Ok so just as a preface. I am a 5th year electrical engineering student. I am very aware of electronics, components, soldering and safety. I've never worked on a TV before. With that said, after reading other's questions, I discovered that the flyback xformer was bad in my set. How do you go about replacing it is my question. I can order a new one and solder it (Part Number 257805 right?) But it looks like the wire from the tube just plugs into the transformer, much like a spark plug wire. Or do I just need to replace the whole wire (which I didn't think you could do because that would break the vacuum in the tube after you take the suction cup off)? Thank you.
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Re: Flyback Transformer Replacement
ACME has FBT with 1yr. warranty on them. 1-800-575-9833 I have Never had any Problems with flybacks from them.21.95 for part their. DO not get the HR fly they have focus and high voltage wires backwards.Most of the high voltage wires you twisted them out from flyback then reinstall in New one.And the button on end of wire is Anode button that connects in picture tube.
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1) You must test the a) fuse b) c.breaker inside c) diode, d) rectifier e) transformer f) filter. g) IC. regulator voltage and test it. If the problem persist you must go to the horizontal problem by lack of RASTER, now you test the transistor horizontal power, flyback. If you have some experience with the electronic you can try. If do not, better go to the repair shop Tv. Since you can have a electric shock by H.Voltage discharge. God bless you
Hello The LOT [Line Output Transformer] of your TV. It should be replace with same type and number. Actually this is a skilled work. You have to unsoder this component out from the circuit board, and to resolder the new one in place. Have to adjust the perfect screen and focus voltage. Screen and focus voltage controls can be seen on it. This component can be bought from most of the electronic spare part shops at your tow. The number printed on it is important and should be noted. The sample picture of that component is attached here. This component also known as Flyback transformer. OK.
turn (only by 2 to 5 degrees ) all the knobs on flyback transformer in clockwise direction & then switch on tv .............you will get picture atleast for 1 or 2 mins ............ this confirms only flyback transformer is defective ........ so it has to be replaced by new one .................otherwise transistor (big in size fixed near flyback with its back clamped or screewed to aluminium metal ) has to be checked ......if that is also fine then complete main board has to be checked ...... but flyback replacement is a must ........in your case iam 100 % sure only flyback is deffective ...........
turn (only by 2 degrees ) all the knobs on flyback transformer in clockwise direction & then switch on tv .............you will get picture atleast for 1 or 2 mins ............ this confirms only flyback transformer is defective ........ so it has to be replaced by new one .................otherwise transistor (big in size fixed near flyback with its back clamped or screewed to aluminium metal ) has to be checked ......if that is also fine then complete main board has to be checked ...... but flyback replacement is a must ........in your case iam 100 % sure only flyback is deffective ...........
i hope your tv is more than 4years old ....... in all CRT TV's or CRT monitors after 4years a component called flyback transformer (see picture ) becomes weak - its work is to supply voltage to tube............. then following are the signs ... (1) in some TV's only front LED's blinks - no picture no sound.... (2) in some TV's picture comes slowly after few seconds or after few mins or after few hours......... (3) in some TV's suddenly picture & sound goes temporarly & after some time again it appears ...... etc in case of (2) & (3) only flyback transformer needs to be replaced .....100% GUARANTEE again TV works normallyBUT in case of (1)... --------------- YOUR CASE (a) either only flyback transformer gets deffective or (b) flyback transformer & another component called transister ( will be near flyback transformer & its back portion is attached to aluminium metal ) gets defective or (c) along with flyback & transistor -- 3 or 4 more components (resistors, diodes, some times ICs ) gets deffective so replacing flyback transistor is a must .. & to find whether any other component is deffective or not completemainboard has to be checked ....... so if you are a technical person & having expierence in servicing line then you can do it yourself otherwise approach good tv service engineer ........... your TV is really very good one ... so don't think of buying new TV .... just goahead for repairing it it is worth & it works for atleast 2 more yrs....... try this & tell me what happened switch off your TV ... remove power cord from socket ,,,,.ware some mat or chapples to your feet ..... remove your TV's back side cover ......... observe carefully for any physically damaged components .... if you find then don't do anything ... close tv cover & approach tv service engineer ............. but if no physically damaged components are visible then take a suitable screew driver & rotate 2 (or 3) Knobs on flyback transformer in clockwise or anticlockwise direction - very little ( 4 or 5 degrees ) - you have to do this without touching any cable or any part of your tv .......... then fix..... back side TV cover ........connect power cord - stay at a distance & switch on your tv ......... if you get picture atleast for few seconds then in your case only flyback transformer needs to be replaced otherwise complete mainboard has to be checked. to find other deffective component ............. so your tv problem is a harware problem - it cannot be solved using remote control or any buttons on your tv ..... if you are finding difficult to get it repaired then you can remove your tv mainboard with the help of some technician & send to me ...... i will replace deffective components .... & send back to you ....you only have to bare the shipping charges .....it will take maximum 12days (5days - to recieve + 2 days servicing + 5 days to send back to you )....
Discharged Flyback Transformer. Removed main pc board from bottom of TV and flipped over, no apparent damaged components or blown board traces were found. Noticed a lot of flux in various areas on the board that seemed unusual (maybe TV was worked on before as I bought a showroom demo at Circuit City). Used a plastic screwdriver to remove all flux between connections on ICs, Transformers, Flyback Transformer, and various other components. Cleaned all debris, dust and crud accumulation (TV is over 10 years old and there was alot around the Flyback Transformer) from both sides of board using a lightweight paint brush.
Used a magnifying glass to check all solder joints for possible cold solders and found none. Did the same for Power Supply Board. Checked various ICs and Power Transistors for opens or shorts (in machine) and they seemed fine. Reinstalled boards, said a few Hail Mary's and fired it up.
The protector Led no longer flashed under power and lo and behold I got picture and sound!
I cleaned the lens on the projectors (again 10 years of dust accumulation) did a magic focus adjustment and it works fine!
After reading other fixes, I fully expected it to die after 10 minutes so I left it on all day and against all odds it still works.
What was the fix......Dirt buildup on and around Flyback and other components,,,,,,Flux conducting electricity between contacts on Flyback and other components.....or oxidation on connectors between Power Supply and Main Board.....I don't know.... all I know is that for the moment I saved around $ 300 - 400 in repair bills by doing it myself.
A flyback transformer is one of the more expensive components in a projection TV. If there is no clear reason, such as a known power surge, you could well replace the flyback transformer again soon because the root problem was elsewhere.
An OEM transformer is not necessary but you might have trouble convincing an authorized factory service technician to use anything but the original manufacturer's parts.
As with many of today's electronic devices, if it is more than a year or two old, you will find the new products cheaper and with more features.
The next generation of projection TVs will use lasers and scanning will be done with optically controlled micro-mirrors - no flyback transformer required.
There is a fix for this fault. The symptom is displaying line flyback pulses. As the electron beam traces the picture it scans from left to right. When it reaches the end it quicky positions itself to the left again to trace a new line under the last one..(line flyback). As it moves bback to the left the circuity is supposed to blank out the beam so you cant see it. therefore the problem lies in the line flyback blanking circuit.
When you change the flyback and the HOT you are supose to replace a small capacitor that came with the flyback and also the small coil l401 that connects the hot base to the horiz. driver transformer secondary is supose to be taken out, the leads scrapped off of insulation and resoldered into place.