Question about Symphonic SC3813 13 in. TV/VCR Combo

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Picture problems the picture on my tv is smushed in a vertical line in the middle of the tv. then the channel and settings are all in black.

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Re: picture problems

You have a vert sweep colapse. Fisrt thing is to get a schematic diagram and find the vert. output Ic and the clamper diode. Measure the voltage on both sides. If its low then its apossibility that the Ic was drawing loads of current and blew out the b+ feed resistor. Look on the schematic and trace back the voltage line from the vert output ic back to the sweep power supply on the secondary of the flyback transformer. check the limiter resistor to the feed and if its open replace the cap right there the resistor as well as the vertical output Ic ALL AT ONCE!!! If you dont you will cause it to go out again in a short time. Good Luck.. If you post the vert part of the schematic I will be more then happy to assist you with this repair.

Posted on May 02, 2006

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Thin white horizontal line across otherwise black screen


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

Vertical line at edge of AV1 channel

hi! he might have adjusted the vertical hold and height including the linearity. normally on the board you would see a trimmer resistor with a label v-hold this is to stop the rolling, v- height for the size of the picture. and linearity for the evenness of the picture from top to bottom.

Aug 28, 2009 | Combination Televisions

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

Aug 21, 2009 | Combination Televisions

1 Answer

Toshiba CX32G60 1/2" vertical inward bow center of video

change the electrolytic capacitors in the vertical section of tv. you do need a qualified tv tech to do this repair for sure

Nov 30, 2008 | Toshiba MW27F51 27 in. TV/VCR/DVD Combo

2 Answers

Quasar model VV2008 tv/vcr

in side the mother board(kit)  there should be vertical IC gone.   check the vertical section  for  the IC number  and  replace it  ,     this  will solve ur problem 


Oct 26, 2008 | Quasar VV2009 Combo

3 Answers

When turned on only gets a straight line of color in middle of screen

You lost your vertical sweep. most likely the vertical output IC or a power supply source is the problem.

Jun 07, 2008 | Panasonic PV-DF2700 27 in. TV/VCR/DVD...

2 Answers

No picture

if there is only one horizontal line you have a problem with vertical deflection section

May 28, 2008 | Panasonic PV-DM2794 27 in. TV/VCR/DVD...

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,

Mar 21, 2008 | Combination Televisions

1 Answer

Horizontal line on screen

The most common problem would be a bad solder joint on the vertical drive IC. It could also be a bad solder joint on the flyback transformer, as it supplies voltage to the vert. stages. If you disassemble the set, please be careful not to get shocked. Discharge the high voltage stages as a precaution.


Feb 26, 2008 | Panasonic PV-DF2004 20 in. TV/VCR/DVD...

1 Answer

Tv repair

You don't have to buy a new tv, it is a fairly simple problem, your vertical ic is blown, and it could be the powersupply to the vertical ic also. To verify, slightly increase the screen voltage, and a horizontal line will appear on the screen, if the voltages is okay, change the ic, but first try resoldering the ic pins. Good luck

Jan 14, 2008 | Philips Magnavox 24MC4306 24" TV/VCR/DVD

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