On Jun 26, 5:57*pm, "William R. Walsh"
m wrote:
I'm about to give up...

I received a Teac AG-790 stereo receiver with burn damage to the PCB
underneath resistors 7R41, 7R47, 7R?? (unmarked, next to 7R47) and 7R48. I
repaired all of this damage, cleaned up the carbon that had been left behind
and soldered to the nearest remaining good portion of the board.

Up to this point, the receiver did what it has done since I got it. It
played through the right channel only.

I kept on looking and found a capacitor at location 7C27 (220uF, 16V) that
had blown out the rubber plug at the bottom. So I replaced that. Now nothing
works. I know the new cap to be good. The unit will power up just as it
always has, there are no blown fuses and my repair job seems to be
bulletproof (and correct, per the schematic in the service manual). The
audio is gone, replaced only by a faint humming on speakers and headphones
alike, in the right channel. Turning the volume dial does not change this..
There is still nothing from the left channel. The unit is not in protection
and nothing is getting hot, burning up or worse.

In addition, the display on the front of the unit will now indicate "E0" (or
maybe it's an O...no way to tell). This is not mentioned in the service
manual, nor did I find anything in a web search. Operations from the front
panel remain possible.

I'm beginning to think that it may be too far gone to fix. Anyone out there
with an eleventh hour idea?

William

'blown plug' usually means the acid is out and quite possibly eating
away the traces near by. Replacing the cap may have finished off a
nearly gone trace. Do you have the prints so you can 'ohm it out' and
verify the connections are actually there?

G²