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Toshiba DVD SD-3109U weak audio

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billccm

Jan 1, 1970
0
Hello All:

I have a Toshiba DVD player, model SD-3109U. Both L and R channels have
really weak audio with some slight distortion.

I pulled the circuit board near the rear of the unit where the RCA
phono connectors are mounted. Solder looks good, and there is not much
on this PCB active components wise.

Any idea where to look? I assume since both L and R channels are both
weak, it is in a common device somewhere.

I would really like to fix this DVD player; it is my favorite in the
house.

Thanks for any help, and Merry Christmas to all!

Bill
 
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Jerry G.

Jan 1, 1970
0
The only way you are going to be able to troubleshoot this is to buy
the service manual, get a good scope and DVM, and the calibration CD,
and start troublshooting the player. If you are not experienced in
troubleshooting CD players and have a solid background in the theory at
the component level, it will be a struggle to go through it.

It would be more feasible for you to give the player over to the
authorized service rep for Toshiba. You may find it expensive to
service in relation to replaceing it.


Jerry G.
======
 
A

Arfa Daily

Jan 1, 1970
0
billccm said:
Hello All:

I have a Toshiba DVD player, model SD-3109U. Both L and R channels have
really weak audio with some slight distortion.

I pulled the circuit board near the rear of the unit where the RCA
phono connectors are mounted. Solder looks good, and there is not much
on this PCB active components wise.

Any idea where to look? I assume since both L and R channels are both
weak, it is in a common device somewhere.

I would really like to fix this DVD player; it is my favorite in the
house.

Thanks for any help, and Merry Christmas to all!

Bill
Is the display OK ? One of the Tosh models from a couple of years ago, but I
can't remember exactly which one, used to suffer from the decoupling caps on
the + / - 12v rails that feed the audio out buffer amp, going short circuit.
I seem to recall that if the one on the "+" rail went, you got no or v.low
audio and no display, and if the one on the "-" rail, just no audio. I
think on that model, there are two or three little 8 pin opamps that buffer
the audios on the ouput board, and the caps in question are a couple of
100uF electrolytics.

But before you start getting too technical with it, just check in the menus,
that no one has accidentally changed the audio mixdown on it.

Arfa
 
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billccm

Jan 1, 1970
0
Thanks for the replies. I took all three PCBs out and inspected the
solder under the mircosope; looks good. There are a few MSOP and SOIC 8
pin devicews on the output PCB, and LOTS OF Electrolytics!
I am going to call a local repair shop to see if they fix these things.
Since the unit is entirely surface mount, with some really high pin
count TQFP devices, I wonder how a repair shop can even change out
components in these things now days.
Have a safe, and happy Holiday ALL,
Bill
 
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David Naylor

Jan 1, 1970
0
billccm said:
Hello All:

I have a Toshiba DVD player, model SD-3109U. Both L and R channels have
really weak audio with some slight distortion.

I pulled the circuit board near the rear of the unit where the RCA
phono connectors are mounted. Solder looks good, and there is not much
on this PCB active components wise.

Any idea where to look? I assume since both L and R channels are both
weak, it is in a common device somewhere.

I would really like to fix this DVD player; it is my favorite in the
house.

Thanks for any help, and Merry Christmas to all!

Bill
Hi there
I work for a service center, but it has been a long time since i
have worked on a DVD player. but as i remember, the toshiba with weak
audio was a common problem it was cause by a shorted Electroletic cap
in the power supply check them all i think it was c 528 and 529
But nat really sure.. as i said check them all.. and the thing was you
could just cut the thing out and the unit would work fine. i was a
service buliton and that was the fix good luck
 
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Franc Zabkar

Jan 1, 1970
0
Hello All:

I have a Toshiba DVD player, model SD-3109U. Both L and R channels have
really weak audio with some slight distortion.

I pulled the circuit board near the rear of the unit where the RCA
phono connectors are mounted. Solder looks good, and there is not much
on this PCB active components wise.

Any idea where to look? I assume since both L and R channels are both
weak, it is in a common device somewhere.

I would really like to fix this DVD player; it is my favorite in the
house.

Thanks for any help, and Merry Christmas to all!

Bill

FWIW, here is a service manual with circuits:
http://www7.toshiba.com/secured/tass/technical/dvd/SD5109.pdf

- Franc Zabkar
 
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Ken G.

Jan 1, 1970
0
I dont remember models either but the Toshiba problem ones had a small
sized case .
There were 4 small capacitors over near the input/output jacks that were
to small of voltage rating . It is confusing because there are quite a
few caps in the spot .

The caps would turn into resistors and mute the sound . I fixed about 8
of these till i stopped seeing them come in . In some of them i was able
to get it to jump back on by being fairly aggressive pushing , bending
and pulling on capacitors then replace it .
I used to have the board part #`s but lost it .
 
B

billccm

Jan 1, 1970
0
Thanks for the schematic! I will trace the audio tonight!

I'll let you know what I find. Thanks again, and Merry Christmas to
all, Bill
 
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