Envision EN9110 Service Manual page 19

I. No screen appear
Measured Input DC-voltage (J1)= 12 V?
Measured U901 SI-8050 pin4=5V?
Measured U904 AIC 1084 pin 2 = 3.3V?
Measured U903 AIC1117 pin 2= 3.3V?
Measured U902 RT9164 pin 2=2.5v
Measured U905 AIC 1084 pin2=2.5V
Disconnected the Signal cable (Loose the
Signal cable), Is the screen show "No
signal"?
No, nothing is show
Connected the Signal cable again,
Check LED status.
Led Green
Check the Wire-Harness from CN201
Was tight enough?
Check the Wire connection to panel side too
OK, Wire tight
Check Panel-Power Circuit Block
OK, Panel Power OK
Check U600 Data-output Block
OK, U600 data OK
Replace Inverter and Check
Inverter control relative circuit
Re-do White balance adjust
OK
Note: 1. If Replace "Main board", Please re-do"DDC-content"programmed & "White-balance".
2. If Replace " Inverter" only, Please re-do " White-Balance"
Yes, all DC level exist
Led Orange
Check Power switch is in Power-on
status, and check if Power switch had
been stuck?
OK, Keyboard no stuck
Measured RGB (r302, r304, r306) H, V Input at
signal input pin13, 15 was there signal?
OK, input
Measured Oscillator Block
Crystal X501
Check communication pin between U600 &
MCU pin
OK, Mcu have transition
Replace U600 (Gm5020)
OK
18
DC-Power Part
No
Check Correspondent component.
Is there any shortage or cold solder?
Yes, there have OSD show
Connected the Signal cable again,
Check LED status.
OK, clock
2,6,7. , Is it have transition?
Replace U502 (MCU)
& Check Reset pin 10
Must be change from High to
low when first AC power plug-
in
Led Green
Replace MCU
Led orange
NG
Check Correspondent
component short/open
(Protection Diode)
and Signal cable bad?
NG, no transition