|
Title: Repairing the burnt FS-R6B Post by: santhosh-r on May 03, 2014, 01:56:05 PM I had a burnt FS-CT6B rx , which was damaged by reverse polarity during interfacing to my arduino.
I was sure that the voltage regulator must have blown.I started taking apart my Rx and investigated. Title: Re: Repairing the burnt FS-R6B Post by: santhosh-r on May 03, 2014, 01:58:31 PM When measuring the input and output voltages of the LDO it was 4.99V and 1.22V ,of which the output should be 3.3V .
Clearly the LDO is damaged. The part no. is CA33 and found the datasheet Title: Re: Repairing the burnt FS-R6B Post by: santhosh-r on May 03, 2014, 02:01:28 PM I had spare 3.3V and 5V LDO at hand ,they were AMS1117-3.3 and AMS1117-5 .
But to my disappointment , the CA33 was SOT-89 and AMS1117-3.3 was SOT-223 also the pinout was different. I made a simple breakout board for the AMS1117-3.3 to test. Hooked up the breakout board to the Rx with the burnt chip in place. And it did work as expected. Title: Re: Repairing the burnt FS-R6B Post by: santhosh-r on May 03, 2014, 02:04:30 PM Now I need a idea to remove the CA33 and place AMS1117 at its place,
The difficult job was to desolder an SMD part. I just cut the pins of the CA33 using a nipper and started prying out the chip while heating with the soldering iron. But the solder pads were damaged. So made a direct wire connection for the Vin from the input capacitor Title: Re: Repairing the burnt FS-R6B Post by: santhosh-r on May 03, 2014, 02:08:03 PM Again test the board whether it works ??? .yes it works ;D.
Now arrest the mechanical motion of the chip by using hot glue. Put all the components together and again test. The chip has the silicon die , the small square part in the plastic case. The Rx was repaired with a :Rs: 15 replacement and saved :Rs: 600 for a new Rx. Also a lesson learnt - experience :thumbsup: Title: Re: Repairing the burnt FS-R6B Post by: Akhilesh Chavanke on May 03, 2014, 03:37:47 PM :help:Can I get ur mobile num I have 2 rx which r been damage with the help of ur guidence if it gets repair ivlvery thankful to you :help:
My mobile num is 9595634361 Akhilesh Chavanke Title: Re: Repairing the burnt FS-R6B Post by: aditya on May 03, 2014, 04:07:19 PM Nice work Santosh Bhai..
Title: Re: Repairing the burnt FS-R6B Post by: aditya on May 03, 2014, 04:13:40 PM I am happy to see that u restore these faulty microelectronics in working condition again.. :thumbsup:
Myself is still struggling.. :headscratch: http://www.rcindia.org/radios-and-receivers/help-computerized-radio/msg74136/#msg74136 (http://www.rcindia.org/radios-and-receivers/help-computerized-radio/msg74136/#msg74136) Title: Re: Repairing the burnt FS-R6B Post by: santhosh-r on May 03, 2014, 06:28:35 PM Thanks aditya and akhilesh :)
Title: Re: Repairing the burnt FS-R6B Post by: vishu14 on April 24, 2015, 08:18:13 PM Hey i also burnt up the receiver today.However i burnt the tantalum capacitor at the beginning.I am not able to see the part name as its burnt.Can u tell me what it is?Its the first big yellow one.Right next to the male headers
Thanks |