Hello, After you remove the 2 little black screws, must use a 'minus' (-) screwdriver. This screwdriver must be pushed between the 2 semi parts (shell) of the remote body and gently rotate until they get apart little by little. Must do this around the remote control body.Success!
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Sounds like the circuit track inside the remote control [at its PCB]; had opened. An open circuit can cause this fault. In most cases, this fault can be repaired. Contact any service technician. The remote control has to be opened.
If you wish to buy its original remote control, contact the authorized service centre, or authorized dealer to your device brand. They can either give you a genuine remote control to your device, or can direct you, from where can you purchase a suitable one.
If you wish to get some details; check the site linked here. Viewing it in "Mosaic" or "Magazine" will make surf easy. Pull up older posts. Surf the site with patience. Do a search by type in the brand name of your device at its search box and press "Enter". http://electronicshelponline.blogspot.com/
As all other buttons works properly except Volum Dn, the problem is with the remote control itself. Clean the remote control and check. To clean it, you have to open the remote control. If it too doesn't help you, buy one original remote control from the authorized service center for Sony. No universal remote control will go properly with Sony TVs. If you wish to get some details, check the site linked here. Pull up older posts.
Try the above Sony web site, where they have support, or call a Sony Dealer.
I contacted sony support centre to ask for code for sony RM-VL600T remote control, this is their reply below
I'm sorry, but there are no codes for the ASTVD LCD TV DVD COMBO. However, in some rare cases, you may not be able to operate your non-Sony equipment with the supplied Remote Commander. This is because your equipment may use a code that is not provided with this Remote Commander. In this case, please use the equipment's own remote control unit.
Thank you for understanding.
The Sony Email Response Team C6EM Brian
i have since learned the problem is that acoustic soultions tv are made for argos stores and are branded with their own name, therefore the modle is not registered as a tv brand to be used with universal remotes.
I had the same problem with sony remot control RM-ED002, take remot control apart and clean inside with damp cloth and dry with kitchen towel, thats it now use it! ;-)
When i opened mine it was some kind of moisture under volume and channel buttons, cleaning and drying it helped.