If the tv works and its just the sattelite portion of the tv that doesn't work you can alway just use a new sattelite box and connect it to the tv via the rear inputs on the tv and then just select the coresponding input to view the sattelite chanels.
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Your tv is tuning locked. Go to menu and get the tuning lock function by pressing PR+,PR- keys. Reach to the tuning menu by the help of Vol+, Vol- keys. Select the tuning lock fumction, and turn it to 'off' .
I have done some research and found a notorious cap and diode problem with this set. The two 4700uf caps (C14113 and C14115) on the DM1 power board (the board to the left of the sat. box when you look at the set from the back) are under rated and will eventually fail. When these caps fail they tend to take out diode CR14105. This may be your problem. If it is, you can replace the caps with 4700uf 25V 105c and the same as original diode.
using your Dish Network box connect the audio and video outputs to the tv via the RCA inputs1, 2, 3, or component inputs on the tv and then select the coresponding video input to view your cable. Or you can connect your Sattelite to the antenna A or B input jack on the back of the set and set the tv input to antenna
using your cable box connect the audio and video outputs to the tv via the RCA inputs1, 2, 3, or component inputs on the tv and then select the coresponding video input to view your cable. If you do not have a cable box you can connect your cable to the antenna A or B input jack on the back of the set and set the tv input to antenna
It seems that the number provided "CR14710" is the number near the part on the board. Are you sure this is the part number or rather, is it the part's schematic reference? I interpret "CR14710" as Control Rectifier 14710 that can be found on a schematic. I say this because you also said "a badly burned diode" and usually the part number becomes illegible from this.
My set just recently went throgh the same problem. I found a bad connection on the power board and a burned diode as well. I repaired the conneciton but have had no luck getting the specs on the burned diode. RCA has been no help.
As for cost of repair, on serviceman quoted $50 just to come take a look.
Press menu on the remote. Press the cursor up or down button untill the word CC is highlighted. Press the cursor right button to select Closed Caption 1. You will likely have to do this with the original remote. A universal remote may not allow you to do this.