Home |
Search |
Today's Posts |
|
Electronics Repair (sci.electronics.repair) Discussion of repairing electronic equipment. Topics include requests for assistance, where to obtain servicing information and parts, techniques for diagnosis and repair, and annecdotes about success, failures and problems. |
Reply |
|
LinkBack | Thread Tools | Display Modes |
#1
|
|||
|
|||
Need to ID a MOSFET from a Bose amp
I'm trying to repair a Bose amplifier from a '92 Audi. One MOSFET
is cracked and I want to replace it but Google has not been my friend on identifying this. They are a TO-220 package size. Three of them are marked ST 99103 137110 one is ST 99112 137110. No numbers on the ST website are close to this. I'd like to get something from Digi-Key since parts stores are rare here (except for Radio Shack if they have something that would work). I also assume I have to replace all four if I can't get an exact replacement. Any help is greatly appreciated. Thanks Tom Amundsen. E-mail: |
#2
|
|||
|
|||
Tom Amundsen schrieb:
I'm trying to repair a Bose amplifier from a '92 Audi. One MOSFET is cracked and I want to replace it but Google has not been my friend on identifying this. They are a TO-220 package size. Three of them are marked ST 99103 137110 one is ST 99112 137110. Should be TO-220FP (insulated case). Those are STP20NE06FP with custom marking. Digikey has at least the IRFIZ24N as fine replacement. Regards, Dieter |
#3
|
|||
|
|||
"Tom Amundsen" wrote in message ... I'm trying to repair a Bose amplifier from a '92 Audi. One MOSFET is cracked and I want to replace it but Google has not been my friend on identifying this. They are a TO-220 package size. Three of them are marked ST 99103 137110 one is ST 99112 137110. No numbers on the ST website are close to this. I'd like to get something from Digi-Key since parts stores are rare here (except for Radio Shack if they have something that would work). I also assume I have to replace all four if I can't get an exact replacement. Any help is greatly appreciated. Thanks Seems like the 99 whatever is the date code. The 137110 is probably the part number, which is an in-house number? The manufacturer is obviously ST, SGS Thomson. As for replacing all four, it depends on how the FETs are used in the amp. If they are used in pairs, one pair for each channel, then you should be able to replace just a pair. But then nowadays I've seen car amps with four output devices, in an H bridge configuration in each channel, to get more power from the 12V. So you have to check to see how they're used. And it's possible that some devices might be used to convert the 12VDC up to a higher supply voltage, so the bad FET might be in that circuit. If you can see audio across them, then that would eliminate that possibility. That's the nice thing about stereo amps: if one channel is still working, you can use it to compare the voltages in the bad channel. Tom Amundsen. E-mail: |
Reply |
Thread Tools | Search this Thread |
Display Modes | |
|
|
Similar Threads | ||||
Thread | Forum | |||
Tips on removing MOSFET | Electronics Repair | |||
BOSE Lifestyle 12 Repair - Receiver CD Player | Electronics Repair | |||
Heatsink compound for a 2SK2690-01 MOSFET/ TO-3P pkg. | Electronics Repair | |||
Datasheet for Mitsubishi MOSFET FS10KM | Electronics Repair | |||
High Side and Low Side Mosfet | Electronics |