Question about Televison & Video

2 Answers

Half part is display

Sir, half of the picture discribe on display (bottam)vertical ic (LA7840)ok.sub capasitors in vertical section.when i put the memory ic(24C16) then picture discribe top part of the picture in buttom.then i open the srvice manual(OK button from tv front panel&OK button on remote press 6 sec manualopen)All paraentalls r OK.But picture total not to display.Pls give solution. prossaser ic no:TDA9381PS/N2/310955 {21" colour tv LG goldeneye model no:RF21FC80E

Posted by on

  • 1 more comment 
  • Anonymous Jan 07, 2008

    half picture bottom quits

  • rd350_dix650 Nov 12, 2008

    a horizontal line was coming on the bottom of d crt n when i checked d
    vertical section ic LA 7840 was replaced n den picture came up to the
    mid of d crt bu it still wasn't coming at the top , processor ic. no.
    TDA9381PS/N2/3I0955, the resistors n capacitors n the path of the
    signal n supply are ok. plz help me out

  • kamble kailas Nov 17, 2016

    How to set abl lg crt tv tda 9381 ,all ok to touch 1k picture appear.

×

Ad

2 Answers

Replace ic

Posted on Sep 29, 2008

Ad

Abl problem

Posted on Aug 01, 2008

Ad

1 Suggested Answer

6ya6ya
  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

Hi,
A 6ya expert can help you resolve that issue over the phone in a minute or two.
Best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.
The service is completely free and covers almost anything you can think of (from cars to computers, handyman, and even drones).
click here to download the app (for users in the US for now) and get all the help you need.
Good luck!

Posted on Jan 02, 2017

Add Your Answer

Uploading: 0%

my-video-file.mp4

Complete. Click "Add" to insert your video. Add

×

Loading...
Loading...

Related Questions:

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

2 Answers

My picture tube displays all black except one thin horizontal line in the middle. There are no horizontal or vertical adjusts that I can fine. Is the picture tube burned out with just this one line?


Hello
A thin horizontal line across the screen denote that the vertical swep or output has damaged, or there are some loose solder points to vertical output section. Loose solder problems are very common to the vertical output sections of most of the picture tube based TVs. Just open your Tv, and pull out the main baord out of it, which has the vertical output section circuit. You must have some knoldge in electronics to proceed. Locate the vertical output section. usually, this section will be composed of an IC, which will be screwed on to a metal heatslink, to radiate heat out of it when it works. Check whether there is any loose solder terminals at this section, especially look for it at the solder terminals of IC and other components around it.
It is very difficult to detect the loose solder points, as some of them may be so microscopic to detect. Just do, what we do at service table, with this type of fault comes to us. Just resolder most of the suspected solder terminals by applying a little more solder without making any sokder bridge short between adjecent solder terminals.
If this does not help you, check the input voltage to the vertical IC. If found OK, replace the vertical output IC. If there is no voltage to this IC, check the track that brings voltage to that IC. Usually, this voltage will come from one amoung the terminals of LOT [Line Output Transformer]. Check the track, rectifier diode, limiting resistor etc. This is really a skilled work, and you should have all tools for an electronic work, and a skill to detect the faulty component. OK

