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Old 08-03-2019, 03:39 PM   #421
budm
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Default Re: LCD TV and Monitor basic troubleshooting guides

Typican T-CON Voltages:
1. Vin: 12V (we confirmed as present)
2. Vdd (Vlogic, Vddd): 3.3V
3. Vda (Vs, Vsource, Vdda Avdd): 14V to 20V
4. Vgh (Vgon, Von, Vddg): 20V to 30V
5. Vgl (Vgoff, Voff, Veeg): -5V to -7V
Attached Files
File Type: pdf tps65162.pdf (2.12 MB, 58 views)
File Type: pdf TPS65167a.pdf (1.56 MB, 50 views)
File Type: pdf RICHTEK SG010_2018_02.pdf (2.56 MB, 49 views)
File Type: pdf RT6905 sch.pdf (63.2 KB, 42 views)
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Basic LCD TV and Monitor troubleshooting guides.
http://www.badcaps.net/forum/showthr...956#post305956

Voltage Regulator (LDO) testing:
http://www.badcaps.net/forum/showthr...999#post300999

Inverter testing using old CFL:
http://www.badcaps.net/forum/showthr...er+testing+cfl

Tear down pictures : Hit the ">" Show Albums and stories" on the left side
http://s807.photobucket.com/user/budm/library/

TV Factory reset codes listing:
http://www.badcaps.net/forum/showthread.php?t=24809
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Old 08-30-2019, 12:09 PM   #422
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Default Re: LCD TV and Monitor basic troubleshooting guides

http://www.lcdrepairguide.com/tcon-panel/
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Old 09-08-2019, 06:16 PM   #423
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Default Re: LCD TV and Monitor basic troubleshooting guides

Backlights PWM.
https://www.tftcentral.co.uk/article...modulation.htm
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Old 09-18-2019, 12:24 PM   #424
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Default Re: LCD TV and Monitor basic troubleshooting guides

T-CON Voltages:
http://tvrepairsolution.blogspot.com...lcd-panel.html
http://tvrepairsolution.blogspot.com...l-rowgate.html
https://lapputerservice.com/2019/04/...d-there-point/
https://elinux.org/images/4/48/TFT-white-paper.pdf

Last edited by budm; 09-18-2019 at 12:37 PM..
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Old 09-20-2019, 05:26 PM   #425
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Default Re: LCD TV and Monitor basic troubleshooting guides

Understanding NTC rating.
Attached Files
File Type: pdf NTC 920-325D-LR-245176.pdf (128.2 KB, 41 views)
File Type: pdf NTC(5).pdf (325.4 KB, 32 views)
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Old 10-15-2019, 03:01 AM   #426
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Default Re: LCD TV and Monitor basic troubleshooting guides

Thank you very much for this post
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Old 11-12-2019, 05:59 PM   #427
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Default Re: LCD TV and Monitor basic troubleshooting guides

LED failure mode.
Attached Files
File Type: pdf LED-Failures-Modes_and_Mechanisms.pdf (569.3 KB, 98 views)
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Old 12-01-2019, 11:28 PM   #428
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Default Re: LCD TV and Monitor basic troubleshooting guides

LED Vf vs If graph, thanks to ngth82
See the story here to see why it is important to get the spec of the LED from seller: https://www.badcaps.net/forum/showth...867#post928867
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File Type: jpg led_vf_if_chart.jpg (149.7 KB, 28 views)

Last edited by budm; 12-01-2019 at 11:30 PM..
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Old 12-27-2019, 06:13 PM   #429
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Default Re: LCD TV and Monitor basic troubleshooting guides

Need advice...65" samsung, vertical colored lines at first, then a white/grey garbled flashing screen. I think it's the T-Con board.
Not sure if I can post a pic of the screen, bit if someone is willing to look at it, I could email.
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Old 12-27-2019, 10:22 PM   #430
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Default Re: LCD TV and Monitor basic troubleshooting guides

You need to make a thread for you TV, make sure to put down the Make and model number, also attach good clear pictures of the whole backside of the TV showing all the boards.
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Old 04-11-2020, 05:29 PM   #431
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Default Re: LCD TV and Monitor basic troubleshooting guides

Quote:
Originally Posted by budm View Post
You need to make a thread for you TV, make sure to put down the Make and model number, also attach good clear pictures of the whole backside of the TV showing all the boards.
Thank you for pointing me in the right direction Budm
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Old 07-20-2020, 07:06 PM   #432
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Default Re: LCD TV and Monitor basic troubleshooting guides

ROHM TechWeb: https://techweb.rohm.com/tech-info/
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Old 08-06-2020, 05:38 PM   #433
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Default Re: LCD TV and Monitor basic troubleshooting guides

My old Video lab (I also had Audio lab for testing audio products too) for R&D Development, test, products validation, failure analysis, compatibility with Sources and Sinks validation in conjunction with TV/Display manufacturers. 8K products were in the process when I was laid off due to 'making company look good and lots of profits by laying off people before selling the company'. I have been with them for 25 years!
Right now I am just glad not have working 10 ~12 Hours a day.
Attached Images
File Type: jpg Bud's Video test lab 2019_1.jpg (536.2 KB, 19 views)
File Type: jpg Bud's Video test lab 2019_2.jpg (484.3 KB, 16 views)
File Type: jpg Bud's Video test lab 2019_3.jpg (515.4 KB, 16 views)
File Type: jpg Bud's Video test lab 2019_4.jpg (493.2 KB, 13 views)
File Type: jpg Bud's Video test lab 2019_5.jpg (604.0 KB, 14 views)
File Type: jpg Bud's Video test lab 2019_6.jpg (510.6 KB, 15 views)

Last edited by budm; 08-06-2020 at 05:39 PM..
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Old 08-09-2020, 05:33 PM   #434
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Default Re: LCD TV and Monitor basic troubleshooting guides

Learn about diode and other semi.
https://toshiba.semicon-storage.com/.../discrete.html
https://toshiba.semicon-storage.com/...ledge/faq.html
Attached Files
File Type: pdf TOSHIBA_discrete-basic-chap2_en.pdf (860.0 KB, 17 views)

Last edited by budm; 08-09-2020 at 06:25 PM..
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Old 08-17-2020, 08:15 PM   #435
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Default Re: LCD TV and Monitor basic troubleshooting guides

When your 5 Band Resistor is not a 5 Band resistor.

https://forum.digikey.com/t/when-you...-resistor/1501
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Old 11-11-2020, 11:57 PM   #436
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Default Re: LCD TV and Monitor basic troubleshooting guides

Buck converter constant current LED driver topology.
https://www.st.com/resource/en/appli...lectronics.pdf
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