Troubleshooting - Samsung DP14LS Service Manual

6 Troubleshooting

6-1 General Troubleshooting
Notes: 1. If a picture does not appear, fully rotate the brightness and contrast controls clockwise and reinspect.
2. Check the following circuits.
• No raster appears: Power circuit, Horizontal output circuit, H/V control circuit, and H/V output circuit.
• High voltage develops but no raster appears: Video output circuits.
• High voltage does not develop: Horizontal output circuits.
6-1-1 No Picture
Check signal cable connection, H/V Sync input.
Check Timing mode (14": 30~55kHz, 15": 30~61kHz).
Check Cont, Bright key (all Max) and Screen VR (G2).
Check key components of secondary part. :
D406, D407, D408, D515, Q402, Q410, Q504, Rectifier
diodes (D608 ~ D612), IC101 (Vcc~GND)
Check key components of primary part. :
D601 ~ D607, FH601, IC601, TH602
Refer to 6-2-16 No Video.
Check SW601 (Power key)
Refer to 6-2-1 No Power.
Refer to 6-2-3 No Raster and 6-2-12 High Voltage Failure.
Refer to 6-2-17 Micom Failure.
Refer to 6-2-13 I
DP14L*/DP15L*
2
C Failure.
6-1