Service manual

Page 19 of 64
4-2-3 Dynamic single mode defective
Check supply of U1,and input, output
signal waveform, Osc. Frequency.
Check U5(VIDEO SWITCH)input,
output and power supply.
Check RGB mode
is normal?
Sub-picture is
normal?
Check DVI mode
is normal?
Check U20(SCALER) DC power
supply,X3 Osc. Frequency, and
output signal whether normal?
If abnormity, please replace
relevant parts.
single mode defective
(TV,VIDEO,S-Video or YCbCr)
Change to PIP mode, and change
the sub-picture to VIDEO mode.
Check supply of U6,U7 (MEMORY),
and input signal of U6
Check R120，R121，R117(provide
H,V,PCLK signal to panel), U30
(LVDS) DC power and output signal.
if abnormity, replace the relevant
parts.
Check the LVDS PIN whether have
short? If normal, then check the
LVDS cable and replace it.
Reference the “No video(panel)
NO
YES
NO
YES
NO
YES
OK
OK
OK
OK
OK