my teac amp has distorted sound. when i check the input pins 1 and 2 sound is perfect. outpin 1 and output pin 2 is distorted. i have checked voltage and Vcc+ is nearly 15 volts and Vcc- is only -0.2v is this right? or is the op amp faulty? anyhelp with be appreciated!
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Re: Help please Ne5532a op amp chip
Vcc- could be connected to ground, if its not then either the -15 is missing or the ic is loading it down, I suspect the -15 volts is missing, post the model number, someone might have the schematic.
what is the resistance of the -vcc pin to ground? trace that pin and see where it goesLast edited by R_J; 07-08-2015, 07:22 PM. -
Re: Help please Ne5532a op amp chip
ok did some test input voltage on N transistor is 3v and 25v on P transistor!!
the resistor marked 100 measures different but could be due to mounted on board. all the diodes test fine only tested on board.
Transistor resoldered.
whats you guys think?Attached FilesComment
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Re: Help please Ne5532a op amp chip
sorry its ohms not kComment
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Re: Help please Ne5532a op amp chip
This is like going to the autoparts store and asking for parts for a Ford.Comment
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Re: Help please Ne5532a op amp chip
i do need to test transformer, will do that tomorrow evening.
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Re: Help please Ne5532a op amp chip
From here, they look more like 3 pin regulators.Comment
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Re: Help please Ne5532a op amp chip
How about the straight shots pictures of the boards, both side, the pictures of how all the boards are connected together, the model number of this product you are working on.
Please remember that we do not have the unit or the boards in front of us to look at.Never stop learning
Basic LCD TV and Monitor troubleshooting guides.
http://www.badcaps.net/forum/showthr...956#post305956
Voltage Regulator (LDO) testing:
http://www.badcaps.net/forum/showthr...999#post300999
Inverter testing using old CFL:
http://www.badcaps.net/forum/showthr...er+testing+cfl
Tear down pictures : Hit the ">" Show Albums and stories" on the left side
http://s807.photobucket.com/user/budm/library/
TV Factory reset codes listing:
http://www.badcaps.net/forum/showthread.php?t=24809Comment
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Re: Help please Ne5532a op amp chip
Hello to all...just to add regarding the op amp fault...you can remove it and check the voltages within the circuit. with out a schematic to hand rail volts can be +/- 12 to even 18 volts..start at the psu for even rails. have to touched the ic to feel if it gets warm warm when the item is powered up?.. check volt regs aswel.Comment
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Re: Help please Ne5532a op amp chip
hi guys tried to replace chip on amp and totally messed it up. it was the input selector chip. I read on some forum these chips usually fail. wish i tried other things to fix first now i get no sound. i have moved on since hence the updateAttached FilesComment
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Re: Help please Ne5532a op amp chip
thanks for all that helped!Comment
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There are some specialty tools needed to do this task. The replacement MEC1503 chips can be acquired from Aliexpress. Do not buy the bare chips as... -
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Common SPI bios chip programming Questions and Answers
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Q: Why is my bios chip unreadable ?.
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