Question about Sharp LC42SB45U 42 in. LCD TV

1 Answer

Input menu keeps popping up and switching inputs

When I have the tv on the input menu shows up covering almost half the screen, when I press the input button it moves mutiple times, once I get it on the correct input, the menu doesn't go away. Then as soon as I touch any button, it changes the input

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  • Sharp Master
  • 14,553 Answers

The most likely thing is one of the switches under the control buttons ON THE SET is bad---see my stock explanation:

Keyboard issues and answers: A problem that is more common than most people think is an issue with buttons on the control keyboards of modern TV sets. Recently for whatever reason I have seen more questions about this so I have composed this answer and solution for these kinds of problems. It can be any button on the set-channel up/down or volume up down-you name it. The symptoms are the same: channel will scan up or down and will not stop-remote control has no effect on this---It can be channel, volume, or even input or menu if the set has those up front or on the side of the set. All these push controls have something in common-beneath each is a tiny momentary push switch-when pushed with the plastic button it performs a specific task (vol up or down etc.). What happens is the afflicted switch beneath the plastic button is bad-when released it is supposed to stop its function but does not. Keyboard or button controlled features have PRIORITY over the remote control, hence the remote will not stop this from happening. Both the remote and the keyboard go to the microprocessor in the se t but the keyboard is first in line. How to resolve this issue? Someone needs to get at the tiny pc board with the buttons and locate the one associated with the issue (ie sound or channel etc) and unsolder that switch from the board-usually just two pins (may be more for mounting only purposes) and then see if set does not have the issue with switch out of the circuit. For the TECH minded with the board out test here the switches with a ohm meter set to high resistance-any reading with button not pressed means a bad switch-seen ones that read 5,000 plus ohms-it may be necessary to unsolder more than one switch to locate the offender here but an open reading with switch not pressed is the rule. I have taken the time to compose this answer as some do not understand what is happening in these types of situations---No magic wand or smoke and mirrors here-have to disable the offending switch to know. The beauty (in my view) of this kind of problem is if found, you really do not have to replace any part-just operate the set with the remote with one button that no longer functions on the set itself-who could ask for more? SD TECH

Posted on Oct 26, 2012

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Posted on Jan 02, 2017

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SOURCE: Remote's menu and input buttons, and television Input button not responding

well the problem sounds like it could be the IR sensor on the tv or somthing in that circut that is failing or the EPROM chip that controls : Vol up/down , Channel up/down , Power on/off ,Menu , Input selection , ect... is failing, thus this will trigger the protection circut to shut the tv down. this kind of a problem only gets worse and can dammage other components if not repaired soon so it will need testing to determine the exact cause

Posted on Oct 14, 2008

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SOURCE: 52 INCH sharp aquos lcd REMOTE NOT WORKING

Make sure your remote lock is set to off.

Posted on Apr 22, 2009

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SOURCE: I cannot watch cable TV on Input 1 when Input 2 is activated.

Tries to reset the tv Tuner board back to factory setting.By go into the tv menu.Go to PICTURE,go down to reset the Tuner board.All the HDMI ports should work now.Not,than the HDMI port 2 is shorted and dead,don't used the HDMI port 2.The tv should work fine,or tries websites like Shopjimmy.com,Ebay.com to buy a refurbish Tuner board for the replacement.

Posted on Jun 16, 2010

  • 98 Answers

SOURCE: A black screen that covers the lower half of the

I had this problem as well. Check your closed caption settings in the menus. They are probably turned on with no captioning available on the program. Turn them to the off setting.

Posted on Feb 11, 2011

budmrtn
  • 11361 Answers

SOURCE: When I press the input button, nothing shows and

So you are getting sound but no pictures, no on screen menu?
It will require in-depth troubleshooting, please read on if you are going to DIY repair:
First, look at the screen in darkened room to see if you can see any slight glow from the screen, if it does, then the problem can be the T-CON (not getting the 12vdc) or the main logic board not feeding the signals to the T-CON board.
if not, next place to check will be the power supply module, make sure it has 24vdc which is required by the backlight inverter to work, the reason for not having 24vdc can be from bad DC filter caps (leaking/bulging top, high ESR) or short circuits in the inverter board which will cause the 24vdc supply to go into shutdown mode, so you may have to disconnect the power cable that feed the inverter board to see if the 24vdc will work without the inverter board hookup, you will need to apply about 3~4 amp of load to the 24vdc to make sure it can handle that. There are fuses on the backlight inverter boards also. So there is some troubleshooting you will have to do to find out the causes of the problem you are having.

