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Verticai ic no la7840 vertical line &shake - JVC Televison & Video

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6ya6ya
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Posted on Jan 02, 2017

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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

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caroldon
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SOURCE: horizontal line in middle of

Possible that the vertical drive IC has failed . But make sure to test the voltage on the IC as if the voltage is not present on the IC thenthe saem problem can happen andit can be due to a failure of the fusible resistor from the LOT.
So check this before you replace the IC.

Posted on Sep 24, 2010

  • 8909 Answers

SOURCE: DEAWOO TV Model no DTC

If you have a bright vertical line down the screen you have an "S" correction fault. Usually there is a small choke that gets a dry joint under it.
Check for dry joints.

Posted on Jan 04, 2011

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1 Answer

I want to ic la7840 circuit diagram


https://www.google.com/search?q=la7840+circuit+diagram&tbm=isch&tbo=u&source=univ&sa=X&ei=wSFuU_2lIZOdyAScqILIDw&ved=0CCgQsAQ&biw=1920&bih=1104

May 10, 2014 | LG DU-52SZ61D TV

1 Answer

Igo 20"tv using la7840 verticl line


Check all the solder terminals at the vertical output IC. Re-solder all of it by applying a little more solder to each solder terminals. If it do not help you, desolder out the vertical output IC, and check all the related components. Check and replace damaged one/s. If you wish to get some details; check the site linked here. Viewing it in "Mosaic" will make surf easy. Surf the site with patience. Pull up older posts. Surf the site with patience.
http://electronicshelponline.blogspot.com/

Apr 10, 2014 | Televison & Video

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

Horizontal lines across TV screen Pansonic CT 35g25


Check its vertical output section circuit for any component damage or loose soldering terminals. Check the solder terminals of the vertical output IC. Resolder all the suspected solder terminals by applying al little more fresh solder, without making any solder bridge short in between adjacent solder terminals.
If this do not help you, replace the vertical output IC. Lose of Vertical Scan is the problem of your TV.

Aug 04, 2012 | Panasonic CT-35G25 TV

1 Answer

My sony tv model no. kv-ha21m80 is on standby mode & its LED is blinking four times that means it has some problem in vertical section.But when I tried to check voltages of its vertical IC AN5522


Disconnect Vertical supply and so that your Horizontal system run check all voltages before connecting vertical again ...should the protection come in again when vertical connected ...replace Vertical Ic and safety resistor in line

Apr 21, 2012 | Televison & Video

1 Answer

DEAWOO TV Model no DTC 2975 vertical line i want to know that vertical ic number b,cos of that ic is burn & blast,i can't fine out.


If you have a bright vertical line down the screen you have an "S" correction fault. Usually there is a small choke that gets a dry joint under it.
Check for dry joints.

Jan 04, 2011 | Televison & Video

1 Answer

My Panasonic TC-21Z88RBN doesn’t displays the total picture vertically ,when the picture is display it like not in the center of the screen sum of it is disappear in the bottom


Hello

Your TVs vertical output section has the fault. You just open your TV after disconnecting it from the AC mains wall socket, and locate the vertical output section. This section uses an Ic marked as part [IC 401] on the board and its number is LA7840. Just look for any loose soderings around its components legs, and the solderings at the IC legs, which has 7 of them. The IC stated above will be screwed onto a heatsink to radiate heat out of it when it works.
If all soldering point are fine, come towards the IC legs and measure the voltages at each leg. The voltages must be
pin 1= Ground
pin 2= 12.6
pin 3= 24.7
pin 4= 4.4
pin 5= 4.4
pin 6= 24v [vcc]
pin 7= 1.8
All voltages stated above are DC voltages with respect to ground. If any of this voltage is missing, find out the reason for that. If all of them are noted abnormal, IC may be defective, and replace it.
[vcc] stands for main input voltage to the IC.
If you need any more assistance, feel free to contact me through Fixya. Ok.

Dec 07, 2010 | Panasonic TC-21Z88R 21" TV

1 Answer

Horizontal line in middle of the tube.. LA7840 vertical ic


Possible that the vertical drive IC has failed . But make sure to test the voltage on the IC as if the voltage is not present on the IC thenthe saem problem can happen andit can be due to a failure of the fusible resistor from the LOT.
So check this before you replace the IC.

Sep 24, 2010 | Televison & Video

1 Answer

Vertical 1 line


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

Dec 13, 2007 | Televison & Video

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