Altec Lansing ACS45.2 Repair
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- เผยแพร่เมื่อ 9 ก.ย. 2024
- Replacement of failed volume control IC in Altec Lansing ACS45.2 speakers. Replace the defective 16-pin volume control IC chip labeled PT2256. It's a bad Chinese-made imitation of the original Toshiba TC9235P.
Same story here. Bought these speakers decades ago and just replacing the chip fixed them! Thanks
Thank you so much for sharing this, saved the acs 45.1 from being thrown away. Thanks again 😊
Glad I found this video! A $7 chip and a crash course of soldering and my Altec Lansing is kicking again! Thanks! 🤘😁🤘
Bought my Altecs in 2000. They finally went kaput this year. Until I found your video. Ordered the Toshiba chip and they're alive again.
Just wanted to say thank you for sharing this. Not many people take the time anymore to diagnose electronics.
Great job
Wow, thank you, i did this repair last night, and now the 15+ years old ACS45.2 working great. Both PT2256 and Toshiba TC9235P sold at the same price here in mainland china, arround 0.4 bucks each, the shipping cost me 1.6 bucks (china mainland).
I did this repair yesterday and now they are working great. Bought the chip on eBay for 4 bucks delivered. The hard part was getting the old chip out. I used desoldering braid and it worked fine, just tedious. Thanks!!
+beckes1 Awesome! Another system saved from the landfill!
A quick little tip for anyone having a hard time removing old solder. Before desoldering it's a good practice to add a little fresh solder to the joints. This helps melt the crappy lead free solder they use at the factory.
The only issues I've had with Older Altec systems is the capacitors bulge and you get the nasty hum, easily fixed for a buck or two and now I actually make money refurbishing these old speaker systems. They still are hands down the best sounding PC speaker systems within a fair budget. The ACS 250 sub paired with Acs 40's or 400's were the best bang for the buck versions.
Thanks for the cool repair video man!!!! I have to get mine working properly now!
Thank you just saved my ALTEC ACS495, bangin again! 👌🏼😎
You couldnt have been more correct sir! Thats EXACTLY what the case was with Altec. My father worked there when they made these and it was engineers vs bean counters constantly! Countless customers were given replacement systems due to this kind of tom foolery. You really cant find good PC speakers on offer today, aside from the Klipsch pro-media, and even they are of a 20 year old design now.
Just hooked up an old set in my garage. They were working fine and when I moved them up on the shelf that I built they quit working. I took them apart, checked the fuse and the voltage out of the transformer...all ok...after I put them back together everything worked fine!
and they are perfect!
How to identify the damaged component or part if there is no sound but has a power? Same speaker model
thank you! now i can fix mine
Hi - thanks for this informative vid! Is there a way to control volume without the satellite speakers? In other words, use the subwoofer with a different pair of speakers? Thanks again.
Help please! My Altec Lansing ACS 45.2 Multimedia Speaker System w/ Sub. & Power Supply stopped working July 4th 2023 after lightning struck the house...maybe it's just a coincidence and it was the unit's time to die, but I did have perfect sound and operation just before it happened - after it happened, very low sound, unable to power off or on and can not adjust volume. Luckily my 13 year old Frankenstein PC did not also get fried. This unit has sentimental value to me, it was originally my deceased brother's, so I am not wanting to toss it out and say goodbye to another piece of him...I want to get it fixed please and I know full well I won't be able to do the repairs myself any longer. Where would I even attempt to get this repaired?
How did you get the subwoofer/amp case apart? I got all 8 screws out but the damn thing still refuses to be pried apart with a spudger. I don't see any additional screws. What am I missing here? Is there more screws hidden away? Some kind of plastic clips intergrated into the case?
hi, can you help me open the case of altec lansing lifejacket 2. Im not able to find any helpful links online. thanks.
I have some ACS45 desktop speakers and the volume UP button went out. Im assuming that i might just need to use some contact cleaner maybe? Mine dont seem to be able to be taken apart as easily as the higher acs models though
i just took my speaker apart to look at the volume control (having the same problem with UP). i disconnected the cable from UP and swapped it over to the DOWN switch to see if that would work ... no luck yet though. next step is.... open the sub? i dont know. im so sad i ever touched the down button because it was at the perfect volume :(
Hi, How does this setup differ from the Altec ACS 65i? I'd like get mine working again, thanks! It's the 6.5 that's very weak (hardly nothing coming out). Small speakers sound okay.
