I have a set top box for freeview which has apparently died. Essentially no power. All fuses are OK (plug and internal fuse). So the next thing I did was to inspect the components for physical sign of failure. All capacitors look fine with absolutely no sign of swelling. The only thing I could see was some discolouration to the circuit board where three pins from a chip share a common connection to the transformer (bottom 3 of the four pin in the picture).
That discolouration suggests to me it is caused by heat.
The chip is marked
Q0370R
AVA08
I have found that the Q0370R is a Fairchild chip. Other than the apparent heat discolouration around the PCB pin holes there is no other visible sign of any issues.
So my question is could the chip have failed? - is it likely ?
Picture to help! View media item 56316
That discolouration suggests to me it is caused by heat.
The chip is marked
Q0370R
AVA08
I have found that the Q0370R is a Fairchild chip. Other than the apparent heat discolouration around the PCB pin holes there is no other visible sign of any issues.
So my question is could the chip have failed? - is it likely ?
Picture to help! View media item 56316