I been working for the past 2 days on this amp, I found 2 op amp circled with red in my photo that does not have power supply. It is in the front of the drive circuit. All op amps are all supplied except on these 2. If I can make it working then I believed output will.come. Furthermore because of its thick brown coating tracing backwards is very hard, for the traces are not visible. I did not find any diffective diode or parts either in the power supply section. Does anybody encountered this issue or does somebody can share an schematics diag , I will appreciate it much.
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On the bottom right of the PCB it says "GLADEN - ONE"
A little bit further to the right it says "11 28"
Now when you go up from that point you'll find two big SMD BJT --> Check these and especially check the soldering as these BJT's tend to run hot and the soldering ages very quickly. Most of the time renewing the soldering should fix it.
The same goes for the two 1206 SMD power resistors to the left (2k7). Renew the soldering even if it measures OK. Good luck.
A little bit further to the right it says "11 28"
Now when you go up from that point you'll find two big SMD BJT --> Check these and especially check the soldering as these BJT's tend to run hot and the soldering ages very quickly. Most of the time renewing the soldering should fix it.
The same goes for the two 1206 SMD power resistors to the left (2k7). Renew the soldering even if it measures OK. Good luck.