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Circuit ICs were heated and blow now I need a replacement.

Tda7295
tda7265
L7809cv
full details and guidance is required
the last mentioned IC heats up too much.
Any alternative ICs.

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Lot of noise make


Seems it is getting bad when speaker heats up
Audio out ic may be partially defective
Cant say exactly the reason without checking
Need to check individual component
Try to investigate
thx

Oct 12, 2012 | Dell WL6000 Computer Speakers

1 Answer

Which way does the rear fan go in a compaq computer tower


The proper installation of a CPU fan is often the subject of debate. Though there are conflicting theories as to which direction the CPU fan should face, there are methods to ascertain which CPU fan installation best suits your needs. The determining factors of your CPU fan installation direction include the manufacturer specifications, your case design and the specific design of your heat sink
Horizontal Installation
  • The installation of a CPU fan horizontally to the plane of the motherboard is the most common installation orientation there is. Your options when installing your CPU fan are to blow cool air onto the heat sink or to pull cool air through the heat sink from the motherboard. Horizontal installations show negligible advantages in either installation direction. The differences in temperature usually vary by only 1 or 2 degrees Celsius. The main point to consider when installing a horizontal CPU fan is the location of the rear exhaust fan on the case. If the rear exhaust fan on the case is parallel to the processor, it is advantageous to have the fan pull cool air from the motherboard and push it out above the heat sink. This is because the case fan will quickly draw that hot air away from the CPU and out of the case, allowing for quick cooling.

Vertical Installation
  • Vertical, or tower, heat sinks rise high enough off the motherboard to allow for a fan to be installed perpendicular to the plane of the motherboard. This allows for cooling to go from the front to the back of the case, as opposed to going from the bottom to the top. Optimal installations for vertical heat sinks are blowing toward either the back or the top of the case. If there is no exhaust fan in the top face of your computer's case, it is more effective to orient your fan on your vertical heat sink so that it blows toward the rear exhaust fan of the case. If there is an exhaust fan on the top face of your computer case, it is almost always more effective to mount your CPU fan so that it blows air up toward the top of your case. The reasoning behind this is that hot air rises and will more naturally flow off the top of your case. Also, top-mounted fans are usually larger and allow for faster airflow out of the case.

Manufacturer Recommendations
  • It is often the case with nonstock heat sinks that the manufacturer has designed the heat sink's fan to be mounted in a limited number of orientations. This is usually evidenced by limited mounting notches on the heat sink itself. Most aftermarket heat sinks use technologies such as heat pipes that have specific cooling needs to operate appropriately. Because of this, it is important that in any CPU fan installation you follow the manufacturer's installation instructions.


Performance chips of BMW

May 31, 2012 | Compaq Hp - 375376-001 - Dc7600 Tower...

1 Answer

My subwoofer IC got burned because i accidentally plug it to a 220v power supply, mine is only 110v i want to know the IC# subwoofer.


Most likely what got burnt is the bridge rectifier in the power supply section of the electronic circuit. This usually takes the shape of either a single 4-legged IC, or a group of 4 rectifying diodes connected in a bridge configuration. If you disassemble the unit to which the power cord is attached & trace the circuit starting from the terminals of the power chord, you can easily identify it. You will need to replace the 4-legged IC or the 4 rectifying diodes.
You will also need to replace the fuse, since it is usually likely that it gets burnt if the unit is attached to 220V instead of 110V.

Nov 24, 2009 | Altec Lansing FX4021 Computer Speakers

1 Answer

Acer 3680 powers on, displays acer screen, and then fades to black, can faintly see that image is there. tried external monitor, same result. dismantled checked all connections. what next?


probably itz either minor case of software corruption/improper ground/cpu fan..
or major case of faulty or defective main board/ram/daughter or addon card(s)..

..plz do check the following as in order:..
the Hardware part:..
1)a) inpower on mode, open/unplug the data/vga cable of the monitorfrom cabinet..see if raster or 'osd' is appearing on the monitorscreen..if so monitor is ok..else replace the monitor and see..[notapplicable in case of laptop]..
b) in case of laptop try to getoutput from external display unit/monitor using vga port..if there'sproper display in there..the problem is probably with either the 'lcd'or 'ccfl' or 'inverter circuit'..

2) if u hv a graphics card, replace with a standby or onboard and see..[not applicable in case of laptop]..

3) unplug mains supply..pick open/remove the cmos battery..check (above +3v)..resit..

4) see ifthe ram(s) is loose/faulty..open clean/remove carbon & oroxide formed on the teeth with an eraser n resit it..or replace with astandby n see..

5) a) see if ur hdd is noisy or emitting any 'ticking' noise (like 'tuk tuk' or 'kirr kirr')..
b) or if the system is not supporting either the newly installed device or itz software/driver /firmware
if so, u need either a fresh os installation or ur hdd is likely to b replaced..

6)remove/cleandust neatly..dust is non-uniform in nature n may cause jam/shortcircuitry/excess resistance n many more..resulting an increase in heat..

7)open the CPU Heat-Sink with fan out of the socket..put some "Heat SinkCompound" (available in local electronics chip level spare market)between the cpu/processor and the CPU Heat Sink *** fan..resit/fit ittightly in position..

