JVC LT-20A5, Service Manual

Page: 20 / 50

1-20 (No.YA350)
SECTION 5
TROUBLESHOOTING
End
No
End
End
Yes
Yes
Yes
Yes
Yes
Yes
No
No
No
No
Yes
No
No
Next
No picture appear
Does the LED
light up
LED light to
amber
The voltage of
L021, L022 is 12V
The voltage of
I007 1pin is 12V
The voltage of
I007 2pin is 5V
The voltage of
I016 27pin, 62pin
and 80pin is 5V
Is it entering into
power saving mode
Check I016 socket is
loosened
Replace
I007 & D002
Replace
L021 & L022
Replace F001
Replace I016
Restart PC signal
to ensure H. V. sync
are not absens
Reset the MCU(I016)
by pushing the power
key or replugging the
power cord
Picture
shows
Still no
picture
MCU(I016)
hangs
Replace I016
Yes
Yes
No
No
No
No
Next
Yes
Yes
No
Yes
No
Yes
End
Replace I025
Replace I009
Replace I028
Replace I001
Replace I004
Replace I019
Replace I037
The voltage of
I025 2pin is 3.3V
The voltage of
I009 2pin is 3.3V
The voltage of
I028 2pin is 2.5V
The voltage of
I001 2pin is 5V
The voltage of
I004 2pin is 1.8V
No
Yes
Replace I003
The voltage of
I003 2pin is 1.8V
The voltage of
I019 2pin is 3.3V
End
Yes Yes
Yes
Yes
No
No
No
The H. or V. sync
does not hold
Are the output of
I037(CLK, H, V, DE)
is normal
Are the input
waveforms of I037
is normal
Replace I037
Are flex cable
attached firmly
at P014
Are flex cable
attached firmly at
the LCD panel
connectors
Tighten flex cable
at P014
Tighten two flex
cables at P014
Replace LCD panel
End End
End