Question about NetTV DTV-29XF3 29" TV

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No vertical deflection

I am Looking for the part number for the Vertical integrated circuit (single in-line pins). The on-board designation is IC501. The number can not be read directly off of the part as the IC has been damaged.

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Re: No vertical deflection

Never heard of this model/make. Must be a label TV How many pins and whats it start with ie TA-LA?

Posted on Aug 19, 2006

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3 Answers

Picture shrinks to single horizontal line

If you wish to get some details; check the site linked here. Pull up older posts. Surf the site with patience.
You can get some details there; I'm sure.

Mar 17, 2015 | Standard (CRT) Televisions

2 Answers

TV has a great picture but wont "hold it". Keeps going to a single flat horizontal line across the middle of the screen. Tapping on side of TV used to bring it back but now, nothing. Just a line.

Vertical scan output section circuit fault. Absence of vertical scan causes the single horizontal line on screen. Horizontal scan output section is OK. Contact any service technician to troubleshoot the vertical scan output section circuit. If you wish to get some details; check the site linked here. Pull up older posts.Surf the site with patience.
Horizontal line fault to CRT based TVs are given.

Oct 06, 2014 | Standard (CRT) Televisions

1 Answer

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 Standard (CRT) Televisions

6 Answers

Circuit diagram TC-29P20B

A single horizontal line indicates "No Vertical Sweep". It is most often caused by a loose solder joint on the vertical output device, (transistor, or packaged circuit).

Apr 29, 2014 | Panasonic TC-29P22R 29" TV

1 Answer

Panasonic CT-36G34 TV vertical deflection circuit

there is a single ic you need to find, usually location ic301 or 401---it will have between 7 and 13 pins in a single straight row---a generic number is printed on the front---usually begins with a LA but can be different

Locate the chip and gain access to the bottom of the board, the pins on the chip break loose from heat==SOLDER ALL THE PINS BACK AND YOU SHOULD BE GOOD TO GO---its a very common problem in these sets.
12_19_2012_7_41_26_pm.jpgsomething like this with more pins possible--will be attached to metal of some sort to keep it cool.

Dec 19, 2012 | Panasonic CT-36G34 36" TV

1 Answer

I have thin line going across the screen.what could my problem be?

Your tv has lost vertical deflection. This can be often caused by:

- bad connector contacts (oxydized pins) on the deflection coil connector at the picture tube neck or on the circuit board - in or around vertical drive section
- bad solder contacts on connector pins or on any of the components in the vertical drive section or elsewhere on the board (power supply to the vertical drive section)
- faulty or badly soldered vertical drive IC or transistor
- other faulty or badly soldered components in the vertical drive section or in the power supply line for that section

You can read more about this kind of malfunction at:

Hope you can fix it...



Oct 20, 2009 | Standard (CRT) Televisions

2 Answers

H line problem

I think you are describing 'no vertical deflection.' If all you have on the screen is a single horizontal line, the vertical deflection circuit (or IC) has died. Unless you have service documentation on hand, I can't give a part number to replace but this is typically not an expensive failure and if the set was OK before, it is worth having repaired.

Jul 05, 2009 | Sansui 27" TV

2 Answers

No vertical deflection -Horizontal line on tv

check or re solder the ic of vert. defl.

Jun 09, 2009 | Sansui 27" TV

2 Answers

Sharp 25" tv unknown model (no av in)

It is a simple trouble, tv has got dry solder joints in the vertical deflection circuit. Resolder vertical output ic pins and related components, this will be okay.

Dec 17, 2007 | Sharp 25R-S100 25" TV

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