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e) VGA channel has no picture
Check CS17, CS18, CS19,
CS20 have signal input.
Check NS01
circuit.
f) HDMI channel has no picture
Check NS01 peripheral
circuit, crystal oscillator
and the power supply.
Note: To get normal HDMI picture, especially when connect to DVD player with HDCP
information, it must be guaranteed that NV04 and NV05 (HDMI port DDC chip) writing
is correct, and especially bus between NV04, NV05 and HDMI jack must be smooth
and unhindered. Secondly HOTPLUG circuit must be guaranteed (it is of high level at
normal broadcast), otherwise the picture playback can not be normal.
Check NS01 pin 29,
pin 30 have
synchronous signal
input.
Yes
Yes
No
Check circuit
between VGA
socket and NS01.
Check NS01 has digital
signal input.
Yes
No
Check circuit
between VGA
socket and NS01.
No
Check circuit between
HDMI socket and
NS01.
18
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