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Horizental Line in crt of Onida 21" by using vertical Ic LA7840

24Voltage is dropped of supply resistance of Vertical Ic (LA7840)

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Posted on Jan 02, 2017

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SOURCE: LG vertical failiure vertical line at the bottom of the crt

replace the vertical driver ic and the proccesor ic

Posted on Nov 25, 2008

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SOURCE: vertical line in center have replaced vertical output ic

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)

Maybe that TV has two horizontal output transistors. One for deflection and one for high voltage? Check both of them. Look for bad solder joints!!!

Posted on May 22, 2009

gopakumarg43
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SOURCE: I got the problem for my Panasonic 21 TV (CRT

Hello
Have you recently replaced its Line Output Transformer [LOT]?. If so have you replaced it with same type and number? Verical bars are due to LOT to Deflection Yoke mismatching. It is known as "Yoke Rigging" technically. Replacing the vertical Ic won't help in this problem . If you have replaced the LOT, the replaced one is not orginal. Ok

Posted on Oct 31, 2010

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2 Answers

Why come white vertical line on my t.v screen in center?


You said "I checked vertical output line from main ic pin 23 found correct"

But the problem is "Horizontal Output Line" Try that.

Jan 29, 2015 | LG Televison & Video

1 Answer

Why I have a thin line across the screen in my TV model Panasonic TC 21. After replacing the vertical IC the horizontal line across the screen reduced to few inches and not as it was earlier. vertica


First, You should to replace by original part, then you should check the voltages on power supply, and check the voltage for vertical IC based on datasheet, also check the voltages on vertical section including yoke and last you should check the ESR capacitors on vertical section.

Oct 13, 2014 | Panasonic TC-21PM10RQ 21" TV

1 Answer

Onida tv


Horizontal line on screen denotes the absensce of vertical sweep itself. Check the vertical output section circuit to LA7840. Check for any loose solder terminals. It will be best to measure the input voltage to that IC from the LOT secondary supply. Try by replace the IC. If these do not help you, measure the frequency from the main IC. It should be at 50Hz. If this frequency is not present, the main IC is faulty. If you wish to get some more details about the circuit, check this link. http://electronicshelponline.blogspot.com/ Pull up older posts there, either by its left side bar, or see it in Timslide option. Schematic diagrams, that show vertical IC LA7840 is given. You can compare it.

Jun 23, 2013 | Televison & Video

1 Answer

TV MODEL :SANSUI HARD ROCK 21'' PROBLEM : TIME TO TIME ONE HORIZONTAL LINE COMING WITH BLACK SCREEN


Hi The problem of your teevision is what we called the vertical line problem.The problem is in the vertical section of the board.There are many of cause of that problem.First is either loose connection,the circuit at the vertical section have cold solder so its need to resolder using soldering iron.Second,it maybe no vertical supply,its better to check the 12 volts dc supply of vertical ic output.if thers no supply in the ic,there a open resistor near the flyback.try to replace.Third if theres no loose connection and have a voltage supply the problem is either leaked capacitor or deffective vertical ic output. Commonly in that problem is the loose connection,try to resolder the verical section.

Jul 12, 2011 | Sansui DTV2760 27" TV

1 Answer

When TV contrast increase tv off with horizental line


Hi First check the vertical load resister it is high value.And then check vertical output capaciter.Finaly replace vrt ic.
thanking you

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LG vertical failiure vertical line at the bottom of the crt


replace the vertical driver ic and the proccesor ic

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Check voltage supply at vertical amp ic ,if present than change vertical amp ic.Some times supply line is dameged by faulty amp ic.therefore you have to rctify supply and replace ic.Check supply line fusible resistors.
gopal

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