Assumed after doing the flashlight test and revealing that the left side has a faint display that is not backlight and the right side has absolutely no display that the inverter board (power board in this case) needed replacing. I replaced all three boards on the back and all of the reachable cables, but have the same result. Any thoughts on any next steps ?
Only a service-manual and soldering tools in this case can give results how are the fpc connectors and circuits connected to the screen also a little repair suggestion = to see here much problems caused by wet cleaning the screen and sometimes build-up heat by sun rays or bad airiation.
SOURCE: right side of samsung ln52a580p
This is not an issue with the main board . Its a clear case of faulty LCD controller board or the LCD panel itself is faulty(most likely). I suppose the sound is not affected?
SOURCE: Replaced caps on the psu / inverter board, but
your inverter has gone , if you can see the screen faintly then the inverter isnt illuminating the backlight
it needs replacing
The main power supply regulator section circuit fault. 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. Pull up older posts. http://electronicshelponline.blogspot.com/ It will be best to replace the power supply regulator board as card basis rather than making "Surgery" to it; which usually will make loss for both money and time. Even though you can make it right, it will cost around an amount equal to the cost of a new board; including the cost of (spare parts + service charge) More to say, most of the spare parts to it will be difficult to get from open electronic spare part market. This is true to most of the flat panel TV power supply boards; irrespective of its brand and screen size.
Search the site by type in the "brand name" to your device; in the "Search box at the top right of the display window of the Homepage" to get gathered related posts.
SOURCE: LG 47LN5750 No picture
If you have backlights its not going to be the tcon for future reference. you have some shorted or open LEDs in the panel. Check the voltage going to the LED sets, should be 100 plus volts
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