Sharp Aquos LC-42BX5H, Service Manual

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LC-42BX5H/M/X
6 – 1
LC-42BX5H
Service Manual
CHAPTER 6.
TROUBLESHOOTING TABLE
[1] TROUBLESHOOTING TABLE
No power (front LED failure to light up) or no startup (front LED failure to turn from red to green)
Is the AC cord connector tightly connected to the set?
NO Reconnect the AC cord tightly and turn on the power again.
YES
Is the output voltage at pin (5) of P5011 (BU+5V line) as speci-
fied? NO Replace the power unit (RDENCA195WJQZ).
YES
Are the wire harnesses and other cables properly connected in
the set? NO Reconnect the wire harnesses and other cables properly in the
set.
YES
Is there the PS ON and PNL_POW signal input at pin (1) and (4)
of P5011 (PS ON line)? NO Check the PS ON signal line PNL_POW signal line.
YES
Is the output voltage of each pin on P5010 as prescribed?
Pin 1 6V
Pins 3 and 4 5V
Pins 7 and 8 10V
Pins 11 and 12 13V NO Replace the power unit (RDENCA195WJQZ).
YES
Are the DC/DC converter outputs and the output voltages along
the control lines as specified? NO Check the DC/DC converters and the control lines. Replace
defective parts as required.
1) 5V (IC701, Q705 etc.)
2) 4V (IC703, Q707 etc.)
3) 3.3V (IC702, Q706 etc.)
4) 1.5V (IC704, Q708 etc.)
5) 8.5V (IC705 etc.)
6) 31V (IC706 etc.)