Question about Combination Televisions

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Short circuit. keystone vertical/horizontal

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Cut of 1/2 top and bottom, like vertical size sherink,
I replase vertical out IC stil same,
please repond your tips.

thanks

Posted on Sep 03, 2008

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I have a supersonic 13 in tv dvd combo with picture rolling with horizonal lines


Don't know about yours but TV's these days don't have Vertical, Horizontal, etc controls on the back of the set.
Sounds like you have a problem with Vertical Circuit. Could be a Transistor or Integrated Circuit has failed. They can, sometimes, be replaced but newer devices are not made to be easily worked on.

Jan 30, 2014 | Combination Televisions

1 Answer

I only see one solid horizontal line on my tv


It lost Vertical sweep either due to open fuse resistor feed the Vertical output circuits, failed vertical/oscillator IC, failed Vertical york (on the neck of the picture tube). Those are what you need to check. This is CRT TV, the repair shop will charge at lest $35 to tell you what I just indicate, to repair it iwll more likely to be in $100 range.
Please leave rating if it helps.

Feb 01, 2011 | Panasonic PV-DM2792 Triple Play 27 in....

1 Answer

One line horizontal onscreen


This is well known problem with the Toshiba line, the problem is in the vertical deflection circuits, it causes the picture to collapse to a flat white line, the vertical output ic and two to three capacitors need to be replaced to correct the issue.

Jan 19, 2011 | Toshiba MD20F51 20 in. TV/DVD Combo

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

3 Answers

Stationary horizontal lines


This is a flyback issue and it would need to be replaced. Aslo check the horizontal IC's for faults.

May 25, 2009 | Philips CCA132AT 13 in. Combo

1 Answer

Vertical output transistor


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

Jan 20, 2009 | Toshiba MW27F51 27 in. TV/VCR/DVD Combo

1 Answer

Tv not showing a picture


Hello e26pitts,

If the line is horizontal then it could be a problem in your vertical deflection section, if the line is vertical then the problem is in your horizontal deflection section. Now for a little more detail.

If Horizontal line is present the vertical section of the yoke transformer is nit responding to current flowing through it due to being open, or the vertical coupling capacitor is open, or even the vertical drive transistor might be defective.

If Vertical line is present the horizontal section of the yoke transformer might be bad. Now this gets kind is easy in a way, because the yoke would be the sole cause of your problem here (maybe there is some circuitry doing some horizontal coupling check that to) because the horizontal section controls other functions that would also respond if this were a horizontal drive issue. In any event these problems should be checked by a qualified TV technician, I would suggest that you take the TV to a repair shop to have it worked on.

I hope this helps
Thank you,
Shuttle83

Mar 21, 2008 | Combination Televisions

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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