David,

I am familiar with the procedure you mentioned and did a search of the
archives and the FAQ, as I mentioned. I would still like to know the
mapping of the addresses to be able to extract service parameters and do the
correction to the mute address. If I have to desolder one pin I might as
well pull it and read/archive the data from the EEPROM. I am getting a
pretty good collection of EEPROM data that has proved useful for testing.
The question of what parameters are where in the hex addresses is still an
open one. Occasionally I get a dead set that I can still extract data from
the EEPROM and the tuning parameters would be nice to pull. Most dead ones,
of course, are impossible to get any data from.

BTW, I think disabling the mute circuit in hardware is a half-assed patch.
I had one come in with a bad speaker like this as well, and discovered after
I replaced the speaker that the resistor had been pulled. These speakers go
out without the transients all the time. Why take the chance when the right
fix is so easy and cheap?

Leonard

wrote in message
oups.com...
Google this group for the procedure to turn the speakers back on, easy
to do.

I have replaced several blown speakers, especially in the 175 series,
where someone prior tech bypassed the mute circuit and the constant pop
blew it out. I would recommend against the hack approach.

David

Leonard Caillouet wrote:
Has anyone mapped the addresses in RCA TV EEPROMS to the service
parameters?
In particular, I wonder where the audio mute problem is coming from.
I do
not have a chipper check but use a generic programmer and would like
to be
able to salvage service parameters on some EEPROMS and salvage chips
with
the audio mute problem.

I don't keep a selection of the chips in stock anymore and would like
to be
able to turn the sets around faster with less inventory and parts
ordering.

Searched the archives, likely repair groups, and the FAQ and did not
find
anything on the actual addresses of the parameters.

Leonard