Strong SRT8500 Service Manual page 10

4. In case that MAIN CPU operates normally but there is no VIDEO display.
In case of no OSD display.
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If OSD is not displayed, check first if VIDEO SIGNAL is detected from
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[R419(CVBS),R416(R),R417(G),R418(B)] of MAIN CPU.
And then, check any part with no DATA after checking VIDEO SIGNAL from VIDEO
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SIGNAL PORT of MAIN CPU, or SCART
In case of no MPEG display
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There can be a variety of reasons for the case
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Check first that CHANNEL of TP SIGNAL is locked properly.
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After this signal input to the resistor connected to MAIN CPU is done normally,
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A/V DATA comes out from MAIN CPU and flows into MPEG CHIP(MAIN CPU). If there is no
problem to here, it is thought that MAIN CPU and channel are operating without any
fault.
In case of no MPEG display to this point, inspect any disorder by checking
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U701(TUNER IC) and I/F of MAIN CPU.