Question about Samsung TXH1970 TV

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Duaghter ran a magnet over the TV

There is a green section. i dont want to run over it again. (see http://www.fixya.com/support/t102902-magnet_touched_screen ) does it really work?

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The TV requires a manual degaussing. Degaussing is the operation that neutralizes a magnetic field on the face of the tube that causes the color distortion. There is a coil inside the set that does this each time you turn the set on, but it's not strong enough to counter the field the magnet left behind. An external degaussing coil would clear this up, unless the magnet used was so strong it caused phyical damage to the picture tube (but that's unlikely). You could purchase a coil from any of several internet vendors, or call a TV shop in your area to see what they would charge.

(There are some techniques described using a small motor appliance like a hair dryer as a degaussing coil, but generally they don't work reliably. If you are really curious, a quick search using Google or another search site will get you links you can check out.)

Posted on Jan 23, 2009

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Posted on Jan 02, 2017

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My tv has no power, when plugged in the green light flashes constantly about once per second, pressing the power button has no effect. The only voltage coming from the power supply is 5v. Unplugging the...


It sounds like the standby 5vdc is working but the main board is not sending the PS_ON signal to turn on the 12vdc/24vdc power supply section and the BL_ON for the inverter board. I would look at the sch. to see if you have the PS_ON (3.3~5VDC) to turn on the power supply section first. I have a feeling you are having the main board problem.

All the LCD TV's operate just about the same as explain in my guide.
Basic LCD monitor and TV troubleshooting guide:
http://www.fixya.com/support/r5093881-lcd_flat_panel_tv_troubleshooting_guide
http://www.fixya.com/support/r6150077-basic_lcd_monitors_troubleshooting
http://www.fixya.com/support/r7406380-tv_training_manuals
Failed TV and Monitors pictures: http://s807.photobucket.com/albums/yy352/budm
Learn about bad caps: http://en.wikipedia.org/wiki/Capacitor_plague
Parts: www.shopjimmy.com
Parts: www.interliquidparts.com
Capacitors kit: http://lcdalternatives.auctivacommerce.com/Default.aspx he can make you a set of caps.
Or www.digikey.com, just make sure to use caps with low ESR, 105c, high ripple current and long life rating such as PANASONIC FM or FC series.

Aug 12, 2011 | Sharp Aquos LC37D44U 37 in. LCD HDTV

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My question is that my toshiba tv 37inch tv, stop working the tv went blank but the power light is still blinking with no picture. Light still blink green


It may be in safety down mode due to shorted circuits or failed power supply. I would start at the power supply section first by looking for any caps with domed/leaky tops, burnt components, etc.
Please read my guides first;
Basic LCD monitor and TV troubleshooting guide:
http://www.fixya.com/support/r5093881-lcd_flat_panel_tv_troubleshooting_guide
http://www.fixya.com/support/r6150077-basic_lcd_monitors_troubleshooting
http://www.fixya.com/support/r7406380-tv_training_manuals
Failed TV and Monitors pictures: http://s807.photobucket.com/albums/yy352/budm
Learn about bad caps: http://en.wikipedia.org/wiki/Capacitor_plague
Parts: www.shopjimmy.com
Parts: www.interliquidparts.com
Capacitors kit: http://lcdalternatives.auctivacommerce.com/Default.aspx he can make you a set of caps.
Or www.digikey.com, just make sure to use caps with low ESR, 105c, high ripple current and long life rating such as PANASONIC FM or FC series.

Jun 26, 2011 | Toshiba Televison & Video

1 Answer

The Stand By led is red, after become green for 5 seconds and after red again. The power board do not have 24V and 12 V. The 5 VCC is present.


All the caps look good (bad cap can look normal but can have high ESR)?
Are you getting PS_ON from the main board to turn on the 12/24vdc power supply section?
It may have sensed shorted or over current draw so it tsays it shutdown mode. Try disconnecting the power cables to the inverter board to see if the 12/24v will come back.
Basic LCD monitor and TV troubleshooting guide:
http://www.fixya.com/support/r5093881-lcd_flat_panel_tv_troubleshooting_guide
http://www.fixya.com/support/r6150077-basic_lcd_monitors_troubleshooting
http://www.fixya.com/support/r7406380-tv_training_manuals
Failed TV and Monitors pictures: http://s807.photobucket.com/albums/yy352/budm
Learn about bad caps: http://en.wikipedia.org/wiki/Capacitor_plague
Parts: www.shopjimmy.com
Parts: http://interliquidparts.com/

Capacitors kit: http://lcdalternatives.auctivacommerce.com/Default.aspx he can make you a set of caps.
Or www.digikey.com, just make sure to use caps with low ESR, 105c, high ripple current and long life rating such as PANASONIC FM or FC series.

Jun 22, 2011 | Jwin JV-DTV37 37 in. HDTV-Ready LCD...

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I own a Westinghouse L1975NW, Power light Green, Image on screen just very dark, It fit the bill for the common backlight issues that this monitor seems to have. So I did the repairs, (Bought the kit-...


Did you recheck the MOSFETs? You will need a set of test lamps to test the inverter to see if it is the inverter or the lamp assemblies. I am surprised that the kit only contains 2 caps, it should have at least 4 caps, 2 each for the 5v and the 18vdc power supply section. Take the DC reading on the caps to see what you have, take the reading WITHOUT turn on the monitor (the power supply is running al the time), then turn on the montior to see if it maintains the output voltages.

