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Check components around the flyback transformer. Especially small value resistors and diodes. Also check the solder joints on the flyback transformer. Please be safe and unplug set when checking parts, also discharge caps or wait a while after unplugging.


Posted on Jan 24, 2008

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Along the top of the picture on the screen is green, how can we get rid of this please.

You are saying about a horizontal green belt acorss the screen at the top. It can be due to main power supply [regulated power supply inside your tv]. Check it whether proper power supply is there or not. Normall it shuld be between 110 to120VDC. Different manufactures have different operating voltages. You should refer to the schematic digram of your tv.
An other cause ca be the lack of voltage, or improper voltage to vertical output section. I thing that you haven't replaced the deflection yoke of your tv till now. If deflection yoke have been replaced, convergence assembly at the neck of the picture tube should be aligned properly to rectify this probelm. Contact an experienced service personal. Ok.

Oct 18, 2010 | Audiovox Portable Televisions

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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...

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.

Oct 18, 2010 | Emerson Portable Televisions

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Have a 29 inch 5 or 6 yr old rca color tv lately we get a colored horizontal bar across the top of the screen and the other day we have fuzzy black lines across the entire 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.

May 30, 2010 | Portable Televisions

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Dear sir,i am having a lg 14''tv set,after i start only horizontal line coming on the screen with clear clarify what will the problem,can i repair in house? Thanking you regards shashi

The vertical deflection module on the tv is faulty. Since you didn't know that (even if it's obvious) it's clear that you don't have the required skill to repair it. Take the tv to someone qualified.

Dec 01, 2009 | Portable Televisions

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Onida 14'' tv on screen showing blue line


Jan 16, 2009 | Portable Televisions

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Stressing out!!

Alba TVs are manufactured in Albainia and the service info is next to impssible to obtain. I would try to troublehoot the deflection circuits. Possibly horizontal output or one of the regulators.

Feb 26, 2008 | LCDDigital LCD7 Television

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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 | Portable Televisions

1 Answer

TV - Thin horizontal line picture on screen

Is this a LCD TV? IF it is it could be something on the video processing board. Let me know the model # and well will go from there. Thank you Jay

Jan 31, 2008 | Portable Televisions

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POP and noothiing

yes it can still be fixed! the pop sound you've heard maybe came from a blown capacitor in the vertical deflection circuits. this symptom, sometimes called the tube light effect, it is characterised by a bright thin horizontal line across the middle of the screen. this symptom is caused by a breakdown in the vertical deflection circuit. hence maybe the trouble maybe in the vertical oscillator, amplifier or output circuits. but if all i have said is not clear to you, better bring it to a qualified tv technician. good luck!

Mar 10, 2007 | RCA E13309 13-Inch Diagonal XL-100 Color...

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Thin white horizontal line center of screen!

The set should have a vertical output IC,You need to change it ,maybe you can check the B+ going to it because it might have opened the safety resistor if the IC went bad.You can check for broken board too unless the set is never move from one place.Be carefull when checking voltages ,there is still high voltage,not much but can num your whole hand.

Oct 18, 2006 | Coby CX-TV1 5 in. Portable Television

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