Sep 16, 2011 | Durabrand DWT1905 TV

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

Philips tv 20pt1782 want service manual


hi! this is shiharan.i am repairing a philips20PT,crt type tv.the problem is that only the lower half(vertical) portion of the picture tube lights up to display pictures.after taking off the back cover i am not been able to locate the horizontal,vertical driver IC.Perhaps the driver section is built arround FET.Please help me.. hi! this is shiharan.i am repairing a philips20PT,crt type tv.the problem is that only the lower half(vertical) portion of the picture tube lights up to display pictures.after taking off the back cover i am not been able to locate the horizontal,vertical driver IC.Perhaps the driver section is built arround FET.Please help me.. hi! this is shiharan.i am repairing a philips20PT,crt type tv.the problem is that only the lower half(vertical) portion of the picture tube lights up to display pictures.after taking off the back cover i am not been able to locate the horizontal,vertical driver IC.Perhaps the driver section is built arround FET.Please help me.. hi! this is shiharan.i am repairing a philips20PT,crt type tv.the problem is that only the lower half(vertical) portion of the picture tube lights up to display pictures.after taking off the back cover i am not been able to locate the horizontal,vertical driver IC.Perhaps the driver section is built arround FET.Please help me.. hi! this is shiharan.i am repairing a philips20PT,crt type tv.the problem is that only the lower half(vertical) portion of the picture tube lights up to display pictures.after taking off the back cover i am not been able to locate the horizontal,vertical driver IC.Perhaps the driver section is built arround FET.Please help me.. hi! this is shiharan.i am repairing a philips20PT,crt type tv.the problem is that only the lower half(vertical) portion of the picture tube lights up to display pictures.after taking off the back cover i am not been able to locate the horizontal,vertical driver IC.Perhaps the driver section is built arround FET.Please help me.. hi! this is shiharan.i am repairing a philips20PT,crt type tv.the problem is that only the lower half(vertical) portion of the picture tube lights up to display pictures.after taking off the back cover i am not been able to locate the horizontal,vertical driver IC.Perhaps the driver section is built arround FET.Please help me.. hi! this is shiharan.i am repairing a philips20PT,crt type tv.the problem is that only the lower half(vertical) portion of the picture tube lights up to display pictures.after taking off the back cover i am not been able to locate the horizontal,vertical driver IC.Perhaps the driver section is built arround FET.Please help me.. hi! this is shiharan.i am repairing a philips20PT,crt type tv.the problem is that only the lower half(vertical) portion of the picture tube lights up to display pictures.after taking off the back cover i am not been able to locate the horizontal,vertical driver IC.Perhaps the driver section is built arround FET.Please help me.. hi! this is shiharan.i am repairing a philips20PT,crt type tv.the problem is that only the lower half(vertical) portion of the picture tube lights up to display pictures.after taking off the back cover i am not been able to locate the horizontal,vertical driver IC.Perhaps the driver section is built arround FET.Please help me.. hi! this is shiharan.i am repairing a philips20PT,crt type tv.the problem is that only the lower half(vertical) portion of the picture tube lights up to display pictures.after taking off the back cover i am not been able to locate the horizontal,vertical driver IC.Perhaps the driver section is built arround FET.Please help me.. hi! this is shiharan.i am repairing a philips20PT,crt type tv.the problem is that only the lower half(vertical) portion of the picture tube lights up to display pictures.after taking off the back cover i am not been able to locate the horizontal,vertical driver IC.Perhaps the driver section is built arround FET.Please help me.. hi! this is shiharan.i am repairing a philips20PT,crt type tv.the problem is that only the lower half(vertical) portion of the picture tube lights up to display pictures.after taking off the back cover i am not been able to locate the horizontal,vertical driver IC.Perhaps the driver section is built arround FET.Please help me.. hi! this is shiharan.i am repairing a philips20PT,crt type tv.the problem is that only the lower half(vertical) portion of the picture tube lights up to display pictures.after taking off the back cover i am not been able to locate the horizontal,vertical driver IC.Perhaps the driver section is built arround FET.Please help me.. hi! this is shiharan.i am repairing a philips20PT,crt type tv.the problem is that only the lower half(vertical) portion of the picture tube lights up to display pictures.after taking off the back cover i am not been able to locate the horizontal,vertical driver IC.Perhaps the driver section is built arround FET.Please help me.. hi! this is shiharan.i am repairing a philips20PT,crt type tv.the problem is that only the lower half(vertical) portion of the picture tube lights up to display pictures.after taking off the back cover i am not been able to locate the horizontal,vertical driver IC.Perhaps the driver section is built arround FET.Please help me.. hi! this is shiharan.i am repairing a philips20PT,crt type tv.the problem is that only the lower half(vertical) portion of the picture tube lights up to display pictures.after taking off the back cover i am not been able to locate the horizontal,vertical driver IC.Perhaps the driver section is built arround FET.Please help me..

Jun 10, 2010 | Lexmark All-in-One Printer with PictBridge

1 Answer

Picture is stretched on top and compressed on bottom


the problem of your tv is in the vertical section,you need to replace the capasitor in vertical section .

Feb 18, 2009 | Konka FL2799U TV

2 Answers

HCL 17" monitor display problem


Hi there ,
It seems that you have a vertical section problem ,It might be possible some capacitor might have gone wrong

Jan 24, 2009 | Samsung SyncMaster 753S 17" CRT Monitor

1 Answer

Half screen showing


ok
keep tv off.
it will only get wors
if sumon dosent work on it soon
the problem you are having in the vertical section of the tv
hav a repairman resolider all conection on the vertical IC and check the serounding componets for falts.

regards daniel.
PS the repair takes me about 15 min.

Jan 13, 2009 | Samsung TXG2746 27" TV

1 Answer

TV screen dislay partial horizontal beam


you had a problem on vertical section of your tv, if can fix it ,change the 100/50 volts capisitor on .vertical section or else all capasitors in vertical section

Oct 07, 2008 | Televison & Video

2 Answers

No picture


if there is only one horizontal line you have a problem with vertical deflection section

May 28, 2008 | Panasonic PV-DM2794 27 in. TV/VCR/DVD...

Not finding what you are looking for?

Open Questions:

Televison & Video Logo

Related Topics:

719 people viewed this question

Ask a Question

Usually answered in minutes!

Top Televison & Video Experts

The Knight
The Knight

Level 3 Expert

75178 Answers

Donald DCruz
Donald DCruz

Level 3 Expert

17130 Answers

Cindy Wells

Level 3 Expert

5343 Answers

Are you a Televison and Video Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides

Loading...