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When power up the BIII today, all LED including trident not lit, seems something wrong with the power supply. I immediately switch off the PSU, disconnect the SSLV and measure the voltage, its normal at 5.25V. Connect it back to BIII and measure it, it drops to 3.xxV but slowly go back to 5.25. the LED on trident go on again. But the Mute and Lock BIII still not lit. I am afraid it will further damage the BIII if I continue power the BIII. Could anyone advise what should I do to trouble shoot the problem? Can I ship it back to TPA for repair?
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Which power supply are you using ?
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Originally Posted by: avr300  Which power supply are you using ? It is Salas Shunt regulation and it works perfectly.
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You could try to measure the current draw from the BIII with an amp. meter. Since the SSLV is a shunt there's a possibility that you're not shunting enough current. I hear you says the SSLV is working 100% - what if it not ? Try loading your SSLV with 10 ohms resistor instrad og the BIII - and see if it holds the 5.25v. Make it a 5w resistor - or do it speedy. Edited by user Sunday, August 19, 2012 7:39:44 AM(UTC)
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Originally Posted by: avr300 You could try to measure the current draw from the BIII with an amp. meter.
Since the SSLV is a shunt there's a possibility that you're not shunting enough current. I hear you says the SSLV is working 100% - what if it not ?
Try loading your SSLV with 10 ohms resistor instrad og the BIII - and see if it holds the 5.25v. Make it a 5w resistor - or do it speedy. I measured the output of the tridents and found both DVCC and VDD are 0.6xx and 0.9xxV. I then removed all the tridents from BIII and measured their output, all OK. Measured the resistance between output and GND on BIII and found DVCC output pin shorted to GND, only 1.1ohm. Quite sure that the BIII already dead. Can anyone HELP !!!
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Quote:
"Quite sure that the BIII already dead"
If you're that confident why don't you just buy a new. Quote:
" Can anyone HELP !!! "
Yes, I'm actually trying in case you hasn't noticed. --- Remove the firmware chip and try to power / measure again.
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Originally Posted by: avr300 Quote:
"Quite sure that the BIII already dead"
If you're that confident why don't you just buy a new. Quote:
" Can anyone HELP !!! "
Yes, I'm actually trying in case you hasn't noticed. --- Remove the firmware chip and try to power / measure again. Instead of buy a new one, can I buy chips to replace? or TPA can repair it with a lower price?
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Have you tried removing the Atmel chip ?
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Originally Posted by: avr300 Have you tried removing the Atmel chip ? You mean the on-board controller? already removed as I use Arduino for control.
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Yes that's what I meant.
If you have tested the board with no other connections than the power supply, and with the Tridents removed, then I afraid that the ESS chip is dead.
If you can handle SMD you can try removing the ESS from the board. Then you will know for sure.
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How much current is B3 drawing? Are you absolutely certain your shunt reg is supplying enough current? Have you tried a regular linear supply instead of a shunt? A bench supply can be really helpful here. Edited by user Sunday, August 19, 2012 12:22:05 PM(UTC)
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Originally Posted by: Russ White How much current is B3 drawing? Are you absolutely certain your shunt reg is supplying enough current?
Have you tried a regular linear supply instead of a shunt? A bench supply can be really helpful here. BEfore I removed all the trident from the BIII, I connected the BIII to a bench supply and at 5.25V, the current is around 760mA, but DVCC still lower than 1V. I then removed all the trident from BIII and measured the output voltage of them and all are OK. Then I measure the resistance between DVCC and GND on BIII and confirmed they are shorted - only 1.1 ohm.
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The tridents and AVCC module should all draw a constant current unless they are damaged. And it is definitely not 760ma total. :)
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Originally Posted by: Russ White The tridents and AVCC module should all draw a constant current unless they are damaged. And it is definitely not 760ma total. :) Could you advise what is the resistance between DVCC and GND? It shouldn't be 1.1 ohm
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It should be pretty high ~2K or so with the power off - but what I am trying to say is that you need to be sure the regs are ok too.
You need to be very careful about probe polarity when measuring resistance.
If you have the polarity correct and you are getting close to a short then very likely you have a killed ES9018.
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Did you try fully disconnecting your I2C Arduino control? It could be the cause, and should be eliminated as a possibility.
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Very true, you should remove everything. Then check each piece in isolation.
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Originally Posted by: Russ White Very true, you should remove everything. Then check each piece in isolation. I have everything disconnected and still get the 1.1 ohm. I took the ES9018 off by hot gun and confirmed it dead.
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