A technician looked at my TV and found out that the part number: 23217406 Transformer, Converter [T862] is the one which is damaged, so I am sure that is the piece is not working and the one I need to replace

Televisions don't normally 'turn'.
Please explain.

may due to power variation the transformer is got damaged or power supply wire has got damaged ....
or
may be transformer has got heated fully and it is out...
or
may be the tube is gone....
or may be due to power variation the short circuit might have been occurred and the circuit board has got cracked....

solution : visit the tv technician and discuss problem....

You have not specified the condition of audio with your TV. If audio [sound] is present, and no picture is the fault, the horizontal output section circuit should be trouble shooed. In most cased, this type of fault can occur if the LOT {line Output Transformer} has damaged. It will be best to contact any experienced service technician to confirm the fault. It will look like this.

ShopJimmy likely has the power supply board with the best price, otherwise discount-merchant.com.

However I have one the I am currently looking at where the power supply board was the original issue, and after going over it throughly, the real problem was numerous bad solder joints from the factory. The silver solder is deceptive at times because a joint may look good or passable, but is actually faulty. More often what is seen is called " cold solder joints" where the solder crystalized upon cooling.

Unless the transformer is actually visibly scorched, the transformer may just be suffering from bad solder joints on the PC board, or even on the wires where they attach on the header leads. (This by the way was the main problem on early Macintosh computers having a bad solder joint where the winding attached to the header lead, so this is nothing new)

It does lead to an ugly repair in some cases, but once corrected, it is no longer something to worry about.

If there happens to be a drilled circuit trace- that is probably a factory revision. Try it "as-is" and see if it comes to life.

It's probably a write-off. The circuit board inside has been cracked so that some of the copper traces that connect parts have broken. This commonly happens around the area of the horizontal output transformer, which is heavy. The shock of the fall causes the transformer to bounce and breaks the board. Other areas too may have been damaged because of flexing. And worst, the picture tube can be damaged in a fall, so it either doesn't work at all or shows permanently distorted colors.

It's tough to find anyone willing to repair a set that's fallen. Many circuit board tracks are very narrow and hard to repair. Then it's difficult to know if all the damage has been found and repaired, so even if the set starts working a technician doesn't know if something else won't go wrong. And then there's that bad tube possibility; no technician likes to spend lots of time fixing a broken board only to find the set then needs a new tube. Trust me, this has happened to me several times during my career in TV shops.

Your best bet is to use this as an excuse to buy a new LCD or plasma TV. 40-inch models, a good size match for a 32-inch CRT (tube) model, are reasonably priced.

First, you'll want to make sure that her antenna has a coaxial cable (one of the thick round ones) coming from the antenna. Some older ones have a flat piece of plastic with two wires sticking out. These are less efficient, but if you have one, use a balun (a vhf-uhf matching transformer) to change to coax. You can google "balun" if you don't know what one looks like. Next, you'll need a digital converter box (if you don't have one already). Connect one end of the coax cable to the antenna (or balun) and the other to the jack on the converter box labeled "ant. in." Finally, using another coax cable, connect one end to the jack on the converter box labeled "to tv" and the other end to the jack on the TV labeled "ant. in." Finally, depending on your converter box, you will probably need to "scan " for tv channels. Follow the setup instructions with the converter box to do this. If you don't have the instructions, try googling the converter box company and model number to find the users manual. I hope this helps, and good luck! Sincerely, Der Strom

Then I would say your lamp needs replacing.

replace the power pcb in the tv.

yes you have to test voltage but you must plug it in and check the power supply board first, the most common problem for those things is the 24 volt transformer in the power board fails check it for 24 volt output first, then trace the power route from there and the component that the board traces lead you to that dont transfer power through it will most likely be the problem but start at your power suopply and work outward from there. mine the 24 volt converter or transformer blew. i have been looking for one for 4 months. there is a eeprom in the main video board that blows also its easily found, it turns the unit on from the standby switch. check it also with a volt meter. you cant miss it on the board.

The two symptoms are related and are associated with the high voltage transformer,since the problem developed overnight is going to the help of a qualified technician to diagnose the cause,if you are familiar with tv service look at the horizontal output transformer for signs of damage but be careful,there are dangerous voltages present.Or be safe and call for help.