J
Jason D.
Guest
If you have this Samsung chassis based on this kind (between 1987 thru
2002) with larger square PCB of 3 copper heatsinks or one steel
heatsink on smaller break-away CRT board.
Okay, If you have a set that seems to fire up fine but no pix,
crashing while trying to using for exammple rebooting like shutting
off and back on while trying to use volume or any weird things.
Check that EEPROM *first* is the solution. Saves you chasing "ghost"
from endless time like I had.
This type of chassis is found in 19", 20", 25" and 27".
Found this out hard way after trying: Micro IC, multi-regulator SIP IC
(this is one with reset output), MTS IC. Finally fixed it when I
replaced that eeprom. I did record all the settings before yanking
that eeprom and reused them on good eeprom.
The eeprom is NOT written or read while on (normal & using) or in
standby. Act of plugging in cause eeprom data be read into micro's
ram. When standby power is lost (unplugging, brownouts or blackouts),
micro goes into panic mode and writes ram contents to eeprom
milliseconds before remaining power is lost. When powering off after
finishing service mode setup, this also is written into eeprom. That
writing & reading eeprom info is undocumented in samsung schematic.
How I found this out when that set had a flawed eeprom.
BTW: resetting while in service mode do nothing to the eeprom, it
actually resets micro's few key items.
That's vastly unlike RCA with eeprom stuff, it's used all the time &
RCA's docs is very detailed in operation saved time.
Every one year I find at least 1 or 2 samsung sets with corrupted
eeprom.
Cheers,
Wizard
2002) with larger square PCB of 3 copper heatsinks or one steel
heatsink on smaller break-away CRT board.
Okay, If you have a set that seems to fire up fine but no pix,
crashing while trying to using for exammple rebooting like shutting
off and back on while trying to use volume or any weird things.
Check that EEPROM *first* is the solution. Saves you chasing "ghost"
from endless time like I had.
This type of chassis is found in 19", 20", 25" and 27".
Found this out hard way after trying: Micro IC, multi-regulator SIP IC
(this is one with reset output), MTS IC. Finally fixed it when I
replaced that eeprom. I did record all the settings before yanking
that eeprom and reused them on good eeprom.
The eeprom is NOT written or read while on (normal & using) or in
standby. Act of plugging in cause eeprom data be read into micro's
ram. When standby power is lost (unplugging, brownouts or blackouts),
micro goes into panic mode and writes ram contents to eeprom
milliseconds before remaining power is lost. When powering off after
finishing service mode setup, this also is written into eeprom. That
writing & reading eeprom info is undocumented in samsung schematic.
How I found this out when that set had a flawed eeprom.
BTW: resetting while in service mode do nothing to the eeprom, it
actually resets micro's few key items.
That's vastly unlike RCA with eeprom stuff, it's used all the time &
RCA's docs is very detailed in operation saved time.
Every one year I find at least 1 or 2 samsung sets with corrupted
eeprom.
Cheers,
Wizard