Question about Sony STR-DA90ESG

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Sony STR-DA90ESG in Protect

Trying this once again now that I have been able to establish a user account - sorry for repeat post but I REALLY want to get my DA90ESG working !! Any help is most appreciated -

I have the same model, same problem. I understand that one or more of the output transistors are shorted. I took it to a repair shop in Orlando. My problem is the repair tech said there are 16 (I think) output transistors and they are around $25 each his cost - he showed me in his parts book.

He said no way to tell if one was bad, a few, or all, without expending the labor to lift their legs off the circuit board, and he was not going to order 16 replacements which would cost him $400.

So I am stuck. I used to repair commercial power amplifiers so I could do the work myself but the way consumer units are built 0 including this one - its a real pain to get in there and isolate each output drive transistor to see how many are blown.

I love this unit, despite its use of non-standard IR carrier frequencies, which is why no programmable or universal remotes can learn its codes. But s allows separate routing of audio and video, which is a rare feature in consumer units.

Any advice is appreciated. It seems to be the COST of the replacement transistors and the labor to find out how many are even bad that is why this repair shop just handed me the unit back. Maybe another repair shop in the Orlando area ?

Thanks !

Posted by on

  • bbittel May 14, 2008

    I will open the unit and get the part numbers off
    of the transistors. Are these just standard 2-junction transistors or are they
    monolithic hybrids, push-pull pairs or something like that ? If just regular
    2-junction transistors, I should be able to lift their legs and measure the
    junctions with a meter set on diode test - You usually see a dead short across
    the emitter/collector junction IIRC.

    Also, I can look for the voltages you specify but
    if the pins are lifted, do I measure at the pin itself or on the circuit board
    where the pin is normally soldered to ? I would guess I am going to see rail at
    the collector, 0v or close on the emitter and 0.6 or so on the base, w/ respect
    to ground. Is this correct ? THANKS !!!



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Doesn't sound right to me. I work on these all day long. First of all the transistors from Sonty are probably $25 each. What were the parts? I usually use the Japanese equivalents. I'm guessing that the transistors are Mp and MN numbers. These equate to 2SB and 2SD numbers. These devices are the same. Sony re-brands the numbers. Also, if one of the transistors is shorted for one channel, change both for that channel even if the other measures good. I'll research your model and try to narrow this down a bit. In the meantime, lift the pins on ALL of the transistors and measure the voltages on all 3 pins. You should read (+/- 0.6 or 1.1V, 0.0, and B+/B-). Post those readings here.

More to follow...

Posted on May 14, 2008

  • ABRsvcs May 14, 2008

    Measure at the board. What we are looking for here is whether or not the output transistors are the problem. With them removed, I believe that the voltages should be correct at the 3 pads. If not, then we need to look at the driver stage. With the unit off, you should be able to check the outputs in-place with a diode checker. You should not read a short. If you do, that tis the bad channel. Lift all 6 legs for that channel (2 transistors) and try turning on the unit. If that was the bad channel, you should see the unit start up.




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