Led Tv Vartical Line
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By Jestine Yong on April 8, 2016 Like
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I received this defective Samsung model: LA40A650AIRXX which has vertical lines superimposed on to the video signal. The intensity of the vertical lines changes with the RGB signals and very prominent on white video signal as shown below:
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How To Repair Samsung LCD TV With Vertical Lines I... Posted 6 hours ago
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Since the vertical lines are not in the static location and always changing with the video display so, it is unlikely the LCD panel is at fault. The possible cause could be the main board, T-con board or both. I performed a grey scale test with the same procedure as in my earlier article on gamma distortion.
Posted 1 week ago
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Completed Another Advanced Electronics Repair Course Completed... Posted 1 week ago
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There is no gamma distortion or noise on the grey scale but RGB vertical lines are being superimposed on it (see photo 1). The intensity of the vertical lines changes with the contrast level as well.
I suspected the gamma IC is faulty although it displayed no gamma distortion. The gamma IC on the T-con board is IC18 with part no. ISL24005. After changing the this IC there is a remarkable improvement on the video quality except for some fine vertical lines still visible only at high contrast level. As I have suspected earlier the main board is also contributing to the problem. Changing the main board will be ideal but may not be worthwhile as the main board is not cheap. By reducing the sub-contrast level and the RGB gain by a certain value in the service mode, the vertical lines are not visible and the reduction in gain and contrast level have not change the video quality significantly as shown below. The customer is very happy and satisfied with the end result as the repair cost does not burnt a hole in his pocket.
Tips: Reworking manually on IC18 is not an easy task due to the QFP packaging being small, thin and leadless. The back of the IC is soldered to the board as well which make it more difficult to remove . After carefully removed the IC without damaging the board, I have a hard time trying to realign the position of the new IC as the solder pads are underneath and difficult to view from the edges. After a few soldering attempts I managed to re-soldered it.
ELECTRONICS REPAIR RESOURCES
This article was prepared for you by SK Wong from Malaysia and he graduated from London with a degree in Electronics and Electrical Engineering. He has more than 40 years of experience in the consumer product manufacturing. With the passion to repair electronic products from young , he has been doing it part time until now. Currently, he can provide turnkey solutions for consumer products including services from idea or concept to design , prototyping , finished products (including electronic,mechanical and plastic parts) and manufacturing.
Please give a support by clicking on the social buttons below. Your feedback on the post is welcome. Please leave it in the comments. P.S- If you enjoyed reading this, click here to subscribe to my blog (free subscription). That way,
you’ll never miss a post. You can also forward this website link to your friends and colleaguesthanks! Note: You can check his previous repair articles below: http://www.jestineyong.com/joven-water-shower-heater-repair/
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lcd tv repair
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LCD TV set with abnormal display repaired. Model: ...
No Power In Samsung LCD TV Repaired
An LCD TV with no display repaired. Model LG: 32LBTD Linkwithin
Name:
Email:
Like
1
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RELATED POSTS
What Everybody Ought To Know About Diagnosing LCD TV T-Con Board With Gamma Distortion
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8 COMMENTS
Chris April 8, 2016 at 4:25 pm
Great repair. Well done with nice photos and explanation. Sometimes we must make compromise between price and repair results. This was worth the repair I think. My best regards. Likes
(1)
Dislikes
(0)
Reply
Humphrey Kimathi April 8, 2016 at 4:32 pm
Excellent work SK Wong, A satisfied customer will always come back and refer others too, Again thanks for keeping the repair cost low in order not to burn a hole in his pocket. Regards Humphrey - Kenya Likes
(0)
Dislikes
(0)
Reply
suranga bandara, Suranga Electronics April 8, 2016 at 5:43 pm
