Our VX42L display goes black after an hour use but has sound

PERHAPS A TRIP TO A LOCAL REPAIR SHOP ,SELF FIXING USUALLY IS MORE COSTLY .

1,the color starts to go out, it become the white and black ,
2,then,the projector running off after only a few minutes,
it is a general issue:the inductor need to be cleaned
Use a cotton swab moistened with alcohol to clean the inductor.
the inductor (Sensing element),is near to the Color Wheel.
the industor : is a black little element,as little as a sesame seed
any questions, feel free to ask me
have a nice day!
Jerry Lampdeng Limited

Usually a few electrolytic capacitors on the power supply board are swollen or burst.

Replace the main board

You posted under Leviton 6124 programmable timer.
If this is not your timer, add a comment
Leviton 6124 manual:
http://waterheatertimer.org/images/6124-manual.pdf

If you have different timer, look at link below to help identify timer.
Leviton Timers:
http://waterheatertimer.org/Leviton-timers.html

Leviton 6124 timer instructions:
Timer comes with plastic protector over display >> remove protector to see display.
Large button is manual override.
After timer is wired, push override to make sure Load turns ON and OFF.

Timer has 3 small buttons located below manual override used for programming
Display is divided into 24-hours with am times on left and pm on right.
24 Hour day is divided into 1/2 Hour segments
Each 1/2 hour must be set for ON or OFF

Start by pushing left-side event-cursor-advance-button and it scrolls down each 1/2 Hour.
Once you arrive at 1/2 hour > make decision if you want timer ON or OFF for that half hour.

Press event-set-reset-button in center to set ON-OFF for that 1/2 hour.

Press center event-set-reset-button and solid black rectangle fills in for that half hour.
Solid black rectangle means timer ON for that 1/2 Hour.

Once solid square is selected, press event-cursor-advance-button and cursor advances again and starts filling in black rectangles for each 1/2 Hour period.
Keep filling in black rectangles for all times you want timer ON.

When you reach 1/2 Hour period you want timer OFF, then press center event-set-reset-button so that no black rectangle is visible for that 1/2 hour.
No black rectangle means timer is OFF for that half hour.

To set current time, use right-side time-advance-button.
Press and hold time-advance and time cursor advances down through the am and then pm hours.
Stop cursor at current time, and timer is ready.

Sounds like your YBL-Y Buffer lower board is going out. There are 3 boards here. The Y buffer upper which controls the top half of the display, The Y buffer lower controls the bottom half and the Y-SUS main control those two boards. They work in unison. Usually if one goes out you have to replace all. You can also get lucky and just repalce the YBL and all may be well. Now if they are vertical lines up and down the OSD-On screen display, then this is indicitive on dry solder joints on the D, G E, F boards. Hope this helps...

Leviton 6124 timer instructions:
Timer comes with plastic protector over display >> remove protector to see display.
Large button is manual override.
After timer is wired, push override to make sure Load turns ON and OFF.

Timer has 3 small buttons located below manual override used for programming
Display is divided into 24-hours with am times on left and pm on right.
24 Hour day is divided into 1/2 Hour segments
Each 1/2 hour must be set for ON or OFF

Start by pushing left-side event-cursor-advance-button and it scrolls down each 1/2 Hour.
Once you arrive at 1/2 hour > make decision if you want timer ON or OFF for that half hour.

Press event-set-reset-button in center to set ON-OFF for that 1/2 hour.

Press center event-set-reset-button and solid black rectangle fills in for that half hour.
Solid black rectangle means timer ON for that 1/2 Hour.

Once solid square is selected, press event-cursor-advance-button and cursor advances again and starts filling in black rectangles for each 1/2 Hour period.
Keep filling in black rectangles for all times you want timer ON.

When you reach 1/2 Hour period you want timer OFF, then press center event-set-reset-button so that no black rectangle is visible for that 1/2 hour.
No black rectangle means timer is OFF for that half hour.

To set current time, use right-side time-advance-button.
Press and hold time-advance and time cursor advances down through the am and then pm hours.
Stop cursor at current time, and timer is ready.

Does it look like a 3D image?
Would you be able to post a picture of the TV with the mention lines?

Sounds like your having problems with your Y-main(upper buffer) is getting too hot. The IC's located on this board are really bad about going out a lot. If you take the back cover off your Plasma. U will see that the manufacture of the panel is Samsung and the panel model is probably S42AX-YB01. you should be able to purchase the board. probably will run about $ 150.00.
Hope this helps

I've been finding quite a few HDMI related problems over the past year and it seems to be increasing. The problem usually is due to the cable being somewhat heavy. The plug sticks straight in and hangs. The weight of the cable uses the downward momentum and starts ripping the solder connections from the televisions HDMI input. When the audio becomes distorted, try moving the cable and see if it clears up. If it does, then, that's the problem. If not, then the problem is more than likely the audio circuit. Either way the Main PCB needs to be replaced. After replacing the Main board, I suggest using component inputs instead (Same quality picture, just more cords), because, the chances of another problem caused by HDMI is likely. Hope this helps.