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If you have the older TV with a CRT, here is my answer. By now this TV has a loose capacitor. The capacitor will not have any solder around the pin for a proper ground. Next, there may be a large power resistor that is not attached to the board as for the same reason as the capacitor mentioned. I have not repaired your TV model, but experience tells me what to do. You asked, so I'm sharing. These are just one of many grounds. You will need to solder the vertical IC, Horizontal transistor, horizontal transformer, flyback transformer etc. You will have to inspect the board for any and all solder grounds. Also, be sure to resolder the small board that is attatched to the CRT (pull this board off carefully and then solder). You should not have to purchase any parts, resoldering will bring it back to life.
remove power; remove the cover: with a multimeter on "ohms" check the fuses they will be identified on the circuit boards as: F-1, F-2 etc. look over the circuit board for burned resistors and, other components i.e. leaking "domed" capacitors, next: repower safely then: using component coolant from radioshack cool the i.c.'s as you stand behind the tv / monitor while watching the monitor using a mirror to see the monitor screen (do not touch the open monitor case.) if one i.c. suddenly makes the unit work: heat it with a hairdryer on "warm" to duplicate the failure before you replace the faulty component.
its telling you that you cant use the format that your source is set up for .. like 1080P wont play on a monitor that wont support that ..also hdmi requires an exchange of information between units before it will allow 1080 resolution (thats to prevent recording of high resolution material) the adapter may block that exchange .. if you set the source to 720 or less resolution then its likely to start working .. problem is .. if you cant see it how do you set it .. if your remote has an obvious button for that then you can just try selecting different modes and wait 10 seconds to see if it works .. if its not obvious then perhaps you can temporarily use svideo or composite in order to set up the source machine ..
I'm not real sure what year this set is. Most sets 5 years or newer have service menu adjustments. Unless someone went in and adjusted it to get it out of adjustment, adjusting is not going to do much good. I would be looking for bad capacitors in the vertical circuit or possibly the vertical output IC. These IC's tend to run pretty hot anyway so they are usually the problem along with leaky caps.
either your vertical output transistor/I.C. is out or possibly a coupling capacitor is bad,does it try to fill the screen if you tap on the cabinet, if so open up the back and using something like a drink straw prod and push on the board and see if you have just a "cold" solder joint
The LA78041 IC has failed. I replaced it twice before I cleaned the high voltage connection to the CRT. It was very cruddy from cigarette smoke. A high voltage discharge to the yoke takes out this IC. They are available for under $4.00 Good luck.
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If the IC is running hot, you probably have some bad caps in the circuit. Be sure to have a good capacitor checker that also tests for ESR. Also recheck your soldering work with a magnifying glass. The traces are so fine that it is easy to damage them.
Witch part of the screen you loose?if is the bottom or the top it could be a problem in the vertical IC circuit if is the left side or the right side is a problem on the horizontal deflection circuit(very rare),try taping on the set when it does it and see if the pix reacts ,if it does one way or the other you have loose conections and some resoldering need to be done.If you are familiar with tv circuitry you will have no problem.If you are not be safe and call for help.