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picture, No sound Fluorescent lamp failure to light up
Check all the settings microprocessor's adjust process menu.
No Remove F701 and
Is there short-circuiting?
Do F701 check the load side. F701. Does F703 function? Replace F703.
Yes No Are T701's secondary Is there short-circuiting of
outputs, +34V, +15V, +10V, T701 primary side periphery, S4101 and Is pin (34) of in Check the OFL1 line, IC1201 connection cable. the "H" state? and their peripheral parts. +5V -9V normal? Q701, Q703 and S4101.
No Yes No
Is T701's primary oscillator Check Q1774 and their Is the Q3603 short-circuiting? waveform normal? peripheral parts.
Yes
Check T701's secondary T1771 T1772 primary side Q1771~Q1773 and load. periphery, Q1771~Q1773. connection cable.
No Is there short-circuiting of Check T1771, T1772,
TROUBLE SHOOTING TABLE
17
Yes
Replace the fluorescent lamp with new one and check again.
LC-15M4E
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