Question about LG Flatron F700P 17" CRT Monitor

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RETRACE LINE ON SCREEN AT TOP - LG Flatron F700P 17" CRT Monitor

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If you know some electronics. Then open unit and look in the vertical curcuit for bad capacitor near vertical chip. This is happens because the heat break down capacitors. Also something a little easier the vertical height is set to high. Call the manufacturer and see if a company tech can guide through the procedure.

Posted on May 18, 2011

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Vertical line complant


This is not the vertical line complaint. It is vertical retrace line on screen problem. Might be and IC fault [main chroma] or improper screen voltage. In rare cases this might be of a faulty video output transistor. Anyway, vertical retrace lines are visible on screen, is the problem. If you wish to get more details abut this, just visit the site linked here. Type in " My service table today" as key phrase, in the search box; can be located at the top right of the display window. You'll get an idea about how to proceed.
http://electronicshelponline.blogspot.com/
Look into all gathered posts.

Jun 19, 2015 | Televison & Video

1 Answer

How to repair top horizontal lines problem ?


The fault you say is retrace line problem. Reduce the screen voltage and check whether it vanishes.
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/
Retrace line problems and reasons are described by one post.

Aug 15, 2014 | Televison & Video

1 Answer

Fault finding retrace line on screen ?


Check the video output supply voltage. If it is less than normal, retrace lines will be visible. If the screen voltage is greater than normal, the retrace lines will be visible. You should check all these. 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/
Check these above said voltages at the CRT base card.

Apr 14, 2014 | Sansui Televison & Video

1 Answer

Retarce line


Diagonal retrace lines at the top are usually the result of bad electrolytic capacitors in the vertical deflection circuit most vert. deflection circuits derive operating B+ from a horizontal flyback transformer winding rectified & filtered usually around 24 volts the electrolytic capacitor on this supply loses capacity or may totally go open causing the retrace lines,sometimes other electro. caps in the vert circuit can cause this too, depending on the age of the tv you may find multiple substandard electrolytic caps it's best to test all for capacity & esr. Without knowing more details about your tv brand,model and/or chassis i can't help further.

Apr 14, 2014 | Sansui Televison & Video

1 Answer

Daewoo dtq-206sc have retrace lines


if retrace lines at top of picture the issue is in the vertical circuit--usually a bad filter cap and or the output chip (most of the caps that cause that are 220 uf or 330 uf and connected directly to one pin on the chip.

If retrace lines are across entire screen---likely the master screen control on the Flyback is set too high--causes excessive brightness and the retrace lines.

May 22, 2012 | Daewoo DTQ-20U6SC 20" TV

1 Answer

TOP RETRACE LINE IN THE SAMSUNG CRT TV MODEL CB5081Z


you are going to find a open filter capacitor right at the vertical output chip (usually a 220 uf at 25-35 volts) that is open or low in value.

If the set is run like this it will soon destroy the output chip.

Mar 23, 2012 | Televison & Video

2 Answers

Tv takes up to four minutes to turn on and when it does it has distorted red lines running verticaly across the screen


is there retrace line with red colour then off agian.if yes there is red gun problem which is shorted with ground.you have to do give another way heater ac voltages or replace picture tube.

Oct 16, 2010 | Samsung Televison & Video

1 Answer

Too much yellow does not adjust with normal drop screen adjustments. can i adjust the light beams.on my philips 50"


Normal 0 false false false MicrosoftInternetExplorer4 /* Style Definitions */ table.MsoNormalTable {mso-style-name:"Table Normal"; mso-tstyle-rowband-size:0; mso-tstyle-colband-size:0; mso-style-noshow:yes; mso-style-parent:""; mso-padding-alt:0in 5.4pt 0in 5.4pt; mso-para-margin:0in; mso-para-margin-bottom:.0001pt; mso-pagination:widow-orphan; font-size:10.0pt; font-family:"Times New Roman"; mso-ansi-language:#0400; mso-fareast-language:#0400; mso-bidi-language:#0400;} 1. Turn the green screen control on the Focus Block until retrace lines appear and gradually turn it back
Until the point where you can see the retrace line disappears, just before cutoff.
2. Turn the red screen control on the Focus Block until retrace lines appear and gradually turn it back
Until the point where you can see the retrace line disappears, just before cutoff.
3. Turn the blue screen control on the Focus Block until retrace lines appear and gradually turn it back
until the point where you can see the retrace line disappears, just before cutoff.
4. If the screen still appears too bright after proper G-2 adjustment, you need to adjust the sub-bright adjustment in the service menu
control down until screen cut-off. (Service data Range is usually 21 to 25 in the Service menu, for Sony sets you first go to category "MCP2", & then adjustment item 01( "SBRT")= subright.
For electrical the focus, put on the screen a clear picture of your choice thru an input of the TV set from a DVD, then pause the playback of the DVD Look into each color and rock that color focus control back and forth (turn the control one way then the other way slowing down as the picture goes into the best focus. till the picture looks sharp do each color till they all look in focus. NOTE: it is best to look into each color tube to achieve the best electrical focus. For optical focus please follow the manual lens adjustment in the sets service manual
By Larry Dillon

Aug 27, 2009 | Philips 50P8341 50" Rear Projection...

1 Answer

I have a blue streak going horizontally through the top portion of the screen with shadows behind it. It also looks like the screen is "darker" or more yellow to it.


Your loosing you blue CRT. High voltage adjustment may cure. Horizonal like is called retrace line. Lack of high voltage allows this line to be visible

Jun 23, 2009 | Samsung HC-P4752W 47" Rear Projection...

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