Read in someone elses similar problem that this may be related to a bad Cap on the B+ line to the Vertical IC... does this sound correct? Here's a picture of the problem. The top of the screen is getting worse by the day. It started out just barely noticeable a week or two ago. And keeps growing wider. The top of the screen has rolled itself down onto the picture and inverted itself. Any suggestion would be helpfull. I have done some minor tv repair in the past, and I'm also a laptop computer specialist. I have skills in soldering and such, just need to know what to replace, I have no schematic on hand for this.
Philips 27PT6441 http://www.nbrepairs.com/tv_1.jpg
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You have some bad grounds on the Vertical IC. In addition to this, in the immediate area of this Vertical IC, are a few bad capacitors. Look for this IC mounted on a large heatsink. It may have seven pins . I cannot remember for sure. I have not worked on this particular TV, so I cannot give you specific locations. But I assure the problem is in this area! If you have some electrical experience you can pull this board out. In this case only the caps need replaced and the IC resoldered. Good Luck and thank you for asking. If you have anymore questions, visit me...Thanks Again! Your south of the border tech!
Hello jpm1lo, your problem needs someone with some repair skills to assist you, firstly your TV has both a horizontal and a vertical circuit,your problem is in the vertical circuit. The IC (integrated circuit) in the vertical area should be changed together with the 2 or 3 cylindrical capacitors ( number will vary in different brand names) also in the same circuit. This will rectify your problem.....Rudney
This is either bad connections at the vertical IC or a defective IC. This should be a small flat IC attached to a heat sink. It will be marked LA7837 or something similar. It will have about 11 pins. If you are not sure you have the correct one, post the marking here and I'll confirm.
The vertical output IC has stopped working. The vertical output IC is the part that drives the coils in the yoke that spreads the picture up and down. This could be because it has cracked loose from the board (solder joints) or it simply burned out. Sometimes a bad pump-up cap will cause the vertical output IC to short out, and when the IC shorts out it often opens up a small value resistor next to the flyback. This is a relatively easy thing to repair. A qualified tech will be able to tell exactly why the vertical output has stopped working and repair it for you.
When you see white lines at the top of the screen, it means that the pump-up capacitor next to the vertical output IC is bad and the IC is about to quit. When the output finally quits, you get a black screen with possible dim spots. The vertical output IC and its pump-up cap will have to be replaced, and the little fuse resistors next to the flyback in the + and - supplies to the vertical output IC must be checked too. If you have experience working on TV's then you can do it yourself, but if not then have the set serviced by a tech experienced in Sony sets.
There is a capacitor going bad and is not charging all the wayor it takes a while to charge,is an electrolitic cap so it has polarity and the replacement needs to be conected the same way,the circuit board has the marking were the negative and the positive are and the cap is marked too,he should be a 1.5 microfarad at about 160 volts and sometimes is close to the vertical Ic,if you are familiar with tv service this information should help but if you are not too familiar seek the help of a servicer,it should not be too expensive,the vertical IC might need to be resoldered.Let Us know if you need more help.