Question about Sanyo DS31590 31" TV

1 Answer

Sanyo DS31590 31" TV vertical deflection

Single bright horizontal line across the screen. Guessing it's the vertical deflection based on some internet research. Any possability of a service switch on this set that may be bad? Anyone happen to have a service manual for it?

Posted by on

1 Answer

  • Level 3:

    An expert who has achieved level 3 by getting 1000 points


    An expert that got 10 achievements.


    An expert that got 5 achievements.

    Vice President:

    An expert whose answer got voted for 100 times.

  • Master
  • 373 Answers
Re: Sanyo DS31590 31" TV vertical deflection

If the vertical is not defective or shorted there is a possiblity of bad solder connections on the vertical ic. If connections are good and has b+ voltage to the chip replace chip which is IC 501 LA7841 or LA7845 and change c511 (decimal point 1 film capacitor)

Posted on Dec 30, 2007

Add Your Answer

0 characters

Uploading: 0%


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


3 Points

Related Questions:

2 Answers

It coming on and after a couple of seconds cut off

Without a brand AND model number or a better description of the problem, any suggestions would be nothing more than a guess.

Unless you are prepared to repair the TV yourself, professionally performed repair, even simplest ones, will probably exceed the cost of a new LCD replacement set.

Due to X-ray and other safety concerns (equipment and/or people), CRT TVs constantly check the voltages and signals required to make a CRT work. A few seconds grace is allowed during start up but after that, any excessive high voltage (real or imagined) or loss of beam deflection circuits will cause the TV to turn off.

Please do the following:
1. Move the TV to a quiet and preferable totally dark room.
Wait until night if necessary.

2. Stand within an inch or closer to the TV screen.

3. Turn on the TV and look and listen for the following:

a. Whoosh sound and/or head hair attracted toward TV screen
Yes. High voltage activated and charged CRT screen.
No. High voltage failed to activate.

b. Hissing or normal sounds from the speaker(s) while set is on.
Low voltage circuits probably okay. Defective low voltage regulator can cause high voltage to exceed limits.

c. Entire screen briefly lit up or single bright spot at center of TV screen

High voltage worked for a moment then the TV shut off due to over voltage or current problems.

d. Brief bright line from top to bottom or single bright dot on TV screen

horizontal deflection circuits bad
vertical deflection circuits ok
TV shut off due to bad deflection/sweep circuit

e. Brief bright line from left to right on TV screen

horizontal deflection circuits bad
vertical deflection circuits ok
TV shut off due to bad deflection/sweep circuit

It would be helpful for you to perform the above "up close and personal turn the TV on test" and report what happened.

Nov 26, 2014 | Standard (CRT) Televisions

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.
Horizontal line fault to CRT based TVs are given.

Oct 06, 2014 | Standard (CRT) Televisions

1 Answer

When I power on my Mitsubishi CS-35313 tv, I only get a thin horizontal line across the center of the picture tube. What could be the problem?

There is a failure in the vertical deflection circuit. Typically there is a vertical output i.c. that provides the deflection vertically. The i.c. itself is a fairly common component to fail. There are some lower power circuits that feed this output device that also could be the problem. When the electron beam in the tube is not deflected vertically it "writes" only horizontally across the center of the screen thus resulting in a single trace. Be careful not to leave this at high brightness for any extended time as it can "burn in" that area of the screen. Unless you are a "techi" this is a job for a qualified technician. Troubleshooting would be in the vertical deflection section of the set. Most of the parts are not expensive in themselves, except for the deflection yoke which sits around the neck of the tube. The cost to repair would typically be the shop labor.

Nov 25, 2009 | Standard (CRT) Televisions

2 Answers

H line problem

I think you are describing 'no vertical deflection.' If all you have on the screen is a single horizontal line, the vertical deflection circuit (or IC) has died. Unless you have service documentation on hand, I can't give a part number to replace but this is typically not an expensive failure and if the set was OK before, it is worth having repaired.

Jul 05, 2009 | Sansui 27" TV

1 Answer

Jvc av-32wf36--have sound no picture

A bright Horizontal Line indicates failure of teh Vertical deflection Circuits.
Get a competent Technician to have a look.

Nov 30, 2008 | JVC AV-27230 27" TV

2 Answers

RCA-single horizontal white line

Your vertical deflection IC is bad.

Nov 04, 2008 | Standard (CRT) Televisions

2 Answers

TV has a thin horizontal line across the screen

intermintence in vertical IC deflection its a job for experienced tech need to look for that circuit and do fine job resolding that IC

Apr 01, 2008 | Sanyo DS31590 31" TV

1 Answer

JVC 27" CRT TV AV-27BP3 display shows single horizontal line

I have a similar problem on my CRT computer monitor (AcerView 76c). It is an old screen and I think it is just at the end of its life, much like your TV. Having some background in physics, I would be pretty sure that the problem is with the cathode ray tube's vertical deflection system. The horizontal deflection electrodes are working while the vertical one is not. This results in a display of a single horizontal line (or in my case, a few superimposed) in the centre of the screen. Where both X and Y (horizontal and vertical) deflectors fail then the electron gun firing would result in a single bright spot in the dead-centre of the screen.

So really, we have no choice but to move on and buy a new set as repair is probably just as, if not more, expensive than replacement with a new device. Seeing as your post was in 2007, I hope you managed to solve the problem.

Best wishes,
SZ (Sydney, AUS)

Dec 24, 2007 | Standard (CRT) Televisions

1 Answer

Sanyo 25" Standard Tube Vertical Deflection Problem

you can proceed as follow to fix it.

  1. reduce brightness to minimum to avoid screen burn.
  2. check voltage on vertical uotput
  3. check yoke connector for loose.
  4. check v/yoke winding.
  5. check v/drive from signal processor to vertical output

now your problem how to find out whether drive is there or not it is very simple even you donot have scope.

you simply touch with screw driver or meter prob  at the poibt where vertical signal is input to vertical stage

if h/line is spreadindg or tries to spread then your output is ok &problem is in drive ckt.

for schematic try given site give model no &download it

hope this will help



Oct 12, 2007 | Sanyo AVM-2557 TV

1 Answer

Tv not working

this symptom, sometimes called the tube light effect, it is characterised by a bright thin horizontal line across the middle of the screen. this symptom is caused by a breakdown in the vertical deflection circuit. hence maybe the trouble maybe in the vertical oscillator, amplifier or output circuits. but if all i have said is not clear to you, better bring it to a qualified tv technician. good luck!

Mar 08, 2007 | Sanyo DS31590 31" TV

Not finding what you are looking for?
Sanyo DS31590 31" TV Logo

360 people viewed this question

Ask a Question

Usually answered in minutes!

Top Sanyo Standard (CRT) Televisions Experts

The Knight
The Knight

Level 3 Expert

66463 Answers

matt martin
matt martin

Level 3 Expert

1187 Answers

Donald DCruz
Donald DCruz

Level 3 Expert

17129 Answers

Are you a Sanyo Standard (CRT) Television Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides