I have the KV-34-34HS420 with seven blinking led no power problem so I replaced both IC's and I used sockets because of the probable failure rate. I turned it on and it's been working perfect.We bought a new samsung because we thought we needed a new set.Oh well I guess the den will get a nice Sony TV now.I also think the big tube sony has a better picture.
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what is the issue here? well its the control board that holds the IR sensor that has failed OR
The lens is so dirty that the infra red is not passing threw it so try to clean off the lens with some rubbing alcahol. If that does not work then your going to need to have the tv repaired a control board is upwards of $70 bucks with your labor.
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OK the bowed effect is an IC that controls the picture It replaces the flyback transformer of older TV's ( some plasmas still use transformers) Standard TVs nearly alsways have them Doubhle vision ( ghosting is bad convergence) Color variances Control caps on sustain or main color board.
Now these controls are spread over the two sustain or color board/s
Now some think that replacing these boards will fix their problem and many are right( at least for a while) But there is a penalty for DIY without knowing what voltages should flow from the control board to these parts. ( after all something caused it in the first place and it can be hard to find what was the offender) There is also the tuning of the convergence and getting the picture to display correctly ( generation of TEST pattern to get this right)
If you have the skills understand electronics and have acess to the right tools it can be a cheap option to fix it. But My advise is call a professional. That way you avoid HT electric shock Radiation from the rear of the tube and extra expense from a further failure a bit further on.
Boards cost about 2-300 to buy serviceman charges about $450 with parts and tuning.His/her work also carries a guarantee
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In cannot remember if this model of set uses on the CRT drive board a drive IC for the CRT colour channels, or if it uses descrete transistors. I have had component failure on this board that causes your description. The failure in your case would be with the red channel drive. Most of the time I had the semiconductors fail, and some of the support components.
Most of the time, a failure on this board is caused by some intermittant internal arching inside of the CRT. If this happens, the CRT is starting go defective.
Another cause of this fault is that the CRT is starting to go internaly shorted between the control grid and screen grid. As it heats up, the shorting becomes lower in resistance, and thus causes the pricture to go brighter until the protection turns it off. This would be with the red electron-gun.
With any failure with the CRT, the set is not worth to fix even if you can find a CRT for it.
Here is the info on your problem. These are problems that have been found in the field.
Found cold solder on IC201 on the A Board. IC201 P/N 875210025 CRT Driver
Found IC9001 on the C Board defective. IC9001 875936083 TDA6111Q/N4 Video Output
White balance failure 5 times 5:0 or 5:1 • Video OUT (IC9001-IC9003) is faulty. • No raster is generated.
(not balanced) (C Board) • CRT cathode current detection
• CRT drive (IC201) is faulty. (A Board) reference pulse output is small.
• G2 is improperly adjusted. (see Note 2)
The fault may be the control panel, or it may be in the uPC itself.
Most of the time, it is some of the switches on the control panel.
The most common cause of this type of failure is that many times when people clean the TV set, they spray cleaner directly on the screen or the set. The liquid runs down in to the set and causes damage. Sometimes the damage can be very expensive!
If the fault is just the control panel board, this can be easily replaced. You can order one from the manufacture's parts department or from one of their parts distributors.
You will need the service manual, a scope, and a DVM to troubleshoot the problem if it is more involved than just changing the panel. The only way to know is to try the panel unless you have a way to test it.
It seems that you most likely allowed some liquid to flow down to the circuit board. I can probably gaurantee that there is damage done to the control circuits for the uPC or the uPC itself.
You will have to give the set out for service. You may be lucky and it is only the control board including its electonics that has to be replaced. If the damage was done to the uPC or if there is a damaged buffer IC on the main circuit board between the uPC and the control panel this repair will be very costly compared to just replacing the control panel cirucuit board.
When cleaning a TV screen use a very soft lint free tissue paper. Use only some light spray of a very weak or diluted glass cleaner, or just water on to the tissue paper. Never put enough liquid that there is a possiblity of some of it dripping down in to the circuit board.
I personal use a light spray of water on a soft tissue. This is safe, and will not remove the optical coating on the screen surface.
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.
You must have checked fusible resistor?
check convergance control panel and check voltage supply to this board.If voltage are o.k than you have to change convergance control ic which is smd ic and its on the control board.