Question about Toshiba MW27F51 27 in. TV/VCR/DVD Combo

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Vertical output transistor

When I checked the parts list for this tv, there was no transistor with that name. I have tried several sites to get the part number with no success.
Any ideas besides throwing the tv away?

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Ic401 was shorted it takes la78041. But it also had two shorted diodes #30b,which crosses to a nte5035.
my set had retrace at top after it was fixed ,which in my case needed 2 caps c421 4.7/50v and c427 100/35v . change both at same time. also in my search of the board c402 4.6 /160v had been puffed up either from the i.c. shorting or another potential problem so change while you are in there as well as resoldering the whole vertical/ horizontal circuit board. any questions call me randy at 563-579-9473 thanks

Posted on Jan 26, 2009

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Black tv screen with line across


Vertical output IC has failed. It should be replaced. You haven't given the brand name and model number here. I assume that it is a Toshiba TV. If so, Visit this site for more details. Type in the site name "Electro-help" either Google or Yahoo search box [not in the address bar of your browser], and click search. It is an electronic equipments service help site. All details you want are there. Note the position of hyphen in between words in site name, when you type it in. The site will appear as it is in web; subtitled as service help to electronic home entertainement equipments.

Pull up older posts. You can gather all details. Sometimes, clicking on the ads by the side and bottom of each post might give you more details.

Pull up older posts.

May 28, 2012 | Toshiba MW27H63 27" TV/VCR/DVD

1 Answer

Single line across set(horizonal)


A single horizontal line on your CRT Television indicates that the Vertical Drive Transistor has failed. Not as large and easily accessible as the Horizontal Output Transistor, the VDT should be fairly easly to locate and replace.

USE CAUTION INSIDE YOUR TV CASE! EXTREMELY HIGH VOLTAGES CAN KILL YOU!

Dec 13, 2010 | Panasonic Combination Televisions

1 Answer

Screen Doesn't Appear, power comes on but NO Picture,pls help


There are several possibilities that come to my mind about this problem.

Firstly, most problems come down to power, or rather a lack of - because of a component breakdown.

1]...It may sound obvious, but there could be a problem with the unit's internal power supply module that regulates the supply to the HT (High Tension) side of the circuit; It could be
a]...a transistor;
b]...diode;
c]...safety resistor;
d]...Or, but unlikely, a fuse.

this is the part of the main board that contains the line output transistors, line output transformer (LOPT) etc, & supplies the extremely high voltage (typically thousands of volts) to the crt (Cathode Ray Tube).

2]...It could be the line output transistor, or another component - such as a safety resistor - in the line out stage.
The line output transistor would be located on the heatsink, very close to the LOPT.

3]...It could also be the line output transformer;
a]...My first check for this would be for dry solder joints on the LOPT, on the underside of the main board.

I must stress, as a retired tv engineer myself, there are very dangerous voltages inside television sets, & I talk from experience - I've had some nasty shocks in my time, & it only takes a few milliamps of current to kill you, if it goes through your chest (Up one arm & down the other).

Even after a tv has been unplugged from the power socket, on the wall, it can contain dangerously high & possibly fatal voltages.

So please, DO NOT attempt this repair yourself, unless you are qualified to do so; either ask someone who you know, who is qualified, or take it to the tv repair shop.

I hope this has been of help to you.

Thanks,
Steve.

Oct 01, 2010 | Combination Televisions

1 Answer

Thin white horizontal line across otherwise black screen


Hello,

CAUTION: To prevent damage to the CRT phosphors, immediately turn down the brightness so the line is just barely visible. If the user controls do not have enough range, you will have to locate and adjust the master brightness or screen/G2 pots.

A single horizontal line means that you have lost vertical deflection. High voltage is most likely fine since there is something on the screen.

This could be due to:

Dirty service switch contacts. There is often a small switch located inside on the main board or perhaps accessible from the back. This is used during setup to set the color background levels. (On some sets, this is located on the CRT neck board and may be a jumper plug or other means of selecting service mode - not an actual switch.)

When moved to the 'service' position, it kills vertical deflection and video to the CRT. If the switch somehow changed position or got dirty or corroded contacts, you will have this symptom. Flip the switch back and forth a couple of times. If there is some change, then replace, clean, resolder, or even bypass it as appropriate.

