Prima PH50D8, Руководство по обслуживанию

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a. If it’s one vertical unlit line, then COF has problem.
b. If it’s a vertical entirely unlit block, then first check if the connection socket between COF and
logic BUFFER has problem. If not, check if the connection socket between the logic BUFFER
and the logic board is normal. If yes, replace the logic BUFFER. Finally, if the problem still
remains when the replacement is over, then replace the logic board.
5. There appears on the screen a mono color signal and one or several vertical bright lines of other
colors:
a. If it’s a vertical bright line of other colors, then the problem lies with COF or the screen.
b. If it’s an entire vertical block of other colors, then first check to see if the connection socket
between COF and logice BUFFER has problem. If no problem, check if the connection
socket between the logic BUFFER and the logic board is normal. If it’s normal, then replace
the logic BUFFER. If the problem still remains after the replacement, then replace the logic
board. Finally if the problem is still there, then the problem lies with COF.
6. There appear on the screen abnormal bright spots or blocks that are different from what’s
described above:
a. Check if the connection socket between COF and logic BUFFER board has been well
plugged.
b. Replace the logic BUFFER board. If it’s not solved then replace logic board. If the problem
still remains, then it’s the problem with COF.