It is a 4 channel amp based on 2 IC-s, TDA8563Q.
I get no audio from 1st, 3rd, 4th channel. Audio is only in 2nd channel but it seems to be not amplified and sounds like its coming from a broken tweeter. I dont have an oscilloscope, cant analyze the sound. On 3rd channel I have dc voltage on 1 and 2 - nothing.
Found datasheet for TDA8563Q, legs 3 and 10 are supply and 5 is ground, between 3 and 5, 10 and 5 i have 11 volts on both ICs.
Legs 1 and 13 are inputs, 2 is signal ground, between 1 and 2, 13 and 2 i get 0.09 volts on both ICs when audio is fed to input.
There are some dual op amps on the board as well. 455800 JRC 7021B?, supply and ground are legs 4 and 8? I got 8.8 volts between 4 and 8 on both of these. Legs 1 and 7 are outputs. If I want to measure the output voltage then I measure voltage between leg 1/7 and ground? 2 and 3, 5 and 6 are inputs. Between 2 and 3, 5 and 6 i get voltage 0.09.
Is there a simple way to test opamps and ICs whether they are OK or not?
Right now i would just change ICs and see what happens, one of them is clearly blown if dc voltage is on output?
DC voltage on output is between blue and green wire, marked C on board (left side IC). Noisy low volume sound is coming from 2nd channel (right side IC)
I get no audio from 1st, 3rd, 4th channel. Audio is only in 2nd channel but it seems to be not amplified and sounds like its coming from a broken tweeter. I dont have an oscilloscope, cant analyze the sound. On 3rd channel I have dc voltage on 1 and 2 - nothing.
Found datasheet for TDA8563Q, legs 3 and 10 are supply and 5 is ground, between 3 and 5, 10 and 5 i have 11 volts on both ICs.
Legs 1 and 13 are inputs, 2 is signal ground, between 1 and 2, 13 and 2 i get 0.09 volts on both ICs when audio is fed to input.
There are some dual op amps on the board as well. 455800 JRC 7021B?, supply and ground are legs 4 and 8? I got 8.8 volts between 4 and 8 on both of these. Legs 1 and 7 are outputs. If I want to measure the output voltage then I measure voltage between leg 1/7 and ground? 2 and 3, 5 and 6 are inputs. Between 2 and 3, 5 and 6 i get voltage 0.09.
Is there a simple way to test opamps and ICs whether they are OK or not?
Right now i would just change ICs and see what happens, one of them is clearly blown if dc voltage is on output?
DC voltage on output is between blue and green wire, marked C on board (left side IC). Noisy low volume sound is coming from 2nd channel (right side IC)