Sharp AQUOS LC-42XD10E, Service Manual

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LC-42XD10E/RU
4 – 1
LC42XD10E
Service Manual
CHAPTER 4.
TROUBLESHOOTING TABLE
[1] TROBLESHOOTING TABLE
The unit is not powered on even if the power is turned on.
Are the power cable and harness in the unit properly connected? NO Reconnect the power cable and harness properly, and turn
on the power.
YES
Is F701 normal? NO Is the fuse still blown when turning on the power after replac-
ing F701?
YES
No
YES
Is approx. 5V applied to the BU5V output [between pins 20 (+) and
22 (-) of PA]? Is a voltage of 8V or more generated at C790?
YES
NO NO YES
Replace R790, D742,
IC702, R780, and R781. Replace R790, D742,
IC702, R780, and R781. Replace Q705, D715,
IC701, R726, and
R721.
Are approx. 13V, approx. 24V and approx. 35V generated at the
UR13V, S29V and UR35V outputs respectively? NO Check D708, Q727, Q726, R830, R829, D762, D763, Q741,
R824, R825, IC704, R826, R827, and R828.
YES
Is a click heard when the replay is turned on? NO Check Q706, Q741, D707, R729, and R776.
YES
Is approx. 12V generated at UR12V [between pins 1 (+) and 3 (-) of
PL]? NO Check Q731, Q742, Q732, D767, D766, R843, R844 and
C799.
YES
Is a voltage of approx. 380V generated at C726? NO Check Q705, D715, IC701, R726, and R721.
YES
Is approx. 60V generated at the INV60V output [between pins 1 (+)
and 3 (-) of LA]? NO Check Z1, Q707, Q708, Q716 and L706.
YES
Is approx. 10V generated at the INV10V output [between pins 5 (+)
and 3 (-) of LA]? NO Check IC705, R832, R833, R834, and C813.