Author Topic: Help!!- TC Flashback  (Read 3098 times)

miklax

Help!!- TC Flashback
« on: October 08, 2013, 05:21:50 PM »
Hi there friends,

I hope I can find anyone kind enough to help me.... :)

I've received a TC Flashback for repair.. but it has blown a few components beyond recognition...
Would anyone please share a few hi.res pictures of the both sides of the board?


Thanks in advance!

g_u_e_s_t

Re: Help!!- TC Flashback
« Reply #1 on: October 09, 2013, 02:12:45 AM »
if you post pictures of what you have, we might be able to guess what the parts were.

miklax

Re: Help!!- TC Flashback
« Reply #2 on: October 10, 2013, 10:45:36 PM »
Hey!!

I've managed to find this pic of a working pedal..
Unfortunately I cant read the inscription on the parts.. :S
I have little experience on identifying SMD components.. Anyone can identify these ones?



On the red square I can read R4 on it's top, It seems to be a diode...
The component on the green square, seems to be a resistor wich burnt..
Also... I'm a bit suspicious about the other component on the orange square.. I can read L4.... It has another character, but I cant identify it.. maybe a Shottky diode??

Cheers

g_u_e_s_t

Re: Help!!- TC Flashback
« Reply #3 on: October 11, 2013, 01:26:38 AM »
the red square is most likely a shottky diode.  1A/30V variety.  the green square might be a fuse of some sort, or just a resistor.  there is some small chance its an inductor.  the orange square is a transistor, diode, or voltage regulator.

are there any designators under the squares?

these look to be part of the powersupply section.  can you follow where the traces and see what connects to what?  i am guessing that the shottky and resistor/fuse/inductor thing are just protection on the input.  you might be able to find out more information about the orange square part from the datasheets for ic9/10.  those are the switching powersupply chips.

Ice-9

Re: Help!!- TC Flashback
« Reply #4 on: October 11, 2013, 05:58:14 AM »
the red square is most likely a shottky diode.  1A/30V variety.  the green square might be a fuse of some sort, or just a resistor.  there is some small chance its an inductor.  the orange square is a transistor, diode, or voltage regulator.

are there any designators under the squares?

these look to be part of the powersupply section.  can you follow where the traces and see what connects to what?  i am guessing that the shottky and resistor/fuse/inductor thing are just protection on the input.  you might be able to find out more information about the orange square part from the datasheets for ic9/10.  those are the switching powersupply chips.

What g-u-e-s-t said.

I can see the red square has D6 marked nest to it, protection diode.
green square is a resistor, try and read the numbers on it and that will tell you the value.
orange square could be a transistor , diode or voltage reg, that whole area of the pcb looks like PSU components and likely to be part of a 3.3v supply for the sdram chip and dsp chips.
www.stanleyfx.co.uk

It's fairly straight forward, if you want to start it , press start. You can work out the rest of the controls for yourself !

miklax

Re: Help!!- TC Flashback
« Reply #5 on: October 25, 2013, 12:59:27 AM »
Hi folks, I've managed to get a few detailed pics  using an improvesed microscope.. :D

The R4 part (maybe some kind of Diode?)
https://www.dropbox.com/s/n4igaqyqhp7mdxb/DSC_0507.jpg

L4t (shottky diode - BAT54):
https://www.dropbox.com/s/4xobsrfpwxqmrux/DSC_0514.jpg


The Switching regulator (ST1S03)

https://www.dropbox.com/s/01xsudecwlbba7l/DSC_0510.jpg

And finally the burnt resistor:

https://www.dropbox.com/s/pwgujhuftuzpfei/DSC_0521.jpg

Now that I've identified these components, maybe I can start the repair :)
Cheers!!
« Last Edit: October 25, 2013, 01:02:34 AM by miklax »