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Power ic not working

No output

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  • Kenwood Master
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What model ?

Posted on May 19, 2013

Testimonial: "i have a kenwood amplifier model ka-990ex,i try to fix it and i have found that the relay is not working"

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My zoom g1x theres no sound.all power are working lcd light are on.but the sound cannot come out.can any one help me..


What letters / numbers that appears on the screen?
If the display is normal, and you can switch to other banks, and can edit each bank, then the problem of no sound, is at the pre-amp IC input, output amp, or CODEC converter.
This is the overall image of G1X inside.zoom-g1x-theres-no-sound-all-power-2ss5ycyvkoajtv035dpuezke-2-0.jpg Next, we zoom-in the middle of picture above.
See the next picture.
IC2 (left) is input pre-amp IC (NJM2100).
IC4 (middle) is the CODEC IC (WM8734).
IC5 (right) is the IC output (NJU7082).zoom-g1x-theres-no-sound-all-power-2ss5ycyvkoajtv035dpuezke-2-1.jpg

Test whether the input IC is working normally, turn ON G1X, plug the guitar, go to BYPASS/TUNER menu. When the TUNER function could work, certainly input IC is not damaged.
Means only two possibilities, namely CODEC and output IC. That is not easily tested, except in specific ways.

May also, there are problems in the input / output socket.
Turn ON G1X. Try the following (see figure below):
  • Test the output socket. Touch pin output socket (right red arrow) with finger / screwdriver / whatever. If sound is heard in the amplifier, the output socket is normal.
  • Test the input socket, Same as above. (left red arrow). (if this happen in this point, problem is clear).
zoom-g1x-theres-no-sound-all-power-2ss5ycyvkoajtv035dpuezke-2-3.jpg

NOTES:
If lcd light are on (as you say), but appearing G1 or d5 or bt, and the system are hang / frozen, this is a different issue to the one described above,and dealt with in different ways too.

References IC datasheet:

NJM2100.
http://www.njr.com/semicon/PDF/NJM2100_E.pdf
NJU7082
http://www.datasheetarchive.com/dlmain/Datasheets-22/DSA-439015.pdf
WM8734 http://www.cirrus.com/en/pubs/proDatasheet/WM8734_v4.4.pdf
.

Sep 10, 2015 | Zoom Music

Tip

No sound, video OK in TVs


PICTURE IS OK AND THERE IS NO SOUND IN tvS

There are some occations arise when picture in a TV will be OK while absensce of sound.
Picure is OK, means that, functions from tuner upto video output, including power supply are OK. In most cases absence of sound may be with the fault to its speaker or speakers. In some sets there will be two speakers connected in series connection, and its sound output will be MONO. In these type of sets, if the connction is done as above, even one speaker has gone out [that is its voice coil or its connection gets opened, both speakers will not work]. In this case, you have to check each speakers individually for coil conitnuity, and the faulty one must be replaced. If there is no fault to the audio amplifier section of that TV, the problem will be solved with this.
In stereo sound system TVs, two of its speakers will have individual amplifiers, some may have both amps sections are integrated in one IC or two ICs are used seperately for each channel. In this type of sets, absenece of sound can be either to the fault of the failure audio output IC or its supply line voltage. In most cases, you can make sure the reason with a simple test without opening the set. Place your ear very close to its speaker side, and switch ON the set by its front panel power control switch. if a "Thumb' sound is heard form the speaker, you can confirm that the speaker is OK, and the power supply is comming to the output IC. If so, check the output IC terminal solderings for some loose contact. During long run, this may happen because, the Audio Output IC will heat up during working, and repeated heating and cooling may make loose soldering at its terminals; or a loose fixation of the IC to its metal heatsink, will relult overheating the IC. In most cases this is found a common fault. To rectify this, you have to open your TV, and pull out the audio output card, in some sets, this audio output section swill be built on the main board itself, place it upside down, and resolder all the terminals of the output IC by applying a little more solder, without making any solder bridges in between terminals of the IC. If this also doesn't help you, check the input voltage of the audio output IC. In most sets there will be a fuse resistor used as protection, will be in 0.2Ohms in value, and will get opend thus disconnect the supply; if IC has some fault. This will happen when the output IC itsef get shorted. If you see this resistor opend, check the output ICs positive supply rail terminal to the negative terminals' resistance with the help of an Ohm meter, if foud very low, say between 0 Ohms and 5 Ohms, make sure that the IC has got damaged. Here you have to repalce the IC and this fuse resistor too.
When replacing the audio output IC, make sure to apply thermal conductive paste, in between IC and it heat sink. This conductive paste can be bought from most of the electronic spare part selling shops at your town.
There is an other possibility too, is, the audio filtering stage in the video IF stage get faulty. To detect this, you have to go to the VIF section, and it is a skilled job, and the worker must have sound knoledge in electronics, and service experience.

on Mar 21, 2011 | Televison & Video

1 Answer

Im trying to repair a Bx4500h. there is not output, the preamp sections works and the transformer works. I tested both. Im thinking its a problem with the 3080 IC underneath the amp board. Theres 2 cables...


