Flyback KPT6AW4SSF not working losing voltage.

Hi. It seems that the g2 voltage of the picture tube is too high, resulting in a white screen, often with white horizontal lines. The g2 (= second grid) voltage is derived from the flyback high voltage. The voltage divider is mostly integrated in the flyback trafo housing.(including the adjustment knobs). A failure in this divider may lead to this defect. The static you hear may come from sparking in the divider. The flyback trafo is soldered onto the main printed cirrcuit board. Sometimes, one of the pins sits loose in the soldering pads.
Turn on the set and observe for any sparking around the entire flyback circuitry, and, or the flyback trafo itself
The screen turns black after a while, as a too high beamcurrent is detected. The set disables the flyback. Stand-by blinks meaning that there is a fault condition.
Be carefull with the high voltages. The flyback voltage is very high (20-30 Kilovolts !) and may be lethal !!

tepeque1,

You did not mention if you also lose sound. If you do not, you probably have a problem with the high voltage section. It is failing, shorting, and has not gone completely yet. The flyback specifically is shorting out and needs to be replaced. I have a tip at http://www.fixya.com/support/r4916851-diagnosing_repair_tv_high_voltage which explains how to find and replace the flyback transformer and repair the high voltage section as well as where to get the replacement parts.

Thanks for using FixYa and for the great rating.

hardrocko

for sure your tv has power as indicated by your flyback hissing it also indicates leaking high voltage that might destroyed your vertical or any other parts near your flyback ,the flyback itself should be replaced for its high voltage arcing can ruin so many components

Hi

Flyback is a step-up transformer multifly the voltage depends on the size of the tube and supplied high voltage to cathode ray tube.The minimum output voltage of this is 14000v DC for 14 inches crt monitor what if your crt is 17 inches 17000v DC very dangerous if you are not electronics repairman.

check the memory IC, Horizontal-vertical IC then check the processor voltage are the stable & is it support the refresh rate. at last check the EHT transformer, may be your processor controlled through it or it loses the flyback voltage .

Flyback part number RTRNF0033MEZZ

I got KV 32ts 46 Sony
Turn on TV and seems OK, then no picture but have sound. I turn it on and off some time pictures come back but goes out again. Pleas help

If still under warranty or if you have no electronic repair experience you should take the set back to the shop or to a repair person. Some of the solutions described below can be dangerous, TV's are very hazardous to service. Even when plugged out, TV's can store very high voltages. This is probably a startup problem. It may be as simple as an open resistor that provides initial drive to the horizontal deflection. Check for power to the horizontal output transistor. If there is, check for drive. Could also be a bad flyback transformer. Another problem might be that the set is in high voltage shutdown, possibly due to a faulty voltage regulator. Check the regulated voltage going to the flyback primary (it should be marked on the circuit board what that voltage should be... 120V-140V in most TV's). If it is too low, the flyback transformer or one of its secondaries is probably loading down the primary input. If the voltage is too low, try disconnecting the secondaries. If the voltage remains too low, try disconnecting the primaries too. If the voltage is then normal, the flyback is bad. A REALLY bad flyback will also blow a fuse. don't leave the TV on too long with a shorted flyback, the h. output transistor can get too hot and probably fry, if it isn't fried already. If the primary voltage is too high, then the set is probably in high voltage shutdown, possibly caused by the voltage regulator. Good luck, and stay away from it if you haven't done this before. Take it to a lab if it's worth the repair.