Question about TruTech PM1919BXA1 19 in. LCD TV

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Bad vertical output IC - Only a horizontal line on CRT

Trutech T2000-D, vertical output IC burnt to the point that no markings or part number are legible. Unable to locate schematic or service info on-line. Any suggestions?

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Posted on Dec 31, 2008

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Horicantal line ic7840,tb1226


Vertical scan output failure. Check and repalce the vertical scan output IC. Horizontal scan is OK. That's why you see a horizontal line instead of raster. Refer its circuit diagram [Schematic] to know more about the IC number. 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/
Type in the brand name of your device, in the search box [at the top right] of the display window and the Search will start at once as you type in, and will show you all the related posts. It will make surf easy.

Feb 20, 2015 | Flat Panel Televisions

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Just blue thin lines Flat Panel Televisions


<span>First Try:<br />HI...<br /><br />The HOT transistor ( Horizontal Output) has failed<br /><br />Expect to pay about $100 to get it fixed ( If you bring it to a tech)<br /><br />OR:<br />This is vertical problem. The tv have a cold solder in vertical ic or ic is bad.</span>

on May 08, 2011 | Flat Panel Televisions

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One horizontal line on TV


Either bad solder connections on the vertical output IC or bad part in that circuit, IC or something else. I presume it is NOT a flat panel set but has a picture tube as no model number is listed.

Dec 15, 2012 | Flat Panel Televisions

2 Answers

HORIZONTAL LINE ON SCREEN & NO PICTURE,SOUND IS GOOD


Hello,
All Plasma and LCD TV have boards that control vertical and horizontal output to their respective areas. They are connected to the screen by ribbon cables. If one of these boards fails all together, has a failed chip, a bad connection, or a bad ground somewhere it will result in a black line in the area of that board. A bad ribbon cable connection on the bottom will result in a vertical black bar though the screen. Many times reseating the connection will fix it, if the ribbon cable has been nicked there could be a severed connection. They an sometimes be fixed, but it is a pain. An yes I have done it, but the bar is gone. The same will happen if the chip that outputs to that area opens. The connectors are the first place to look paying close attention to the cable, they are extremely delicate so great care must be taken if you decide to tinker with em, the usually have lift locks that release them, but it is very easy to wreck em.IF otherwise,The Y-Sustain is a relatively large board out of which go connections to the side of the display; it's therefore closer to either the left or the right side of the display, has at least one rather large heat sink on it and fat power cables connecting it to the main power supply. Often there are fuses on that board - one or more, if they are blown you can try to replace them, but expect them to blow again - usually the whole board needs to be replaced. Good luck in handling the problem.

Aug 11, 2011 | Flat Panel Televisions

1 Answer

My portable tv showing horizontal line on screen. how to find problem in this board


hi if your tv is crt type their is a problem with the vertical section, check the vertical ic if the supply voltage is present. then observe if too hot the ic is bad replaced with new one and then check other part with i9n the vertical section which cause the ic to get bad. hope this will help you good luck.

Aug 08, 2011 | Flat Panel Televisions

1 Answer

Thin horizontal line across screen


Hello
You haven't specifed nothing about the model number or brand name of your flat panel teleivison. i assumes that it to be a picture tube based one and posts this solution before you.
A thin horizontal line across the screen with sound output is OK, is the sympton of total failure of vertical sweep. This may be due to failure of vertical output IC or loose solder terminals of that IC. The vertical output IC will heat up while working, and repeated heating and cooling may make its solder terminals to get loose. Just open your TV, pull out the board that contains vertcial output section, turn it upside down, resolder all the solder terminals of that IC by applying a little more solder, without making any solder bridge in between terminals. Check the voltage to the vertical output IC also. If this resoldering method does not help you, replace the vertical IC itself with same type and number will solve your TVs problem. OK.

May 07, 2011 | Flat Panel Televisions

2 Answers

Horizontal ine in CRT tv


Failure of the horzontal linerity coil, possible dry soldering on the board of the components- resistors and capcitors- in the horizontal coil circuit . Also failure of the deflection coil- YOKE- in the crt. So check the coils and the circuit around this section as the rest of circuit seems OK.

Apr 06, 2011 | Flat Panel Televisions

2 Answers

I have a toshiba regza 42inch lcd for six weeks and this morning when I switched the tv on a long dark line appeared on the screen. Before I go to currys can some one please tell me whether it's something...


Hello,
you can do this yourself by opening the back cover of the television
CAUTION: To prevent damage to the CRT phosphors, immediately turn down the brightness so the line is just barely visible. If the user controls do not have enough range, you will have to locate and adjust the master brightness or screen/G2 pots.

A single horizontal line means that you have lost vertical deflection. High voltage is most likely fine since there is something on the screen.

This could be due to:

Dirty service switch contacts. There is often a small switch located inside on the main board or perhaps accessible from the back. This is used during setup to set the color background levels. (On some sets, this is located on the CRT neck board and may be a jumper plug or other means of selecting service mode - not an actual switch.)

When moved to the 'service' position, it kills vertical deflection and video to the CRT. If the switch somehow changed position or got dirty or corroded contacts, you will have this symptom. Flip the switch back and forth a couple of times. If there is some change, then replace, clean, resolder, or even bypass it as appropriate.

Bad connection to deflection yoke or other parts in vertical output circuit. Bad connections are common in TVs and monitors. Check around the pins of large components like transformers, power transistors and resistors, or connectors for hairline cracks in the solder. Reseat internal connectors. Check particularly around the connector to the deflection yoke on the CRT.

Bad vertical deflection IC or transistor. You will probably need the service manual for this and the following. However, if the vertical deflection is done with an IC, the ECG Semiconductor Master Substitution guide may have its pinout which may be enough to test it with a scope.

Other bad parts in vertical deflection circuit though there are not that many parts that would kill the deflection entirely.

Loss of power to vertical deflection circuits. Check for blown fusable resistors/fuses and bad connections.

Loss of vertical oscillator or vertical drive signals.

The most likely possibilities are in the deflection output stage or bad connections to the yoke.

Jun 01, 2010 | Toshiba REGZA 42 in. Flat-Panel LCD HDTV

1 Answer

Vertical failure on this chassis. what is the part # for the replacement Vertical Amp IC. And do you recomend changing any of the capacitors on the output lines?


This unit is listed in the flat panel section. If it is indeed a flat panel TV it doesn't have a vertical output IC. If it is a crt type you need the brand, and exact model number to have any hope of getting a part number.

Apr 12, 2010 | Flat Panel Televisions

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