XOCECO LC-27FB18, Руководство по обслуживанию

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Troubleshooting guide
(1) abnormal picture
a) Failure with resistor rows R839~R844 of image processing board, which may lead to lack of
color or color splash.
b) Failure with resistor rows R825~R830 of image processing board, which may lead to lack of
color or color splash.
c) A certain differential wire pair of LVDS of XA50 or X803(RX0+/-, RX1+/-, RX2+/-, RX3+/-)is
abnormal, which may lead to lack of color or color splash.
d) Failure with resistor rows RA18~RA25, which may lead to loss of corresponding color from
the gray degree corresponding to the picture of channel HDMI.
e) Failure with NB07,NA51 and their peripheral circuit, which may lead to picture abnormal of
PC, YPrPb and YCrCb.
f) Failure with N104, which may lead to picture abnormal of TV, AV1, AV2, S-VIDEO.
g)
Failure with N803/N805/N806, which may lead to picture abnormal in all channels.
Begin
A red indicator
lights?
Check power board , button board and power
cord
A blue indicator
lights?
Check if the pin1 of X602 in data processing
board is high level(+5V)? check V660/V661.
No
No
Yes, turn the unit on
Display picture? No
Check if the crystal in data processing board
starts, DDR clock is correct?
Yes
Yes
If the picture of each channel
is normal?
No
Check the signal inputted from the channel to
pin IC or IC and its peripheral circuit or the
output of LVDS is normal
If the sound of each channel is
normal?
No
Check the signal inputted from the channel to
pin IC is normal or IC(R2S15900/TPA3001)
and its periphery is normal