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just read the model and then google it, beside, if you short them, you need to replace them with same value, and this will be determined by the circuit, if you did not change the circuit - just buy two new diodes and install them, do not bother with voltages as they have some tolerance and type will determine it.
Check for any short circuited component/s, or any shorted zener diode/s at the related circuit parts; before replacing a new IC. Check for any winding short at the vertical output section of the deflection yoke [a very rare case indeed] too. If you wish to get some details; check the site linked here. Viewing it in "Mosaic" will make surf easy. Surf the site with patience. Pull up older posts. http://electronicshelponline.blogspot.com/
Check the input fuse first. If it is blown, there will be some short inside the power regulator circuit. Usually Sony sets uses STR regulated power supply. You can see this STR, and Ic, screwed onto a heatsink. Replace it with a same type and number. Before replacing the STR, check the diodes used in that section for damage, mainlu zener diodes. They might get shorted along the blowing of the STR. Check that section throughly before resoldering the new STR.
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That is probably the power section about to fail. The burning smell is going to be from overheating components. You will have to take it into either an akai repair depot or a local tv repair and have it looked at. Get an estimate first. The repair cost on this could be cheap if itis obvious and the repair gys are on the ball or it can be pricey if they just replace major parts (typical). Also have a good idea of what replacement cost is so you know if it is worth fixing.
The issue here is that the zeners in question are merely like a safety fuse and replacing them before identifying and fixing the cause of the problem will only cause your replacement zeners to blow aswell.... personally if it is a true plasma it likely chews through alot of power anyway so I would take the opertunity to replace the TV with a newer much less power hungry led TV and in doing so save the hip pocket and the environment.
Since it is 5 years old mostly dry soldered appears. First sort out the soldered problem. Then check zener diode in video input path is short. Mostly the diode is short. Still get problem check video switching ic also. I think former is the most problem.
You probably have one or two diodes bad which would have to be unsoldered to replace. Since it is a small TV, it may not be worthwhile to take it to a repair shop -- if you can find a good electronics tech with soldering equipment and a multimeter, have them check out D951 a 12 volt zener diode near the power relay. If good, then I would check out D941 and D942 in the power supply. If all three diodes are bad, the set probably took a power surge or lightening strike and could have other shorted components as well.