Initializing Between Mpeg And Sdram; Initializing Between Mpeg And Flash - LG GoldStar DVD5185 Service Manual

3. Initializing between MPEG and SDRAM

1) MPEG IC start oscilating(13.5Mhz)after being
installed VCC
2) MPEG IC and RF IC get the /M - RESET signal
from front U - com(IC701) and they are initial-
ized.
3) And then, MPEG IC generate MCLK and send
to SDRAM
IC701
IC202
Front
RF IC
U-com
/M-RESET
IC501
R548
MPEG
(ZIVA5.0)
MCLK
X501

4. Initializing between MPEG and Flash

1) MPEG IC start oscilating(13.5Mhz) after being
installed VCC
2) MPEG IC is initialized by /M - RESE T
3) MPEG IC send the R/W(read/write) signal
before communicating with FLASH ROM
IC701
Front
U-com
/M-RESET
IC501
R/W
MPEG
(ZIVA5.0)
data
address
X501
(13.5Mhz)
/M-RESET X501
IC503
X501
SDRAM
(13.5 Mhz)
MCLK
(135 Mhz)
VCC
VCC
/M-RESET
IC504
Flash
ROM
R/W
3-3
4) MPEG IC and SDRAM are synchronized by
MCLK, they communicate between.
If oscilation(13.5Mhz) don't appear, check
The X-TAL and VCC and replace MPEG IC.
If MCLK don't appear, first cut the MCLK line
(remove R548) and recheck.
Don't appear -> check MPEG IC or replace
Appear -> check the SDRAM or replace
Power Reset Time
Cord in
R/W signal should be confirmed by Flash or the
next step will not continue.
As that result, the initial step(power cord in ->
green LED -> red LED -> standby) will fail.
If R/W signal doesn't appear, check the VCC and
replace the Flash ROM...
Power
Cord in