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Erratic problem sometimes horizontal line only in middle of screen picture is restored when I tap or flex board

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  • Anonymous Sep 19, 2008

    I have a toshiba 32d46 and have the same problem. Is the solution the same for this model?

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  • 372 Answers

Hi.

This fault is very easy to repair.
You will need a soldering iron for electrical work with no bigger than 2mm tip & multicore fluxed solder.
The frame chip requires resoldering in to place.
Ensure tv is unplugged froms mains supply remove the back of set, You will need to get access to the underside of the main circuit board.

The chip you are looking for will be screwed or clipped to a metal
heatsink it will be close to the line output transformer (loptx).
The loptx is easy to find it will be a large grey or black plastic item with a thick red wire coming out the top going to the glass on the tube. it will allso have 2 or more other wires coming out of it going to the pcb on tube.

WARNING do not attempt to remove thick red lead from the glass of the tube it will be holding high voltage.

Once you have found the frame chip it will have 5 or more legs on it just resolder all the legs to pcb.

And thats it jobe done reassemble tv & switch on tap the top of tv if picture is stable you have repaired it. If its not check your soldering carefully & resolder any resistors diodes & capacitors that are close to the frame chip.

http://dysonmanuals.inc.io/

Chris..

Posted on Nov 18, 2007

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2 Answers

TV has a great picture but wont "hold it". Keeps going to a single flat horizontal line across the middle of the screen. Tapping on side of TV used to bring it back but now, nothing. Just a line.


Vertical scan output section circuit fault. Absence of vertical scan causes the single horizontal line on screen. Horizontal scan output section is OK. Contact any service technician to troubleshoot the vertical scan output section circuit. If you wish to get some details; check the site linked here. Pull up older posts.Surf the site with patience.http://electronicshelponline.blogspot.com/
Horizontal line fault to CRT based TVs are given.

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Tap the top of the TV and if the picture comes on in full screen then it is possible that there are DRY SOLDERING points on the board.
use a good iron to touch up the soldering on the vertical and horizontal sections, the driver IC's. get help if you are not able to do the job but it seems a minor job.

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this problem is caused by a faulty ir of cap's . First is c408 on the board it is a 100uf @ 35v i replaced with same uf and @ 50v , Second is a 2.2uf @250v and is c410 on the board replace both and your off to the races.

BEWARE OF HIGH VOLTAGE EVEN IF UNPLUGGED


BROUGHT TO YOU BY WWW.JCEWASTE.COM

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it could be an electrolytic capacitor or the vertical output I.C. in the vertical circuitry,if you remove the rear cover tap on the board in different places and see if the picture fills out or atleast jitters like it might fill out,then it could be just a cold solder joint,then remove the main board and resolder all joints and this should repair the condition you have

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1 Answer

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either your vertical driver or output circuit capacitor(s) defective, try this remove rear cover and with something insulated like a straw prod and poke around the circuit board,sometimes theres a cold solder joint, if picture starts to expand on screen its a solder joint

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1 Answer

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This is usually a bad elect capasitor or a bad solder connection on the vertical IC, The capasitors will be close to the vert chip..Sometimes you can clear problem with a light tap on the TV, if so then suspect bad solder.
Charlie

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1 Answer

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I would suggest to locate a part that looks like the one on this link and re solder all the pins, also check for any high power resistor nearby the IC295890 and put some fresh solder.
Let me know if you need further assistance.

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1 Answer

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The intermittent horizontal line is cause by a loose solder connection in the vertical amplifier IC.
The IC is mounted on a heatsink nearby or around the flyback transformer.
The way to fix this failure is to add fresh solder where you see some brown spots on the circuitry that were cause by components getting hot.
Good Luck.

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Not to me, but it also depends on if you could do this yourself or not. And the area you are in sometimes is responsible for the cost being high.

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