STK4141 is not always STK4141

matti6 · 11th March 2007, 10:20 PM

i am from Germany, thougt this could be interesting for you.
While repairing an JVC I found this. On left side are MOSFETS,
IRF620 and IRF6215. This IC is bad, it makes no good Sound.
Look at the writings- on the other one The Letters are rounded,
I think this is because it came from Japan. You can buy such an "IC" at reichelt.de (8 Euro) You see also the burned wirings, I will try to replace the Transistor. Sorry for bad english/error if any and greetings. matti

Netlist · 11th March 2007, 10:43 PM

Thanks for posting this.
Did you see this thread?
My Transistors, original or copy?
Please add more of these nice examples if you find them.

/Hugo

matti6 · 14th March 2007, 02:12 AM

prepared for new transistors, resistor 170 ohm replaced.
The bad IC had a Middle Point Voltage (where Sony has +/-70mv)
from 0,2 Volt and 0,3 Volt. I could hear that by connecting the Speakers. If this will work again ?

matti6 · 14th March 2007, 03:00 AM

uuh.. not sony but sanyo built this, sorry

matti6 · 15th March 2007, 02:43 AM

only for fun but interesting, mp3 player ?

my new high end amp
-)

matti6 · 17th March 2007, 12:55 AM

prepared, not tested yet

Netlist · 17th March 2007, 07:38 AM

I remember those days of mp1.

/Hugo

11th March 2007, 10:20 PM	#1
matti6 diyAudio Member Join Date: Mar 2007	STK4141 is not always STK4141 i am from Germany, thougt this could be interesting for you. While repairing an JVC I found this. On left side are MOSFETS, IRF620 and IRF6215. This IC is bad, it makes no good Sound. Look at the writings- on the other one The Letters are rounded, I think this is because it came from Japan. You can buy such an "IC" at reichelt.de (8 Euro) You see also the burned wirings, I will try to replace the Transistor. Sorry for bad english/error if any and greetings. matti

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11th March 2007, 10:43 PM	#2
Netlist diyAudio Moderator Join Date: Jan 2003	Thanks for posting this. Did you see this thread? My Transistors, original or copy? Please add more of these nice examples if you find them. /Hugo

14th March 2007, 02:12 AM	#3
matti6 diyAudio Member Join Date: Mar 2007	prepared for new transistors, resistor 170 ohm replaced. The bad IC had a Middle Point Voltage (where Sony has +/-70mv) from 0,2 Volt and 0,3 Volt. I could hear that by connecting the Speakers. If this will work again ?

14th March 2007, 03:00 AM	#4
matti6 diyAudio Member Join Date: Mar 2007	uuh.. not sony but sanyo built this, sorry

15th March 2007, 02:43 AM	#5
matti6 diyAudio Member Join Date: Mar 2007	only for fun but interesting, mp3 player ? my new high end amp -)

17th March 2007, 12:55 AM	#6
matti6 diyAudio Member Join Date: Mar 2007	prepared, not tested yet

17th March 2007, 07:38 AM	#7
Netlist diyAudio Moderator Join Date: Jan 2003	I remember those days of mp1. /Hugo

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