Repairing Portable Stereo Speakers - Page 1
Forum section: electronics / repair

author: Waqar
author_rank: Newbie
timestamp: September 07, 2014, 06:41:02 am
content: Hello!I'm trying to repair portable speakers, so the problem is there is an 16 pin IC which is scratched from the top by manufacturerCan someone one please guide me how to configure this out. I wanna replace this IC but how ? (I'm unable to read IC number).Product info: Unfortunately there is no much informationPortable Stereo Speakers,130 MW, albestech (written on pcb ), local brand.

author: David_AVD
author_rank: Super Contributor
timestamp: September 07, 2014, 06:44:53 am
content: How did you find that the IC is faulty?

author: Waqar
author_rank: Newbie
timestamp: September 07, 2014, 06:58:58 am
content: i took it to repairing shop there technician told me that

author: tautech
author_rank: Super Contributor
timestamp: September 07, 2014, 07:31:31 am
content: Without knowledge of the chip, I would Google for "16 pin DIP Stereo Amp IC".Explore results, download datasheets and compare the datasheet "Typical application" examples to the PCB you have.You may have to "reverse engineer" the PCB.You could well strike it lucky.

author: David_AVD
author_rank: Super Contributor
timestamp: September 07, 2014, 07:40:04 am
content: TEA2025

author: tautech
author_rank: Super Contributor
timestamp: September 07, 2014, 07:45:22 am
content: Quote from: David_AVD on September 07, 2014, 07:40:04 am

author: David_AVD
author_rank: Super Contributor
timestamp: September 07, 2014, 07:46:01 am
content: http://au.element14.com/stmicroelectronics/tea2025b/ic-audio-amp-4-7w-pdip-16/dp/2112566

author: Waqar
author_rank: Newbie
timestamp: September 07, 2014, 07:49:24 am
content: Quote from: tautech on September 07, 2014, 07:31:31 amThanks for your attention.I already Google it and i found only one IC on Google results that is MAX9722.Now the thing which is confusing me is that in the datasheet of MAX9722 those pins which it declare for output, one of them is grounded on the pcb which i have.so now i'm bit scared whether i should try this IC or not because it can ruin my rest of pcband how can i 'reverse engineer' btw.

author: Waqar
author_rank: Newbie
timestamp: September 07, 2014, 08:08:44 am
content: Quote from: David_AVD on September 07, 2014, 07:40:04 amOMG you are genius man!THANKS aloti think your guess is right because when i compared grounded pins and output pins. These were exactly same as the datasheet is showing.now i'm going to try this IC with confidenceNow i'm wondering how did you find that. Can you share your technique please?

author: tautech
author_rank: Super Contributor
timestamp: September 07, 2014, 08:20:40 am
content: Quote from: Waqar on September 07, 2014, 08:08:44 amSuper Contributoryou know....like Superman.

author: David_AVD
author_rank: Super Contributor
timestamp: September 07, 2014, 08:26:02 am
content: Went to Digikey product indexSelected Linear - Audio AmplifiersFiltered by 16 pin DIP packageFiltered for stereo chipsFiltered for ones that work on more than 5V (input DC went via switch then to IC, not via the 7805)Downloaded each data sheet one by one and looked for GND on 3,4,12,13 and V+ on 16.Only one possibility leftChecked where the input and output pins went to see if that made sense with PCBPosted hereYes, I have been servicing audio gear for about 35 years.

author: Waqar
author_rank: Newbie
timestamp: September 07, 2014, 08:47:36 am
content: Quote from: David_AVD on September 07, 2014, 08:26:02 amThats GreatThanks manand Yes tautech you are right. He is Superman (atleast for me)