XOCECO PS42K8, Service Manual

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17
2
．
There is sound but no picture:
yes no
no yes
normal
Normal abnormal
abnormal
Normal abnormal
NOTE:
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 damaged
N601damaged
Check N501and the circuit
of output part