Question about Jensen J50-MCTV Television

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The TV has no Vertical Deflection. The yoke resistance readings appear Ok and I don't have a schematic. I'm not certain where the Vertical circuit is on the mother board , the components for that circuit or the voltage readings to look for. I haven't read any shorted or open caps , shorted diodes or open resistors as yet....However, I'm just looking at random.

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Re: NO VERTICAL DEFLECTION - Jensen J50-MCTV Television Portable Televisions

Replace vertical out deflection ic

Posted on Mar 10, 2008

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That model number is a bogen model number. Whats the complete model# as we cant find it if its not complete.

Posted on Aug 19, 2006

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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

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...

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

1 Answer

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

1 Answer

SEVERE VERTICAL DEFLECTION FOLDOVER Only a narrow horizontal stripe about 1'' high appears on the screen

Hello sneakjock,

This is a problem with the vertical output signal. Check the vertical coupling capacitor, the vertical output between the yoke transformer and the vertical output transistor amplifier or (IC output). My odds are on the coupling capacitor being bad.

You will need a schematic diagram and an oscilloscope to check this problem. If you have a background in electronics you will have no problem solving this problem, however if you do not have a background in electronics, I would suggest getting a qualified TV repair technician to do the work on your TV set.

I hope this helps,

Thank you,


Apr 06, 2009 | Toshiba Portable Televisions

1 Answer

Schematic/manual needed for RCA 27V412T Color Television repair

Look for the vertical IC. It should be a small flat IC attached to a heatsink and marked something like LA7837. The IC will have a circuit designation like ICxxx. For example IC301. Check all of the caps in the same circuit (C3xx). One or more are bad &/or intermittant. Start there and keep us posted.

Apr 28, 2008 | Portable Televisions

1 Answer


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


Vertical Foldover/No vertical deflection
D402 (1N4002) leaky

Jan 12, 2008 | Portable Televisions

1 Answer

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...

1 Answer

Repair help

Take a look at the sawtooth waveform produced by the vertical oscillator. There's probably an IC that's producing it. I'd suspect there is a capacitor that is out of tolerance in this circuit on it's way to the vertical deflection yoke. Hope this helps.

Nov 03, 2006 | Panasonic WV-CM1020 Television

1 Answer

Vertical rolling in t.v.

Kamal, You need to find the sawtooth waveform which is generated by the vertical oscilator. There will be a pin on the IC that should show the waveform. If it is not there, then the IC is bad. If it is there, then there is probably an amplifier stage prior to the deflection yoke that has a problem. Either way, the sawtooth wave is not getting to the deflection coil which is why it is rolling. Ther might also be a coupling capacitor which has opened up. Hope this helps.

Sep 13, 2006 | Goldstar GLV-B1000 4 in. Television

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