LCD TV and Monitor basic troubleshooting guides

[budm]

Re: LCD TV and Monitor basic troubleshooting guides

Buck converter constant current LED driver topology.
https://cdn.badcaps-static.com/pdfs/...019082cabf.pdf

[budm]

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

[budm]

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

[budm]

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.

[budm]

Re: LCD TV and Monitor basic troubleshooting guides

ROHM TechWeb: https://techweb.rohm.com/tech-info/

[GROgS01]

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.

Thank you for pointing me in the right direction Budm

[budm]

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.

[OzMaster]

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.

[budm]

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

[budm]

Re: LCD TV and Monitor basic troubleshooting guides

LED failure mode.

[watanirar]

Re: LCD TV and Monitor basic troubleshooting guides

Thank you very much for this post

[budm]

Re: LCD TV and Monitor basic troubleshooting guides

Understanding NTC rating.

[budm]

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://cdn.badcaps-static.com/pdfs/...e59a54365e.pdf

[budm]

Re: LCD TV and Monitor basic troubleshooting guides

Backlights PWM.
https://www.tftcentral.co.uk/article...modulation.htm

[thoma]

Re: LCD TV and Monitor basic troubleshooting guides

http://www.lcdrepairguide.com/tcon-panel/

[budm]

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

[mohamed alee]

Re: LCD TV and Monitor basic troubleshooting guides

Thank you very much

[thoma]

Re: LCD TV and Monitor basic troubleshooting guides

Vestel Powerboard 17ips71

[thoma]

Re: LCD TV and Monitor basic troubleshooting guides

Vestel Powerboard 17ips55

[KijijiUser]

Re: LCD TV and Monitor basic troubleshooting guides

thank for infor share