Samsung HLRS078WX/XAA Service Manual page 45

Troubleshooting
6-3-2 When the lamp and the ballast are normal but the lamp does not turn on or turns off right after
quickly lighting up
1. Checkthe colorwheel
Checkif the colorwheel is running.+ Checkthe DMDboard and the ballastfor the signals.
Checkthe secondCN503pin for inputsignals.When3.5V,180Hzis output,the colorwheelis operatingnormally.
DGT3.3V DGT5V
FT750
CN750 ACN2012-900-2P_
R760
10Kohm
_" DDP CW_NDEX
IC75I
LM393D
L750
1 5uH
C755 C756
100nF 10uF
File _di Vetical Hodzlbcq !ri_ Disr,la_
3.5V 180Hz
11n_GFi417 04 _7
cu_sl Pos
C_2 Pes
/2 168ms
i_ , u-vl,
-_ DMDBoardCheckDiagram
CN752
53398-0590
7_ T
DGT5V
R775 _AA_
LAMPEN _
[_L_R778 _L R779 i
I<_1 t 0Kohm
i 10W I 3 3Kohn,
OB LAMPLITZ
R780 (LAMPENSCI)
LAMP_RX
C767
10nF
72
SamsungElectronics 6-9