Hey,

I suspect that the solder joints of the vertical deflection IC in my television are dry and/or have broken because a bright line is displayed on my television when turned on. I will try to re-solder the connection. Does anyone have an idea as to what the IC's number is. An online resource has informed me that it is IC451. Is this correct for all televisions?

I have a Samsung television manufactured in 1999.

 

Have a look at these datasheets; see if they might match what you have:
http://www.datasheetcatalog.org/datasheet/sanyo/LA7836.pdf
http://www.audiolabga.com/pdf/LA7837.pdf

In this list: http://www.riddledtv.com/repair/samsung.html
model TXG2547 25", vertical deflection went out, bad solder joint on vertical deflection IC, and they resoldered it to correct the problem. No mention of what the IC was.

 

Hi nDever!
If you are having single horizontal line, this could be due to following
causes:
1) Bad vertical deflection IC or transistor
2) Bad Connection to deflection yoke or some parts in vertical out put
circuit. Check for PCB hair line cracks around the pins of components
such as transformers, power transistors, resistors, connectors etc. Remove
and insert all connectors specially deflection yoke connector and nearby
its pins.
3) Bad service mode switch or its connections.
4) Check other suspicious components of vertical deflection circuit.
5) Loss of power to vertical deflection circuit due to fusible resistors,
fuses or bad connectors.
6) Loss of vertical oscillator or vertical drive
If you are having single horizontal line, first of all reduce brightness to a
minimum either by normal brightness control pot or by screen(g2) pots to
prevent the CRT.
To, locate the components, first find out the model no. of your TV, then
go to the following site and type model no. in the search and then
download the schematic diagram or if you are lucky, the service manual
of your TV :

http://www.eserviceinfo.com/

 

Have a look at these datasheets; see if they might match what you have:
http://www.datasheetcatalog.org/datasheet/sanyo/LA7836.pdf
http://www.audiolabga.com/pdf/LA7837.pdf

In this list: http://www.riddledtv.com/repair/samsung.html
model TXG2547 25", vertical deflection went out, bad solder joint on vertical deflection IC, and they resoldered it to correct the problem. No mention of what the IC was.

I found the correct chip and re-soldered its joint; TV works correctly now. Thanks for the datasheets. It didn't match all of the numbers exactly, but it was at least LA78xx.