LCD TV With Strange Colors Repaired. Model: Sansui 3210
An LCD TV was brought to my shop for repair. It is 32 inches TV and when I powered on the device, I saw a strange color formation on the screen. Take a look
From experience, this an issue that I see a lot on LCD TV sets and the main cause for it is the T-Con board.
I usually I replace the whole board but today, since I know the cause of the issue, I decided to replace only the part that has to do with this fault.
This is the T-con board; it is suppose to get 12 DC volts at the main fuse of it and the reading was there because I could see a picture on the screen.
The main IC that has to do with colors is called the Gama IC and the part number is AS15G. It is clearly marked by an arrow in the picture. How did I know it was a faulty IC? Well, turn the TV on and put your finger on it, you will feel it getting hot and that is enough indication that it was faulty.
With re flow hot station and some flux paste on this IC I was able to take it off board and replace it with a new one that I bought off an online seller.
I bought a lot of them actually because they get faulty very often.
Once I cleaned the area of the old IC, added some flux paste to it and with a r flow station with hot are set to 350 C temperature and the air flow to 80 I was able to put the IC back and test the TV set.
As you can see, there is a big difference in the picture display on this set. The customer was happy to get it back because he was not expecting to get fixed.
Mission Accomplished.
This article was prepared for you by Waleed Rishmawi, one of our ‘Master Authors’ and currently working in the Bethlehem area of Palestine repairing electrical and electronic equipment.
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Note: You can check his previous repair articles in the link below:
https://jestineyong.com/an-xbox-one-station-that-keeps-shutting-down-repaired/
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Albert van Bemmelen
June 23, 2019 at 6:54 pm
Very nice component based repair. Not something I've seen a lot happening with that same discolouring problem. But if buying a lot of those same chips cuts you a deal for fast fixing other similar T-con boards it sure is a smart move!
jkimmachona
June 23, 2019 at 7:12 pm
nice repair article once faced same faulty but managed to solve it by getti into factory mode of the tv set and changed the rvds map to another value
Waleed Rishmawi
June 24, 2019 at 2:36 pm
Jkimmachona: yes, there are some repair situation that you can enter the factory mode and resolve it but when the IC is very hot when turning the TV on, the factory mode will not change the issue. The Gama IC was shorted and when replaced, the ic had a normal heat and the TV was back to normal.
have a blessed day and thanks for your input
Waleed Rishmawi
June 24, 2019 at 2:33 pm
Albert: I already bought a lot of these chips and it is going well. have a blessed day
Ghashaan
June 24, 2019 at 11:35 am
Remarkable expertise on chip chip level repair! It has opened my mind to the possibility of succeeding in difficult repairs.
Waleed Rishmawi
June 27, 2019 at 5:14 pm
Ghashaan: thank you very much. if you set your mind to it, you can do it.
beh
June 24, 2019 at 3:22 pm
Thanks for very useful article.
Waleed Rishmawi
June 27, 2019 at 5:15 pm
Beh: you are most welcome. have a blessed day
Robert Calk Jr.
June 24, 2019 at 10:19 pm
Nice work, Waleed! Nice soldering also. I use 360C to remove IC's and 340C to solder them, along with using my board preheater.
I would be afraid of blowing resistors and capacitors all over the place if I used 80% air! Did you use a rework tip designed to fit that IC?
I am getting pretty good at microsoldering!
Yogesh Panchal
June 25, 2019 at 1:00 am
Waleed,Good fast conclusion & Repair.
Waleed Rishmawi
June 27, 2019 at 5:19 pm
Yogesh: thanks man. have a good and blessed day
Gary Gemmell
June 25, 2019 at 12:01 pm
Good addition to toolkit is an FLIR thermal imaging camera!
https://www.youtube.com/watch?v=8fJ6gQc-6X8
Waleed Rishmawi
June 27, 2019 at 5:21 pm
Gary: thanks for your input. have a blessed day
ThandoSebeneleMavimbela
June 25, 2019 at 5:12 pm
Wow thanks God for having a professional. I don't know what to say because l was known nothing but now l know something.
Waleed Rishmawi
June 27, 2019 at 5:23 pm
ThandoSebeneleMavimbela: knowing something is good. keep up the good work and have a blessed day
Matsuokai
June 26, 2019 at 11:35 am
Great work, Waleed. Congratulation and thanks for your valuable, helpful info.
Waleed Rishmawi
June 27, 2019 at 5:24 pm
Matsuokai: thanks man. I am glad you liked it. have a blessed day
Parasuraman Subramanian
June 26, 2019 at 1:31 pm
A very good and informative article. Thanks for your guidance on the temperature and airflow to use on this IC. That's a very, very useful input.
Waleed Rishmawi
June 27, 2019 at 5:27 pm
Parasuraman: I am glad you liked it. i have to note something here when it comes to temperature and airflow that every machine is different so you have to get the feeling of your machine and with experience you will do just fine
abdellah kamli
June 27, 2019 at 3:53 am
Careful and intelligent repair, these tiny chips require technical expertise and professional know-how, as you mentioned there is behind your work an experience that helps to solve complicated failures without delay, what a joy to draw a smile on the face of the customer after a successful troubleshooting. Yes there is big difference between the pictures and the subtitle (but not now) is clear, your customer will enjoy with his soap opera. Congratulations Waleed! be in peace and happiness
Waleed Rishmawi
June 28, 2019 at 2:53 pm
abdellah: thank you my friend. yes it takes experience to do it but doing what need to be done is how to gain that experience. have a blessed day
Francisco Rica
June 28, 2019 at 3:53 am
Good job Waleed ! How about your words "How did I know it was a faulty IC? Well, turn the TV on and put your finger on it, you will feel it getting hot and that is enough indication that it was faulty."
Can you give me same more detailled indications? If one IC in a PCB it is hot, then is a clear indication that is a faulty IC? Or could an Ic be a bit hot and be not faulty? How many seconds could you touch the Gamma IC till you sense the need to retire the finger?
Waleed Rishmawi
June 29, 2019 at 7:00 pm
Francisco: thanks. this IC was burning hot not just worm..it will burn your finger. in my case it was few seconds and I could not touch the IC any more. usually, when colors are bad in a tV set, first thing I check is the voltage reading at the T-con and you suppose to get 12 DC volts. if you are getting that, then move on to this chip and feel it
Francisco Rica
June 30, 2019 at 4:23 am
Thank you Waleed for the information!
Waleed Rishmawi
July 1, 2019 at 3:27 pm
Francisco: you are most welcome
REZA
December 5, 2019 at 4:11 pm
Hi Waleed Rishmawi
THANK U FOR SHARE YOUR experience.
GOOD LUCK