Help When the set has been off all day..You can turn it on and the picture goes down to a small square then back big..Does this til it gets warm.. about 10 mins max. but I know it will only get worse...Any ideas

Difficult to go on only does not make sharp pictures anymore.
Seeing one picture says more than 1000 words. Still I give it a try.
When you are sure you did not change the focus settings and don't switch over to macro settings, while shooting normal, I can't help. But I do advice to look in the manual on page 41 and put the camera in Auto focus. (Not one of the macro modes) then when shooting, wait till the camera has focused, while you pressed the shutter realise button half. When the camera is in focus, the square in the middle of the screen becomes green, press the button down. (without moving the camera)
Also select a high resolution (big photo size) because small photo size is easy seen as a blurred picture.

Success

Set would seem to be either in PIP (picture in picture multiple mode) or the black box might be the TEXT feature which is found in the closed caption menu.

yes,remove the back of the tv,on the power board you will see the problem.replace those capacitors on the power board.this will allow the set to work.the black bars may still be there.this is an indication of a bad panel.

It's your power supply. have it taken care of ASAP before damage happens on the board where it can't be repaired, just replaced, "if they can find one".

It turns out that the Closed Caption option was turned on somehow. When I turned that off the Black Square went a way and did not return.

Good Day, britt93;
It sounds like you have the TV's CLOSE CAPTION on; in the text mode, turn off and you and the TV will be fine.
Good Luck, big IRISH.

Good day, seanhanna;

Hitachi has LED’s, green ‘lights’ and a red light to determine what circuit may be the problem; after removing the back of TV, bottom only, plug TV back in and observe which LED’s come on …..BUT most important which LED’s don’t come on; locate and note number, EG; DP37 and etc.

Good luck, big IRISH. Ps let me know.

Good Day, peterferd;
Try resetting the TV by unplugging from A/C outlet wait 3 to 5 minutes then plug back in. No fix? Call service company.
Good Luck, big IRISH.

It sounds as though you have what is referred to as a climental problem. In laymen terms, a transistor, chip or regulator is heating up and breaking down. The way a technician normally isolates this type of problem is by using a cooling agent ( freeze spray ). When the set heats up and the picture goes away, the technician sprays some of the cooling agent on a part of the board ( select a small area, about 6 inches square ) at a time and see if the picture comes back on. When you do finally get to the bad area, the picture should come back on for a short period of time until the bad part heats up again. After a period of time and by using the freeze spray, a person can isolate the exact bad part. Replace that bad part, and any filter capacitors hooked to that bad part and the set should work properly. As always, use caution and unplug the set before opening the set and when using the freeze spray, be sure not to touch any connections in the tv as they could produce shocks.
I hope this has helped and good luck on your problem.
Ed
NC Electronic
Mills, Wyoming
Have a Great Presidents Day

if your big black square starts about the middle of the tv & goes down close to the bottom, you have closed caption text turned on. normal closed caption is small, but test caption, is just a big black box with no writing in it. go into your menu & shut it off, it could even be a button on your remote called, "caption", or "cc". good luck.