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4. Troubleshooting
4-2. How to Check Fault Symptom
No Power and No Video
„
Power cord on.
Check 'Stand-By A19V_PW in HG32NE478
model or A13V_PW in / HG49NE47*
others'
A19V appear at BD214_DR/BD216_DR/
BD217_DR
A13V_PW appear at BD206_NDR/BD220_
NDR/BD207_NDR
0V to 13V (IC206 #4)
0V to 19V (IC205_DR #2 )
Set On.
Check 'SW_POWER_TO_SMPS' more
than 3.3V appear at R236 in HG32NE478/
HG49NE47* model ?
0V to 3.3V↑ (R236)
Check 'Power input of Main Ass'y' ?
DC B13V, B5V appear at Q202(B13V_PW)
in HG32NE478/HG49NE47* model ?
Q203(B5.0V) in HG32NE478/HG49NE47*
model ?
0V to 13V (Q202#5#6)
0 to 5.0V (Q203#5#6)
Check 'Power of IC203#1(B1.5V) ?
Check 'Power of LVDS (13V)' appear at
TP-PANEL_VCC?
0V to 13V (TP-PANEL_VCC)
Change the LVDS cable ?
4-4
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Cause : There did not supply the power from SMPS.
No
Measure : Change 10P power cable and SMPS.
Cause : Sub micom IC did not control the Function.
No
Measure : Change the Main Assy or change Function.
Cause : There is problem at DCDC/LDO.
No
Measure : Change the Main Assy.
Cause : There is problem at DCDC/LDO.
No
Measure : Change the Main Assy.
Cause : There is proble at FET(Q202_NFRC) or Main IC
(NT17L) did not control the SW_PVCC.
No
Measure : Change the Main Assy.
No
Change the Panel.
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