Digital Part Troubleshooting - Samsung PS51E450A1W Service Manual

4. Troubleshooting

4.1.4. Digital Part Troubleshooting

1) It is difficult to check digital video signal because of too fast and small signal.
2) Check digital video signal, Use H-sync, V-sync and Clock for basic.
3) Each digital video ICs connected with data line, H-sync, V-sync and Clock line.
4) Check H-sync period, V-sync period, Clock period.
5) If period is out of spec, Change the IC.
1 Period(15.63kHz )
Is th e S MP S CN801 conne ctor a nd the
Main Boa rd CN201 conne cte d?
Is th e Fus e (F8 01S ) of the S MP S P owe r
Input P a rt blown?
S MP S CN801
P IN2 : S TB 5V
PIN1_P S ON : Che ck to s e e if it is 0V
Re place the Main Boa rd.
4-10
1 P e riod(50Hz)
Ye s
Ye s
Ye s
No
Is th e S MP S CN801 conne ctor a nd the
Main Boa rd CN201 conne cte d?
No
Re place Fus e (F801S ).
No
Re place the S MP S .
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1 P e riod(13.5MHz)