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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This is a guide that I am writing for helping others to replace their MEC1503 EC chip if it breaks (or to get around an inconvenient prompt to the BIOS). This forum has been extremely helpful to me so I would like to contribute to help others. I will tell you right now that this task is very difficult to do. You MUST have experience and tools to do precision micro-soldering, BGA reballing, trace repair, and general laptop repair skills.
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... -
Common SPI bios chip programming Questions and Answers
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Q: I have a bios request,i can`t post my backup as i can`t read from the chip.
A: If you can`t read from it how do you expect to write to it ?.
Q: Why is my bios chip unreadable ?.
A: The programmer is faulty or has a worn or broken zif socket.
The USB cable is frayed,connector pins worn or some other physical damage.
Not enough amperage or voltage to power the programmer properly.
Bad...09-02-2021, 04:40 PM -
Long story short:
- dad converted Asus Chromebox CN62 into Windows compatible, with mrchromebox BIOS, years and years ago
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- too lazy to remove the board from the case, thought a voltage regulator was the BIOS chip (you know... it has 8 legs)
(seems like the story was not that short)
He used alligator clips to read the chip. No luck reading it. Removed chip and placed on a SOC-8... -
Hello, anyone here have updated ezp2023+ chip database in .dat file format.
I need to add w25q256jveq chip but I do not know what data should I type.
I'm using the ezp chip dabase editor posted from here https://www.badcaps.net/forum/troubl...ro-programmers
The currenty unit model that I am trying to detect is HP elitebook 640 g9 which is currently locked on admin bios....11-25-2024, 12:53 AM -
Thanks for any help. The board version is DAZAARMB6E0 REV: E. The bios chip is winbond 25Q64JVSIQ1736. W25Q64JV is not available in AsProgrammer -- only BV CV FV or FW_1.8c. The chip won't interface with asProgrammer and a CH341A. When I have this chip on the board, the laptop will not post but when I plug it in to power, the blue LED lights up, also the orange when the battery is connected. When I push the power on button, keyboard backlight turns on and the fan starts briefely then turns off. But I can't do anything to program this bios chip so I bought another one.
The BIOS...
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