printed on it which we can’t find on internet datasheet.
So i extracted a working one from scrap decoder device and replace it for the bad one on my multimedia player. Infact the bad 5 pins voltage regulator was shorted between pins 2 & 3(gnd & output).Change also an e-cap that is off its esr.
Then i power the player, having place a dvd disc on the tray, it played with audio but no picture on screen. So i screwed open the back of screen to check connecting flex between main board and screen….the flex was bad.
I couldn’t get a new one from local market, so i bought a wider flex and cut it to the size of the original flex (27pins) carefully, then fix it and retest again…Wow screen show sharply with good picture and with good audio. See pictures below. This is the finished repaired work.
This article was prepared for you by Imoudu Onwumah from Nigeria. He is 62 years old and has just 3 years experience in electronics repairs. I started career in hotel industry as a chef, but then I was doing repairs only in electrical repairs as a hobbyist. In 2018, I decided to learn about electronics which through Jestine’s electronics e-books and holding my hand, am an electronics techie today.
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Note: You can read his previous article on Dead DVD Player Alive Again
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Tayo
March 16, 2024 at 1:27 pm
Clutch save Imoudu!
Challenged at every step yet undeterred.
These throw away electronics from China are a real problem.
Well... only a problem if you are crazy enough to try to make a meaningful repair of them. Ha!
Good lesson though. If you can fix these things (with their uncertainty) then you can likely fix anything.
Parasuraman S
March 16, 2024 at 1:30 pm
Vow! It took a lot of effort to set right an old DVD Player. You learnt a few hard lessons too! But I appreciate your steadfastness! Many thanks for sharing, dear!
Yogesh Panchal
March 16, 2024 at 3:07 pm
Good Job! Imoudu
Albert van Bemmelen
March 16, 2024 at 8:42 pm
Nice repair and good story Imoudu! Liked your good explanation and honest mistake with the clear photos.
Glad that your mini AV test monitor with video in- and output is restored to your often used equipment.
Imoudu.O
March 17, 2024 at 4:08 am
Tayo
Thanks for your comments,china products have over taken electronic market in my country, we just have to live with them.
Imoudu.O
March 17, 2024 at 4:11 am
Albert van
Thanks for your comments, i keep on learning every day.
Imoudu.O
March 17, 2024 at 4:12 am
Parasuraman.S
Thanks sir.
Imoudu.O
March 17, 2024 at 4:17 am
Parasuraman.S
Thanks sir.We can't do without those stuff at times!
Waleed Rishmawi
March 18, 2024 at 9:27 pm
sometimes a mistake we do will set us back but that did not happen with you. you kept going and you found the fault, so I congratulate you on that success. keep up the good work. we might learn the hard way but we will learn from it. thanks for sharing and have a blessed day
Imoudu.O
March 19, 2024 at 7:42 am
Waleed.R ..... Thanks friend for your encouraging words.