Question about Philips 20PT6441 20" TV

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The power is normal but the vertical IC is very hot. and after 3minutes the screen is going to vertical line

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IC needs to be replaced

Posted on Oct 01, 2009

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My compaq monitor just start blinking and now only haft past of the screen is visible. the rest just went black with on bright shining line on the middle of the screen


hi,
Your monitor have problem with vertical deflection section. Can caused by the faulty vertical driver IC and faulty electrolytic capacitor it the vertical section or dry soldering in the pins of the vertical driver IC. When vertical section fails horizontal lines come on the screen. For testing the same you have to open the monitor and remove the main board. you can easily find out the vertical ic. just follow the four wire running from the deflection yoke ( coil on the crt neck) of which two will go to the horizontal section (normally red and blue wire) and two will go to the vertical section ( Normally yellow and green wire). Follow the yellow and green wire which will be connected to one of the socket in the main board. Follow the circuit track in the main board which will lead you to the vertical deflection section. There you can see one ic is fitted on a aluminium heat sink.Take a close watch in soldering of its leads. Dry soldiering can happen in its leads because its a component which will got to a temperature about 75 degree above at its normal working condition. if found any dry-soldering or not just resolder all the pins of that ic. then check the monitor. If problem remains then you have to relapse the ic.While replacing the ic try to relapse all the capacitors in that section. It will prevent from any further damage to the new vertical ic. if you need any more assistance feel free to contact me through fixya

Jun 09, 2011 | Compaq P 1220 22" CRT Monitor

3 Answers

Tv has horizontal lines on top of screen.


Hello
You are seeing vertical retrace lines on the top of your TV screen.
There are mainly three causes for it. I don't know the age of your TV. The first cause is due to the supply voltage lack to the video output state. You can check it on the picture tube base card. You haven't mentioned about the diamension of your TV screen. So it can be say as a guess. If your TV is 27", the voltage mantioned above will come to about 245VDC. If there is a great voltage loss, check the smoothing capacitor to that supply, will normally come to the value of 10MFD 450V.
The second one is, capacitor related to the vertical output stage of your tv. It is in the circuit board. Normally these capacitors are situated in an area, which will get hot during working. As s result, there is a chance to the value change of their capacitance. It is best to replace all of them, as it may not cost too much. Before desoldering it out, mark the value of each capacitor is best. Normally replacing the filter capacitor 3300MFD or so,to the power supply to the vertical output Ic will solve this problem.
The third is related with the vertical output Ic itself. Just check all the soldering points in the vertical output section of your tv board. Anyway, resoder all suspected soderings by applying a little more solder, as bad solderings to the legs of the Ic or some other components also may the cause. OK.

Nov 10, 2010 | Toshiba Televison & Video

2 Answers

My screen close down from top to bottom and lives a horizontal line rite @ the center of the screen,,,,, Which component is mostly faulty in here ? and what kind a component is this ..?


Hello
It may be due to an Integrated Circuit [IC] fault. Your TV has lost its vertical sweep, and the is why you see a norizontal bright line across the center of the screen. All TVs has bot Hotizontal and Vertical Sweep to spread picture on the screen. When Vertical sweep fails, you will see a horizontal line, and when horizontal sweep fails you will see a vertical line at the middle of the screen.
n your TV, most likley the vertical Ic is faulty. This is a common phenomena in almopst all telivisions. The said IC is diretly soldered into the circuit board inside your TV. To replace it you have to open your TV. Take all precautions before opening the back cover of your TV. You are going to work with an electrical equipment, and keep it in mind always. After opening the back cover, just locate where the Vertical Output Ic is. It will be normally screwed to a heatsink plate, inorder to radiate heat from it while working. You can locate it by the following method. Different TV circuits has different positions to this Ic. Just look on the Deflection Yoke [the coil fitted on the neck of picture tube]. From there four wires will go to the main printed circuit board. Out of which two of them will be thick, and other two will be thin. The two thin wires are the carriers of vertical sweep from main board to deflection yoke. Follow the the two thin wires. You will see it to be pluged into one point at the printed circuit board. Just upside down the printed circuit board, after pulling it outwards, not disturbing any of the wirings, and look through the circuit track, to which point the tracks goes to. Somewhere near to it you can locate the above said IC.
Just take the main input votage to that IC. It will be normally 18v to 35VDC. You must have multimeter to measure this voltage. If the voltage is there, look for any loose solderings over there to the legs of that IC. If there is any soldering loose, the IC will not work properly, and vertical sweep loss will be the result. If there is proper voltage check the voltage at the output pin of that Ic. It should be almost half the voltage of the supply voltage. If it is not there, make sure that the IC has damaged.
Resolder it out from the board, and go for a same type and number. Replacing it will solve the problem. Normally vertical output ICs are not very cosltly. Here in India, all types of vertical Ics will have a price rate between 80 to150 Indian rupees, that is upto four American Dollars. Ok.

Nov 06, 2010 | Sony KV-35S65 35" TV

1 Answer

I turned it on and just one line accross the screen appears. the audio is fine.Everything is normal except theres just a line on the screen.


You have a vertical problem. You may need to resolder the vertical IC, and check each cpacitor that is near the vertical IC. Your TV will be restored to full screen!

Mar 27, 2010 | Televison & Video

1 Answer

Horizontal line on screen


normally this is a problem with the vertical ic, take a close look at the soldering if your lucky you find hair cracks and re soldering will solve the problem.if that does not help , check the connections of the deflection unit or the condensers around the vertical ic.take care chassis is still dangerous if unplugged.
good luck

canut

Nov 27, 2009 | JVC AV21TG TV

1 Answer

Red vertical line down right side of the screen


hi

I think your TV have a trouble inside lcd panel
the controller board contains driver IC. Deffective driver IC can cause of line display.
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Three reasons why one vertical line accross screen can happen in LCD;

1.The missing signal from the controller IC to
LCD driver.
2. LCD driver IC itself defective
3. Dry contact in the tape carrier package.

Use masking or electrical tape to mark it where the line was located. press it if the line back to normal but when release your hand came back i think it was intermittent. Open the LCD panel

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Use robber
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Place the rubber on the top of TCP
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Gently close back the top casing

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Good luck...





Aug 21, 2009 | Mitsubishi LT-46144 46 in. LCD HDTV

1 Answer

Rainbow line will come across screen and then goes blank. This is an intermittent problem. Normally if I turn it off and back on, it works. Now it does not.


try resoldering the vertical output IC, the IC runs at a hot temperature and this can cause the Pins to have cracked solder.

May 23, 2009 | Mitsubishi WT-46807 46" Rear Projection...

2 Answers

Philips 21PT2325/71


roy replace the vertical ic with original or second hand ic because mostly of the brand new parts in store is defective.

Jul 16, 2008 | Philips 20PT6441 20" TV

3 Answers

Screen only showing single line of video in center.


hi there, is the single line horizontally or vertically? if horizontal line, you do have a vertical section problem, check some parts at vertical section, the vertical ic, the power source of vertical section ie diode & resistors. ty

Dec 26, 2007 | Zenith Z32X31D 32" TV

1 Answer

Toshiba TV


vertical deflection problem. Vertical output IC, pump up cap, power to output problem, bad connections, jungle IC. Its a good idea to replace all electrolytic caps near the output IC. Bad caps cause it to run hot and self destruct.

Oct 29, 2007 | Toshiba CX36F84 TV

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