Sharp LC-42D85X - Chapter 6. Troubleshooting Table; Troubleshooting Table

LC-42/46/52D85X
6 – 1
LC-42/46/52D85X
Service Manual
CHAPTER 6. TROUBLESHOOTING TABLE
[1] TROUBLESHOOTING TABLE
No power or no startup.
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(8) of P9601(BU+5V)? NO Replace the power unit (RDENCA237WJQZ) and ac inlet unit
(RUNTKA341WJQZ).
YES
Are the wire harnesses and other cables properly connected in
the set?
NO Reconnect the wire harnesses and other cables properly set.
YES
Is there the PS-ON signal and PNL-POWsignal input at pin(4)
and (6)of P9601?
NO Check the PS ON signal line PNL POW signal line.
YES
Is the output voltage of each pin on P9601 as prescribed?
pin8 5V
pin11 and 12 15V
NO Replace the power unit (RDENCA237WJQZ) and ac inlet unit
(RUNTKA341WJQZ).
YES
Are the DC/DC converter outputs and the output voltages along
the control line? (SUB)
5V (IC402,Q402)
1.5V(IC403)
9V (IC404)
B3.3 (IC405)
5V (IC406)
NO Check the DC/DC converters and control line.
YES
Are the DC/DC converter outputs and the output voltages along
the control line? (MAIN)
3.3V (Q9607, IC9601, etc.)
1.8V(Q9609, IC9606, etc.)
1.3V(Q9610, IC9603, etc.)
5V(IC9602)
2.5V(IC9605)
1.2V(Q9606, IC9604, etc.)
BU3.3V(IC1805)
NO Check the DC/DC converters and control line.