testing transistor

moss99 · 22nd June 2010, 07:04 PM

Hi all i am new to amp diy etc so trying to fix a few amps i use an atlas semiconductor to test transistors etc but my latest project has
philips TDA1514A where i would expect to see the output transistors they have 9 pins not the 3 i am used to testing
can anyone point me in the right direction to how i go about testing these
thanks

mark..

PROFESSOUR2003 · 22nd June 2010, 10:16 PM

hi
can you upload a photo of that transistor who have 9 pins or either what`s written on it..

moss99 · 22nd June 2010, 10:20 PM

Hi yes it has on it :
TDA1514A
N9C0K1
HSH9930 7

thanks..
mark

PROFESSOUR2003 · 22nd June 2010, 10:27 PM

first check if there is short circuit between any two pins using DDM then measure the voltage on pins 6&4 wrt ground

moss99 · 22nd June 2010, 10:29 PM

I have them out of circuit so should i put them back in to test them ?

PROFESSOUR2003 · 22nd June 2010, 10:34 PM

check for short circuit between pins out of the circuit if there isn`t . put them back and check for voltages on pins 6&4 and also does it became warm while working .??

sregor · 22nd June 2010, 11:47 PM

TDA1514A is an IC, not a transistor. If its blowing a fuse, than it is probably gone bad. If it's not working, get the data sheet and check voltages. There is no transistor test. Except for shorts between pins, there is no simple way to test out of circuit. Good Luck

moss99 · 06:35 AM

Hi ok
i was testing for voltages on pins black probe of dmm on chassis was not really getting very good readings when a bit of a pop smoke and 2 blown fuses dont know if i shorted 2 pins or not (i was being very careful i thought)
But looking at amp it seems much more simple than others i have succesfully repaired it seems the mains power go,s to transformer but i cant see what changes the voltage to dc no bridge rectifiers
i will try and post a photo ..A1.JPG - download now for free. File sharing. Software file sharing. Free file hosting. File upload. FileFactory.com

Netlist · 23rd June 2010, 06:58 AM

Please upload your pictures to this site.
FileFactory does not work very well.

/Hugo

moss99 · 23rd June 2010, 05:55 PM

A1 (1632 x 920).jpg

22nd June 2010, 07:04 PM	#1
moss99 diyAudio Member Join Date: Feb 2009	testing transistor Hi all i am new to amp diy etc so trying to fix a few amps i use an atlas semiconductor to test transistors etc but my latest project has philips TDA1514A where i would expect to see the output transistors they have 9 pins not the 3 i am used to testing can anyone point me in the right direction to how i go about testing these thanks mark..

22nd June 2010, 11:47 PM	#7
sregor diyAudio Member Join Date: Jan 2006 Location: massachusetts	TDA1514A is an IC, not a transistor. If its blowing a fuse, than it is probably gone bad. If it's not working, get the data sheet and check voltages. There is no transistor test. Except for shorts between pins, there is no simple way to test out of circuit. Good Luck __________________ Steve

23rd June 2010, 06:32 AM	#8
moss99 diyAudio Member Join Date: Feb 2009	Hi ok i was testing for voltages on pins black probe of dmm on chassis was not really getting very good readings when a bit of a pop smoke and 2 blown fuses dont know if i shorted 2 pins or not (i was being very careful i thought) But looking at amp it seems much more simple than others i have succesfully repaired it seems the mains power go,s to transformer but i cant see what changes the voltage to dc no bridge rectifiers i will try and post a photo ..A1.JPG - download now for free. File sharing. Software file sharing. Free file hosting. File upload. FileFactory.com Last edited by moss99; 23rd June 2010 at 06:35 AM.

23rd June 2010, 05:55 PM	#10
moss99 diyAudio Member Join Date: Feb 2009	here we go . A1 (1632 x 920).jpg

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22nd June 2010, 10:16 PM	#2
PROFESSOUR2003 diyAudio Member Join Date: Nov 2009	hi can you upload a photo of that transistor who have 9 pins or either what`s written on it..

22nd June 2010, 10:20 PM	#3
moss99 diyAudio Member Join Date: Feb 2009	Hi yes it has on it : TDA1514A N9C0K1 HSH9930 7 thanks.. mark

22nd June 2010, 10:27 PM	#4
PROFESSOUR2003 diyAudio Member Join Date: Nov 2009	first check if there is short circuit between any two pins using DDM then measure the voltage on pins 6&4 wrt ground

22nd June 2010, 10:29 PM	#5
moss99 diyAudio Member Join Date: Feb 2009	I have them out of circuit so should i put them back in to test them ?

22nd June 2010, 10:34 PM	#6
PROFESSOUR2003 diyAudio Member Join Date: Nov 2009	check for short circuit between pins out of the circuit if there isn`t . put them back and check for voltages on pins 6&4 and also does it became warm while working .??

23rd June 2010, 06:58 AM	#9
Netlist diyAudio Moderator Join Date: Jan 2003	Please upload your pictures to this site. FileFactory does not work very well. /Hugo

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