8) on main/mother board..see with a debugcard for mb error..may b short..look for defective capacitors(espabove1000mfd)/mosfets..go through the mb's south bridge n the circuitlie around atx connector..the crystal clock generator (if cpu isn'theating up)..

9) [in case of desktop] the smps itself may bdefective/faulty..check the outputs of smps viz. 0v (black~ground); +12v(yellow); +5v (red, green~ps-on, violet~pg& grey~sb); -12v (blue);-5v(white); +3.3v(orange)..the 'oscillator and error amplifier ic',or pwm switching regulator circuit..look fordefective protector-transformer/resistance (esp 4.7k)/mosfet..
check the battery n adapter [main power], in case of laptops..

the Software part:..
1) hva licensed and UPDATED antivirus installed (i prefer avg/kaspersky,remember, without updation a full version antivirus is useless)..

2) download, install n run microsoft kb890830..http://www.microsoft.com/downloads/details.aspx?FamilyId=AD724AE0-E72D-4F54-9AB3-75B8EB148356&displaylang=en..

3) download n run Startup Control Panel..http://download.cnet.com/Startup-Control-Panel/3000-2094_4-10039330.html..'remove allthe unnecessary startup items from here..(if u can't find what toremove, post me/us in ur comment with all the items listed in each nevery tabs herein)..

4) remove all unnecessary software from add/remove programs..

5) download, install n run 'Advanced System Care Pro'..http://download.cnet.com/Advanced-SystemCare-Pro/3000-2086_4-10399324.html..

6) disable the following:..
a) 'AutomaticallyRestart' right click onmy computer->properties->advanced->startup nrecovery->(un check on the) Automatically Restart;
b) 'ErrorReporting' right click on mycomputer->properties->advanced->errorreporting->disable error reporting->(uncheck on the) 'but notifyme when critical error occur'..

7) Increase the size of Virtual Memory, Initial: 1440; Maximum: 2880

if u r not a professional, always better to seek advise from ur system admin/vendor....

Nov 19, 2009 | Acer Computer Speakers

1 Answer

My left speakers of both altec lansing 2.1 channel and zebronic headphones are not working.i tried increasing the volume in the option "sounds nd devices" in control panel bt still the problem did nt...


It's the power amplifier, the left side is burned out.Open the main box where all the cables connected to the main box.
Check for the IC with Heat Sink, then locate the left side output source from IC.
Then replace it with new ones, and also don't forget to see if there's any weird things happen such as burning smell, overheating, or anything..

Oct 18, 2009 | Harman Kardon HK19.5 Computer Speakers

2 Answers

Rippling vibration in sub woofer seems to be transformer related


The power supply outputs DC voltage so there is a 2200uF cap inside it.  If this goes bad you get a humming out (usually from the base speaker) even at minimum volume.  Inside the base there are 3 TDA2007a 6 + 6W stereo amplifier 9 pin inline ICs, one voltage regulator IC, 5 other ICs, 2 more tiny transistors, 1 2200 UF capacitor, plus a bunch of small caps. Usually one of the TDA2007a amp ICs has gone bad (in my case it was the one that drives the base so the popping sound was coming out the subwoofer).   The TDA2007a seems to be a faily common audio power amp IC.  The main problem with the Altec Lansing AVS500 is that there are no screws to be able to take apart the base so you have to brute force pry it apart and then the jacks and controls are also glued onto the front plastic face of the subwoofer so that must be carefully pryed apart also to get the small circuit board out to be able to work on it.  It's all too easy to break something if you're not carefull, but what the heck, if the speakers aren't workiing you don't have anything to lose and if you are proficient with a soldering iron and have or can get a TDA2007a audio power amp IC you might be able to repair it.   My own speaker problem was easy to determine as one of the TDA2007a was overheating super quickly after plugging in the power.   Good luck to anyone else attemping a repair.

Jun 24, 2009 | Altec Lansing AVS 500 Computer Speakers

2 Answers

Fuse blows after turning on control center


I have a similar problem on the Gigaworks S750 system. Upon opening, I have found that the IC driving the switch mode power supply becomes basically a short, and that the transformer becomes damaged as a result there of as well. Then you have about 22 Ohms connected to your mains (after the bridge rectifier) which causes the fuse to blow. Is there anyone that can assist with a circuit diagram for this system, or of contact details as to where I can find out what the specifications of the transformer is? Can not seem to find any technical assistance in South Africa

Jun 17, 2009 | Creative Labs Gigaworks S750 Computer...

1 Answer

Fuse issue s750


I believe that you are referring to the small yellow ceramic capacitors on the amplifier boards that tend to short out. Below I have pasted a link to a forum thread that contains the information you are looking for as well as some great pictures of what you should see. The driver IC that you are referring to I am guessing is the STA575 amplifier chips which are located on the amplifier boards attached to heat sinks. One board has 2 of them the other has 3.

http://forums.creative.com/creativelabs/board/message?board.id=speakers&thread.id=8037&view=by_date_ascending&page=16

Aug 31, 2008 | Creative Labs Gigaworks S750 Computer...

1 Answer

Fuse blows


once the caps blow they usually take out the driver ic too.
check across your power to the amp with ohmmeter
when you find the issue it will drop to around 20 ohms in one direction.

Apr 24, 2008 | Creative Labs Gigaworks S750 Computer...

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