Toshiba DVD SD-3109U weak audio

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. ======

billccm wrote:

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

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

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

On 21 Dec 2006 19:45:39 -0800, "billccm" put finger to keyboard and composed:

FWIW, here is a service manual with circuits:

- Franc Zabkar

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 .

Thanks for the schematic! I will trace the audio tonight!

I'll let you know what I f> On 21 Dec 2006 19:45:39 -0800, "billccm" put finger

circuits:

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