Question about Toshiba 28N33 28" TV
A couple of days ago I turned my set on and got no picture. Instead, just a flat horizontal line centered in middle of picture tube. No problem with sound. I have no service manual for this TV. So, I am hoping someone will direct me as to which component burned out? Thank you. GerryW
The vertical output IC is most likly bad or has a bad connection on it. Its a stand up IC witha metal heat sink and should start with an LA number. There ciould also be a problem with the B+ feed if you replace the IC and still get no vertical deflection. The parts would be in the sweep power supply and would start with the same first number thats printed on the printed circuit board, that is printed by the vertal sweep IC, meaning if the IC number on the board was IC412, then the B+ supply parts would start with 4 also ie r456, d456,c435 ect ect. The numbers I used are not the actuall numbers just used for referance. If you need a schematic one is available at http://www.servicemanuals.net for a download price of about 24 bucks. Remember though to always be safe and if you have no solid state repair experience, please consult a pro to assist you with this repair. Good Luck Please dont forget to rate this thread.
Posted on Oct 20, 2006
Gerry, A vetical timebase failure like this is not bad and should not take a Serviceman long to fix if he has the all important service sheet, or circuit diagram and an oscilloscope. It is worth looking in the back, if you can obtain some layout details, and with it switched on, use a long dowel rod to prod the part of the circuit, as it may just be a dry joint, or burnt resistor.
Posted on Oct 22, 2006
This is a very common problem with Toshiba CRT TV's. There are a couple of electroytic capacitors near the vertical deflection amplifier (VDA) which become leaky, then the VDA blows out. Replace the VDA and the electrolytic capacitors near it (sorry, don't have a schematic to tell you exactly which two); if you just replace the VDA without replacing the caps, the new VDA will justblow up in a matter of seconds-minutes.
Posted on Aug 12, 2008
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