i was taking apart a toshiba 42h82 to part out and i put the crt in a box and when i moved the box i hit the wall and cracked the board on the complete red crt assembly...its a small board that is on the end of glass neck of the crt assembly.....
my question is that is this board repalceable or does this mean the entire red crt tube is trash........can i still part out the red crt in any way without the board
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It is probably a defective ballast board or a faulty PSU. The ballast is the high voltage power board connected to the lamp.The PSU is the board that supplies power in different voltages to the other internal parts. One of the DC lines from PSU goes straight to the ballast. The repair is done testing the voltage from PSU to ballast. The job must be done by a technician.
that silver box is called TV tuner (see picture ) ............ but in your case that is not the problem ......... after 4 or 5 yrs (depending on usuage ) in some TVs on mainboard & CRT tube's circuit board at some soldering joints cracks develops ... then due to loose contact TV behaves as you have described ........ when you are hitting that lightly on its side then these cracks at soldering joints are getting connected temporarly & for few seconds or minutes you are getting normal picture ....... so solution is most of the soldering joints on mainboard & on CRT circuit board has to be resoldered ....... only good tv service engineer can do this without shorting joints or damaging components..... so that silver box ( TV tuner ) is not the problem because when it gets deffective then you will get picture that comes when tv is switched on ---- usually it will be blue screen ......& also if you connect dvd you will get picture normally ...only thing is that you won't get picture from cable or antenna ..............
ur tvs crt sockets have some problem. change the three crt sockets at the same time . also check for screen voltages of crt's. increase it slightly. there will be three independent screen voltage adjustments for each gun.
If the picture is all green and does not shutdown then is probably not the tube and you need to check the green output transistor witch is ussually located in the crt board in the neck of the green tube,you also have an IC that gives the colors then you have a driver and finally the output,(IC and driver rarely go bad but is possible),when you pull the board out of the tube make sure it comes out easy,do not twist the board because it might brake the pins in the tube(gun) and then we will have big problems, many times they secure the board to the tube with silicone and it needs to be removed or cut before the board will come out.Each gun has an output and the defective one should be replaced with an exact replacement.Check also the conections in the green crt board.Let us know if you need more information.