Does anyone know where I can get this board. One of the switches broke off, then my kid decided to use a scissors to turn the tv on which worked until all the wires were cut off it and the board got trashed. All the sites are saying that it is discontinued.
- If you need clarification, ask it in the comment box above.
- Better answers use proper spelling and grammar.
- Provide details, support with references or personal experience.
Tell us some more! Your answer needs to include more details to help people.You can't post answers that contain an email address.Please enter a valid email address.The email address entered is already associated to an account.Login to postPlease use English characters only.
Tip: The max point reward for answering a question is 15.
check and replace the damaged component/s at its audio output section circuit board. If needy, replace this board as card basis. If you wish to get some details; check the site linked here. Surf the site with patience. Pull up older posts. Surf the site with patience. http://electronicshelponline.blogspot.com/
There are small tact switches behind the buttons on the front of the TV set. These switches go intermittent sometimes on Toshiba TV's and will cause all sorts of problems. This could be due to someone spraying the front ogf the screen with cleaner and the cleaner dripping down the front by the picture tube and dripping onto the printed circuit board. This can be checked by carefully sliding out the chassis of the TV set and looking for a green corrosion around the small switches. If you have no experience with printed circuit boards or TV repair, play it safe and take the TV set into a repair shop, as this should not be a big deal or cost you a great deal of cash. Good Luck
It's probably a write-off. The circuit board inside has been cracked so that some of the copper traces that connect parts have broken. This commonly happens around the area of the horizontal output transformer, which is heavy. The shock of the fall causes the transformer to bounce and breaks the board. Other areas too may have been damaged because of flexing. And worst, the picture tube can be damaged in a fall, so it either doesn't work at all or shows permanently distorted colors.
It's tough to find anyone willing to repair a set that's fallen. Many circuit board tracks are very narrow and hard to repair. Then it's difficult to know if all the damage has been found and repaired, so even if the set starts working a technician doesn't know if something else won't go wrong. And then there's that bad tube possibility; no technician likes to spend lots of time fixing a broken board only to find the set then needs a new tube. Trust me, this has happened to me several times during my career in TV shops.
Your best bet is to use this as an excuse to buy a new LCD or plasma TV. 40-inch models, a good size match for a 32-inch CRT (tube) model, are reasonably priced.
You're describing the classic symptom of bad solder joints at the vertical output integrated circuit. This part gets quite hot while operating (which is normal - it's mounted on a metal heat sink to help dissipate that heat), and over time the heat can cause cracks in the solder joints where the part connects to the circuit board.
Whacking the set, as you've discovered, can get the joints to work for a while, but the permanent fix is to resolder those connections. It only takes a few minutes to do the soldering, and if I remember these JVC sets correctly, getting at the solder side of the circuit board is not too difficult. If you don't know how to solder and don't know anyone willing to try, a professional TV service technician could do it. It wouldn't be the most expensive of repairs, much less than the cost of a new set.
It might turn out that after repairing the solder joints so that the picture comes back, a few capacitors in the vertical circuit need to be replaced as well. This is common, so if a tech tells you some parts are required he isn't just changing them for no reason. But it shouldn't need more than 3 or 4, and they should only cost a few dollars.
Hope this helps you decide what to do. Thanks for using Fixya!
My one year old 24" RCA was having the same problem and also changing channels on its own. I decided to do some experimenting. (Warning: High voltages exist inside a TV even when it is unplugged. Messing around inside a TV may be very dangerous and stupid.)
I found that there was a 5 wire ribbon cable that connected the circuit board with the front control buttons to the main circuit board. I discovered that if I turned the TV on, then disconnected that ribbon cable from the main circuit board, the TV was stable, it would not do anything on its own. Obviously, I could not control it either with the ribbon cable disconnected.
Since there did not appear to be any ic chips on the button circuit board, but mainly some resistors, I theorized that the buttons simply caused a certain voltage signal to be returned to the main board. I further theorized that perhaps the voltage being sent to the board was varying causing the return voltage to also varying making the main board thing a control signal had been sent.
The five wires are labled on the small control circuit board. One was labeled "key". (or maybe "keys") I separated and cut that wire. The TV was then stable. It could be controlled by the remote control, but the buttons on the front were now not functional.
I connected some longer wires to the "key" wires and ran them outside to a switch. The TV now works fine with the remote control and is stable and will not do anything on its own. If for some reason I do need to use the manual buttons on the front, I can simply flip the switch on and the buttons will work. However if I leave the switch on the TV will again be unstable, turning itself on and off and changing channels.
The only board i show there that is discontinued is the Front Control Board Assembly. There are other boards in this unit that are not listed. So I may still be able to find it for you. Are you sure that the Front Control Board is what you are looking for? Let me know.