Daewoo DPP-42A1LASB Service Manual page 46

Trouble Shooting
White input using Test Pattern of Service Mode. Check the screen conditions
and basic functions.
Caution 1 !!
When disconnecting / connecting connectors, you MUST turn "OFF" the AC
power and check the direction and position of the connectors before
working.
Caution 2 !!
Whenever you reassemble connectors connecting High Voltage Board and
POWER PCB (CN805, CN806), remaining voltage still exists in the POWER
PCB could cause electric shock and damage the set.
reassemble the connectors several minutes after AC power is off. To be
more careful, using a Multimeter you should check to see if Vs is less than
10V and then connect connectors.
Definition
Red LED – Stand by state (ready for operating)
Green LED – The set is turned on and operating
Shut Down – While green LED, power PCB does not make any operating sound
or noise (i.e. Power relay does not operate normally)
Weak Discharge – The screen looks like BLACK, but there are little discharged
cells on the screen
Abnormal Discharge – Shows unexpected discharged cells on the image
No Signal – OSD is working but no images are displaying
No Raster – Not even OSD is displaying
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Therefore always