Question about Sharp LC42SB45U 42 in. LCD TV
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
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
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
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
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
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:
Failed TV and Monitors pictures: http://s807.photobucket.com/albums/yy352/budm
Learn about bad caps: http://en.wikipedia.org/wiki/Capacitor_plague
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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