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Many problems may cause the TV can't start up. Firstly，it's need to foreclose the
possible bad board（such as main board, key board, panel etc).We can do the right
thing only if we find the bad board. The main reasons such as: power supply
abnormal, core voltage, DDR's reference voltage, main program abnormal, MBOOT
program abnormal, wrong panel parameter, EEPROM data abnormal, bad Main IC
and DDR etc. The print information will be useful to analyzing the problems quickly
recur to the serial interface tools.
6.2 Abnormal display
Some
sources defeat
Check the relative
video signals
Check crystal's
frequency and
the range of
voltage
The method of maintain single source (such as TV, AV etc) abnormal display: Firstly,
Abnormal display
of
the
Check the Main IC'
periphery circuits.
Try
to
software.
reset. Change main
IC
28
All of the sources
defeat
Check panel
parameter; check
Check the signal circuit
between main IC and
LVDS socket (resistance,
inductance and via
holes); Check LVDS lines;
Measure the resistance
upgrade
between each pair of
NVM
LVDS signals, and check
it whether is 100/120Ω
panel
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