Okay, resoldered many connections and checked the fusible resistor by the vert out. Now, there is NO intermittent white line across the screen...Fuse by the FBT still blows....static felt on the TV screen, but that's it. Have we narrowed it down to the FBT or sound like another component?
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Re: Still no picture, but there is sound
If you are getting static on screen you dont necessarily rule out the FBT, but if there is a fusible resistor by the FBT that is blowing it may be supplying current to the vert IC, the IC may be shorted internally or externally, check your connections and try replacing IC. Also check the pump up cap and if it is powered off the FBT the rectifier diode.
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you have the problem in the heater try to resolder the parts in the crt socket the one that is connected in your picture tube if nothing happens check the resistor if open replace it common value is 5.6ohms.
that is a vertical deflection circuit problem. try to check a 470 UF capacitor connected to the vert. yoke coil if it is open or try resoldering the nconnecrtion at the board. if not, try to replace the B+ filter of the vertical amplifier. another is try to chexk if the vertical moscillator is qworking if you know elecrtonics.
the picture is produced by the following,
check the power supply, making sure that a high voltage is produced of about 90-110 volts, which later triggers a line transformer to oscilate.
a power supply is suppose to be checked expecialy semi conductors and diodes, also fusible resistors be checked make sure that the switch is okay power is passing through it.
sounds like you have more problems than just the fuse.. did you resolder the connection when you replaced the fuse. this is what causes that to happen.. fuses blown for a reason. ussally something is shorted. that particular fuse blows because it is a very small fuse and doesent take spikes in power to well. so when a intermittant connection begins to cause ossillations it shakes that poor fuse. it however sounds like you have more than that. does the led on the front flash when it shuts down.
completely resolder the virtical circuit, including the vert. ic.
i have also at times found an open resistor near the flyback that provides b+ to the vert. ic. if you can find a pinout if the ic, find the b+ pin & trace it back to the fluyback.
you have a vert sweep colapse. Fisrt thing is to get a schematic diagram and find the vert. output Ic and the clamper diode. Measure the voltage on both sides. If its low then its apossibility that the Ic was drawing loads of current and blew out the b+ feed resistor. Look on the schematic and trace back the voltage line from the vert output ic back to the sweep power supply on the secondary of the flyback transformer. check the limiter resistor to the feed and if its open replace the cap right there the resistor as well as the vertical output Ic ALL AT ONCE!!! If you dont you will cause it to go out again in a short time. Good Luck.. If you post the vert part of the schematic I will be more then happy to assist you with this repair.
Defective components in vertical deflection and output circuit inclusive of vertical output device, coupling capacitors, and yoke connectors. Passive devices such as electrolytic capacitors, coils, and resistors to/from power supply circuits. If your tele is more than 10 years old dump it and get a newer product. $100 USD is a fair price to diagnose and attempt service, depending on age and configuration. Older products may not have replacment
parts available at any repair cost.
There may be a pot for adjusting the vertical size. If so, it may be dirty. If you can find it, try adjusting it which could clean it. BE CAREFUL -voltages are very high.