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i took a FBT from an old screen and now i want to understand how it works where in the input volt of it? there are so many wires and inputs there. i was looking a data sheet and did not find any. i added some pictures also. thank you.
Registered Member #834
Joined: Tue Jun 12 2007, 10:57PM
Location: Brazil
Posts: 644
See if you can find the code in the listings here: Look at the schematics and you will see what are all those pins. The pins in the arc are usually the primary coil and a few other coils, for feedback and low-voltage outputs. One of them is the ground connection of the HV coil. The other pins are the ground connections of the potentiometers and of a filter capacitor.
on my model is written: 6174z-1018F 2AG 11 i didnt find it but i found: which is the most similar but no data sheet.. do you might have another site? thank you
Registered Member #834
Joined: Tue Jun 12 2007, 10:57PM
Location: Brazil
Posts: 644
This flyback is used in the LG CB-795 plus monitor. Here you can find the schematics of this monitor. The flyback connections appear on the last image:
Registered Member #834
Joined: Tue Jun 12 2007, 10:57PM
Location: Brazil
Posts: 644
Maybe a different version, or an error in the schematic (very common). You can verify if the connections are as in the schematic. Don't trow away the board. There are lots of useful components on it.
Registered Member #1565
Joined: Wed Jun 25 2008, 09:08PM
Location: Norway
Posts: 159
The board is also a (possibly good) way to drive the FBT, if you can figure out the circuit. Looks like you possibly can power the board "as it is" and get HV (b.t.w. it DO dislike sparks so best for eletrostatic motors, small lifters, and drive HV & CRT tubes)
The circuit as you have it on the board drive the FBT from 190V for the primary and 15V for the FET-driver.
If you use other drive-methods, you can quite easily messure the output voltage on that FBT by connecting pin 11 and 12 and messuring current toward pin 7 (HV return), beware of pin 15, it should be isolated properly if you don't want filter on the HV or connected to pin 7.
What state is the board in? all parts still on it?
Registered Member #834
Joined: Tue Jun 12 2007, 10:57PM
Location: Brazil
Posts: 644
Note that in the schematic there is a switching regulator between the 190 V supply and the input for the flyback driver, so the actual input at pin 3 is smaller. There is a complete switching power supply powering the entire circuit, that (if not damaged) can be separated from the board quite easily and used for many purposes. A better schematic:
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FBT - help
