3-2
ELECTRICAL TROUBLESHOOTING GUIDE & WAVEFORMS
1. System Clock X501 (13.5Mhz)
IC501
X501
MPEG
(ZIVA5.0)
NORMAL
1) MPEG IC start oscilating
after being installed VCC
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
2. Initializing between CPLD and Flash
1.4 Vp-p
X501 : 13.5 Mhz
X501 : there is distortion
IC501
MPEG
(ZIVA5.0)
IC502
CPLD
IC504
FLASH
AD0
~ AD15
(address
& data)
LADD4
~ LADD19
(address)
(data)
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…
AD0
LADD4
