Question about Philips 27PT6441 27" TV

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27pt6441/37 Thank You, The number next to the blown up chip is 7531 and its an 8 leg chip. Thanks again.

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This is a vertical chip. Call any electronics parts distributor and order part # TDA 7531. Theyn will know what you're talking about.

Posted on Mar 04, 2008

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I realized this after i did the same thing as you did and saw that i didn't have 3 blinks until aftr i solder those same chips. Coming here and seeing you have the same problem as i did, i went back and changed what i did.

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I decided to go back and clean up the job i did and after doing a better job, i turned the tv back on and it came on with no problem. I hope this helps and i don't check here too often but you can email me at cea_4@yahoo.com if youhave any question.
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1 Answer

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thank u rate me!!

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1 Answer

No sound



NO Sound
First check to make sure there isn't a mute switch or switched to external speakers, then
use ohmmeter to measure the speaker resistance (3ohm to 30ohm is usual).

Now find the speaker wires, and follow them down to the pcb, and look for a chip with
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(if there is no chip then it will actually be a transistor push/pull pair).
snd.gif

If no voltage of at least 6v then look at the pcb from each leg of the chip, and look for an electrolytic cap to earth, thats the power line,
so follow it and look for a voltage regulator or straight from power stage (PSU),
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check for fusible resistors and power diode and smoothing cap.

If voltages are ok, then when your meter (other probe hanging loose) probe touches the input pin ,a buzz from speaker should sound, if not then change chip.

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Questions
Is the eeprom/micro pro set to a different country sound system ?
Is the mute line on ? micro pro control
Is the speaker switch set to internal ?
Is there power to the output chip ?
is there at least one pin (on the o/p chip)with about half the power voltage ?
Is there power to the sif chip (12v) ?
Is the tv from another country (different xtals) ?

Hope this may help you;

Regards,
VOTIT

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The only way now would be to get the service manual I'm afraid. Good Luck

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