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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.

Posted by Anonymous on

  • Anonymous Aug 19, 2006

    No numbers or letters at all on the IC. The IC had a melt-down. This brand TV is used mainly in commercial and educational...not sure if it's manufactured by someone else...I can't find anything else on it except it was manufactured in late 2003 and has a chassis number of: C-29D5

  • Anonymous Dec 09, 2008

    Found the answer, the part is a TDA-8351 Philips IC. There is also a fusible resister that fails - not sure of the value but a guess would be .82 ohms @ 2 watts. And yes this company is no longer selling TVs or monitors in the US. I'm not even sure if they are in business anymore - anywhere. Lots of these TV/monitors still out there.

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Anonymous

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  • Master
  • 3,130 Answers

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

  • Anonymous Aug 19, 2006

    Go tohttp://www.net-tv.net/ they have info there on who and where to contact. Good Luck

  • Anonymous Aug 19, 2006

    oops sorry i was given the wrong info. i will find and repost.

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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. http://electronicshelponline.blogspot.com/
You can get some details there; I'm sure.
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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.http://electronicshelponline.blogspot.com/
Horizontal line fault to CRT based TVs are given.
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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
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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).
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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.
2helpful
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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
Eric

I’m happy to help further over the phone at https://www.6ya.com/expert/eric_ab7c09ec01841771

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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.
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No vertical deflection -Horizontal line on tv

check or re solder the ic of vert. defl.
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Model CF1926A TV with insufficient vertical height. I replaced c308, c305, c301, c315. voltage was missing from ic501, pin 29; restored with replacement of c301. no help to vertical. voltage was missing...

I think you missed one cap. Look for another 1ufd cap close to the jungle chip. It will have the circuit designation in the 300's like the others in the vertical circuit. It is just not located close by. I think that one will fix it.I don't have the service data with me so I can't give you the exact designation.
Dan
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