Bad ballast on Infocus IN72 - diyAudio
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Old 8th January 2013, 09:19 AM   #1
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Join Date: Mar 2010
Default Bad ballast on Infocus IN72

Hi,

I'm having a few issues with a bad ballast (#510-2111-00) on an Infocus IN72. It blows the 2A fuse and has a number of bad components that need replacing. Would anyone have the schematics for this ballast or know the values for the following components?

Q652 - Looks like a 2SK2647 so just want to confirm.
Q653 - Looks like a 2SC2120 so just want to confirm.
C657 - Seems to be a 47nF capacitor but not sure of the voltage.
D655 - Not sure what value this SMD diode is.
C656 - Not sure what value this SMD capacitor is.

Other parts I've replaced so far are:

R663 - 1ohm (+-5%) resistor. Used a 2W.
C653 - 470pF, 2kv capacitor
D652 - RLZ36B SMD Zener Diode

Also noticed this board looks same for all IN7x models and also the X1A, X2 and X3 so maybe the schematics for these are similar?

Many thanks in advance.

Last edited by axlp; 8th January 2013 at 03:11 PM.
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Old 14th January 2013, 08:36 AM   #2
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Join Date: Mar 2010
Quick update for future reference. Managed to repair the ballast replacing following:

Q652 - 2SK2647
Q653 - 2SC2120
C657 - 47nF capacitor
D655 - Used a salvaged SMD diode
C656 - 110pf SMD Capacitor
R663 - 1ohm (+-5%) resistor, 2W.
C653 - 470pF, 2kv capacitor
D652 - RLZ36B SMD Zener Diode.

Looks like C653 was the culprit as it shorted and took out bunch of other stuff.

Also replaced C512 (100nf, 450v) just in case and soldering in a fuse holder with a 2A fast blow fuse.
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