Question about Toshiba 50A61 50" Rear Projection Television

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Will not stay powered on.

Last December we had the television serviced. A high voltage component was replaced that had something to do with the color. This past April the TV would turn off at random intervals. We would have to unplug the set and wait a few minutes then we could turn it on again. After a few weeks of this it would turn off almost as quick as it would turn on. When it turns off the power light will blink. Unplugging does not resolve the problem. Is there an easy fix or should I get a new one?

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Unplug the convergence yokes and see if set comes on DO NOT leave set on for longer than 2 minites with the plugs out presumming the set comes on, if it does replace 2 x STK 392-110 convergence ICs

Posted on Aug 31, 2007

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Vertical color bars on half of TV, remain on black, 25v instead of 180v on CRT base, from LOT, 135 V ON LOT without CRT base connect, on videocon old CRT TV.


Check and replace damaged component/s at its horizontal scan output section circuit. Check the LOT (Line Output Transformer) too for damage. Replace the horizontal scan output transistor. Check the input voltage to LOT. If the voltage is absent check the feeder resistor; if any. If you wish to get some details; check the site linked here. Pull up older posts.
http://electronicshelponline.blogspot.com/ Type in this key phrase " my service table today " in the search box at the top right of the the home page, to get gathered some pages which has the details of practical experiences of the author of that site. Check all the supply smoothing capacitors. Use of a high quality digital multimeter is recommended. Low quality ones will show false voltage readings, at high frequency.

Oct 19, 2016 | Televison & Video

2 Answers

What do i do if my tv says code 21


somethings wrong with the high voltage circuits and its not allowing the tv to work -to protect you from xrays!

I would send it to a professional repair man or splash out and buy an LED or plasma screen. Don't fiddle with it yourself as the voltages concerned are very dangerous

Jan 08, 2012 | Mitsubishi WS-65807 65" Rear Projection...

1 Answer

Converging problem


This is a rear projection TV that uses three color "guns" in a cathode ray tube . They are no longer converging at the screen. The convergence problem is usually a sign of something else gone wrong with the high voltage.
Do NOT attempt to open this set yourself. This type of TV can have LETHAL voltages inside for WEEKS after it is unplugged. The repair and convergence calibration will require a qualified service technician.

Jan 09, 2010 | RCA HD52W59 HDTV Projection Television

2 Answers

I pressed something on my remote by accident and ever since the tv has been giving me a No Video Signal message (for 4 days now). I can get Menu visuals just fine. My Input is correct on HDMI 1. I get...


Dear,
It is problem you television High Voltage unite,It may be damage,So you can go to repair it by authorized service center.Some of component or high voltage transformer fuse which make high voltage, there are some power transistor also it damage.

Nov 27, 2009 | Toshiba Regza 32LV67U 32 in. LCD HDTV

1 Answer

Tv turns off and on by itself. when turned off, it shows bands/lines of color. what could be the problem?


high voltage regulation problem. when high voltage gets too high protection circit kicks in and shuts off tv. since high voltage is too high, you will see a glow with horizontal retrace lines. if you see red, green, and blue lines your convergence ic's are overheating. suggest local service center

Nov 10, 2009 | Televison & Video

1 Answer

Sharp 19"color tv


change the electrolytic capacitor in the high voltage section.and check the continuity if there are open resistor.

Sep 06, 2008 | Sharp Televison & Video

1 Answer

My tv wont turn on properly


TV's use high voltage to generate the stream of electrons traveling across the picture tube hitting the screen and lighting it up (thus the name Cathode Ray Tube). It takes about 25,000 volts to do this. In normal air, it takes about 1000 volts to jump an inch of air, so the high voltage transformer needs to have good insulation. It generates the voltage through a technique of charging the transformer's magnetic field with a low voltage of about 140 volts then letting it go where upon it flys back out the high voltage side at much high levels (Thus the common name flyback). A most common failure in a CRT type TV is for the insulation to crack in this transformer which is a unique component for each model of TV and leak out the current overstressing the circuit driving it. You can liken it to a little bolt of lightning getting loose in the circuit and has the same sound on a smaller scale.
It would be well to replace your flyback transformer before it gets worse and blows up something else as well. Best done by a professional used to handling high voltage. The picture tube can retain voltage even when the TV is unplugged for some time, and replacing the anode lead (the big red one) can be dangerous.
Hope Ya Fix It!

Feb 20, 2008 | Televison & Video

1 Answer

Blurry Images


Hello paulaspec,

You have a problem with the three factors, and they are screen voltage, focus voltage, and control (focus 2) voltage. Basically these voltages have to be adjusted since the components in this section have aged some. These controls are usually located in the television on the IHVT (Integrated High Voltage Transformer) or as it is also called the flyback transformer. these controls must be adjusted together, along with the color controls. Here is how the adjustment is done (You will need a schematic diagram, a DC volt meter, and a color bar generator to do these measurments):

 

1) turn color and tint fully counter clockwise until you have a black and white picture.

 

2) connect the color bar generator to the TV (ch 3) and turn it on, you should see bars in various shades of gray

 

3) adjust as best as possible the color and tint controls to obtain the color bars on the screen Red Green Blue.

 

4) measure the voltages on the focus, screen and control grids of the CRT and match them to the schematic digram measurements.

 

5) adjust the focus screen and control grids to match the ones on the schematic diagram

 

6) once this is done then you adjust the color controls once again to obtain the red green and blue bars on the TV screen.

 

This should help if the CRT (picture tube) electron guns are still good and if the flyback transformer voltage supply is working.

 

However if you do not have a background in electronics please take the TV to a shop for repairs.

 

I hope this helps,

Thank you,

Shuttle83

Oct 16, 2007 | Sony KV-20M20 20" TV

1 Answer

Light is blinking and tv will not turn on,.


If you say that you've had it only since last december, then it is still under warranty. Get it looked at by the Company Technician.

Aug 24, 2006 | Jensen Q2749J 27" TV

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