Belson BSV-2751, Service Manual

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2
1
between N501,N502 and N503, in addition to inspect the welding condition of relevant
parts and fittings. If the waveform detected is of regular square wave or no signal, it
shows that N501 or N502 or N503 is abnormal so that the address link and data link
between them become out of order. Now most probably N502 has error.
3.With sound but without picture
yes No
yes no
Note: The no picture phenomena in channel discussed here refers to that detected
TV,AV and terminal S are detected to be with sound but without picture. As to inspection
details of other channels, please refer to inspection program(4).
4.With picture but without sound
no yes
yes no
Sound yes but picture no
Is back lamp lit?
Try other channels see if all
without pictures.
N101 and
peripheral
Transferred to(4) inspection
Check back lamp board if
back light control by 32
nd
pin of CPU is in trouble
Picture yes but sound no
Check if sound process board
X211has output
Loudspeaker in trouble
Check if the 7
th
pin of power
amplifier has output
Check the peripheral
circuit of the poststepof
power amplifier
Check R255,R256 and see if there is
power amplification for signal input