Question about Konka K2386U 23" TV

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Konka k2528nf i change vertical ic & y/c jungle and all related capacitor in vertical section but still vertical line appears, pls help me

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Konka crt tv model k1998 have only horizontal line on screen .


Check and replace the damaged component/s at its vertical scan output section circuit. The vertical scan is absent now. Check and replace damaged component/s at its horizontal scan output section circuit. Check the LOT (Line Output Transformer) too for damage. Replace the horizontal scan output transistor. Check the input voltage to LOT. If the voltage is absent check the feeder resistor; if any. If you wish to get some details; check the site linked here. Pull up older posts.
http://electronicshelponline.blogspot.com/
Type in this key phrase " my service table today " in the search box at the top right of the display window of the home page, to get gathered some pages which has the details of practical experiences to the author of that site.
Troubleshooting to similar faults are given.
The circuit diagram to this set too might be there. Type in the IC number [chroma jungle] in the search box, at the top right of the display window, to get gathered the posts that have circuit diagram.

Jul 14, 2016 | Konka Televison & Video

1 Answer

I have a thin line in my tv and i dont know what ic no.to replace?


The fault is a failure of the deflection circuit and since you have not specified whether it is a vertical or an horizontal line the section failed will be related to the position of the line.
If horzontal the vertical IC or the section related is faulty and if Vertical the horizontal section., Now this can be the deflection IC, teh deflection coils or even discrete components like capacitors or resisitors in this section which will require a signal trace with a voltage test before the absence of the sync pulses are confirmed and the section identified.
I request not to change the IC unless it is proved but you can solder the vertical IC or the section concerned -- if there is dry soldering.

Aug 25, 2011 | Toshiba 32A50 32" TV

3 Answers

Tv has horizontal lines on top of screen.


Hello
You are seeing vertical retrace lines on the top of your TV screen.
There are mainly three causes for it. I don't know the age of your TV. The first cause is due to the supply voltage lack to the video output state. You can check it on the picture tube base card. You haven't mentioned about the diamension of your TV screen. So it can be say as a guess. If your TV is 27", the voltage mantioned above will come to about 245VDC. If there is a great voltage loss, check the smoothing capacitor to that supply, will normally come to the value of 10MFD 450V.
The second one is, capacitor related to the vertical output stage of your tv. It is in the circuit board. Normally these capacitors are situated in an area, which will get hot during working. As s result, there is a chance to the value change of their capacitance. It is best to replace all of them, as it may not cost too much. Before desoldering it out, mark the value of each capacitor is best. Normally replacing the filter capacitor 3300MFD or so,to the power supply to the vertical output Ic will solve this problem.
The third is related with the vertical output Ic itself. Just check all the soldering points in the vertical output section of your tv board. Anyway, resoder all suspected soderings by applying a little more solder, as bad solderings to the legs of the Ic or some other components also may the cause. OK.

Nov 10, 2010 | Toshiba Televison & Video

1 Answer

Our set was purchased in 2001. In the last month we've seen a narrow band (2") of parallel, "rippling" lines appear horizontally across the screen, just above mid screen. At first they...


Hello
You are saying about vertical retrace lines. Thes lines will be thin and spread all over the screen at about 1 inch aprat or so, little slanted in position. There are mainly two reasons for this fault. One is vertical output Ic and its supply related. Second is related with increase in screen voltage.
You just open your TV,and adjust the screen voltage a little less, by the help of screen voltage adjuster reistor. It can be located on the picture tube base card, diretly soldered to it. If it helps no need to do anything. After adjusting the scren voltage, increse the brightness contol a little and see whether the lines are there or not. If not it is ok. If yes, you have to go to the vertical output section of your tv. Any screen voltage adjustment should be done after decresing the brightness, contrast and colour controls to its minimum. At this condition you will only see the display items only. Screen voltage is so much related to picture clarity. It must be done in a dark circustace.
If it doesn't help, that is even after the lines are there when you increase the brightness, locate the vertical output section of your TV. It will be normally on the main board, and there will be an ic for amplifying vertical sweep signals. If its supply voltage has some trouble, this type of fault may occur. As your Tv is abot ten years of age, it is quite natural, that most of the capacitors has gone value detained. It is best for you to change all the capacitors, at about 14 nos of them at the same time, as it will cost not much. Change all the capacitors around the vertical output ic is best, as you can't measure the exact value of capacitors, without a capacitance measuring meter. Also look for any bad, or loose soldering is ther to the pins of the vertical Ic. Resolder all the points around and with it by applying a little more solder. This will retify your problem. Ok

