Question about Sony STR-DA90ESG
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 ?
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
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Posted on Jan 02, 2017
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