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Vertical def. begins by l783? part burned out tv model 62c812u ic 451 13 pins

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I can't find a listing for the model you posted since it is not a US model. I do know that it is likely to be either LA7837 or LA7838. Check with a Sanyo parts distributor in your area. They should be able to get you both the Sanyo part number as well as the generic number.

Dan

Posted on Sep 09, 2008

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WHAT IS THIS PROBLEM R805 RESISTOR 33 Ohm BURNING how this solvation sharp tv?


Vertical output IC shorted. Replace it. Before replacing it, check all the associated components connected to its terminals for failure; especially for any zener diodes for short. It is most possible case. Refer its circuit digram [schematic diagram] for more details.
Contact any service technician.
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/

Aug 02, 2014 | Televison & Video

1 Answer

Zenith tv,no picture only one line comes across the screen when ever i turn it on (model SM2573BT)


look for the vertical ic at the main board, check for shorted pin or the ic get burned.if the ic get bad you need to check shorted diode near the ic which may the cause why the vertical ic get defective.

Aug 08, 2012 | Televison & Video

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The vertical ic of my jvc tv model no. av f21mx5 are always burn even i replace a new one


Just check the supply voltage input to the vertical IC. If it is more than normal, this type of fault can occur. Just compare this voltage . The TV schematic will help you to find this detail. Check whether the IC is firmly screwed on to its metal heat sink.

Jul 03, 2012 | JVC AV-20020 20" TV

2 Answers

My tv all of a sudden has horizontal lines across the picture.


You have bad grounds on your vertical IC. And you have a bad capacitor or two. I don't recall the actual location of the vertical IC location. I would say it may be U4501 location. Resolder the seven pins of this IC. Now check capacitor locations C4505 which is a 35 volt 220 Mf value, and C4506 which is a 63 volt 330 Mf value.Replace these caps as necessary. Then check the solder grounds at the power supply chip U4101, this chip is a switch mode regulator and may become detached from the board. Resolder these 11 pins and be careful not to short the pins with too much solder. Please note the two pins on the right (separated by a missing pin) are soldered together, this is OK. Now for the biggest challenge. You must pull the bottom shield off the tuner (has the RF connection). Yes, this area can produce the horizontal lines you speak of. When removed, you will see about 15 bad solder connections. This area will require great skill to resolder. The solder on the perimeter of this tuner is very difficult to work with, and you do not want to burn off any traces connecting to out side feeds. You could destroy this board. Now inside the tuner area there will be 5 pins or grounds that will need resoldered. Be careful here and not to burn off the small traces leading to other connections. Replace the tuner shield after complete inspection and soldering. In some cases the eeprom, locationU3201, will need replaced. Might not in your case as you say you can still watch TV and the audio is good. I know this is a lot of information, but this TV can be saved. I have repaired many of these. Thanks for asking and show a few hands of support.

Mar 27, 2011 | GE 31GT660 TV

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I have a GE 31GT740 31" TV That turns itself off and then back on every few seconds. There is now a broken (dashed) white line that goes from the very top center of the screen to the right side. The...


I would be concerned with the vertical IC. This IC has pins that have separated from the board itself. You will note the area under the vertical IC is almost black. It will do no good to resolder this. You will need to replace the vertical IC with a new one. And be sure to replace those electrolytic capacitors near and next to the vertical IC. Bad grounds on the this IC will cause your TV to shut down. Also inspect the rest of the TV board. In some cases the retrace cap will always need resoldered! But please inspect all areas of this board for bad grounds and resolder as necessary! Good solid grounds will give you a dependable set. Thanks for asking and show a few hands of support!

Mar 13, 2011 | GE 31GT740 31" TV

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DeawooTV Model DTC 2975 I want to know about vertical ic number.b,cos i can't fine out the number that ic is burn.


Hello

There are two mumbers used in Dawoo tv as vertical IC.
If used is a [9] pin one number is [TDA 8357J].
If used is a [10] pin one, number is [ LA 7848]
OK.

Jan 05, 2011 | Daewoo Televison & Video

1 Answer

Horizontal bright line sound is fine will sometimes go normal with hit to side of TV


Sound like cold solder joints on the vertical output ic. The vertical output ic is usually a inline 7-9 pin chip that begins with la prefix. Not hard to repair at all just be careful not to touch anywhere near the anode leads to the picture! Basically it will knock the **** out of you. lol..

Oct 17, 2010 | Toshiba CF35E50 35" TV

1 Answer

Toshiba 2938xp crt tv vertical deflection fail and i want diagram


I don't have access to the manuals for your specific model, but vertical failures are usually the result of poor connections at the vertical IC or a defective IC. Look for a small flat IC attached to a heat sink with about 9-11 pins. It may be marked LA7837 or something similar. Resolder the pins first. If that doesnot resolve the problem, change the IC.

Keep us posted,

Dan

Apr 15, 2009 | Televison & Video

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

3 Answers

Missing vertical deflection on philips TV


TDA 8362B IC which have vertical freq.output is at pin no.43. (vert.osc) caution for fixing this problem minimise brightness to avoid crt burn. proceed as follows 1 if you are getting sawtooth at output of ic tda 8362 pin 43 then check 1 supply at vertical output ic from eht. 2 yoke connector loose . 3 check vertical output ic parts. 4 finally vertical ic. please check for normal output from power supply even though fault gets rectified just for protection. good luck.

Sep 22, 2007 | RCA 13R400TD 13" TV

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