Daewoo DDC400 - Page 8

Power on without
sound/ with
abnormal sound
1>. Check if two poles of buzzer are cold solder
or broken, remove the abnormity;
2>. Check if buzzer is ok, remove the
abnormity;
3>. Check if R15, Q5, R8, R113 are cold solder,
insufficient solder or NG, remove the
abnormity.
The shift between
AC power and
battery is NG.
1>. Check if power connector is cold solder,
insufficient solder, short circuit or NG, remove
the abnormity;
2>. Check if D15 is broken, short circuit or
insufficient solder; remove the abnormity.
TFT-LCD image
unstable
Check if golden finger of CCD FPC and
connector contact well.
TFT-LCD white
image
1>. Check if LCD interface is inserted to the
bottom or the interface is cold solder, root of
LCD FPC is broken, remove the abnormity;
2>. Check if each group of power +5VD,
+8.5VL, 3.3VD, -8.0VL of LCD are normal.
TFT-LCD display
menu without image
1>. Check if switch of shutter is normal, remove
the abnormity;
2>. Check if CCD flex board assy well, remove
the abnormity;
3>. Check if output of CCD related components
is OK, remove the abnormity;
4>. Check if each group of voltage of CCD is
OK; remove the abnormity.
TFT-LCD color
aberration/ color
difference
1>. Check if CCD flex board is OK or assy OK,
remove the abnormity;
2>. Check if soldering of CCD is short-circuit,
insufficient solder or cold solder, remove the
abnormity;
3>. Check if capacitor C503, Q501 on CCD flex
board are OK, remove the abnormity;
4>. Check if U1 is cold solder, insufficient solder
or broken, remove the abnormity.
TFT-LCD no image
but TV displays
normally
1>. Check if TV connector is OK, remove the
abnormity;
2>. Check if VIDEO_DET is OK; remove the
abnormity.
Display
and image
system
TV no image but
LCD displays
normally
1>. Check if AV connector and related
components are OK, remove the abnormity;
2>. Check if VIDEO_DET is OK; remove the
abnormity.