Don't Miss

Cockroach Eggs Caused This Ultrasonic Car Stereo To Become Dead

By on July 24, 2020
car stereo repair








MAKE AND MODEL: Ultrasonic USB Car Stereo model No.US-CD,-8848BT


how to fix car stereo system

TROUBLESHOOTING AND RECTIFICATION DONE: Set was opened for cleaning and I was taken aback to see a lot and lot of cockroach eggs in almost every place apart from cob webs, which held carcass of a cockroach and other dirt collections! Looks like the set was a cockroach haven! After dismantling the CD unit, and removing the PCB, I cleaned the board as well as the cabinet very well. Also cleaned the Board with IPA. Removed the front panel and there also I found a lot of eggs. Cleaned that too very well.

Did a dry solder patch up on spots where the soldering was bad. Checked ESRs of caps at random and found these to be ok. After making sure there were no visible damages to the power supply section or other parts applied a 12V DC to the pins and found the set to be working. The USB was not working. The 5V DC and the clock pulse were present. The tracks were traced to the μController and found ok. So, the problem was due to either an internal problem of the IC or corrupted software. I hunted for an upgrade or reload of software, in the web as well as with my techie friends, with futile results. Hence told the party that they cannot use the USB. Lubricated the connectors with switch cleaning oil and assembled the set back. Cleaned the eye of the CD Unit with cotton and the reachable inner parts with brush. Ran a couple of CDs and found it to be working. Allowed one CD to run through to check that there were no problems with the sliding motor. Tuned Radio in all the bands and found these also to be working very well. Mission accomplished though only a partial satisfaction got jumped into the bag!


how to repair car stereo

how to repair and fix car stereo

how to repair and fix car stereo system

This article was prepared for you by Parasuraman Subramanian from India. He is 70 years old and has more than 30 years’ experience in handling antique equipment like Valve Radio, Amps, Reel Tape Recorders and currently studying latest tech-classes conducted by Kerala State Electronics Technicians’ Association. He has done graduation in BBA degree, private diploma in Radio Engineering and retired as MD of a USA company. Presently working as Consultant to Hospital and other institutions.

Please give a support by clicking on the social buttons below. Your feedback on the post is welcome. Please leave it in the comments.

P.S-If you enjoyed reading this, click here to subscribe to my blog (free subscription). That way, you’ll never miss a post. You can also forward this website link to your friends and colleagues-thanks!

You may check on his previous repair article below:




  1. Albert van Bemmelen

    July 24, 2020 at 9:07 pm

    Looks like those Cockroaches have no natural enemies who hunt them down sadly. A dirty job that got cleaned and fixed in a professional manner!

    • Parasuraman S

      July 24, 2020 at 9:35 pm

      Yes, in a sense we, technicians are scavengers! We are forced to do cleaning job in almost every device we set our hands on! But it is thrilling to do it!

  2. Lynn Blakely

    July 24, 2020 at 10:20 pm

    I have a tv repairman friend, that when he could smell the Cockroaches in a job, he would put the unit inside a trash bag, and spray inside the bag with bug killer, then let it remain closed to kill all the cockroaches. We live in Arkansas in the USA, where we constantly have to spray our homes with some kind of poison to kill the varmints. Fortunately the unit you repaired in this case the roaches were all dead. Repairing the USB would have been expensive, due to time, and lack of support from the manufacturer, sounds like you tried. Good job Parasuraman S

    • Parasuraman S

      July 25, 2020 at 6:07 am

      Many thanks for your comments and feed back!

  3. Humberto

    July 25, 2020 at 12:33 am

    I suppose this Stereo could have been out of use for a long. Cockroaches were living freely inside till you arrived and killed all of them Hahaha.

    • Parasuraman S

      July 26, 2020 at 10:28 am

      Ha Ha! Probably yes! Many thanks for your comments!

  4. Waleed Rishmawi

    July 27, 2020 at 7:27 pm

    wow man, that is a lot of disgusting stuff you are working with yet again, the repair is done. gloves and sanitizers now are required in out repair job. have a blessed day my friend.

  5. Saqib Sami

    July 27, 2020 at 10:19 pm

    Good job Sir. Can we use 100% iso propyl alchol for cleaning pcb's? is it safe t use ?

  6. Yogesh Panchal

    July 31, 2020 at 11:04 pm

    Happy Home for Cockroaches! most of time air went design of cabinet is major cause for this type of insects problem.

    • Parasuraman S

      August 1, 2020 at 12:19 pm

      Yes, it is true! Neglecting a device and keeping it unused for a long time, can also cause such pest infections.

  7. Raj

    August 5, 2020 at 10:06 pm

    Great job.. thanks for sharing

    • Parasuraman S

      August 6, 2020 at 12:16 pm

      Many thanks!


Leave a Reply

Your email address will not be published. Required fields are marked *

This site uses Akismet to reduce spam. Learn how your comment data is processed.