On 27 Aug 2005 13:26:33 -0700, "moonlite" wrote:

For all of you people familiar with this chassis: Set came in dead. I
knew immediately it was the tuner grounds problem so I did that. Now
set comes on just fine but without any audio. I can order a new eeprom,
but why have my customer wait if there are indications that it may not
be the eeprom ? For example, disconnecting emmiter of Q903 does not
help. Pin 29 of the micro is not high, so the mute circuit is not
activated. I replaced the audio output IC. All caps check ok. I tried
to see if the speakers are in the OFF position by disconnecting pin 8
of eeprom after set comes on, but i could not see this option in all
the menus ( I am familiar with this procedure). Does every CTC177
chassis have this option ? If so, how do I get to it ? I am afraid I
may have to wait for this $2 part after all. Thanks for your ideas.

moonlite

I've seen some really strange problems caused by corrupted EEPROMs. I
had one set that wouldn't come into horizontal sync no matter what I
adjusted the H freq to. Another set refused to change to the A/V
input, but was otherwise fine. A new EEPROM fixed both sets.

If you have any EEPROMs from similar RCAs in the junk pile, give one a
try. It will probably work well enough to tell you for sure if the
EEPROM is causing no sound.
Andy Cuffe

-- Use this address until 12/31/2005

-- Use this address after 12/31/2005