My Toshiba 37av502u goes back to initial setup screen to choose language. All color settings go back to factory settings (50%). Turner defaults to cable, but retains the channels.

suspect you may have acquired a Japanese (-and-Korean-and-perhaps-Chinese) -language-only model.
But in any case, language changing is usually the first screen on initial setup. If you get a screen of language with two buttons, on the lower left and on the lower right, you probably should select the left-hand button, then select one of (possibly three) languages. English being prodominant, the left-most button of three would be one to choose, if you have a model that can be set to English at all.
The initial setup screen with language choices, will probably be what you get once you reset the device to factory settings.

Use Default Settings If you want to return the initial language setting such as Language, Video, Audio and etc. to the factory default, do the following: 1) Press SETUP button. 2) Press / button to select Misc. 3) Press button to select Use Default Settings, then press ENTER button. 4) Press / button to select "Yes", then press ENTER button. The original setting will be restored. Screen saver : On Do you want to use default setting? Note When you reset the DVD player to the factory default, the DVD player will take 3-5 seconds to reset.

As goofy as this might seem, a large accumulation of dust inside the TV chassis could be the culprit. The dust becomes conductive and drains the charge from the capacitor that keeps the memory "alive" while the set is powered off. I'm a 40+ year veteran TV technician, but I've specialized almost exclusively in antique (1940's to 1970's) all vacuum tube sets for the past 15 years. I can get a dead 1946 RCA 630TS 10" B/W TV (worth about $2,500 as an antique) working again with about 10 hours of bench time. My new roommate, a lady I've known since we were kids, brought a Toshiba 37AV502U with the same "loses its memory" symptom when she started renting my spare bedroom recently. I opened it up looking for a bulging electrolytic capacitor or a dead RTC battery like some computer motherboards. I didn't find any suspicious capacitors and the only batteries this set uses are the AAA cells in the remote. What I did find was A LOT of dust inside the set. Cleaned the dust out, put it back together, and the set is holding its memory now when powered off. Obviously, the dust was creating a shunt path that was bleeding the charge away from the capacitor that stores charge for the memory.

Incorrect language appears on the display

If the "Before you troubleshoot" checklist does not solve the problem, then try one or more of the following:

CHANGE THE LANGUAGE USING THE PRINTER MENUS

1 From the printer control panel, press .

2 Press the arrow buttons to scroll to Defaults, and then press .

3 Press the arrow buttons to scroll to Set Defaults, and then press .

4 Press the arrow buttons to scroll to Use Factory, and then press .

5 Complete the initial printer setup.

CHANGE THE LANGUAGE USING A BUTTON COMBINATION (IF YOU CANNOT READ THE CURRENT LANGUAGE)

1 Turn the printer off.

2 Press and hold down and , and then press to turn the printer on.

The printer resets and starts the initial printer setup.

3 Complete the initial printer setup.

Incorrect language appears on the display

If the "Before you troubleshoot" checklist does not solve the problem, then try one or more of the following:

CHANGE THE LANGUAGE USING THE PRINTER MENUS

1 From the printer control panel, press .

2 Press the arrow buttons to scroll to Defaults, and then press .

3 Press the arrow buttons to scroll to Set Defaults, and then press .

4 Press the arrow buttons to scroll to Use Factory, and then press .

5 Complete the initial printer setup.

CHANGE THE LANGUAGE USING A BUTTON COMBINATION (IF YOU CANNOT READ THE CURRENT LANGUAGE)

1 Turn the printer off.

2 Press and hold down and , and then press to turn the printer on.

The printer resets and starts the initial printer setup.

3 Complete the initial printer setup.
HANGE THE LANGUAGE USING THE PRINTER MENUS
1 From the printer control panel, press .
2 Press the arrow buttons to scroll to Defaults, and then press .
3 Press the arrow buttons to scroll to Set Defaults, and then press .
4 Press the arrow buttons to scroll to Use Factory, and then press .
5 Complete the initial printer setup.
CHANGE THE LANGUAGE USING A BUTTON COMBINATION (IF YOU CANNOT READ THE CURRENT LANGUAGE)
1 Turn the printer off.
2 Press and hold down and , and then press to turn the printer on.
The printer resets and starts the initial printer setup.
3 Complete the initial printer setup.
Printhead error

Restore Toshiba to Out of the Box Condition
If your model Toshiba laptop has a Restore partition on the hard drive then follow these steps to restore your Toshiba to the Out of the Box condition.
1. Press and hold the 0 (zero) key and at the same time, tap the power button once to switch on
your notebook.
2. When the machine Starts beeping; release the 0 key.
3. When prompted by the warning screen; select Yes to continue with the system recovery.
4. Select Recovery of Factory Default Software; click Next.
5. Select Recover to out-of-box state. 6. Click Next again.
7. Click Next to Start recovery.
8. Restart the Toshiba laptop when there restoration process finishes running. Follow the prompts that appear on the screen to set up the laptop's date, time and language settings.

If nothing else works, you may have to manually calibrate the dials inside the mirror box. This video link will show you how. http://youtu.be/R1DIko0a1MA
This may be necessary if the printer got bumped really hard.

Incorrect language appears on the display

These are possible solutions. Try one of the following:

Change the language selection during initial setup

After you select a language, Language appears again on the display. To change the selection:

1 Press or repeatedly until the language you want appears on the display.

2 Press to save.

Select a different language after initial setup

1 From the control panel, press or repeatedly to choose Setup.

2 Press .

3 Press or repeatedly to choose Change Printer Default Settings.

4 Press .

5 Press or repeatedly to choose Language.

6 Press .

7 Press or repeatedly until the language you want appears on the display.

8 Press to save and exit.
Note: If you cannot understand the language on the display, see "Resetting the printer to factory default settings" on page 57.

Manual:
http://images.lexmark.com/publications/pdfs/2007/4800/v4924668_en.pdf

Click on this link or copy and paste the complete link into your browser.

If I could be of further assistance, let me know. If this helps or solves the issue, please rate it and give a testimonial for my response.

Thanks, Joe




I’m happy to assist further over the phone at https://www.6ya.com/expert/joe_8b8c2cd6ce148309

If you mean factory defaults, you do this through the BIOS setup.
During the initial boot, a message should flash on the screen telling you which F key to push to enter Setup.
This is, on most systems, F1 or F2.

The text menu normally shows a selection called Factory Defaults or Auto Setup or similar language.

Use the Setup menu to select English or Spanish as
the language for the menus and on-screen displays.
Adjust Color Balance Automatically or manually
(PerfectColor TM) using six colors, Magenta, Red, Yellow,
Green, Cyan and Blue. Reset the Color Balance to the
factory default settings. Align the focus (convergence)
of the TV's projected light beams or reset the focus to
the factory default settings.