I have a sanyo avm3259 that i am trying to fix i was told it might be the vertical deflection ic or its supply resistor i have changed the ic (la7841) but i dont know the resistor number to change can anyone help
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Re: avm 3259 picture problem
Vcc is on Pin 6 of the vert. output IC so you can trace that back to it's feed resistor (not sure the location number but you can find it easily by following the circuit trace).
Depending on what your problem is you may need to replace some
electrolytic capacitors as well. Follow pin 7(pump up) back to it's electrolytic
cap. and look for swelling or bulging. Look for other bulged capacitors in the vertical section. You may also identify a bad resistor by a discolored look but not always, if in doubt meter it. Let me know if you need some more info.
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You have a thin horizontal line in the center of the TV. You, in this case have vertical IC that has bad grounds. Resolder the vertical IC pins and check the capacitors in the immediate area and replace these caps as necessary. If you still have a horizontal line, you will have to replace the vertical IC. Find a TV tech or someone with electronic experience to do this for you. Should be reasonable to fix. Thanks for asking and Good Luck!
Your picture tube is fine for now, but it won't be if that line is allowed to burn into the screen. You have lost your vertical deflection. Since a fuse was involved, that indicates that an overcurrent condition existed. You may have a blown vertical deflection IC, or there could be just a shorted diode, which caused the overcurrent, and subsequently burned a resistor in series with the diode, also acting as a fuse. It could be all three.
this is a capacitor that has gone bad in the vertical delfection stage of the tv. it is an very easy and cheap fix if you know someone who knows how to solder and replace electronic components. If not then you'll just have to get another tv as taking it into a tv repair shop is not worth the cost. You could get another tv for what they will charge you to repair it,
You have a failure in the vertical deflection circuit. This could be either a bad vertical chip, the power supply that runs the chip or a bad capacitor in that circuit. This is usually a repair best left to a professional. There is a small possibility that it could be bad solder connections. If genlty tapping the unit temporarily solves the issue you can try and resolder the pins on the vertical chip LA7841 is the part number. There is also a resistor 1 ohm 1 watt. If that resistor is open you can assume the IC is bad
I don't have any specific information on this model.... but I can tell you that the problem is the vertical deflection IC or just the solder connections on the PC side of the IC. The part number usually starts with the letters LA and then 4 numbers. Will be on a metal heat sink. And sometimes there is a 1ohm resistor that opens and even the diode may be bad in that circuit coming off of the HV transformer through the resistor and then the diode then to the vertical IC Hope this helps.
It isn't a transistor, It will be an I.C. with a part number that
probably starts with an LA_ _ _ _ . It will be on a heat sink and
be in the vicinity of the connector going up to the yoke. Try
replacing that. But first, check all the electrolytic caps around
it for testing dry (sorry - takes a special meter to do it in circuit)
or just replace them. May have lost power to the I.C. as well.
Look the I.C. up in the free NTE crossreference at nte.com get a
diagram of its pinout to find what pins the power and outputs are on.
I don`t know where you live and it makes a BIG difference, the cost of doing business is waaay more in NYC than Peoria. At my shop if you brought it in, approximately $110 plus tax (6% here in Fl.) I`m basing this on the fact it needs the output IC, you may not need the IC it`s possible the 26 volt line is missing to the IC but you asked for a generic guess and that`s what it would cost you here, remember: Big City means big rent which means much higher bill, I`m in a little town in western Fl. hope this answers your question, good luck
The vertical output IC has stopped working. The vertical output IC is the part that drives the coils in the yoke that spreads the picture up and down. This could be because it has cracked loose from the board (solder joints) or it simply burned out. Sometimes a bad pump-up cap will cause the vertical output IC to short out, and when the IC shorts out it often opens up a small value resistor next to the flyback. This is a relatively easy thing to repair. A qualified tech will be able to tell exactly why the vertical output has stopped working and repair it for you.