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Wlan difficult problem?

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ykgbm

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anyone:
we have production wlan that use the atheros solution,we find some problem, when put shielding cover test power and EVM value is "zero",when take off shielding cover test power and EVM is Passed, can someone please help me explain it,thanks a lot!

(P.S: As these failure units, after have to replace PA(SST 12LP14) can be test pass,
i don't think these PA is bad component,)

Added after 1 hours 51 minutes:

as above narrate phenomena,

we have find very strange phenomena need share to anyone know,
when i use a metal stick that to be short PA surface(component top) to ground,
the test results is no any power and EVM output,
when I take off it,the test results is passed,
anyone can be explain it? Thanks!

ykgbm
 

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