If it is its original remote control, there should not be a problem like this; as all the other buttons works properly. If it a universal remote control, some buttons on it might not work properly. The only thing to check is, try with an other set-up codes to Sony brand TV, with the universal remote control.
If you wish to buy its original remote control, contact the authorized service centre, or authorized dealer to your device brand.
To select a proper universal remote control, you should know about the number of digits to its set-up codes. There are 3 digit, 4 digit, 5 digit, 2 digit and even single digit codes, to some brand devices. After confirming this, check the sites linked here. Both the sites have set-up code list and set-up procedure to many popular brand remote controls. Check which brand remote control has set-up code/s to your device brand, and buy that one according to availability? Brand name of the remote control isn't a matter, but it should have set-up codes in its code list, to the device you have.
Please note: Every new universal remote control will have set-up code list, and set-up procedure along with its user manual. Never accept a remote control, that hasn't both of this. If you see the site by "MOSAIC
" or "Magazine
" view, will make surf easier.
Universal remote controls are available at most of the electronic spare part selling shops.
Check this link too. http://remotesearch.blogspot.com/