Question about Polk Audio PSW202 Subwoofer

1 Answer

I have Polk Audio that connects Personal Computer but the TDA IC attached heat shank on the circuit board is damaged and removed. I will be glad if you can tell me the number of the said IC to enable me carry out repair works. Thank you. Ransford.

Posted by on

1 Answer

  • Level 1:

    An expert who has achieved level 1.

    Mayor:

    An expert whose answer got voted for 2 times.

  • Contributor
  • 2 Answers

ST brand TDA7294

Posted on Dec 02, 2011

1 Suggested Answer

6ya6ya
  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

Hi,
a 6ya expert can help you resolve that issue over the phone in a minute or two.
best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.
the service is completely free and covers almost anything you can think of (from cars to computers, handyman, and even drones).
click here to download the app (for users in the US for now) and get all the help you need.
goodluck!

Posted on Jan 02, 2017

Add Your Answer

Uploading: 0%

my-video-file.mp4

Complete. Click "Add" to insert your video. Add

×

Loading...
Loading...

Related Questions:

1 Answer

Sansui 21' ultraslim tv no sound. ic no tda 111350/n3/3


Check the speaker/s first. If found OK; check and replace the damaged component/s at its audio output section circuit board. If needy, replace this board as card basis. If you wish to get some details; check the site linked here. Viewing it in "Mosaic" or "Magazine" will make surf easy. Surf the site with patience. Pull up older posts. Surf the site with patience. Do a search by type in the brand name of your device at its search box.
http://electronicshelponline.blogspot.com/

Jul 17, 2014 | Televison & Video

Tip

How to find and replace a defective vertical IC.


When your TV works, has sound, good indicator light but all you have for a picture is a horizontal line across the screen, you have no vertical drive. This can be caused by the IC overheating or a power spike. In addition if you have a newer TV (projector) it may not turn on and will only blink an error code.

This is not a difficult fix but requires patience, good soldering skills and dilligence. Begin by unplugging the set and removing the rear lower area. Around the perimeter of the section you will see screws. Some will have arrows pointing at them. Remove all these screws and remove the rear cover.

Now you should be able to see the entire chassis. It will be mounted on a plastic frame and will consist of two or more circuit boards. The one, usually on the left, will be a small signal board. The one on the right will be the low voltage power supply, high voltage power supply and you guessed it, the vertical drive section.

The vertical IC is located near where the wires from the yoke which are red,green,yellow and blue terminate on the main board. The yoke is a large coil on the rear of the CRT which spreads the beam. It is slid over the glass CRT. Follow the wires (which should be green, yellow, blue and red to the circuit board. This will be the vacinity of the vertical IC. It will be mounted to a large heat sink and generally the designation begins with "LA" followed by 4 numbers. Panasonics generally begin with TDA.

Once located, remove and replace the unit. Removing the unit will probably require removing the circuit board. This involves removing all the screws around the perimeter of the board and any which you find in the center of the board. Do not force it, if it will not move easily look for and remove more screws.

You can get the replacement parts at http://www.encompass.com . Make sure you clean off the old heat sink compond and reinstall new heat sink silicone also available at the same web site. The heat sink compound facilitates heat transfer to the heat sink and keeps the IC cool. Generally the ICs are run at a high output and get very hot.

After replacement of the IC check all the safety resisters near it for continuity and also any and all diodes for integrity. These parts would be in the vicinity of the heat sink. Removing the IC may require prying it off the heat sink as many times the heat sink compound acts like a glue.

If everything checks ok you should have a working set.

If you do not have vertical drive, you will need a schematic to find the power source for the IC and test the circuit to see if it has the proper voltages.

You can sometimes get schematics from http://www.encompass.com but they do not have all of them. If you do not mind paying about $16.00 US you can get any service manual from http://www.servicemanuals.net .

Once the proper power is supplied to the IC you should have a working set.

Remember to use an isolation transformer anytime you are going to check voltages in the set. Modern TVs have the chassis attached to neutral making a 60 volt difference between the chassis and hot side. This means that if you do not use an isolation transformer and apply a DVM with a low path of resistance you will cause a direct short and blow the fuse, if you are lucky. Also remember to be careful when measuring voltages as there are lethal voltages in a TV when plugged in and running.

Thanks for using FixYa and for the great rating.

hardrocko

on May 11, 2010 | Televison & Video

Tip

Replace the kkz-12 power amp ic on kenwood car stereos


replace the kkz-12 ic[difficult to find expensive!]with the tda 7560!first desolder the kkz .have 27 pins.take the tda and cut the pins 1 and 25.replace the kkz with the tda now.let the pcb positions 1-2 and 26-27 pin empty.solder the ic put htc in the heat sink tight screws and check the unit!

on Mar 08, 2010 | Car Audio & Video

2 Answers

Polk Audio PSW202 subwoofer. Replaced burnt fuse but blows the next fuse after connecting to amplifier and powering on. What else can I do?


