Question about Philips 20PT6441 20" TV

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21PT3324/71 Philips TV wont stay on

TV set needs to be warmed up before it will on continuously. Then it has now the problem that it will on for about 8seconds then will off automatically. you need to turn it on using the remote control. I did some resoldering thinking that it is just a cold solder but nothing happens. here is the voltage measurement: Filter cap = 298 Vdc Collector of Horizontal out Trans = 35Vdc What are the readings supposed to be? What approach can I do to troubleshoot my TV? Thanks in advance.

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Re: 21PT3324/71 Philips TV wont stay on

Try this: On the flyback transformer, raise the SCREEN voltage. There are 2 controld on the flyback - the top one is FOCUS and the bottom one is SCREEN. As the tube ages its emission decreases, and the computer monitors the tube's emission. When the emission gets to be too low, the computer shuts the set down. This is exactly like IK blanking in Sony sets, except Sony blanks the video and Philips shuts the set off. To set the screen voltage properly, turn the brightness and contrast to 0, raise the screen voltage until you see the white retrace lines in the picture, and then back down on the screen voltage until just past the point where the retrace lines are gone. Reset your brightness and contrast and the set should play fine.

Posted on Aug 14, 2007

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