Hifonics BRX 3016.1 D Brutus

[ADRIANd]

I Will inspect again there is a posibility something. else in the driver board has damaged, because at the beggining a protection diode of 250 volts going to pin 12 of the board was in short circuit.(i replaced with two 100v +150 volts) tha makes me think a high voltage come into the board trhu pin 12 tin 12 is the same pin where negative of 9v battery is conected,at this moment i desoldiered 1 pin of the diodes in series from the board just for testing

In cl1 y got 9.31 volts (down pin negative)

Yo are right Perry, i found a signal! Excuse me i expressed incorrect, i mean i do not find good drive signal.

 

[Perry Babin]

Which diode was shorted?

 

[ADRIANd]

E250a is voltage protection diode at side of driver board.
I do not see ID in the board, but i post photos

 

[Perry Babin]

Did you check the value of the highlighted resistor?

 

[ADRIANd]

I just checked and is out of range, measured 60 komhs in tester.
Must be 10 omhs (Brown black black) or 20 omhs (red black black)
I see brown
Thank you good observation

 

[Perry Babin]

I have it as 1 ohm. There is a silver band after the brown, black, black value bands which means divided by 100.

 

[ADRIANd]

You are right.

Is 5 band resistor
Now my doubt is: 1 ohm or 2 ohms, is more like red color to me, i do not know, what do you think?

If someone have this amp tha can help with meter redings of this resistor?

 

[Perry Babin]

Compare the first and last bands. The last is brown.

In photos I have of a 3016, I replaced the resistor with a 1 ohm.

In my experience, if the resistor is approximately 2 ohms, it's 2.2 ohms, not 2.0 ohms. 3.3, and 4.7 ohms are also commonly used.

 

[ADRIANd]

Thank you i Will use 1 ohm

 

[Perry Babin]

After replacing it, re-check the high-side drive.

 

[ADRIANd]

Perry thank you so much i have perfect drive signal in both sides

I Will install only one fet per side and post results

 

[ADRIANd]

i installed teh fets the signal i got is a bit Noisy.
i will stop the rapair work, until i got more fqa38n30 the two fets i was using for testing before i got high drive signal got damaged
the fets are easily damaged i did not feeled extreme hot just got warm, but got damaged
another fets i have tested (like 31b20) got hotter and do not got damaged

 

[Perry Babin]

If you installed a 10k resistor on the TL072, you have to remove it.

 

[ADRIANd]

I did not installed the 10k resistor (was not necessary) the drive signal apeared after the 1 ohm bad resistor was replaced, and applied 9volts between VS and VB.
The signals i show in post 132 are directly taken from speaker output