Soyo DYLT032D - grey box in corner, no main picture or sound

looks like a small AA battery

Do you have sound? If you have sound but no picture, it is possible you have a backlight problem. Let me know

can you show a pic

check your input settings on the cables make sure they are in right and the tv is on the right input otherwise you may have a bad screen

• If your DirecTV box supports HDTV then connect it using either an HDMI cable from the box to the TV (located on the back, labeled HDMI 1,2,3,etc.).

• If the box is not an HDTV box then connect it with a RGB (red, green, blue) composite cable from the box to the TV.

• If the RGB output is not on the ack of the box then connect using a standard coaxial cable.

[NOTE] In order for the quality of the picture to be HD, use the RGB for digital (Better), or the HDMI for High-def (Best)

sounds like the screen is stained

please check your power inverter this is common problem of all LCD type. change bad capacitors from secondary power supply near SMPS. hope this can help you.

I have a philips universal remote changed batteries now the codes lost

Sounds like the Main Mother Board is the problem. Basically, it's the brain inside the TV. Controls and functions is that board's job.
Soyo parts are hard to come by. You can try running the number off the mother board on the internet and maybe a supplier will pop up.
Their Soyo.com web site isn't working. So, I'm thing they maybe out of business.
If you have some electronic experance and if your lucky, the heatsink on the chip processor is the problem.

Replace all bad capacitors(end raised up) on power suply's main board. That'll fix it. fixed mine :)