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Re: orion TV 1934
You might try substituting a new fuse. Be sure the replacement has the same rating.
You may have a short in your power supply and depending on the type of supply the supply may not start up if it has overload protection.
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It is usually located near the power supply section. unplug the TV, open the back of the TV and look for a small glass cylinder with two metallic ends. This will be the fuse, now to check it do a visual inspection and you should see a clear cylinder with no internal dark smuges (good) has smudges (bad). Then if you have an ohmmeter set it to the 1xR setting and measure the fuse ends it should read 0 ohms if the fuse is good and no reading if the fuse is bad.
Turn the set on, hook the cable directly to the TV, take the remote control and press 1 - 1 and if the TV tunes in channel 11 then your set is fine. If the TV was autoprogrammed when hooked to a cable box then the only channels that will be stored in memory are 3, maybe 4 and AUX. To correct this simply go back into the menu and look for the "autoprogram" option and perform the autoprogram while the cable is directly connected to the TV, without a cable box.
If you know how to use the multimeter is to get a service manual. Try http://www.servicemanuals.net Then troubleshoot the power supply and the sweep supplys. In most cases if you had to replace a complete board,unless you get it from an exchange company that repairs boards such as http://www.ptscorp.com, then it exceeds the cost of a new set. Good Luck