Electrical Troubleshooting Guide & Waveforms; System Clock X501 (13.5Mhz); Initializing Between Cpld And Flash - LG GoldStar DVD5185 Service Manual

ELECTRICAL TROUBLESHOOTING GUIDE & WAVEFORMS

1. System Clock X501 (13.5Mhz)

NORMAL
1) MPEG IC start oscilating
after being installed VCC
1.4 Vp-p
X501 : 13.5 Mhz

2. Initializing between CPLD and Flash

IC501
MPEG
AD0
(ZIVA5.0)
~ AD15
(address
& data)
AD0
LADD4
IC501
MPEG
(ZIVA5.0)
X501
(data)
IC504
IC502
FLASH
CPLD
LADD4
~ LADD19
(address)
ABNORMAL
1) Logo Picture doesn't appear
2) Initial step fail
* Initial step : power cord in -> green LED ->
red LED -> power key input -> Logo picture
X501 : there is distortion
IC502 separate address from data & address
and control the address sector of IC504.
If LADD4 ~ 19 don't appear on IC502,
Initial step will fail and NO Logo picture
on screen.
IC502 should be checked or be replaced...
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