Remote control for teac set top box HDB842 will not work .

It can't be done, you have 2 choices. But a genuine TEAC remote or a get a set top box

Set-up (Programming) procedure is too much to type in here, and is not practical and it will differ brand-to-brand remote controls. If you wish to get more; check the sites linked here. It has set-up code list & set-up procedure to many popular brand remote controls. The site has general set-up codes to check with TVs and other devices are given, in the order of the 'device's brand name list' in alphabetical order. Set-up code list to many brand remote controls also is given. Pull up older posts. Search the sites by type in the brand name to your device in its search box at the top right part of the display window. It will help you to find the document easily.
http://remotesearch.blogspot.com/
http://electronicshelponline.blogspot.com/
http://electrohelponline.blogspot.com/
Programming Notes
• If your device does not respond to the remote after trying all codes listed or your brand is not listed in the code list, use the Auto Code Search method to program your remote.
• Sometimes the first code that "works" with your device may operate only a few functions of your device. There may be another code in the code list that performs more functions. Try other codes from the code list for more functionality.
This is a trial and error procedure; and quiet time consuming. You might have to check different codes said for your device.
Search the site by type in the "brand name" to your device; in the "Search box at the top right of the display window" to get gathered related posts.

Set-up (Programming) procedure is too much to type in here, and is not practical and it will differ brand-to-brand remote controls. If you wish to get more; check the sites linked here. It has set-up code list & set-up procedure to many popular brand remote controls. One among it has general set-up codes to check with TVs and other devices are given, in the order of the 'device's brand name list' in alphabetical order. Pull up older posts. Search the sites by type in the brand name to your device in its search box at the top right part of the display window. It will help you to find the document easily.
http://remotesearch.blogspot.com/
http://electro-medical.blogspot.com/
http://electronicshelponline.blogspot.com/
http://electrohelponline.blogspot.com/
Search the site by type in the brand name of your device, in the "Search box at the top right of the Home page display" to see the set-up codes to your device, with different brand remote controls.
Programming Notes
• If your device does not respond to the remote after trying all codes listed or your brand is not listed in the code list, use the Auto Code Search method to program your remote.
• Sometimes the first code that "works" with your device may operate only a few functions of your device. There may be another code in the code list that performs more functions. Try other codes from the code list for more functionality.
This is a trial and error procedure; and quiet time consuming. You might have to check different codes said for your device.

That is a common fault with that unit.
You will need to buy a new set top box as the cost of repair makes repair uneconomic.

Set-up (Programming) procedure is too much to type in here, and is not practical and it will differ brand-to-brand remote controls. If you wish to get more; check the sites linked here. It has set-up code list & set-up procedure to many popular brand remote controls. One among it has general set-up codes to check with TVs and other devices are given, in the order of the 'device's brand name list' in alphabetical order. Pull up older posts. Search the sites by type in the brand name to your device in its search box at the top right part of the display window. It will help you to find the document easily.
http://remotesearch.blogspot.com/
http://electronicshelponline.blogspot.com/
http://electrohelponline.blogspot.com/
Search the site by type in the brand name of your device, in the "Search box at the top right of the Home page display" to see the set-up codes to your device, with different brand remote controls.

2819,2883. Check these codes. If you wish to get more details; check the sites linked here. It has set-up code list & set-up procedure to many popular brand remote controls. Common set-up codes to check with TVs and other devices are given, in the order of the "device's brand name" in alphabetical order. Pull up older posts. Surf the site with patience. Surf the sites by type in the brand name to your set, in its search box.
http://electronicshelponline.blogspot.com/
http://remotesearch.blogspot.com/
http://electro-medical.blogspot.com/
http://electrohelponline.blogspot.com/

0289,0284.
Try these codes. If you wish to get more details; check the sites linked here. It has set-up code list & set-up procedure to many popular brand remote controls. Common codes to check devices with different brand TVs are given, in the order of the device's brand name list in alphabetical order. Pull up older posts. Surf the site with patience.
http://remotesearch.blogspot.com/
http://electrohelponline.blogspot.com/

Not sure if you've decided to throw your remote control away already or not. But try using the manual search code. Basically press "TV" (light blinks once), then press the "Up" channel button and the "up" volume button at the same time (light comes on permanently), then hold down "Power" whilst putting the remote RIGHT IN FRONT of the place where your tv receives signal (usually where you can see a light), and I mean right in front! Hold it down until your tv powers off. Then it should be configured and working. It took me about 1 minute or more for the TV to react and turn off. Then you can check if it turns on again and if the channels are working.

yo, try this, i just bought the same STB and had the same problem. So far this has fixed it (fingers crossed).

http://www.teac.com.au/pages/hdb842softwareupgradever161008

cheers
Chris