Im looking for the mainboard for a westinghouse hdtv lcd model number tx42f430s

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Kindly search for a retailer near your area.

What's the TV model number?

From where do you get the 3 volts to feed the master inverter board?
Have you measure all the voltages from the power supply to the main board?
Since the screen is ON when applying the 3.3 volts and the CCFL lights are ON, the backlight inverter boards and the CCFL lights are working. At this point there could be a LCD controller inverter board failure but if that is the case, you could still have audio but no video.
I have the module from a TX47F430S that had a broken screen, the 42 and 47 inches use the same parts.
Let me know if you need further assistance.

Check this link and look for the parts you need as per your LCD model number.

discount-merchant.com has one

can I have your LCD SCREEN? Mine is cracked and I sure could use a new one, or used if thats the case =)

cfusion.com has the mainboard for that. it sounds like you just need a new one, it looks like its about $169

Check this LINK to see if they have any available parts.

Channels with a decimal are digital. You are probally getting the through the air. Currently mine are all the digital versions of the normal channel. Ie: 5.1 digita version of channel 5. Your's maybe different but if there over air it is probally a local station in digital and you should be happy.