Help with rockford 1001bd

[stoke]

hi, i get this amp with some burned transistor and i replaced .know the amp turn on with no current excess but there is no audio. both opams are receiving -10 and +10 on their power supply pins(8-4),and there's 96volts on HV+ AND -11VOLTS ON HV-

 

[Perry Babin]

What's the DC voltage across the speaker terminals?

Which transistors did you replace?

 

[stoke]

there's no voltage across speakers terminal

ifr3205..

 

[Perry Babin]

What's the DC voltage on pin 6 of U21?

 

[stoke]

i replaced the op-amp u21, and now the amp power up and i can hear audio when i touh the rca pin, but after the protection light go off the amp makes a big noise on the speaker like a tone.

 

[stoke]

fixed after replace U1 and U21

 

[stoke]

i got the same problem after some min playing music

i got
u21 pin
1=-8
2=0
3=-8
4=-9
5=4
6= 7
7=-8
8=9

u1,u2 and u3 pin
4=-12
8=13

now make a noise on the spk when i power up and no audio

 

[Perry Babin]

What are you using for a signal source?

 

[stoke]

nothing i just touch the rca pin with my fingers to check if it produce any noise

 

[Perry Babin]

What sort of noise?

 

[stoke]

is like the noise the amp produce when you plug any rca cable

 

[Perry Babin]

Have you tried connecting a head unit to the amp to see if it produces clean audio?

 

[stoke]

yes i used mi laptop and it dosent make any sound

 

[stoke]

i found the a ground leg broken on the rca connector, and i get with neg on chasis
+HV 40 and -HV -35

 

[Perry Babin]

Post the DC voltage on all 8 pins of U5, U8 and U17. Copy and paste the following into the reply.

U5
Pin 1:
Pin 2:
Pin 3:
Pin 4:
Pin 5:
Pin 6:
Pin 7:
Pin 8:


U8
Pin 1:
Pin 2:
Pin 3:
Pin 4:
Pin 5:
Pin 6:
Pin 7:
Pin 8:


U17
Pin 1:
Pin 2:
Pin 3:
Pin 4:
Pin 5:
Pin 6:
Pin 7:
Pin 8:

 

[stoke]

U5
Pin 1: 0
Pin 2: 0
Pin 3: 0
Pin 4: -9
Pin 5: 0
Pin 6: 0
Pin 7: 9
Pin 8: 0


U8
Pin 1: 0
Pin 2: 0
Pin 3: 0
Pin 4: -9
Pin 5: 0
Pin 6:0
Pin 7: 9
Pin 8: 0


U17
Pin 1: 0
Pin 2: 0
Pin 3: 0
Pin 4: -9
Pin 5: 0
Pin 6: 0
Pin 7: 9
Pin 8:0

i detect a small current drawing and were hot when i was taking the measurement

 

[stoke]

i detect a small current drawing and one of the lm337 and lm317 were hot when i was taking the measurement

 

[Perry Babin]

Does the inductor near the speaker terminals have a broken winding?