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Failure of vertical sweep output. Check all the solder terminals of vertical output IC, for any loose solder. It is best to resolder all the solder terminals to this IC, by applying a little more solder to each solder terminals to that IC, without making any solder bridge short in between adjacent solder terminals.
The vertical sweep output has failed. Check the vertical output section circuits for any loose solder terminals. Check all the solder terminals of the vertical output IC. Resolder all the suspected solder terminals by applying a little more solder. If these do not help you, replace the vertical output IC.
Sir the problem of your unit is the thermal intermittent caused by cold solder or dry joints in the solder part of your unit specially the vertical section of your tv.
It is much better if you use a magnifying glass to determine the cold solder joint or dry joints. To fix this just resolder this cold solder using a soldering iron, soldering lead, desoldering pump, Note be sure not to connect separated pin if accidentally connected may caused much damage to the unit hope this help good day and best regards.
There is some loose solder terminals at the vertical output section ot your TV. Just open the TV, locate the vertical output section. There is an IC in the vertical output section, usually screwed on to a metal heatsink to radiate heat away from it while it works. The solder terminals to this IC should be noted for any loose solder points. It is a common fault to most of the CRT based TVs, regardless of brand and model.
Look at the solder terminals of this IC for any loose solderings. This loose may happen, because, this IC will heatup while working, and repeted heating and cooling may make solder points to the terminals of this IC, will cause the fault you reports here.
It will be very difficult to detect these loose solder points, as some of them may be so microscopic to detect. So do what we do on service table. Just resolder most of the suspected solder terminals of that vertical section, including all solder terminals of the vertical output IC and related parts, by applying a little more solder, without making any solder bridge short in between adjecent solder terminals. This mut solve the proble of your tV.
Please adjust with my language, as I'm not an English. My mother toungue is entirely differet to that of English. I only try to exchange my ideas and experience to you. OK.
There is some loose solderings on the chroma board of your TV. This is a normal fault to all kinds of TVs. Some components, like resistors, will heat up during working. Repeated heating and cooling make its solder joints to get loose contacted. Here, your TV works fine for some minutes as you reports and the the problem arises. This is surely due to this kind of mistake. Just see, it is very difficult to locate the exact loose contact points. They will be microscopically minute, that we can't detect it with naked eye. The only remedy, as we techinicans do is, resolder all the suspected solder terminals of that section by applying a little more solder, without making shrot between adjecent soldering points. This is a very sensitive job, as it needs both patience and hand balance to solder. If you can, resolder all the hi-watt resistor solder terminals and IC solder terminals in the chroma section of your TV. You must have a good soldering iron with point soldering bit. If you are confident proceed. Otherwise, leave the job to any expereinced technican.OK
The problem of your teevision is what we called the vertical line problem.The problem is in the vertical section of the board.There are many of cause of that problem.First is either loose connection,the circuit at the vertical section have cold solder so its need to resolder using soldering iron.Second,it maybe no vertical supply,its better to check the 12 volts dc supply of vertical ic output.if thers no supply in the ic,there a open resistor near the flyback.try to replace.Third if theres no loose connection and have a voltage supply the problem is either leaked capacitor or deffective vertical ic output.
Commonly in that problem is the loose connection,try to resolder the verical section.
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.
It is quite normal for the vertical ic to be hot. That is why it is mounted on a heatsink. My question is......are you saying you have intermittant horizontal lines at the top? Or occasionally after warm up you experience one horizontal line across the center? Your vertical IC may need to be resoldered. In this case you will have to decide to just resolder or solderwic the solder around the seven pins, clean with flux remover, wipe dry and reapply new solder. If you have (in most cases) White horizotal lines across the top, you need to replace the capacitors next to the ic. Correct polarization on the caps are neccessary. And dont forget to solder the ic as well. And any ground you may find along the way please resolder. Take two aspirns and call me in the morning!
the problem you are having is a loose solder connection on vertical ic,easy fix only soldering vertical ic.tools you need solder iron and solder. but yes your tv is analog and will require a digital converter.
i have tried this replacement on philips 43 inch. convergence ic part # is STK-392-120. it is mounted on a big heatsink, replace this 2 IC at one time. soldering is not difficult.
1. you need desoldering tool (**** type)
2. soldering iron of 40W
3. and silicon grease for greater transfer between IC body and heatsink.
i bought that personally in asia for less than 50USD on two IC with same part # .
let me know if there is any other thing i can do.