Samsung cea455 series Service Manual page 20

ATT 3.ABNORMAL H,V SYNC
I
Check H-SYNC.
I
Check the Signal Cable connection
I
(but Vert. SYNC is normal)
Does pin 5 of 1C402 has a With the H-HOLD control,does
sawtooth wave?
the horizontal SYNC frequency vary?
YES NO YES NO
Check
Check Check
Check
1C401,IC402 1C401,1C402 IC102,C401
IC401,IC402
VR405 Q401
VR405
NO
Check MODE Detector
circuit
Check V-SYNC(but H-SYNC is normal)
Vertical adjustment is not possible at all
Check IC1 02,IC401 ,IC301 ,IC402,SW301
and related circuit.
-19-
Check the Signal Cable connection
(But Hori. SYNC is normal)
The V -SYNC frequency can be varied
y
slightl
Chec
IC301
k VR306,C301 ,C302,IC102,IC401,
,IC402