I have a first version of ACS45 that can power on but the volume does not work. I wonder if i could fix it the same way?
So if i own these speakers and the volume doesn't go up and down with the buttons, and it stay on all the time, it's most likely because of that chip?
I have an Altec Lansing ACS340. The sub woofer has power (no sound), but the power switch on the right speaker won't turn on won't turn on. Would this also be due to the faulty sound chip or a bad switch?
my altec lansing vs4121 no power. I already checked the transformer, the voltage is going fine to the board. But no power when switch on. Any idea why huh?
I have an IBM clone of this that is about to wind up in the trash. I think the vol control IC was "refactored" into the right speaker box. It appears not to be user serviceable :-(
Seems the repair already took place, I musta missed how you removed and installed the chip. Do you have a vid show how it's done?
hi, i need help with my altec lansing mx6021, it has no power all of a sudden. i dont know why. so i thought you might have any idea what's causing the problem.
please help me to find pin outs altec lansing mx5021..my main controller unit is missing..ple help to create it..
Weird mine has the toshiba chip already on it but same problems.Sometimes power doesn't come on and I can't turn the volume up, only down..which sucks lol Any idea?
Mine also had a real toshiba chip; I replaced the chip anyway and it's still doing the same thing as well. It will turn on when you plug it in after it's been unplugged for a long time but it will not turn on again after you turn it off.
I have the BX3 Altec sub with the 2 small satellite speakers they have sound but the sub just buzzes like AC hum (any answers)
Hii..Greetings from India.............I have Altech Lansing AVS300B 2.1 SPEAKER SYSTEM........A strange continuous cracking noise is coming out from my subwoofer......Strange noise's volume increases if volume of subwoofer is raised.....2 Satellite speakers are working fine....Noise continues even after disconnecting Orange colored input wire to subwoofer..........Kindly suggest a solution
if you open the speaker, you can put it on water again? it has some sealer?
yea i have the altec lansing boom jacket imw576 and the charge port is broken off it ,it uses the 3.5mm usb port for charging is there any way i can just wire a standard port right onto the board ?
and how would i know which wires to wire into it has about 9 going from the small circuit board holding the 3 ports on outside ,, to the main board
I have this same model of speakers (ACS45.2), the other day they stopped working completely... I hear a buzzing from the subwoofer, but the LED between the volume buttons will not come on... Is this enough information to determine what is the problem? I do own solder and gun, I will have a go at fixing it if I know what is the problem. Thank you if you can help!
If I had to guess it would be the volume control IC has gone bad. It could also very well be that a capacitor has failed which can cause that buzzing. Open up the sub woofer and have a look at the board.
Wonder if this will fix my im7. Batteries wont even lite it up.
how to fix the dc charge part on my altec lansing boomjacket
do know any about altec lansing ada885 speaker ? After about an hour the sound off and on
What was the issue with your Altec Lansing? Why did you replace the control chip? Mine is making some loud noise
buzzmeok It started with with the audio being distorted. Then later they lost all volume control and then power. The PT2256 IC in these speakers controls the power on/off and volume. A link to the data sheet if you'd like see how the chip works. www.datasheets.pl/integrated_circuits/T/TC/TC9235F.pdf
What is the easiest way to disconnect the sub at the Molex connector? I wound up unsoldering the jack, which defeats the purpose of the jack. I found it was easy to use a Panavise on the board once the sub was not connected.
It's been a few years but I don't remember disconnecting either the sub or transformer wiring when I did this IC replacement.
Disconnecting the sub made it easier to get the board into a Panavise to hold it steady. The 4011 was also part of the problem, since it wasn't always telling the 4013 to flip, due to cold solder near the DIN connector. Once I got that soldered the power LED flips on and off with the two buttons, like it's suppossed to. Waiting on the Toshiba Chip from China to finish the job. I also socketed the 4011 and the PT2256 replacement. It's nice having free time when you're retired.
Got the new chip in. One channel level works correctly, the other is not changed by the up down. Got a schematic?
Got it fixed. The load resistor on pin 4 had lost ground. Rare that a land loses conductivity but it did.
Sorry I sure don't.
