Power Pcb Trouble Diagnosis - Daewoo DT-4220NH Service Manual

Main PCB Trouble Diagnosis

8-2. POWER PCB Trouble Diagnosis

After checking High Voltage Board / Scan Relay Board / Data Relay Board (refer to II. PDP
MODULE), and the set still does not operate, then check if the following Power PCB's Trouble
Symptoms appear.
After unplugging Power Connectors of Power PCB (CN806 and CN805) and checking
remaining voltage, there still exist several tens of remaining voltage.
When output condition of Power PCB 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 4-3)
When output condition of Power PCB 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
4-3)
After turning 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"
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