Hitachi P50H401 Service Manual page 59

TROUBLESHOOTING FLOW CHARTS
PDP panel self-diagnosis function
This function is for a PDP module failure with no picture.
To use this Self-Diagnosis function, follow the next steps:
Procedure:
1) When the PDP module has some trouble, it generates blue blinking series of the power indicator light.
2) The next table shows the PDP PWB in which failure most probably would be allocated according to the number of blinks.
Number of blinks
of power indication light
1
2
3
4
5
6
7
8
[Blinking condition of power indication light]
Ex. 2 blinks
1 sec
Presumed failing PWB
of PDP panel
Logic
X-SUS
Y-SUS, SDR
X-SUS, Y-SUS, SDR, PSU
ABUS, ADM, PSU
ADM
(COF)
ADM
(COF)
All of above-mentioned
PWB's
1 sec 2 sec OFF
58
SDR: Scan Driver Module U & D
First Check PSU: Pwr Supply Unit For Cracks and SDR for pin holes
ABUS: Address Bus Module
ADM: Address Driver Module
NOTE: ADM is the same as (COF). The driver is mounted on the
Flexable Ribbon Connectors from the Address PWBs (A-BUS).
They are permanetly affixed to the panel glass.
Repeat
DW3U
Same as (COF)
CH 2