Sky PDS4250, Service Manual, Page: 34 / 62

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Main PCB Trouble Diagnosis
8-2. POWER PCB Trouble Diagnosis
Although Z-SUS / Y-SUS / SCAN / DATA COF (refer to II. PARTS of MODULE) are checked,
but still the set does not operate, and then check if Trouble Symptoms of the following Power
PCB appear.
After unplugging Power Connectors of Z-SUS(P1) / Y-SUS(P5, P6) PCB and checking
remaining voltage, there still exist several tens of remaining voltage.
When output condition of Power Module is set to low-voltage, output voltage table lists 3~7 are
NOT normal. Or when set to high-voltage, output voltage table list 1~2 are NOT normal. (Refer
to 4-2)
When output condition of Power Module is set to low-voltage, output voltage table lists 3~7 are
normal. But when set to high-voltage, output voltage table list 1~2 are NOT normal. (Refer to
4-2)
After turn on the PDP set with Remote Controller, when output condition of Power Module is
set to high-voltage, the LED turn Green but the Power Shut Down happens after 2~3
seconds.
If high voltage (Vsus, Vadd) measured from Power PCB is different from that of optimum
adjusting voltage label, re-adjust the voltages referring to I. 6-2. POWER Adjustments