39
4. DISPLAY (Display Board)
Yes
Yes
Yes
Yes
Yes
Yes
Yes
FL TUBE doesn't light.
Does not appear when press the "DIMMER" on the
remote control.
May be DIMMER was working.
Also, May be "PURE DIRECT" was working.
CHeck VFD_RST(U2#9).
Is voltage more than 2.6V ?
To replace the parts to check there is nothing wrong
with the connection circuit VFD_RST. (Such as a cable
of Q19, Q17, XP4, XP4) Abnormal when there is no
substrate to replace the MAIN PCB.
Is VH(U2#6) set to the 29V~35V?
To replace the parts to check there is nothing wrong
with the circuit connection of VH. Such as cable, XP4
(ZD602, D609, Q16, Q13, Q14, +12 V, XP4
Check Between F-(U2#52) and F+(U2#1) .
Is voltage 3.78V~4.62V?
To replace the parts to check there is nothing wrong
with the connection circuit F +, of F-. Such as cable,
XP4 (U700, D610, D611, D612, +12 V, XP4
Check F-(U2#52).
Is voltage 2.0V~3.0V?
Chek VDD(U2#7).
Is voltage 3.0V~3.6V?
To replace the parts to check there is nothing wrong
with the connection circuit of VDD. (Such as a cable
of XP4, XP4)Abnormal when there is no substrate to
replace the MAIN PCB.
Check the output signal to VSTB(U2#10),
VCLK(U2#11), VDATA(U2#12).
Is voltage set to "H"(more than 2.6V)
(U2#10), VCLK (U2#11), to replace the parts to check
there is nothing wrong with the connection circuit (U2
# 12) VDATA VSTB. (Such as a cable of XP4, XP4)
Abnormal when there is no substrate to replace the
MAIN PCB.
VFD and (U2), abnormality of the peripheral circuits.
Check the location of the abnormality, and correct it.
No
No
No
No
No
No
No
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