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Help needed

eoin95

Just wondering is the damage to the components in this picture a problem?
Should there be something connected to the middle pin of the transistor or can it work as it is in the second picture

Thanks

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Capt'n Midnight

If there is a crater in the plastic then it's exploded, and yes it does happen and yes it's very very dead. - Have a look for the missing piece if you can.

It looks like a TO220 package and usually the centre pin is connected to the heatsink - but it could be anything

That doesn't mean it's connected to ground or zero volts BTW

Without the missing numbers it's hard to confirm what it is ,
though looks like a voltage regulator , but without looking further it's hard to know if it's for 5V or for 5V more ( 7812 + zener =17V )
( or if the 5.1V is kind of an idiot diode )

at a guess , and it's a guess the circuit is just a 5V regulator and could be replaced with a 7805, but I cba looking the pinout to confirm or deny it.

eoin95

Capt'n Midnight wrote: »

If there is a crater in the plastic then it's exploded, and yes it does happen and yes it's very very dead. - Have a look for the missing piece if you can.

It looks like a TO220 package and usually the centre pin is connected to the heatsink - but it could be anything

That doesn't mean it's connected to ground or zero volts BTW

Without the missing numbers it's hard to confirm what it is ,
though looks like a voltage regulator , but without looking further it's hard to know if it's for 5V or for 5V more ( 7812 + zener =17V )
( or if the 5.1V is kind of an idiot diode )

at a guess , and it's a guess the circuit is just a 5V regulator and could be replaced with a 7805, but I cba looking the pinout to confirm or deny it.

Thanks for that. It's part of a battery control unit in a caravan, there is 13-14 v being fed into this part but nothing coming out. The control unit works fine except the recharge part and I'm guessing this is the reason.

Capt'n Midnight

what voltage is the battery ? - because if it's not 4.8V then could be messy, even if it is 4.8v it's messy because they prefer constant current rather than constant voltage.

can you contact the suppliers / check what part another similar caravan has

eoin95

Capt'n Midnight wrote: »

what voltage is the battery ? - because if it's not 4.8V then could be messy, even if it is 4.8v it's messy because they prefer constant current rather than constant voltage.

can you contact the suppliers / check what part another similar caravan has

Yea, sent an email to manufacture of the unit the other day. Not sure if I'll get a response. The little blue diode has 5v1 as per the pic but also on the other side 88C and BZY printed on it. Not sure it that adds light to it!!