Sharp lc-32rd8, Руководство по обслуживанию

Страница: 40 / 118

LC-32RD8E/S/RU-BK/GY (1st Edition)
4 – 1
LC32RD8E-BK
Service Manual
CHAPTER 4.
TROUBLESHOOTING TABLE
[1] TROUBLESHOOTING TABLE
No power supply (Front LED does not light up) and no power-up even if turned on (Front LED light up).
Is the wire harness in the unit properly connected?
NO
Reconnect and recheck the wire harness.
YES
Are F7101 and F7103 normal?
NO
Are L7101-2, L7110, C7104-5, VA7103, D7101, etc. faulty?
Check if the peripheral circuits are short-circuited.
YES
Is F7102 normal?
NO
Are T7101, D7104, TH7101, C7118, etc.faulty?
Check if the peripheral circuits are short-circuited.
YES
Is BU+5V supplied from pin(11) of connector CN7201
when the power switch is turned off?
NO
Check the peripheral circuits on the primary side of IC7101, T7101,
etc. and the secondary side of D7222, D7215, L7206, PC7104, etc.
YES
Is the PS_ON signal sent to pin(10) of connector CN7201
when turning on the power switch and does RL7101 nor-
mally work? NO
Check the peripheral circuits such as PS_ON circuits of Q7207,
PC7103, RL7101, etc.
YES
Is a DC voltage of approx. 400V applied to both ends of
C7129?
NO Does the PFC circuit normally work?
(Check IC7102, L7103, L7104, D7106, D7108, TH7102, Q7104-5,
Q7117, etc. and the peripheral circuits.)
YES
Is 13V supplied from pins(1-4) of connector CN7201 when
the power switch is turned on?
NO Check the primary side of T7102-3, Q7111-6, etc., the secondary side
of D7203, etc., the peripheral circuits and the protection circuits of
D7205, D7208, PC7102, etc.
YES
Is 60V supplied when the power switch is turned on?
NO
Check the secondary side of D7201, the protection circuits of D7206,
D7207, D7209, PC7102, etc. and the peripheral circuits.