Trouble Shooting - HP f1703 Service Manual

8.2 Trouble Shooting

8.2.1 Main Board
1.NO SCREEN APPEAR
Measured CN6,pin3/4 ->5 V
Power key on/off monitor,LED function ok?
(Blue <-> off )
Yes
Connected the Signal cable again,
Led Blue
Check the LCD Connector and CN3
LCD connection OK
Check Panel-Power Circuit
OK,Panel Power OK
Check U1/U5/U6 Data-output
data OK
Replace Power board and Check
Inverter control relative circuit
Re-do White balance adjust
OK
Note: 1. if Replace "MAIN-BOARD" , need to check the DDC data & "WHITE-Balance".
2. if Replace " INVERTER(power board)" need to do " WHITE-Balance" again
,pin6/7 ->3.3 V
,pin9 ->1.8 V
Yes, all DC level exist
No
Led Orange
Check LED board
OK
Measured RGB (R18/R21/R23) H,V Input at U3 pin
OK,input
Measured U1/U5/U6 Data-output
Block
Check communication pin between U1 &
MCU pin14/15. , is it ok ?
MCU wave form OK
Replace U1(3000SX)
OK
Check inverter/DC-DC power board
Connected the Signal cable again,
Check LED board
Led ok
No,
Replace U8(MCU)
& check Reset pin 10
must be change from High
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HP f1703 Service Manual
Led no function
Replace MCU/chk
NG
Check Correspondent
component short/open
( Protection Diode )
NG, no Waveform