Question about Toshiba 42H81 42" Rear Projection Television

1 Answer

Verticle wavy lines, worse when cold - Toshiba 42H81 42" Rear Projection Television

Posted by on

Ad

1 Answer

  • Level 3:

    An expert who has achieved level 3 by getting 1000 points

    All-Star:

    An expert that got 10 achievements.

    MVP:

    An expert that got 5 achievements.

    President:

    An expert whose answer got voted for 500 times.

  • Master
  • 1,099 Answers

Hello,
This is a vertical deflection problem - possibly a bad capacitor, bad connection, flyback/pumpup diode, or other component. None of these should be very expensive (in a relative sort of way).

If the symptoms change - particularly if they become less severe - as the set warms up, a dried up electrolytic capacitor is most likely. If they get worse, it could be a bad semiconductor. Freeze spray or a heat gun may be useful in identifying the defective component.

It is often easiest to substitute a good capacitor for each electrolytic in the vertical output circuit. Look for bad connections (particularly to the deflection ports), then consider replacing the vertical output IC or transistor(s).

A missing power supply voltage, defective vertical output IC, or a component associated with it is likely bad. A bad connection or blown fusable resistor may be the cause of a missing power supply voltage.

The following are NOT possible: CRT, flyback (except possibly where it's the source for a missing voltage but this is more likely just a bad solder connection at a flyback pin), tuner where the controller is at fault - see the sections on these specific brands. I am just trying to think of really expensive parts that cannot possibly be at fault.
Hope this will help..

Posted on May 26, 2010

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.
Goodluck!

Posted on Jan 02, 2017

Ad

Add Your Answer

Uploading: 0%

my-video-file.mp4

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

×

Loading...
Loading...

Related Questions:

1 Answer

Wavy horizontal lines across the screen


It sounds that the main power supply section to your TV has the fault. The horizontal thik lines that appears crawling down across the screen should be of video 'HUM'. Have you replaced the main filter capacitor at the power supply section? If not, replace it along with the main rectifier. The AC power is rectifed by a bridge and applied ot this main filter capcitor. It will have a capacitance value between 120 to 350MFD 450VDC. Check this section. Measure the rectifed DC voltage acorss this main filter capacitor. It should be around 350VDC, if your home power supply line is 220VAC. If it is 110AC, this DC voltage will be around 165VDC; and it should be. If rectified DC voltage found lower than the input AC voltage, replace the rectifier bridge. In some sets, this bridge section have four diodes. Some other circuits, a bridge rectifier stalk may be used.

May 20, 2012 | JVC AV-27050 TV

1 Answer

Jumping lines throughout the screen affecting quality of picture


You didn't say weather the lines are verticle or horizontal, but if the lines are verticle check the circuit for a weak capacitor or if the lines are check the horizontal circuit for a weak capacitor. During your check check for cold solder joints, idf you come across ant re-solder then. Good luck.

Jan 27, 2011 | Pioneer PRO-520HD 53" Rear Projection...

1 Answer

Samsung 50 HLN5065WX has wavy lines on analog input


this is an inherit problem of this set - - search 'wavy line' and you'll see many samsung sets have this - there is no cure ! use the set with component or hdmi good luck

Jul 16, 2010 | Samsung SP50L6HX 50" DLP HDTV

2 Answers

Verticle line down the middle of lcd monitor.


This is a common problem with LCD screens. It is pixel line damage and the screen is permanently damaged and is not repairable. It will probably get worse. The only answer is to replace it

Oct 01, 2008 | Toshiba Satellite P30 P35 Series Notebook

1 Answer

I don't know what the light that came on means.


That light indicates you are low on coolant. Make sure the engine is completly cold and remove your radiator cap, fill to top with new coolant, also fill reserve bottle to cold line.

Hope this helps

Jul 07, 2008 | 2004 Pontiac Sunfire

1 Answer

Black line in screan


Hi sony with line is a verticle ic la7838 is one of the verticle ics that go in some sony . or cold solder joints on ic if you tap it and picture come back



thanks DOCTOR VIDEO.

Apr 27, 2008 | Televison & Video

1 Answer

Picture Jumps/flashes for first 5 minutes


There is a module called a hyper board that is vertically mounted near the jack panel. Inside the module are 10mf/25v capacitors they are grtting weak. The module is fully shielded and pluggs into a socket. the module has 4 tabs (2 on each end) that must be unsoldered before it can be unplugged. This repair should be done by a qualified technician. The caps are surface mounts and very small. Unless you have excellent soldering skills and a rock steady hand DO NOT ATTEMPT to repair this problem on your own.

Nov 16, 2007 | Toshiba 57H81 57" Rear Projection...

1 Answer

Monitor settings


try to adjust with the panel button . bye

Sep 23, 2007 | HP Compaq FS7600 17" CRT Monitor

2 Answers

Verticle lines on screen


This is a very easy fix. Your cable box is not grounded correctly. To fix this you need a AC Plug adapter. This will change your TV ac plug from a 3 wire to a 2 wire. This may sound funny, but trust me on this. I have fix a lot of TV in NY doing just this.24001fc.jpg

Sep 10, 2007 | Samsung HP-R4252 42 in. Plasma HDTV

1 Answer

Sylvania 6427FF TV displays wavy verticle lines at top of the screen.


I would suspect defective filter capacitors in the sweep circuits as well as the power supply source voltages.

Aug 07, 2007 | Sylvania 6427FF TV

Not finding what you are looking for?
Toshiba 42H81 42" Rear Projection Television Logo

94 people viewed this question

Ask a Question

Usually answered in minutes!

Top Toshiba Televison & Video Experts

The Knight
The Knight

Level 3 Expert

74468 Answers

Donald DCruz
Donald DCruz

Level 3 Expert

17130 Answers

Jaime Hernandez

Level 3 Expert

2318 Answers

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

Answer questions

Manuals & User Guides

Loading...