Hopefully you can help me. My pin connector that supplies the power and audio to the right speaker crapped out and I ordered a new end off of ebay for like $2. I was wondering if maybe you knew what color wire goes to what pin hole in the subwoofer.
+Dan Miller I don't have a clue as to the pin out on that plug sorry.
+Beach Tech no problem, it was worth a shot asking. I've got at least a month to figure it out. If only I knew how to properly use a multimeter lol.
Hey, in my acs 45.2 im getting a distortion problem. The sub works fine but after a certain level of volume the right and left speaker distorts. Any help or advice on this problem will be greatly appreciate :)
Distortion could be from many things including the volume control IC. Could also be bad caps or a bad audio amplifier IC.
hi brother i need your help to find out an alternative IC Chip for SJ3358 unfortunately its not available anywhere, can you please help me as i want to fix my Altec Lasing 5.1 speakers
Have you checked alibaba.com? May be your only hope besides ebay.
Hi. I have an Altec ACS45 and can't switch off by pressing the two volume control buttons however my board looks pretty different and I have two audio inputs. The volume controls themselves work. I have the Toshiba chip you mention but at U1 but none of the PT2256's. Could it be the TA8248K chip that's failed? (it's screwed to the heat sink). I also have two KIA324P chips. Your help would be appreciated as I don't want to send it for recycling!...perhaps it's the Toshiba chip itself?...
The TA8248k chip is the audio amplifier IC. If that was bad you'd have no sound. I could be wrong but those KIA324P chips look to be op amps. If you have the same Toshiba chip I talk about on your board then that IC has failed or is starting to. The Toshiba chip controls the on/off function and the volume, it's very rare that they fail unlike the PT2256. You have the older version of the ACS45 with the small plastic sub woofer box it appears.
Yeah, I was guessing that. Have already ordered the replacement Toshiba chip on Ebay so will see if that sorts it. The board is very different to yours it seems, on mine there's a single bridge rectifier component (KBU608) where as it looks like you have a bank of individual diodes performing the rectification.
Thanks a lot!
hello again. Replaced the Toshiba TC9235P chip and it's made absolutely no difference - the volume control still works but I cannot turn the unit on and off by pressing the volume controls down together. Worth a shot anyway!
Sorry that didn't fix it for you. Altec must have used a different way of switching on that model.
No worries, as i said it was worth a go and didn't cost a lot. Also tried taking out the transistors and testing with a DMM on the diode setting. No obvious dry solder joints, blown caps or resistors. Still works, just have to plug/unplug when I want to use it.
I have atp3 bass is broken above volume in 50% .. can u help me
Hi! My acs45.1 problem is when i plug in somtimes turn on and sometimes no power. When it is on i cant turn it off, no response in the up down buttons. Is it that same chip i would replace? Thanks for your answer.
Sounds like the IC has gone bad to me. When they do turn on is the sound distorted? 45.1 has a different subwoofer so the IC's may not be the same.
Beach Tech
Yes the sound is distorted. But it has the same pt2256 chip.
mine got the same issues as yours at the begining, no on off respond from the volume control, nor volume up down respond. i replaced PT2256 with TC9235P, fixed.
brro is ki red kalar vala pin tut gay he vo mil jayegi
I have a similar problem with very low volume. It is a clean sound just very low volume. How would I find out which control chip on my Altec Lansing ADA745 CBoard is the volume control?
THX Craig
On top of the each IC is a number that you can google for the spec sheet. The sheet should explain what the IC does in detail.
i have lost sound in my left side stand up speaker . how to fix it ,a great system.gary49b
can you please give me to one good solution.. i have 2.1 altech woofer once upon a time my woofer faced thunder issue which means lighting Thunder..after that my woofer not working its make one noice drrrrrrrrrrrrrrrrrrrrrrrrrr....pls give me to one solution
My VS4121 has developed an intermittent break in the cable that connects the rt spkr to the sub. Can someone tell me how to open the bottom of the spkr unit to get at the cable connections; i dont see any screws or anything.
Pls can some one help.
Thanks in advance
+Ajmal Rahman Unfortunately you have one the later models that Altec glued the sub woofer box together.
+Beach Tech: I need to get inside of the right spkr on my VS4121.can you advise where i cud get a replacement cable or even just the 9-pin connector that goes on the end Tnx