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Old 22nd June 2010, 07:04 PM   #1
moss99 is offline moss99  United Kingdom
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Default 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..
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Old 22nd June 2010, 10:16 PM   #2
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hi
can you upload a photo of that transistor who have 9 pins or either what`s written on it..
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Old 22nd June 2010, 10:20 PM   #3
moss99 is offline moss99  United Kingdom
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Hi yes it has on it :
TDA1514A
N9C0K1
HSH9930 7

thanks..
mark
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Old 22nd June 2010, 10:27 PM   #4
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first check if there is short circuit between any two pins using DDM then measure the voltage on pins 6&4 wrt ground
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Old 22nd June 2010, 10:29 PM   #5
moss99 is offline moss99  United Kingdom
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I have them out of circuit so should i put them back in to test them ?
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Old 22nd June 2010, 10:34 PM   #6
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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 .??
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Old 22nd June 2010, 11:47 PM   #7
sregor is offline sregor  United States
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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
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Old 23rd June 2010, 06:32 AM   #8
moss99 is offline moss99  United Kingdom
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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.
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Old 23rd June 2010, 06:58 AM   #9
Netlist is offline Netlist  Belgium
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Please upload your pictures to this site.
FileFactory does not work very well.

/Hugo
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Old 23rd June 2010, 05:55 PM   #10
moss99 is offline moss99  United Kingdom
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Default here we go .

A1 (1632 x 920).jpg
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