Sanyo dp42848 black spots and scrambled screen

either at-con board or power board.

Well this cloud be due to 2 reasons

1. It could be that you are have low reception from your DTH operator or cable operator
2. There could be fault in our TV

You better get it checked by a professional or contact Sanyo
NOTE: the first one applies only if all the TV's in your home are acting the same way

If you wish to get some details; check the site linked here. Pull up older posts. Surf the site with patience. http://electronicshelponline.blogspot.com/
Faults & possible causes to LCD screen are given with illustrations. You can get an idea about the fault to an extent.

Display panel fault. Irreparable.

There are so many reasons for spots appear to LCD screen. If you wish to get some details, check the site linked here. http://electronicshelponline.blogspot.com/ Pull up older posts. Check the site in 'Mosaic' view. It will make search easy. Screen-shots to defective LCD screens are given, which I cant include it here. Check it, and make sure the fault to your TV. Good Luck.

Sounds like this:
http://www.coppelltvrepair.com/p/428/sanyo-dp42848-p42848-00-backlight-inverters-replacement-for-dark-screen-no-image-problem

Of course your TV model may be different and the inverters may be different...but the description points to the same problem.

This is almost certainly what you need:
http://www.coppelltvrepair.com/p/428/sanyo-dp42848-p42848-00-backlight-inverters-replacement-for-dark-screen-no-image-problem

There is sone short circuted components at its main board. Contact a technician. This is not a user repairable work.

Replace the Main board if your not hearing any audio from the set.

Hi,
It only tells us that the inverter cable needs to be reseated or replaced. It's not an expensive repair so fortunately you can consult any local certified technician and have them work on this.