Chosen Solution
Greeting everyone,I have LG 42SL90,there is Sound but No Video only White screen can changing channel,switching between TV/Radio other than that nothing else. Cleaned up every possible connectors but still no go. I noticed that the led driver board blinking red light,but seem all LED’s are on. Any suggestion what could be the problems really appreciated,thank you. Regards. Jeff Update 11/27/20
Update (11/24/2020)
@koalawine the white screen would mean that your backlight is on but you do not get a video signal. Check your cables for any shaved insulation and the connectors for loose pins. Try different video input sources and see if that changes anything. This can be a main board, T-con board error as well as the LCD driver board error (which is part of the panel and not DIY removable). You can always post pictures of you boards with your QUESTION so that we can see what you see. Adding images to an existing question
@koalawine What is the full model number of the TV? Here’s the No video/normal audio troubleshooting page from the LG 42SL90 QD service manual. Hopefully it will be the same for your model Also did you check if there are any menu screens shown or if there is video when using other input types, i.e. HDMI, AV etc you didn’t say? If only when selecting DTV signals (RF coax input ) then go to p.44 to see the flowchart.
