22
6. TROUBLE SHOOTING
( ):PWB name
Symptom Reason Check Points
The power cannot be turned on.
・ +5VL is not outputted.
・ The voltage between CN85-20pin and
GND is not 5V.
・T600,IC51,D606~D609 (MAIN)
・ Main CPU is not work.
・ Front panel is not correctly connected with
Main CPU.
・ IC105,IC90(HDMI)
・ CN82(HDMI)
・ BN82(FRONT)
Standby LED blinks slowly.
・ F602 has been disconnected.
(When F602 has been disconnected, the
serious stumbling block might be
generated. )
・ Main Transformer
・ D201,C636,C637(MAIN)
・ F603 has been disconnected.
(F603 cuts when the protection of Main
CPU doesn't work. )
・ F603,Q610,CN66(MAIN)
・ CN31,BN85(USB/CNT)
・ Each Transistor of Power amplifier.(MAIN)
Turns on and then off the STANDBY.
Standby LED flickering slowly.
・ The temperature of the heat sink is
abnormally high.
・ The voltage-controlled circuit is defective.
・ The temperature detection circuit is
defective.
・ P_AMP_FAIL(CN85-10pin) is 0V.
・ RL20,Q200,Q201,CN23(REG)
・ CN69,TH60,Q615(MAIN)
・ The DC voltage of several V or more has
been generated in the output of the power
amplifier.
・ P_AMP_FAIL(CN85-10pin) is 0V.
・ The voltage between each 1pin and GND
of CN70~76(MAIN) is confirmed.
・ Each Tr. Of Power amplifier (MAIN)
・ ET60,CN68(MAIN)
・ CN51(INPUT)
Turns on and then Standby LED flickering
faster.
・ The power supply circuit breaks down and
a more abnormal voltage has been
detected short. (+12V/-12V/+55V/-55V)
・ P_LINE_FAIL(CN85-12pin) is 0V. s
・ IC24,IC25,D201~D205(REG)
・ C636,C637(MAIN)
・ Q513,Q514(INPUT)
・ An abnormal current flows to any power
transistor due to the breakdown of the
power amplifier.
・ P_CURR_FAIL(CN85-16pin) is 0V.
・ The voltage between each 1pin and 2pin
of CN70~76(MAIN) is confirmed.
・ Q706,708,713,715,
703,705,719,721,
709,710,716,718,
711,712(MAIN)
All segment of FL Display is turrn on.
・ +5VD Supply is fail.
・ +5V is not supplied to FL display.
・ F
201,D208,IC21,BN22(REG)
・ CN81,CN82(HDMI PWB)
・ BN82,FL10(FRONT)
"CHECK E2P IF"on the FL DISPLAY
・ EEP-ROM cannot be normally rewritten. ・ IC86,IC115(HDMI)
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