Prima PH50D8, Service Manual

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There is sound but no picture:
yes no
no yes
normal
abnormal
Normal abnormal
Normal abnormal
Note:
For the originally self-powered software, if the operation of PW181 is abnormal, in SDA555X
there may be a state of individually switched-on. In this case very often the phenomenon of the
trouble is there is sound but no image.
Setting up for the self check of the screen:
For 42”SD screen (S42SD-YD04):Push down 2 and 4 and push up 3 of SW2001on the
logic board;
For 50”HD screen (S50HW-XD02):Push down 1 and 4 and push up 2, 3, 5, 6 of SW2001on
the logic board;
Please make sure resume it to the original status when the check is over.
With sound but no picture
If there is interface for switch on
Check if no image for all
other channels
N501 and
peripheral
Change into 4
check program
If oscilloscope is
ready,first
measure the
wave form of
signal X60
Pull X604,X709,short circuit pin 8 of X709 to
the ground,set logic board switch to self check
signal,see if the screen appears white when
switched on
Check input signal of
N601and power supply
Screen
N601
damaged
Check N501and the
circuit of output part