XG-MB70X (serv.man13). Troubleshooting - Sharp Projector Service Manual (repair manual). Page 10

Are HV sync signals sent to 
pins (1) and (6) of IC4010?

Check IC4008 and peripheral 
circuits.

Are HV sync signals sent to 
pins (22) and (23) of IC3002?

IC4008 and IC4010 are 
defective.

Are sync signals sent to pins 
(28) and (29) of IC3002?

Is a clock of 27MHz sent to pin 
(42) of IC3002?

Check X3001 and 
peripheral circuits.

Do signals of pins (21) and (22) 
of IC3002 change?

The I2C bus line does not 
function normally.
Check IC2201, IC2003, 
IC2005, IC2006, IC2007 
and their peripheral 
circuits.
Check if IC connected to 
I2CBUS functions 
normally.

Check IC3002 and peripheral 
circuits.

Are sync signals sent to pins 
(65) and (64) of IC3005?

IC3005 and peripheral circuits 
are 

defective.

Is the timing of vertical and 
horizontal sync signals 
correct?

Sync signal is normal.

Is the signal generator (input 
source) correct?

IC2003 and peripheral circuits 
are 

defective.

Set the signal source correctly.