SK40C VDD Voltage drop

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SK40C VDD Voltage drop

Postby nik_kktm » Sat Jan 28, 2012 9:15 pm

hi,
i'v problem with my sk40c...as far as i check the voltage point is :
Vin=12v,
VDD=2V (Drop...normally it's ~5v)
Voltage at regulator = ~5v;
i tried test the board without PIC and crystal...the result is same...LED not bright as normal.

need help.... :cry:
Thanks
nik_kktm
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Re: SK40C VDD Voltage drop

Postby zhenning » Sat Jan 28, 2012 9:19 pm

nik_kktm WROTE:hi,
i'v problem with my sk40c...as far as i check the voltage point is :
Vin=12v,
VDD=2V (Drop...normally it's ~5v)
Voltage at regulator = ~5v;
i tried test the board without PIC and crystal...the result is same...LED not bright as normal.

need help.... :cry:
Thanks


there is a short circuit somewhere =)
zhenning
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Re: SK40C VDD Voltage drop

Postby ABSF » Sat Jan 28, 2012 10:36 pm

If the SMD 7805 is hot to touch, then something is shorted between Vdd and GND as zhenning said. Or else the 7805 might not be working properly.

Allen
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Re: SK40C VDD Voltage drop

Postby hyng » Mon Jan 30, 2012 10:30 am

nik_kktm, i guess you need to get the advice from Support by filling the form under the support tab.
http://www.cytron.com.my/support.php
The support team will get back to you ASAP.
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