Very professional Mr, SK Wong, you have shown your expertise. Good Repair. Thanks.! Likes
(0)
Dislikes
(0)
Reply
moshe jacobson April 8, 2016 at 7:02 pm
Hi SK....this was really interesting as i have a iMAC G5 with a similar problem and the information on the web was all pointing to the replacement of the LCD panel. So maybe the iMAC LCD panel includes the electronics and replacing the panel coincidentally replaces the defective chip. Likes
(0)
Dislikes
(0)
Reply
skwong April 8, 2016 at 10:05 pm
I have no idea of the IMAC G5 and I guess the IC could part of the panel circuitry. Likes
(0)
Dislikes
(0)
Reply
Hermann April 8, 2016 at 9:26 pm
QFP-packaged ICs are indeed horrible. Especially when they are that small. I have watched a video by Shop Jimmy lately on Youtube. This guy knows how to do it. I think the key is to use just the right amount of solder paste for the bottom pad so that the chip does not float too high on top of the molten solder. It should just sit tight enough to let the contacts take on solder (via the iron), which is applied with a lot of flux gel. Check it out: https://www.youtube.com/watch?v=jf75hmjd6X8 Likes
(0)
Dislikes
(0)
Reply
skwong April 8, 2016 at 10:08 pm
I guess you can use similar method as in the youtube to solder. This IC is much smaller and alignment is a bit difficult. Likes
(0)
Dislikes
(0)
Reply
Yogesh Panchal April 8, 2016 at 9:30 pm
Sir, Thanks for this tip. Likes
(0)
Dislikes
(0)
Reply
LEAVE A REPLY Your email address will not be published. Required fields are marked * Name *
Email *
Website
Comment
You may use these HTML tags and attributes:
ABOUT JESTINE YONG
TECHNICAL TRAINING
HOW YOU CAN START
MUST HAVE-BLUE METERS
REPAIRING E-STORE
FREE SUBSCRIPTION
EXPERTS Privacy Policy Disclaimer Contact Us Archives
DON'T MISS
Polytron LED TV Repaired Posted 6 months ago
Search site
No Power In Toshiba LED TV Repaired Posted 8 months ago
Home > Guest Post > How To Repair Samsung LCD TV With Vertical Lines
How To Solve No Power Problem In Haier LCD LED TV Repair Posted 1 month ago
How To Repair Samsung LCD TV With Vertical Lines Singer 32″ Skyworth LED TV With Dim Display Repair Posted 5 months ago 42″ LG LED TV Repaired Posted 6 months ago
By Jestine Yong on April 8, 2016 Like
1
Ads by Google
Tweet
► TV Repair ► Samsung TV ► LED LCD TV ► PCB Repair Name:
Email:
I received this defective Samsung model: LA40A650AIRXX which has vertical lines superimposed on to the video signal. The intensity of the vertical lines changes with the RGB signals and very prominent on white video signal as shown below:
Terms & Conditions
ELECTRONICS REPAIR CATEGORIES Electronics Repair Categories Select Category
REPAIR TIPS
POPULAR
COMMENTS
How To Repair Samsung LCD TV With Vertical Lines I... Posted 6 hours ago
8
160 GB SATA MAXTOR HDD Repaired This PC was... Posted 6 hours ago
5
New Ebook- Samsung Curved And Slim 4K UHD LED TV Case History Vol 1 Damon... Posted 2 days ago
1
Laptop Blue Screen Of Death Thermal Shut Down ... Posted 2 days ago
14
DVD Spindle Motor Problem Repaired The... Posted 2 days ago
7
Great Idea To Solve Sony Push Power Protect HBDTZ210 Problem Customer... Posted 1 week ago
20
Laptop LENOVO Repaired ...
Since the vertical lines are not in the static location and always changing with the video display so, it is unlikely the LCD panel is at fault. The possible cause could be the main board, T-con board or both. I performed a grey scale test with the same procedure as in my earlier article on gamma distortion.
Posted 1 week ago
18
Completed Another Advanced Electronics Repair Course Completed... Posted 1 week ago
2
Download a Free Audiobook » Try Audible with A Free Audiobook. Listen on iOS/ Android/ Windows!
mobile.audible.com/Free-Trial
There is no gamma distortion or noise on the grey scale but RGB vertical lines are being superimposed on it (see photo 1). The intensity of the vertical lines changes with the contrast level as well.
I suspected the gamma IC is faulty although it displayed no gamma distortion. The gamma IC on the T-con board is IC18 with part no. ISL24005. After changing the this IC there is a remarkable improvement on the video quality except for some fine vertical lines still visible only at high contrast level. As I have suspected earlier the main board is also contributing to the problem. Changing the main board will be ideal but may not be worthwhile as the main board is not cheap. By reducing the sub-contrast level and the RGB gain by a certain value in the service mode, the vertical lines are not visible and the reduction in gain and contrast level have not change the video quality significantly as shown below. The customer is very happy and satisfied with the end result as the repair cost does not burnt a hole in his pocket.