Nov 09, 2010 | Sony KV-27FS16 27" TV

1 Answer

When the TV is first turned on, thin white lines appear horizontally across the top 4" of the screen. The lines go through the picture, distorting it. After the TV is on for a few minutes, the depth...


On this particular model there is one capacitor from the video process IC (jungle IC) that supplies the Vertical pulse that shoul be changed.
This is an easy repair if you've ever soldered and would not be too costly for a repair shop to do it for you. The problem is a bad Vertical Output IC (usually mounted on an aluminum heat sink with the part on it labeled LA78?? ) and 1 or 2 bad capacitors. Some times you can even fix the problem by re-soldering the contacts of the IC- To find the IC follow the 4 wires that come from the Yoke (which is a contained coil of wires slipped over the neck of the picture tube(s)) back to the board. 2 of the wires go to the horizontal o/p and 2 to the Vertical o/p the thinner gauge wires are for the vertical. Be sure to vote/rate me if this helped Thanks!

Oct 23, 2009 | Toshiba 36A50 36" TV

2 Answers

Philips TV (old) showing a horizontal line in center of screen


Check for the cracked solder joints on the IC or dried capacitors on the vertical side

Mar 28, 2009 | Televison & Video

1 Answer

I have a white line consisting of a series of dash marks appearing along the top left corner of the 42hpx95 tv. Any ideas? The line is approximately 8 inches long.


Hi,

Initially, I would suspect that a capacitor at the vertical section is about to fail. This i8s a relatively easy fix and would only require basic knowledge of electronic circuitry and components and a little soldering. The capacitor would be the biggest of the bunch in the vertical section. The vertical section can be identified by the presence of the vertical deflection output IC which is normally attached to a heatsink. Should you be uncomfortable performing a DIY and just winging it as opposed to getting a Service Manual (or at least a schematic diagram), perhaps your best would be to seek the services of a qualified professional.

Hope this be of initial help/idea. Pls post back how things turned up or should you need additional information.

Good luck and kind regards.

Thank you for using FixYa.

Apr 28, 2008 | Televison & Video

3 Answers

Sony tv no picture only horizontal line


The probable defective part is the vertical IC. If changing that does not resolve the problem, check the capacitors in the same circuit. Also, check for the proper voltages at the vertical IC. If the IC is not being fed its power, it won't work either. I don't have a listing for your specific model. If you can post the vertical IC part number (LA7837 for example), I can list the voltages per pin.
Dan

Apr 09, 2008 | Televison & Video

1 Answer

HP L1706 monitor with thin white/blue horizontral line


It is the problem of monitor pcb in vertical section.check vertical ic for dry soldring. Resolder the ic if problem still on then change ic or check components related ith it. check continuity of vertical deflection coil.
Hope this be of initial help/idea. Pls post back as requested, how things turned up or should you need additional information.
Good luck and kind regards.
Thank you for using FIXYA.

Mar 13, 2008 | HP L1706 17" LCD Monitor

1 Answer

Television


Hi,

From what I can understand, your problem is:
1. either a single horizontal line (from left to right), very bright, no picture but with sound, if yes then it is a failure of the vertical section. More often, it is the vertical IC that is at fault, sometimes the vertical capacitor. Still, in other cases, it is a case of cold solder; or
2. multiple lines across the screen with the picture overly bright and with sound. If yes to this one, then it is a matter of excessive screen voltage. This is adjustable using the HV Screen control that is at the rear of the Flyback Transformer.

Hope this be of some help/idea. Pls post back how things turned up or should you need additional information.

Good luck and kind regards.

Feb 10, 2008 | Televison & Video

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