Daewoo DQR-1000D, Service Manual

Page: 89 / 106

89
TROUBLESHOOTING
No Dipsplay in VFT
After boot.
Is Power for VFT and
I701 on?
F+(1,2) : -17~ -18V
F-(29,30) : -22~ -24V
VEE(P16, P17) : - 29V
VDD(P1, P44) : +5V
Check the
connection
PO W ER SA VIN G
Please remind th a t the VFD
display shows not h ing before
stand by ON when “Low Power
Standby ” is “ON ” in the setup
menu .
No display in the VFD
testing mode?
Does Grid and Segment
pin in the VFT shows
appropr iate wavef orm?
Yes
No
Yes
No
Yes
Do all Key work?
Does SOUT (P14) of
I701 change when
pressing a key?
No
Yes
Does SIN (Pi n13) of
I701 make an
waveform?
Yes
No
Replace the I702
It is a configuration
for Power Saving.
Yes
Replace the I701
No
Replace the I702
Replace VFT
Replace the I701
No
Yes
TESTING MODE
Press PR-, PREV and N EXT a t
the same time then all seg ment
li ghts are on.
Is case of No display in VFT