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I have no vertical deflection how can i fix this?

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  • Sansui Master
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Check the grounds around the 7 pin ic. [this is the vertical ic] located on a heat sink. Resolder these. The first reason they have rings is that you have two or three bad caps near this ic. Pay close attention to the 35volt 100mf cap in front of the ic. I cannot remember the location numbers now. Been sometime since I repaired this model. Then there are two 50volt 47mf that may be replaced. These are questionable, if you can find them they are very small but not surfacemounted. They are behind the ic. and you can replace . Always remember to correctly insert them with their polarity grounds.

Posted on Jul 12, 2009

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On screen horazantal white line


May not be an easy fix:

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

May 27, 2014 | Samsung Televison & Video

1 Answer

Hello, I have a student in our electronics class that has an Emerson EWF2702. Problem is the tv has sound but only a white line will show up on the screen when it's turned on. Can you provide a diagram...


Hello
A single white line across the screen denotes the absence of vertical sweep. Its vertical output section, or its vertical deflection coil section [integrated to deflection coin assembly fixed at the neck of picture tube] may got damaged. Deflection coil faults are very rare. You just look into vertical sweep output and its dirve section. Check for all voltages. Check its main supply voltage. The output voltage must be almost about the half of its supply voltage. Usually most of the modern telivisions uses an IC in this stage. Sometimes that Ic may be faulty. Check it also. Schematic diagram of Emerson is not available with us; and is ver difficult to get. If you wants any further assistance contact me. gopakumarg43@ymail.com.

Oct 18, 2010 | Emerson Televison & Video

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

When we turn on the VS-5051 we hear a click, but get no power led, no sound, and only a thin white line across the screen. Can you tell us if this is worth fixing?


Hello: The problem with your television is that you have lost vertical deflection. The white line indicates you still have horizontal deflection, and the answer to your question. Is it worth fixing? My answer is yes This is a common problem that happens to all tube type televisions at some time in the life span of the television. The part that has failed is the vertical deflection IC and or the voltage to power the IC is missing, But the most common parts to fail in the vertical section are pump up capacitors on the output stages of the vertical signal. Parts for this problem are very cheap. IC around $12.00, Capaictors around .58 cents each, may require two of the (Capacitors that is). Highly recommend repairing this Set. Should not cost you more than $150 in labor and parts to repair this set.

Sep 25, 2009 | Mitsubishi VS-50501 50" Rear Projection...

1 Answer

My tv keeps changing picture size


Does it change height? If so that is the problem with the vertical deflection. It is very rare for the picture to change in width since the is the horizontal deflection circuit, which also provides power, and instead of width problem you would have a dead TV. lol
Ok your problem is with the vertical deflection I assume. The cause could be a bad capacitor, The vertical output amplifier, or just a simple bad solder connection. If you want to know how to fix it let me know, but I have to say it is not that easy. In technicality I would rate it 8 out of ten.

Aug 12, 2009 | Mitsubishi Televison & Video

1 Answer

How do you fix a white horizontal line across top of Orion TV?


Hello eatkinson,

This denotes a problem with the vertical deflection circuit. This is more then likely the result of the vertical coupling capacitor failing. You will need the schematic diagram of the TV to find the capacitor in question. it is located between the vertical output stage and the vertical deflection winding of the yoke transformer. In addition check the continuity of the vertical winding of the yoke transformer this can cause the same problem. In any event the problem is that the vertical deflection signal is not getting to the yoke transformer or the yoke transformer is malfunctioning.

I hope this helps,

Thank you,

Shuttle83

http://www.electron-age-technologies-llc.com

Apr 08, 2009 | Orion1934 19" TV

1 Answer

I HAVE 4 FLASHES


4 times, Diagnosis: Vertical deflection stopped. Possible causes: +- 15V is not supplied. (D board), IC8003 is faulty. (A board) Symptoms of the problem: TV has entered standby state after horizontal raster, Vertical deflection pulse is stopped, Power line is shorted or power supply is stopped.

Sep 24, 2008 | Sony KP-53V85 53" Rear Projection...

1 Answer

HYUNDAI COLOUR TV HCT3740 (37CM)


No vertical is always an affordable fix.
- failed (dried out) electrolytic caps in the vertical circuit
- failed vertical IC
- failed power to the vertical circuit.
Hope Ya Fix It

Feb 07, 2008 | Televison & Video

4 Answers

Horizontal line in the middle of the television


From your description of the problem, there seems to be a Cold solder in the Vertical Oscillator or Deflection Coil circuits.
If you know Solid State electronics, and are good with a soldering Iron, sure u can do this yourself.
U gotta trace the Vertical section components and locate the cold solder. In most cases it will be a loose connector from the Deflection coil to the main PCB.Also check for the soldering of the Vertical output IC.

Oct 19, 2007 | Philips Magnavox 27MS343S 27" TV

2 Answers

20 inch T.V.


You have a bad vertical output IC, or the sweep power supply that drives the IC is bad. Your going to need the service schematic diagram and the know how to fix solid state electronics.

Sep 01, 2006 | Durabrand DWT1905 TV

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