Basic LCD monitor and TV troubleshooting guide:
http://www.fixya.com/support/r6150077-basic_lcd_monitors_troubleshooting
http://www.fixya.com/support/r5093881-lcd_flat_panel_tv_troubleshooting_guide
http://www.fixya.com/support/r7406380-tv_training_manuals
Failed TV and Monitors pictures: http://s807.photobucket.com/albums/yy352/budm/

Learn about bad caps: http://en.wikipedia.org/wiki/Capacitor_plague

Capacitors kit: http://lcdalternatives.auctivacommerce.com/ he can make you a set of caps for you.

Or www.digikey.com just make sure to use caps with low ESR, 105c, high ripple current, long life rating such as PANASONIC FM or FC series.

Apr 05, 2011 | Westinghouse L1975NW Monitor

1 Answer

My picture has a green circular section and a purple one what is wrong please?


That happens with magnets and could be caused by the magnets on the speakers, some green or purple stay forever, but some disappear when you unplug and unplug the tv repeatedly or with other magnets.

Mar 15, 2011 | Bush 2871NTX 28" TV

1 Answer

How to degauss viewsonic vp201b lcd


You do not degauss LCD monitor, it does not use electron beams (affected by magnetic field, if the showdow mask is magnetized, it can mees up color display) for making pictures like LCD.
You only degauss CRT type monitor.
http://en.wikipedia.org/wiki/Degaussing

Basic LCD monitor and TV troubleshooting guide:
http://www.fixya.com/support/r6150077-basic_lcd_monitors_troubleshooting
http://www.fixya.com/support/r5093881-lcd_flat_panel_tv_troubleshooting_guide
http://www.fixya.com/support/r7406380-tv_training_manuals
Failed TV and Monitors: http://s807.photobucket.com/albums/yy352/budm/

Learn about bad caps: http://en.wikipedia.org/wiki/Capacitor_plague

Capacitors kit: http://lcdalternatives.auctivacommerce.com/ he can make you a set of caps for you.
Or www.digikey.com just make sure to use caps with low ESR, 105c, high ripple current, long life rating such as PANASONIC FM or FC series.

Jan 04, 2011 | ViewSonic VP201b 20.1" LCD Monitor

3 Answers

Staining


ahh, that isnt good, the only reason I can say, is, the green stain your referring to, is result of a magnet, or magnetized object coming too close to the screen, thus pulling the color from the screen, depending at which point you put the magnet, it will either be green, red or blue. I dont believe there is fix for it.

Dec 28, 2007 | Pioneer PureVision PDP-503HDE 50 in....

1 Answer

Green Convergence problem


O.K. This is a CRT Projection TV see http://www.tacp.toshiba.com/televisions/product.asp?model=50H82 The Manual is available from http://www.tacp.toshiba.com/tacpassets-images/models/50H82/docs/50H82_om_e.pdf , and this describes the Manual Convergence process, I doubt this will help, but it's step #1. The problem you are describing sound to me like a deflection problem. The electron beam in the green projection 'tube' (a super bright CRT) is probably not being controlled correctly. This can be caused by several things, from least likely to most :) I do not recommend that someone untrained in electronics attempt to service a CRT based television due to the potential for extreme shock or electrocution. That caveat said, here are the possibilities. #1 Physical Trauma: The TV has been shifted moved or bumped hard, and one or more of the fixed permanent magnets used to help convergence has come loose, or the CRT projection tube was damaged. I don't think these TVs use convergence magnets anymore, but it's possible. The green CRT tube failing would be more likely if all four corners were affected, but I've seen a failing CRT affect a single corner/edge before. I believe that this model has projection tubes that are separate from the colored filters, so swapping the tubes around may be possible. I do not have a service manual for this set, and this may be a hazardous operation due to high voltages. #2 Stray magnetic field: Someone dropped a magnet into the TV, and it landed close enough to the green tube to effect it only, or perhaps some other piece of equipment is effecting JUST the Green CRT (clock radio, speaker, badly designed wall wart, etc.). Removing the offending magnetic field may cure the problem. Perhaps the offending magnetic field has been removed, but it's presence is still felt. Try using the degauss function built into the TV set (I can't find one in the manual, but it may be present). You may want to try using a degaussing coil, and see if that helps the problem. Just be careful not to get the coil too close to the base of the projector tubes. #3 Deflection drive electronics: A CRT works by using an electron beam to excite fluorescent compounds on the face of the CRT. To move the electron beam about, a process called deflection is employed. Magnetic coils (the choke) are used to steer the electron beam up, down, left or right. These coils are driven by transistors, and as one fails, you will get an image that starts collapsing in the affected section. On a standard CRT TV, that would mean the entire image is affected, but a CRT projection display uses separate red, green, and blue CRT projection tubes to build the image, so you have three times the deflection, three times the possible transistor failures, and in your case, the odd result of just the green part of the image displaying incorrectly. This problem will probably require a service call, and a electronic board swap, but the problem could be the choke (the magnetic coils) on the green CRT projection tube. Swapping the green tube for another tube could prove if it's the tube or if the deflection electronics that are going out. Again, my feeling is that this is a deflection issue requiring a board swap (I doubt anyone actually does component level repair anymore) Sorry, I don't have a better answer, peace. Paul.

Jan 13, 2007 | Toshiba 50H82 50" Rear Projection...

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