Unwanted pop-ups The "Main Channel Display" appears frequently without any action from the user. The display will appear to swithch between "MONO" and "STEREO" and then disappear, as if the system was searching for a sound source. The appearance of the display does not appear to follow any pattern. It will appear sereral times during some programs/channels and other times will not appear at all. The only information from the Troubleshooting Guide talks about the Caption option and I have already made that adjustment.

I am unable to see at a glance how to correct this but it is between its menu, channel and volume buttons to alter the settings it may be worth to run through the re-tune sequence below?


To preset a channel or to change a preset channel, follow the procedure below.
1) Press the POWER button to turn on the TV.
2) Press the MENU button so that the menu display appears
on the TV screen.
3) Press the CH(annel) ? or ? button to point to "CHANNEL SET".
Then, press the VOL(ume) ? button.
4) Press the CH(annel) ? or ? button to point to "AUTO PRESET CH".
Then, press the VOL(ume) ? button.
The tuner scans and memorizes all active channels in your area.
? The TV distinguishes between standard TV channels and cable channels.
? When AUTO PRESET CH action is completed, the lowest memorized channel reappears on the
screen.
? When you press the CH(annel) ? or ? button after selecting "AUTO PRESET CH", the tuner
will stop at the memorized channels only.
? The TV may recognize TV channels to be CATV channels by the receiving conditions. In this
case, try AUTO PRESET CH action again in the fine receiving conditions.
? When AUTO PRESET CH is activated where there is no TV signal input,"NO TV SIGNALS"
will appear on the display after the completion of channel scanning.
[ADD/DELETE FUNCTION]
1) Press the MENU button so that the menu display appears on the TV screen.
2) Press the CH(annel) ? or ? button to point to "CHANNEL SET".
Then, press the VOL(ume) ? button.
3) Press the VOL(ume) ? button so that "ADD/DELETE" is selected.
4) Use the CH(annel) ? or ? button to select the
channel you wish to put into memory or to erase from memory.
Note: The menu will disappear in about 10 seconds.
Perform "ADD/DELETE" function while this display appears on the
screen.
? Press the VOL(ume) ? or ? button to light up the channel number
in LIGHT BLUE if you wish to add the channel into memory.
? Press the VOL(ume) ? or ? button to light up the channel number
in LIGHT RED if you wish to erase the channel from memory.
5) Press the MENU button to exit the menu.

Hope this helps.

A. Press the {User Tools/Counter} key.
The User Tools main menu appears.
Note
? When the key operator code is set, the key operator code input
display appears when changing the default settings. Enter the
registered key operator code beforehand.
For key operator codes , see "Key Operator Tools", General Settings Guide.
B. Press [Copier/Document Server Features].
The Copier/Document Server Features menu appears.
C. Select the menu you want to set.
The setting display for each menu appears.
Reference p.83 "User Tools Menu (Copier/Document Server Features)"
D. Change settings by following the instructions on the display panel,
and then press [OK].

Exiting User Tools
A. After changing default settings, press [Exit] on the User Tools main menu.
Changes to User Tools are complete, and the machine is ready to copy.
Note
? You can also exit User Tools by
pressing the {User Tools/Counter}
key

OK... from the schematics it appears that when in mon1/mono mode you use ONLY the MON1 gain controls, including the channel MON1's and the MON1 slider. Make sure you have each of those turned up as needed. In this mode, MON2,s and the MON2 slider are unused. The MONO slider controls the MAIN output.

on every channel ? then av board is failing
on a single channel then it is their signal not you set

Is it LCD or regular CRT Tube type?

Try a hard reset: Unplug from power source, disconnect from PC and wait for 10 minutes. Reconnect everything and see if the issue is resolved.
If not, then you either have a loose contact on the menu button or failing circuitry. I'd recommend calling Sharp tech support in this case..

Mine does this all the time. It appears to be a factory flaw. The only way around it is to set the channel you are watching to "MONO" and the crackling sound will disappear.

Hi,
The tv wont turn on ... the gren power display keeps blinking and won't turn on...
What can I do? Thank-You! KarL

Are you using a cable box sush as a Comcast cable box? If so then the volume control within the cable box is most likely not high enough for the TV to detect a stereo pilot signal. The Comcast remote (if thats what you have) still is programmed to operate the volume within thier box, the volume display will be at the top of the picture and it will be in white. Turn it up until the word "stereo" appears. then leave it at that setting and use your TV's volume control only.

did this fix it?