Mitsubishi Electric PD-5010, Service Manual

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6
2. No picture displayed and picture errors
(Caution) IPXXXX is installed in the MAIN PWB and the VIDEO PWB. These components are inserted in the
power line. If there is any error occurring in the circuit, these components function to prevent the
evolution of this problem to other areas. Accordingly, check whether the same voltage is generated at
both ends of each component. (In normal state, the component is internally short-circuited.) If the
same voltage is not generated, this means that the MAIN PWB is out of order. The same check is
needed also for the DSP PWB.
(1) No picture display of the PC signal only or both the VIDEO and PC signals
Enter an input of XGA69H gray scale in the input
circuit of PC1, and select PC INPUT 1.
NO
To “No presentation of pictures and ON-screen
display” (P11)
YES
YES
Is a signal of 3Vp-p available at at the signal input The MAIN PWB of the AD connector is out
pins of IC8701 and IC8702? (Signale names: REV_ of order.
LVDS, RODD_LVDS, ets.)
NO
YES
Is a signal of 0.7Vp-p available at Pins 1, 3, 5 of The MAIN PWB is out of order.
the PC connector and a sync signal of 5Vp-p
available at Pins 7, 9, 10, 12?
NO
(1)-1 (P7)
Is ON-screen display available?
• • • • • •
H
V
1, 3, 5
7, 10
45kHz
9, 12
60Hz