Tips: Reworking manually on IC18 is not an easy task due to the QFP packaging being small, thin and leadless. The back of the IC is soldered to the board as well which make it more difficult to remove . After carefully removed the IC without damaging the board, I have a hard time trying to realign the position of the new IC as the solder pads are underneath and difficult to view from the edges. After a few soldering attempts I managed to re-soldered it.
ELECTRONICS REPAIR RESOURCES
This article was prepared for you by SK Wong from Malaysia and he graduated from London with a degree in Electronics and Electrical Engineering. He has more than 40 years of experience in the consumer product manufacturing. With the passion to repair electronic products from young , he has been doing it part time until now. Currently, he can provide turnkey solutions for consumer products including services from idea or concept to design , prototyping , finished products (including electronic,mechanical and plastic parts) and manufacturing.
Please give a support by clicking on the social buttons below. Your feedback on the post is welcome. Please leave it in the comments. P.S- If you enjoyed reading this, click here to subscribe to my blog (free subscription). That way,
you’ll never miss a post. You can also forward this website link to your friends and colleaguesthanks! Note: You can check his previous repair articles below: http://www.jestineyong.com/joven-water-shower-heater-repair/
Likes
(46)
Dislikes
(0 )
lcd tv repair
You might also like:
LCD TV set with abnormal display repaired. Model: ...
No Power In Samsung LCD TV Repaired
An LCD TV with no display repaired. Model LG: 32LBTD Linkwithin
Name:
Email:
Like
1
Tweet
RELATED POSTS
What Everybody Ought To Know About Diagnosing LCD TV T-Con Board With Gamma Distortion
Most Popular Way To Modify LCD TV Inverter Board
How To Detect Cracked LCD Panel Without Backlight Or Power On
Standby Problem In Singer LCD TV Repaired
8 COMMENTS
Chris April 8, 2016 at 4:25 pm
Great repair. Well done with nice photos and explanation. Sometimes we must make compromise between price and repair results. This was worth the repair I think. My best regards. Likes
(1)
Dislikes
(0)
Reply
Humphrey Kimathi April 8, 2016 at 4:32 pm
Excellent work SK Wong, A satisfied customer will always come back and refer others too, Again thanks for keeping the repair cost low in order not to burn a hole in his pocket. Regards Humphrey - Kenya Likes
(0)
Dislikes
(0)
Reply
suranga bandara, Suranga Electronics April 8, 2016 at 5:43 pm
Very professional Mr, SK Wong, you have shown your expertise. Good Repair. Thanks.! Likes
(0)
Dislikes
(0)
Reply
moshe jacobson April 8, 2016 at 7:02 pm
Hi SK....this was really interesting as i have a iMAC G5 with a similar problem and the information on the web was all pointing to the replacement of the LCD panel. So maybe the iMAC LCD panel includes the electronics and replacing the panel coincidentally replaces the defective chip. Likes
(0)
Dislikes
(0)
Reply
skwong April 8, 2016 at 10:05 pm
I have no idea of the IMAC G5 and I guess the IC could part of the panel circuitry. Likes
(0)
Dislikes
(0)
Reply
Hermann April 8, 2016 at 9:26 pm
QFP-packaged ICs are indeed horrible. Especially when they are that small. I have watched a video by Shop Jimmy lately on Youtube. This guy knows how to do it. I think the key is to use just the right amount of solder paste for the bottom pad so that the chip does not float too high on top of the molten solder. It should just sit tight enough to let the contacts take on solder (via the iron), which is applied with a lot of flux gel. Check it out: https://www.youtube.com/watch?v=jf75hmjd6X8 Likes
(0)
Dislikes
(0)
Reply
skwong April 8, 2016 at 10:08 pm
I guess you can use similar method as in the youtube to solder. This IC is much smaller and alignment is a bit difficult. Likes
(0)
Dislikes
(0)
Reply
Yogesh Panchal April 8, 2016 at 9:30 pm
Sir, Thanks for this tip. Likes
(0)
Dislikes
(0)
Reply
LEAVE A REPLY Your email address will not be published. Required fields are marked * Name *
Email *
Website
Comment
You may use these HTML tags and attributes:
<del datetime=""> <em> <s> <strike> <strong>
Post Comment
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