Question about Projection Televisions

1 Answer

I have a 26" Sanyo

I have a 26" Sanyo TV. Its about 9 years old. As I was watching, the screen shrunk to a 1/4 line across the middle of the screen. What might this be and is it worth fixing?

Posted by on

1 Answer

  • Level 3:

    An expert who has achieved level 3 by getting 1000 points

    Superstar:

    An expert that got 20 achievements.

    All-Star:

    An expert that got 10 achievements.

    MVP:

    An expert that got 5 achievements.

  • Master
  • 4,234 Answers

The vertical IC either has bad connections on it or hit has failed completely. These are common ICs and are available for about $12-$20. If you can solder, you should be able to repair this yourself. Open up the back and look for a small flat IC with about 11 pins attached to a heat sink. It will be marked LA7837 or something similar. Try resoldering the pins first. If that fails to resolve the problem, replace the IC. If you have any question about whether or not you have the correct part, post the marking here and I'll confirm the part.

Keep us posted.
Dan

Posted on Aug 19, 2008

Add Your Answer

Uploading: 0%

my-video-file.mp4

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

×

Loading...
Loading...

Related Questions:

1 Answer

Tv shuts off quickly ( 1-2 seconds)


2blink-then 4 blink---------vertical circuit problem


This is a general answer based on error code--problem in vertical circuit then the first thing is to look for ANY signs of Glycol having leaked from one of the picture tubes onto that area of the board.

If you do not know how or what to look for let me know and I will explain.

Vertical circuit deflects picture from middle to top and middle to bottom of screen; if set detects that it shuts set off instantly to prevent a instant BURN MARK from happening on all three tubes this set uses--prevent permanent damage to the screens of the tubes.

Apr 15, 2012 | Projection Televisions

2 Answers

I have had my sanyo flat screen tv for 1 year. The picture on 4 different stations is "snowy", the rest of the channels are fine. On my Sony DVD player I get audio but no picture. It is also 1...


These units are close enough to the warranty end period that I would suggest that you contact Sanyo and Sony requesting warranty service. Talk to a supervisor and be persistant. It may take a few calls.
Keep us posted.
Dan

Apr 18, 2008 | Projection Televisions

2 Answers

LG rear projection colours out of alignment


I have a similar problem with an LG (except my red is the one that is fine) and was able to talk to a tech in some detail about it. The tech prefaced by saying that he had done a hundred or so of these with exactly the same issue. This is very common and the life span of rear projection televisions is not great. Having said that, plasmas and LCDs are also limited in life span mostly due to modern high performance gaming machines which shorten the lifespan of monitors both plasma and LCD alike.

From what I have gathered, this is not a problem that you can easliy sort out. (Of course they would say that though) It involves replacing the digital board which means soldering followed by aligning the lamps which requires quote a lot of expertise.

The part itself apparently costs around $200 Australian and the labour will vary for the cost of the technician but I was quoted that the labour was about the same cost as the part.

Not sure if I would call this solved but I hope it has been at least a little helpful.


May 26, 2009 | JVC AV-56P575 56" Rear Projection...

1 Answer

RCA Projection TV Model HD61W66


convergence power supply not working , there is a mini fuse close to the flyback thansformer , 400miliamp at 250 v resolder the flyback and replace this fuse , there is 3 fuses it look like small squer brown color is the one on the middle , normal repair $200 - 300

May 07, 2009 | Sony Grand WEGA KDF-42WE655 42" Rear...

1 Answer

Black line across screen


module problem take it to a Authorized dealer or a NESDA dealer service manuals hard to say if available since analog TVs are slowly going away and parts well another story might as well go buy a new HDTV set as a CET no garuntee how long it will be analog TV parts will be discontinued. FCC has alot to do with it.

Apr 16, 2009 | Projection Televisions

2 Answers

Panasonic PT-47X54J Not working


I can't tell you how to fix this set, but I can tell you that its not a "lamp" issue as this doesn't have a lamp. Its a 3 picture tube projection TV. the three tubes are in a red green blue format, and average about $175 for each one, not including the labor to install them. your problem, may not be the tube, but just a power supply problem, but there is a chance it is.

Nov 21, 2008 | Panasonic PT-47X54 47" Rear Projection...

1 Answer

No picture


Sound like you lost Vertical Deflection.  Youshould not have a line across the screen because this could destroy the threeCRT Red, Green, and Blue (Picture tubes) if left on to long. There is a protection circuit built in to protect your CRT’s.    Check on the PCB-SIGNALboard (Tuner located on this board) transistors Q-206 Collector should be around 1 Volt Base and Emitter 0V. If the voltage atthis point is greater then 5 Volts the Vertical output IC-401 (Mounted on heat sink 7 pin inline IC) is bad, Part # LA7845.  Pin Voltages should be PIN 1= 0V, 2= 34V, 3= 32V, 4= 3V, 5= 3V, 6= 33v, 7= -6V.  Data sheet located at http://pdf1.alldatasheet.com/datasheet-pdf/view/40357/SANYO/LA7845.html

Jun 22, 2008 | Mitsubishi VS-6043 60" Rear Projection...

1 Answer

WT-46809 Inputs show lines across screen


1. THE SYMPTOM IS BRIGHTER IMAGE ON THE SIDES AND DARKER IN THE MIDDLE. THE PROBLEM CAN BE WITH RED BLUE AND/OR GREEN. CHECK FOR PROPER CONNECTIONS TO THE "DAG COATING AND CONNECTIONS TO PIN 9 ON THE SOCKET OF THE AFFECTED CRT. MAKE SURE THESE GROUND POINTS ARE COMMON WITH CHASSIS GROUND.

Apr 25, 2008 | Mitsubishi WT-46809 46" Rear Projection...

1 Answer

3 curved lines top & bottom/blurred picture


This indicates a convergence problem..convergence power supply probally.. however ive seen 2 other cuicits cause this ..

Sep 24, 2007 | RCA HD52W59 HDTV Projection Television

Not finding what you are looking for?
Projection Televisions Logo

Related Topics:

39 people viewed this question

Ask a Question

Usually answered in minutes!

Top Projection Televisions Experts

Jaime Hernandez

Level 3 Expert

2267 Answers

matt martin
matt martin

Level 3 Expert

1191 Answers

yadayada
yadayada

Level 3 Expert

60960 Answers

Are you a Projection Television Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides

Loading...