trying to identify this transistor
its from a denon amp where one channel burnt up a couple resistors and transistors.
its from a denon amp where one channel burnt up a couple resistors and transistors.
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Re: SMD transistor ?
Uh what marking codes do you read? You're a little closer to the part than a jpg.
What model number?
You can try wet the top or find the same transistor somewhere else to better read it. -
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Re: denon amp SMD transistor ?
model #avr-s730hComment
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Re: SMD transistor ?
[QUOTE=redwire;1262196]Uh what marking codes do you read? You're a little closer to the part than a jpg.
to me looks like the markings on it are YV and AF sidewaysComment
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Re: denon avr-s730h amp SMD transistor ?
Q5707Attached FilesComment
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Re: denon avr-s730h amp SMD transistor ?
thank you that's exactly what i neededComment
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Re: denon avr-s730h amp SMD transistor ?
Q5707 not likely to fail, it has resistors all around it and even then it's just the over-temp detection with the thermistor. SOT-23 SMD marking code YM MMBTA92.
Not sure why Denon left out the over-current protection diodes like D5702-D5705.
The bias transistor I could not find data on a BN57B. It would get blown if an output transistor fails, and it's on the heatsink. Something to check.Comment
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Re: denon avr-s730h amp SMD transistor ?
BN57B seems to be a plug location, BN51B ~ BN57B for Bias Transistor q2104 ktc3964 mounted on a small boardLast edited by R_J; 08-15-2023, 09:55 PM.Comment
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Re: denon avr-s730h amp SMD transistor ?
what failed was q5105 and q5106 where shorted along with q2104 on the small board on the heatsink plugs in at bn51b. also resistors r5117,r5118,r5119and r5121 were all burnt.
was only checking q5107 because i get a different reading on that part then every other channel (the pic i used was q5707 same part different channel )Comment
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Anyone run memory speed tests with an old X58-based triple channel 1st gen or any other >2 channel board? The one I have is a Gigabyte I think.
Anyway I had four 4GB DDR3-1333 modules in the 6 memory slots and got around 11GB/sec memory speeds assuming that it went dual channel since it didn't have enough modules for triple channel. Now I stuck in two more 4GB modules, but they are DDR3-1600. I'm still getting 11GB/sec speeds according to memtest86...
Just wondering, anyone do memory speed analysis on these triple (and higher) channel memory boards? Are there any... -
Hi friends
I have reverse engineered this tester, schematic is attached and is complete except for capacitor values. These testers annoyingly have no model number but they are the ones you find on the first page of just about any website if you type in "18650 4-channel tester". There is also a 2-channel variant and a newer 8-channel variant. They are very cheap (about £15) and can measure voltage, current, internal resistance and capacity. They have a multicolour display for all these statistics. They also have terminal blocks so that if you want to use a breakout board... -
Hello,
I know some might say... just buy another one. Sell it as parts..!
So had this AMP for quite some time. Recently I saw light smoke coming out of the AMP. Had my fire extinguisher close by. Just kidding. Turned immediately all devices off from mains.
Let things cool a bit, and opened up the amp device. I clearly saw on the main board which hosts the 5X amp (5.1), 3 10 ohms 1W resistors had their leads looking black, while the rest of the remaining 2 x 10 ohms were brownish as being installed from factory.
Spent some time downloading the Service...06-11-2024, 08:38 AM -
Hi all forum members,
Fyi, i have been working on this old model PCT-4082 (4 channel car amplifier). The owner said only one channel is working.
My initial finding is this amp originally use Toshiba 2SA1943 and 2SC5200 transistor for its output but after opening the top casing i found it used Toshiba A1941 (pnp)and C5198(npn). I desoldered all the 4 pairs transistors and found 1 piece A1941 open(tested "OL" on all legs) and replaced the 1st pair with 2SA1943 and 2SC5200, thats why you can see in the picture it is the bigger size transistor. The other A1941 and C5198 all... -
Hello,
I'm repairing a Denon AVR-X2000 that has blown both FR channel output stage transistors. Upon replacing the transistors (Q416 and Q422) witch a matched pair and replacing both burnt 22Ohm base resistors (R458 and R483) the unit powers up and I was able to set idle current to spec (8mV on test points) across all channels except for the FR channel that had a problem, it tests 0V and I'm unable to adjust that at all. The transistor (Q421) which regulates the bias current tested okay (it sits between the big transistor pair). Also I'm unable to produce any audio from any channel....
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