Sampo SME-27FDL5, Service Manual

Page: 23 / 95

TROUBLE SHOOTING FLOW CHART VER1.0
4-
3
3. OVER VOLTAGE
(1) 210V
(2) 6.3V
4. THE VOLTAGE OF HEATER LOWER THAN 5.8V
5. THE PICTURE FROM R.G.B. OUTPUT IS NOT CLEAR
Adjust VR731, Does the
Voltage of C757(+) can
adjust to 210V
﹖ ﹖ ﹖ ﹖
Adjust VR731
Voltage of C757(+)
to 210V
Check
IC712,
IC713
Is the Voltage of C765(+)
much higher than 6.3V
﹖
﹖ ﹖
﹖
YES NO
Is the voltage of C757(+) much higher than 210V
Is the voltage C757(+) much higher than 210V
Check Voltage
of C757(+)
Check +190V and the high voltage 31KV
±
±±
±
1KV of
C753(+), C912, C909
Is the Voltage C757(+)
much higher than 210V
Check Q731, IC712
grounding path
YES NO
YES NO
Adjust VR731 voltage of C757(+) to let 210V