Bad connection to deflection yoke or other parts in vertical output circuit. Bad connections are common in TVs and monitors. Check around the pins of large components like transformers, power transistors and resistors, or connectors for hairline cracks in the solder. Reseat internal connectors. Check particularly around the connector to the deflection yoke on the CRT.

Bad vertical deflection IC or transistor. You will probably need the service manual for this and the following. However, if the vertical deflection is done with an IC, the ECG Semiconductor Master Substitution guide may have its pinout which may be enough to test it with a scope.

Other bad parts in vertical deflection circuit though there are not that many parts that would kill the deflection entirely.

Loss of power to vertical deflection circuits. Check for blown fusable resistors/fuses and bad connections.

Loss of vertical oscillator or vertical drive signals.

The most likely possibilities are in the deflection output stage or bad connections to the yoke.
Hope it works well...

May 28, 2010 | Akai CFTD2083 20 in. TV/VCR/DVD Combo

1 Answer

The picture went out. Still have sound.


Hello,

CAUTION: To prevent damage to the CRT phosphors, immediately turn down the brightness so the line is just barely visible. If the user controls do not have enough range, you will have to locate and adjust the master brightness or screen/G2 pots.

A single horizontal line means that you have lost vertical deflection. High voltage is most likely fine since there is something on the screen.

This could be due to:

Dirty service switch contacts. There is often a small switch located inside on the main board or perhaps accessible from the back. This is used during setup to set the color background levels. (On some sets, this is located on the CRT neck board and may be a jumper plug or other means of selecting service mode - not an actual switch.)

When moved to the 'service' position, it kills vertical deflection and video to the CRT. If the switch somehow changed position or got dirty or corroded contacts, you will have this symptom. Flip the switch back and forth a couple of times. If there is some change, then replace, clean, resolder, or even bypass it as appropriate.

Bad connection to deflection yoke or other parts in vertical output circuit. Bad connections are common in TVs and monitors. Check around the pins of large components like transformers, power transistors and resistors, or connectors for hairline cracks in the solder. Reseat internal connectors. Check particularly around the connector to the deflection yoke on the CRT.

Bad vertical deflection IC or transistor. You will probably need the service manual for this and the following. However, if the vertical deflection is done with an IC, the ECG Semiconductor Master Substitution guide may have its pinout which may be enough to test it with a scope.

Other bad parts in vertical deflection circuit though there are not that many parts that would kill the deflection entirely.

Loss of power to vertical deflection circuits. Check for blown fusable resistors/fuses and bad connections.

Loss of vertical oscillator or vertical drive signals.

The most likely possibilities are in the deflection output stage or bad connections to the yoke.
Good luck..

May 23, 2010 | Toshiba MW27F51 27 in. TV/VCR/DVD Combo

3 Answers

I have a three year old model pvc2542 tv/vcr combo the picture is just a line in the center of the screen


Bad vertical deflection circuit, unless you have a bad connection (bang on set to set it it fills out for a second) . you will need components replaced such as the IC, capacitors possibly a fuse from the power source to the vertical IC.
If its a bad connection soldering the IC pins is not to hard if you are OK with taking it apart yourself.
gd lk
Eric

Aug 21, 2009 | Combination Televisions

1 Answer

At the top of Viewing screen


I would suspect that the vertical output transistor is getting ready to go.

Sep 23, 2008 | Toshiba MW27F51 27 in. TV/VCR/DVD Combo

1 Answer

Straight line


You need to replace the vertical output transistor. part are available online at www.digikey.com

Aug 24, 2008 | Toshiba MW27F51 27 in. TV/VCR/DVD Combo

3 Answers

Tv toshiba vertical problem


I had white lines 4" thick vertically for about a week, then one day powered the unit up and with in 3 seconds there was a loud pop from the rear or the unit. Any one know what needs to be replaced?

Jan 23, 2008 | Toshiba MW27F51 27 in. TV/VCR/DVD Combo

1 Answer

Several dozen thin horizontal white lines across the top of screen, all channels


These beasts are monsters to get into and service without the proper extenstion cables and a service manual. there are no user replaceable parts inside this set. if you know solid state serviceing, you can try and fix it. There is a bad capacitor or capacitors in the vertical sweep circuit and or the vertical output IC is bad also. If you can solder and unsolder go for it. But if you do not or know how the circuit Works Please find a trained tech to assist you with this repair. Good Luck. PS please do not forget to rate this.

Oct 14, 2006 | RCA 27F500TDV 27 in. TV/VCR/DVD Combo

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