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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  • bashlort Oct 28, 2007

    Hi Mike,

    I can't adjust both the brightness and contrast to 0 because before I can access the menu settings in my set it will shut down. But I have managed to put the TV set in service default mode and its error blinks corresponds to high beam current and black loop instability.

    I adjust the screen voltage and see the retrace line and back down the screen voltage, but still no joy, my tv is still shutting down. Thanks for your advise. BTW, my TV set is just 1.5 yrs old. I'm just dissappointed that after it broke down 6months after its warranty.



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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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