Question about Mitsubishi CK-31304 TV

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Vertical deflection went out and now HV is going into shutdown

I replaced the vertical deflection chip and it worked for a minute then went out again. I don't have a schematic and I noticed that vertical deflection circuit is designed with exact tolerance, no vertical adjustment.

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Hi,
Get service manual / schematics from HERE and find why vertical uotput IC is blown in your TV.
Service Manual will also give you info how to perform vertical adjustments.
Hope this info will help you to resolve problem.

Posted on Aug 22, 2008

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The JVC sets are well known for this type of problem, the tv has a vertical deflection issue needs a few small parts and a touch up on the vertical ic, causes the set to shutdown. I recommend a tv technician for the repair.

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HI. this may be a fly back situation. this is a transformer that is located on the power board section of your set. This device stores and, distributes the necessary AC current needed for proper CRT performance. There is also a horizontal deflection chip that will shut off the transformer if it becomes unstable as well.

I recommend checking the Horizontal deflection chip for damage. if this chip is in good condition, replace the HV Fly back transformer.

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If the line is vertical then the problem is no horizontal deflection. The vertical chip is probably fine.

Check connections around yoke (thats the connector with at least four wires that goes up to the coils around the neck of the tube)

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Hello SpyTan,

You have a vertical deflection problem. This is either caused by the vertical yoke transformer going bad or the vertical coupling capacitor going bad. It may even be one of the components in the biasing circuit that delivers the vertical deflection signal. In any event this may be causing excessive current which then causes the shutdown circuit to activate. I would have a qualified TV technician check the vertical defelection section of the TV.

I hope This helps,

Thank you,

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1 Answer

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It is unuaual for the horizontal to go out, leaving a vertical line.
The vertical gets it's power from the horizontal circuit, so if the hor. fails you should have nothing on the display. In this case it may be as simple as the hor. connector to the yoke being burned and not making a good connection. In any case I'm sure the circuitry is ok and you should look for cracked solder joints and/or burned connections. The shut down could be due to there being no hor. deflection, causing the HV to go to high, causing the shutdown. You should check/replace any capacitors that are bad, especially those around the HV shutdown circuit.

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I know your problem for sure. If the fine line you are seeing is horizontal, you have a bad capacitor (or cold solder joint) in the "vertical deflection" circuits. Look for four of the largest wires coming from the picture tube and follow them down to the circuit board. These wires do NOT come out of the BACK of the tube, where most of the wires come from, but rather come sort of from the side of the tube. Two of them will go down to the board near the largest component on your board known as the "flyback transformer". Disregard these two and follow the other two. They will go near either two transistors or a vertical deflection chip. The board will normally be labeled "vertical" or vertical deflection near these transistors. There will be two or more capacitors very near these transistors. Look at them on the underside of the board and look for a bad solder joint. Push on the capacitors left and right while observing the underside of the board and you might be able to see the bad joint. If it is a chip instead of transistors, you could still have a bad capacitor or cold solder joint, but in most cases if it's a chip, then the chip is bad. Since, however, you can tap on the tv and make it work temporarily, this tells me that you probably have two vertical deflection transistors with associated capacitors. If the caps are good and no cold joints, then replace the transistors. This part of your tv is what pulls the electron beam up and down vertically and is thus called the vertical deflection circuits. With no vertical deflection, then the beam just moves left and right and never moves up and down. The picture is still there, but it is contained inside the fine line where of course you cannot see it. The parts in this circuit are not expensive at all. Keever

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1 Answer

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Ed
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It sounds like a vertical deflection problem. You mentioned you had a white HORIZONTAL LINE in the middle of the screen. If this line runs from left to right across the screen it's in Verticla deflection. If it runs from top to bottom, it's in Horizontal deflection. I am assuming the problem is a Vertical deflaecion problem. The repairs necessary are most likley to replace the vertical capacitors or the verticla deflection chip.
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Ed
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If the vertical is not defective or shorted there is a possiblity of bad solder connections on the vertical ic. If connections are good and has b+ voltage to the chip replace chip which is IC 501 LA7841 or LA7845 and change c511 (decimal point 1 film capacitor)

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