Well, first off, if this is an IC output, depending on the rated watts per channel, you will certainly need a rail volt greater than + - 15V. That would be for a regulated voltage somewhere else in the amp.

Mar 07, 2015 | Audio Players & Recorders

1 Answer

Is audio output (from main ic) is imputed in utc2003 audio amplifier ic?


Is the UTC2003 IC your main IC?
You can't find inputs or output of this IC?
This IC is power Operational Amplifier simply. It has TWO inputs noninverted = pin 1 and inverted = pin 2 and ONE output = pin 4. Pin 3 is ground and pin 5 is supply voltage. It's simple as the rake! What is your problem? Sorry for my rusty English...

Feb 03, 2015 | Audio Players & Recorders

1 Answer

I have a Pioneer VSX-305 receiver. I blew channel A speaker outputs by allowing speaker wires to touch. Everything else works. Can anyone tell me what it takes to fix this. (I am an electrical engineer...


Without a Sams Photofact or a service manual I would go directly to the Power IC which is the largest Integrated Circuit mounted to a large heat sink. If you see any fuses they are probably for the power supply since any fused circuit on the speaker output would be ineffective because the IC would be damaged before the fuse would blow, but you need to check them anyway. Since the short was at the speaker output your problem should be at the final stage of amplification, which is the Power Amp IC. Prior to the early 70's you would have transistors mounted to a heat sink which could be individually checked and replaced. Then manufactures started to use the Power Amp IC which are more costly but eliminate having to find matched pair transistors. All you can check on the Power Amp IC is if you have an input using an oscilloscope or signal tracer and the power to the IC. If you have an input signal and power to the device with no output, I would replace the IC. Unless you have a test circuit for the IC you cannot test it completely unless you have a device like a Huntron Tracker or build a test circuit using a signal generator and a power supply to measure the gain of the IC with an oscilloscope. Short of ordering a service manual this is a good place to start.

Aug 15, 2011 | Audio Players & Recorders

1 Answer

I have sony J21mn11. problem not power on only red lit led only.i check all the components on the power supply area and horiz. output D1878 all are good. there is power IC STR S6707 on power supply area. i...


If you have a digital tester or analog try to check the voltage reading from the power supply if high or low or no supply.Check first following voltage location and section. * Check the AC voltage from ac cord to fuse and before the bridge type diode. * Check the DC voltage after the bridge type diode.if normal voltage. * Then check the voltage into the filter capacitor to regulator ic.the power ic.If theres a input voltage in the power ic,check the output voltage going to harizontal output.If no output the problem is you power output.You need to replace it.

Jul 12, 2011 | Sony Televison & Video

1 Answer

No power whatever


Check voltage output of the power supply.
  1. If below the indicated voltage on the output terminals, replace the capacitors across the output terminals with the same specifications.
  2. If there's no voltage output at all and the fuse is intact, replace the 8-pin power regulator IC with same specifications.. It is usually DH321 IC.

Sep 26, 2009 | Philips CDR770 CD Recorder

1 Answer

Power supply in stsandby mode. onlky 35v panasonic


first try change your vertical output ic check the horizontal output ic but i suspect your system ic is fault it is very hard to find the part and exspensive too

Jun 30, 2009 | Televison & Video

1 Answer

Pioneer Elite pro 99


most likely the vertical output ic making the CRTs blank. Try resoldering the Output IC, if that doesnt work you may need a new Vertical IC

Apr 04, 2008 | Pioneer PRO-200 60" Rear Projection...

1 Answer

F61


Output IC is defective.Not much to do except have the main unit serviced.Output IC is rather costly.Before taking it for service, disconnect all speakers and power on.In F61 comes up IC is definetly bad.If unit works reconnect 1 speaker at a time(with power off) and retest each time.Repair bad speaker .

Nov 27, 2007 | Panasonic SC-HT740 System

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