Service Modes, Error Codes, and Fault Finding
EN 22 LGE PDP5.
5.3.1 No Display
1. Check whether the LED1 of the PSU is turned "on" or not.
2. Check the power and signal cables of the PSU.
3. Check the connection of the X board, Y board, and Z board
to the Control board.
4. Replace the PSU
5. Check the output voltages of the PSU (Vcc= 5V, Va= 65V,
Vs= 187V).
6. When 5V2 is not present, check whether the fuse is
shorted or opened in AUTO/NORMAL mode.
7. When the PSU is in protection mode, check waveform and
count of LED1 as shown in the figures below.
Figure 5-65 DC-port signal (1M02) protection
Figure 5-66 Vs output protection
Figure 5-67 Va output protection
Figure 5-68 5V output circuit protection
Figure 5-69 12V and V_tun circuit protection
Figure 5-70 +18V circuit protection
Figure 5-71 +8V6 circuit protection
Figure 5-72 -18V circuit protection
Figure 5-73 PFC circuit protection
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