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« on: May 03, 2014, 01:56:05 PM »
santhosh-r
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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.

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Repairing the burnt FS-R6B
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« Reply #1 on: May 03, 2014, 01:58:31 PM »
santhosh-r
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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

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Re: Repairing the burnt FS-R6B
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« Reply #2 on: May 03, 2014, 02:01:28 PM »
santhosh-r
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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.

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Re: Repairing the burnt FS-R6B
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« Reply #3 on: May 03, 2014, 02:04:30 PM »
santhosh-r
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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

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Re: Repairing the burnt FS-R6B
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« Reply #4 on: May 03, 2014, 02:08:03 PM »
santhosh-r
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Again test the board whether it works Huh? .yes it works  Grin.

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  Indian Rupees 15 replacement and saved  Indian Rupees 600 for a new Rx.
Also a lesson learnt - experience  Thumbs Up

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Re: Repairing the burnt FS-R6B
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« Reply #5 on: May 03, 2014, 03:37:47 PM »
Akhilesh Chavanke
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FLY IN HEAVEN ¤¤¤



 :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 Me                                                 
My mobile num is 9595634361

Akhilesh Chavanke                     
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« Reply #6 on: May 03, 2014, 04:07:19 PM »
aditya
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Nice work Santosh Bhai..
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« Reply #7 on: May 03, 2014, 04:13:40 PM »
aditya
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I am happy to see that u restore these faulty microelectronics in working condition again..  Thumbs Up
Myself is still struggling..  Head Scratching

http://www.rcindia.org/radios-and-receivers/help-computerized-radio/msg74136/#msg74136
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« Reply #8 on: May 03, 2014, 06:28:35 PM »
santhosh-r
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Thanks aditya and akhilesh Smiley
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« Reply #9 on: April 24, 2015, 08:18:13 PM »
vishu14
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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
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