If you are going to DIY and have proper tools, electronics knowledge, and know safety precaution then please read on:
Basic LCD monitor and TV troubleshooting guide:
http://www.fixya.com/support/r5093881-lcd_flat_panel_tv_troubleshooting_guide
http://www.fixya.com/support/r6150077-basic_lcd_monitors_troubleshooting
http://www.fixya.com/support/r7406380-tv_training_manuals
Failed TV and Monitors pictures: http://s807.photobucket.com/albums/yy352/budm
Learn about bad caps: http://en.wikipedia.org/wiki/Capacitor_plague
Parts: www.shopjimmy.com
Parts: www.interliquidparts.com
Capacitors kit: http://lcdalternatives.auctivacommerce.com/Default.aspx he can make you a set of caps.
Or www.digikey.com, just make sure to use caps with low ESR, 105c, high ripple current and long life rating such as PANASONIC FM or FC series.

Posted on Sep 29, 2011

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Still won't work


Hi again,

This forum has much info re Mitsubishi PTVs. Nonetheless, an excerpt from there....
1.Set the Layer Switch at the top of the Mitsubishi Remote to TV.

2.Press and hold the POWER button, and while holding the power button enter 090.

3.Now the remote should function like this:

Power = Power On Discreet
Stop = Power Off Discreet
Pause = AV Reset

Pressing INPUT followed by:
PIP = DTV
1 = Input 1
2 = Input 2
3 = Input 3
4 = Input 4
5 = DVD / Component 1
6 = Component 2
SQV = Input STB
QV = Input VGA
PIP CH Up = Antenna A
PIP CH Down = Antenna B

4.When done, press and hold the POWER button and enter code 000 to return to the standard remote functions

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I found this online somewhere and it cleared my problem.

(my problem was a blue screen that said my input was locked enter in your code using the 10 key pad. Both inputs were locked, I used the steps below and it cleared it. We are now watching a dvd for the first time in months!) Thank you Bob Waterman whoever you are!)


MITSUBISHI CS3114R

Parental Lock



This system can lock each channel or different channels on ANT A and ANT B
as well as locking each of the EXT inputs, so you should confirm what is
locked before trying to unlock.

1 On the remote, set the TV/VCR switch to the TV position
Or . Depending on which remote is being used
Press the TV mode button at the top.

2. Turn on the TV and using the SCAN buttons (or 10 KEY FAD) and the INPUT
buttons check each channel and input to establish which channels and inputs
are locked. The screen will tell you if the channel or input is locked.

3. Press the button labeled MENU. The screen will show the main TV menu.

4. Press the #5 button (channel lock option).
The screen will change to show the channel lock System Menu. This screen
will indicate that the lock system is either ON or OFF.

IF THE SCREEN INDICATES LOCK IS ON, GO TO STEP 5
OR:
IF THE SCREEN INDICATES THE LOCK IS OFF, GO TO STEP 5A

5. Press the #3 button. (SELECT CHANNELS TO LOCK option). The screen will
ask for the code number. Press the #9 and QV buttons at the same time.

Notes: The screen will change to show an information display that will show
the selected antenna and channel or input. The display is superimposed over
the picture. This display will indicate that the channel or input is either
locked or unlocked. In the lower middle will be instructions to use the
10-key pad or SCAN buttons to select the desired channels (or the INPUT
button to change antennas or select the EXT inputs). At the bottom of the
screen will be instructions on how to change the current LOCK status (if
unlocked use the ENTER button to lock, or if locked use the CANCEL button to
unlock).

NOW GO TO STEP #6.

5a. Press the #1 button (channel lock ON option). The screen will ask for a
code number. Use the 10-KEY PAD to enter a new code number (We suggest 1111)
and then press the ENTER button.

Notes: The screen will change to show an information display that will show
the selected antenna and channel or input. The display is superimposed over
the picture. This display will indicate that the channel or input is either
locked or unlocked. In the lower middle will be instructions to use the
10-key pad or SCAN buttons to select the desired channels (or the INPUT
button to change antennas or select the EXT inputs). At the bottom of the
screen will be instructions on how to change the current LOCK status (if
unlocked use the ENTER button to lock, or if locked use the CANCEL button to
unlock).

NOW GO TO STEP #6.

6. Use the 10 KEY PAD or SCAN buttons to select the channels that are
locked, or, use the INPUT button to select the external inputs that are
locked.

7. At each locked channel or input press the CANCEL button.
The screen will indicate that the channel or input is either locked or
unlocked.

8. When all of the channels and/or inputs are unlocked, press the MENU
button again. TV main menu will be displayed.

9. Press the #5 button (CHANNEL LOCK option).

10. Press the #2 button (channel lock OFF option). The screen will now ask
for a code number again.

11. Press the #9 and QV buttons at the same time. The screen will return
to the CHANNEL LOCK MENU and indicate that the lock is OFF

12. Press the MENU button twice to return to normal viewing.

The parental lock is now entirely cancelled.

---------------------------------------------------------------

Bob Waterman, CET® #RI-28
Master Technician License #9109
Service Manager / Parts Manager
Gemini Computer, TV, & Security Alarms
(508)695-7302
(508)695-7769 FAX
geminitv@xxxxxxxxxxxxxxxx
geminitv@xxxxxxx
www.geminicomputertvsecurityalarms.com

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Without the code, you must get an original remote and press the "QV" and the "9" buttons together to unlock the TV.

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