21
3). White screen
4). Key Board
OSD is unstable or not working
Is Key Pad Board connecting normally?
Connect Key Pad
Is Button Switch normally?
Replace Button Switch
Y
Is Key Pad Board Normally?
Replace Key Pad Board
Check Main Board
N
N
Y
Y
N
White screen
Check Q405, Q406 and
CN402 solder
Check Correspondent
component.
Replace Panel
Check Correspondent
component.
Replace U401
OK
OK
Replace X401
OK
NG
NG
NG
NG
Check reset circuit of
U401 is normal
OK
X401 oscillate
waveform is normal
Measure Q405 base
is high level?
Summary of Contents for V22T
Page 18: ...18 ...
Page 22: ...22 6 PCB Layout 6 1 Main Board 715G3412 1 ...
Page 23: ...23 ...
Page 24: ...24 ...
Page 25: ...25 ...
Page 26: ...26 6 2 Power Board V22t 715G 901 1 15 ...
Page 27: ...27 ...
Page 28: ...28 ...
Page 29: ...29 V22t 715G3541P01000001S ...
Page 30: ...30 ...
Page 31: ...31 V24t 715G3258 1 ...
Page 32: ...32 ...
Page 33: ...33 ...
Page 34: ...34 6 3 Key Board 715G3421 1 6 4 IR Board 715G3413 1 ...
Page 36: ...36 8 Block Diagram 8 1 Main Function ...
Page 51: ...51 10 Exploded View V22t ...
Page 52: ...52 V24t ...