Service manual

16
III. DOS MODE has jitter
NOTE :the rule of doing AUTO-CONFIGURATION : must be a full-size screen, if the screen not full , the auto-
configuration will fail. So in dos mode ,just set your “CLOCK” in OSD-MENU to zero or use some full screen edit
file (ex: PE2, HE) and press “AUTO”
IⅤ. THERE WAS SNOW PHENOMENA or BRIGHT NOISE ON THE SCREEN
When use pattern 32 Gray-scale / or 16 Gray scale, there is a snow phenomena on the screen (like a noise spread
inside) that means data missing, may be cause by FPC loose, or resistor array cold-solder
V. THE PANEL LUMINANCE WAS DOWN
Set Contrast & brightness =maximal, RGB= 50
Quit from OSD-screen, measured Y(luminance)
With chroma 7120, check Y= 250±10 CD/M2 ?
NG
If the Y less than 160 cd/m2 (after the Brightness &
contrast = max) then change the LAMP of panel
If Y can reach ＞230 cd/m2 that means
The lamp still working well, so we just re-do the
white-balance process
Please refer to page 7
OK
Check the FPC loose or tight or Replace a new FPC
Re solder all resistor array from LP1 – LP13
Replace Mainboard to new one