I have a Samsung tv pic does not work but have sound..model #40pfl3705D/f7. What part needs replaced...t-con board?? And if it is.. how do I know which board is t con board?

If you wish to get some details; check the site linked here. Pull up older posts. Surf the site with patience.
http://electro-medical.blogspot.com/
http://electronicshelponline.blogspot.com/
Search the site by type in "T Con board" in the "Search box at the top right of the display window of the Homepage" to get gathered related posts.

Fault to the main power supply regulator section. Either it will be a separate board, or the part of main board. Check and replace damaged component/s at its main power regulator [SMPS] section circuit. Contact any service technician. If you wish to get some details; check the site linked here. Surf the site with patience. Pull up older posts.
http://electro-medical.blogspot.com/
http://electronicshelponline.blogspot.com/

Back - light problem. Check and replace damaged component/s at its back-light inverter board, or replace this board as card basis. If you wish to get some details; check the site linked here. Surf the site with patience. Pull up older posts. It will be best to replace the inverter board as card basis.
http://electro-medical.blogspot.com/
http://electronicshelponline.blogspot.com/
To some model sets; especially LED back-lighted types; the back-light inverter circuit will be part of the main power supply board [SMPS]. In such cases, the power supply board might need replacement. To some models sets, the back-light inverter and SMPS section circuit will be integrated at its main board itself. If so; the main board should be replaced.

Main board. T con board is only involved with video issues. Main board goes both ways and since you already replaced the T con board that is your only alternative. U got backlite so inverter board is good.

Hi.
Probably the t con board of your TV is faulty. T con board is the one which drive the lcd pixels. You have to replace the T con board to get it work properly.
Here i have added the picture of the T con board of your tv for reference.also added the video to know how to replace the T con broad.
RCA L32WD22 T-CON BOARD UT-5531T03088-76J



Samsung TV Repair How to Replace Con Board in LJ94 02 705E Model How to...
www.electro-medical.blogspot.com

inverter board replace or can fix if know how

Len

There are 2 posiblities 1. T-con board is bad needs replaced. 2. Back lights have gone bad take a flash light to the screen in an angle and see if you see any picture? if so back lights are gone they can be replaced.

Sounds like T'Con board fault. Contact the authorized service center for Philips. If you wish to get some details; check the site linked here. Viewing it in "Mosaic" or "Magazine" will make surf easy. Pull up older posts. Surf the site with patience. Do a search by type in the brand name of your device at its search box.
http://electronicshelponline.blogspot.com/

Sounds like a failed T-Con board, but hard to say without seeing the set.

looking online as i have same problem, sound without picture points to T CON board. approx $50-100 part + labor