hahahaah lol
ok well
ill try too help you
first thing too do is see how the codecs health is using a tool for modems {from the chipsset makers site} and generic drivers from creative or use windows defaults}
or you can fire strings at it too test each part
if there is no dial tone then the signal that switches the relay {if it is descrete the fet or transistor} that comes after the diode is missing or the device is gubbed some modems use two fets and one pnp transistor to switch the line on and off
remember you remove the short too activate the line
to test it in circuit do this
take the card out
place a multimeter on diode test
place the + to the base or gate f the transistor to test with collector and emiter for a short
you should have one or a very low 33R resistance depending on the setup of the socket
also
there will also be a couplng coil too couple accross the modulation from the chip
but as you know you wont get anywhere without first the card being able to pick the reciever up
for this you need two signals the line signal {always there} and the picked up ring tone}
now we know that is says no dial tone
?but does it pick the line up
if it does {you can dial the line then dial on the cpu if the ringer on the phoen stops then the switching works
and its the demodulator limiter
thats the problem the first audio stage maybe the coil has fried so replace it
for switching problem
so once you establish this is switching on and off check for a short too gnd on the collector of the switchers and also for a voltage{ to run the transistor} is being developed by the regulator on the card for a pci card it has a 5 v regulator
sometimes these have a zero R links {look like chip resisotors}
these go open circuit disabling the whole ringer detection and switching supply
the rest is
1} if you get switching {you can add a wire to a point then plug it in and test the end}
its primarily another componet check for short caps and shorted arrester {like a little metal can with two end cups}this should be an open circuit too> 2kv then it will flash
it has a ceramic cup sometime a flash kills it and it melts going short
{if you plug in a phone and listen too the line try ringing the phone and seeing if it answers once set too answer mode}
also check the very thin gold contacts at the socket
sometimes they get melted {you could chase that one for a while}
so...... other than that it mentioned in a topic above
take a good quality scan or picture of each side {with any plastic housings they have removed}
and pm these too me see if i can spot the fault {there is so many types familys of familys of modem}