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Low or no sound

The power chip for sound test ok where to look? no info about any microchip any way of getting diagram? tv philips 20pt5441/37

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If the power chip is okay check the drivers. Make sure it's getting an input. Audio is picked off of the IF section. Make sure you have audio there and trace it out to the power output.

Posted on Feb 18, 2009

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We have no picture, just rainbow pinkish effect, no sound either.


I have a Philips Matchine television which does a similar thing, the problem is in the receiver part of the set, where I have traced the Video signal with an Oscilloscope to a particular Chip (Integrated Circuit). By increasing the Contrast to maximum the picture can be brought back again, but still lacks contrast. The fault is varies as the chip warms up. Therefore you can locate the chip by cooling or heating it from a special non inflammable spray can.Have you tried the scart input which may work OK, then you can use the television as a monitor, as I do. Cost of repair is not worth it.

Nov 11, 2008 | Philips Magnavox 27MS343S 27" TV

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
7/8 legs then measure the voltage on all of its legs, you should get 8v to 20v on one pin and half of that on one of the others, the internal circuit of most chips is that of a push/pull output stage, with the output coming from the middle of the pair of transistors.
(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),
and test if voltage there.

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.

if buzz occurs then your looking for the SIF chip,
so look for a three legged Xtal filter with 6mhz (5.5mhz europe) thats the chip.

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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Hi,

You can check any 5v input to the microprocessor and sound is the audio IC whether have any voltage input.You can try to troubleshoot but please be careful.I don't have your model schematics but oher philip models.


Regards
alan

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Need schematic Diagram


HI I HAVE 21PT2325/71 model...no sound and no video...raster ok..in A/V mode
audio is good but no video.hope you can help me....Jambet..

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Re:philips


It might test ok resistance wise but might break down under the load of the television in operation. Then again it depends on how badly it was burned.

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