23
7-1. Dynamic Focus
Focus is poor
Is the
waveform of the
DF pin in FBT
correct?
NEC : 300V 120V
SAMSUNG : 300V 120V
1. Check the CRT socket
or connector wire
2. Trouble in FBT or CRT
1. Check the waveform of
the pin 1 of FBT.
2. Check D614
* Check after adjusting the static focus
finely by VR in FBT
DF
waveform
F
VH
F
VH
F
VV
F
VV
No
Yes
Yes
Is the
waveform of
the pin 15 in IC501
correct?
Yes
No
1. Trouble in Q605, Q606,
Q607 and their ambient circuits.
2. Trouble in Q616, IC602
and their ambient circuits.
Trouble in IC501 or C513
No
DF
waveform
5V
2V
0V
0.8V
Is the
cathode voltage
of the D614
about 510V?
Summary of Contents for 710C
Page 1: ...ServiceManual XGA COLOR MONITOR Model 710C DAEWOO ELECTRONICS CO LTD OVERSEAS SERVICE DEPT...
Page 32: ...37...
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