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The CT-90326 remote was included with several Toshiba televisions, including the 42HL800A. You can't directly scan for channels with a single button on the remote. First make sure that the TV is set to the TV input. (Use the Input button on the remote (top left) or the TV (lowest button on the left side as you face the screen).) Next press Menu (the second lowest button on the TV or the button at the lower left of the Left arrow button). Use the Left or Right arrows to select Setup (with the gear icon) and press OK. Use the Up/Down arrows to select Auto-Tuning and press OK. Use the Up/Down arrows to reach the line to select the type of channels to search for a signal. Then use the Left/Right arrows to select Digital channels, Analog channels or both. Go down another line to set the bandwidth of your broadcasts. Again use the Left/Right arrows to select the correct one. Go down one more line to Start Scan and press OK.
put on new batteries with correct polarities and try.
one more method is get a AM radio receiver and switch it on tune it to lowest frequency,and now bring your remote near it press one button after another,you should hear some noise when each button of remote is pressed if not open the remote clean all contacts with Iso-propyl(IP) alcohol with good surgical cotton.it has to work .
First switch on a radio receiver which has AM ( medium wave band)
and if the remote controls batteries are good then ,,
tune the MW / AM to lowest frequecy and then start pressing buttons of remote control one by one. for each button pressed you will hear a sharp sound and the button you don't hear a sound in the radio speakers is the faulty one.Then open remote control ( that is if you know how to ,you may have to open few screws and also pry open some plastic latches .Best to take help from one of your friend who had already opened some remote control .)
clean contacts of control pad of remote control with Iso- propyl alcohol.also called as IP.use sergical cotton which will be clean enough.claen also PCB with IP.after drying for few minutes assemble it.take care not to tear the rubber control pads and do to use sharp instruments to clean any parts of the remote .
The remote works once the right room temperature is sensed (66F) by the remote, This is a room temperature triggered remote.However, if the thermostat at the remote becomes defective, then there is no way that the remote will function. You have to do it manually.