Fuse probably went bad because either the large filer capacitors at the edge of the PCB went bad and or the final output IC mounted on the heatsink(15 pin) fried. Check the capacitors and all the semiconductor components on the board for burn marks or corrosion. You have to remove the heat sink clamp from in front of the output IC to adequately visualize its condition. In fact you might have to remove the large aluminum heatsink attached to the chassis to get a good view of the IC. If it or the heat sink clamp show signs of thermal burns you need to replace it. The IC is a TS TDA7294 mono audio amp available at Mouser Electronics. Replace the 35V 4700mF caps with 50V 4700mF caps. You will only have enough space on the top of the PCB for one of the larger caps. I mounted the other on the circuit side of the board. Note the polarity of the original caps and respect it in their replacements. The fuse is a 5 X 20 medium speed slow blow 250V 2.0A glass fuse.

Aug 17, 2010 | Polk Audio PSW202 Subwoofer

1 Answer

How to change amplifire?


Amp is most likely an large IC mounted on a heat sink.Remove its mounting screws remove solder from the ic pins on circuit board ,install, mount, and solder in new IC ,install cover and unit should work if IC was only problem.Check for burn't parts,damaged circuit board copper runs.

Oct 06, 2009 | Alpine CDA-9883 CD Player

1 Answer

How to remove horizontal lines for dvd player


This is a common problem and is either bad connections at the vertical Ic or a defective IC. Look for a small flat Ic attached to a heat sink with 9 pins or so. It should be marked LA7837 or similar. Resolder the pins and try again. If that fails, replace the chip. That should fix it. You may also need to replace some capacitors in the same circuit if the picture lookes stretched or otherwise off. The Ic should be labeled on the board as ICxyy. Capacitors in the same circuit will have the designation Cxyy. Change the Caps that have the same x designation.

Nov 07, 2008 | Televison & Video

5 Answers

Ic used in which section of philips TV kit


tv set no sound coming.i replce sound out put ic but not hasbeen coming .i think 9370/1665 ic in side a/f out put line is gone i have a this curcuit daigarm not avilable so pl help this point

Oct 10, 2008 | Televison & Video

1 Answer

My Alpine CDM 7871 produces no sound other than through the pre-amp outputs. As as a result the only sound I am receiving is from the sub-woofers in the trunk. None of the speakers within the cabin of the...


Your problem is the amplifier IC inside the unit. It is attached to the heat sink and soldered onto the main circuit board. If you have a soldering iron, solder, and solder wick (to remove solder from bad IC) you could do this repair pretty easy. You would need to disassemble the unit and remove the solder from the IC, then remove the IC from the heat sink and attach the new IC to the heat and put it back into the board and then solder all the pins of the new IC back onto the main board. After that, just put the unit back together just the way you took it apart. Just pay attention to where all the screws went and make sure you get them all back in the right places.

If you do not have the soldering equipment and are not comfortable with your soldering skills it would be better left to a service center to do this. Just about any service center would be able to do this repair for around $100. That should include the part and the labor. The price will depend on the service centers rates, but it is an easy repair that would require less than 1 hour of actual labor. Most shops will charge a minimum of 1 hour labor even if it only takes 15 minutes.

I have been repairing car audio equipment for over 18 years and can assure you that this is the problem you have, it is the typical symptoms for a bad amp IC.

Feel free to ask any other questions by just posting back on this thread.

Dave

Sep 20, 2008 | Audio Players & Recorders

1 Answer

I attempted a repair on my pt-53tw53 by replacing the 110 ic chip ( the one on the diagonal heat sink) but, I think I did a bad job of soldering. When I tested the set when turning the power on the set...


You can repair any of the traces with small wires from the affected pin to the next componnent on that trace. To remove the board label all wires that you disconnect. There are "bridge" connectors that connect the signal bd and main bd. these lift up off the main board and will stay attached to the board youre working on. If you need further info please let me know. Also use solder wick to remove the solder and get a small tip solder iron 30watt from radio shack. The proper way to solder is (1) allow the iron to heat up. (2) touch the hot tip to the pin on one side and then briefly touch the solder to the other side of that pin so the solder flows around the pin. Use the solder sparingly so you dont bridge the pins with solder. (3) always check your work with a magnifying glass to insure the pins arent bridged.

Apr 09, 2008 | Panasonic PT-53TW53 53" Rear Projection...

Not finding what you are looking for?
Polk Audio PSW202 Subwoofer Logo

193 people viewed this question

Ask a Question

Usually answered in minutes!

Top Polk Audio Audio Players & Recorders Experts

 Grubhead
Grubhead

Level 3 Expert

5047 Answers

The Knight
The Knight

Level 3 Expert

74106 Answers

ed_dantes

Level 1 Expert

7 Answers

Are you a Polk Audio Audio Player and Recorder Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides

Loading...