Hi there, I have this (transistor?) with the code 827 and 1530A on it, and have had no luck finding a datasheet for it. I have measured about 0.56V from the centre leg (positive lead) to each of the 2 outer legs , and then approximately 1V from 'K' to 'A' , 0.7V 'K' to the other leg, and open circuit from the other leg to 'A' and 'K' (so I guess it's a busted NPN?) Anyone got a good idea how to find out what it should be? It's from a sony TV power board which is dead and is marked as IC6250. The 'A' and 'K' were marked on the board ...Thanks!

 

Hi there, I have this (transistor?) with the code 827 and 1530A on it, and have had no luck finding a datasheet for it. I have measured about 0.56V from the centre leg (positive lead) to each of the 2 outer legs , and then approximately 1V from 'K' to 'A' , 0.7V 'K' to the other leg, and open circuit from the other leg to 'A' and 'K' (so I guess it's a busted NPN?) Anyone got a good idea how to find out what it should be? It's from a sony TV power board which is dead and is marked as IC6250. The 'A' and 'K' were marked on the board ...Thanks!

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The brand mark looks like Arizona Microchip of PIC fame.

There may be a PIC version with only 3 pins, other possibility could be a 1 wire serial device such as a serial number ROM or various other types of memory.

Trying to test it as a transistor may have wrecked it.............

 

Would be better searching for the tv model number service manual, then you can see what it is. AK would imply a Thyristor...

 

I am guessing that it is a reference diode or shunt regulator. I have not found any parts with that number, though.

 

Thankyou all for the reply, I couldn"t find the right manual but found one for a similar sony TV, same component code, image attached! In this service manual the power supply is considered a non serviceable part so the individual components aren't listed, not helpful at all..

 

Looks like a Tl431 zener.

 

Looks like a Tl431 zener.



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I wouldn't just take it on faith with a Japanese product - but it probably is.

Couldn't hurt to study the 431 data sheet and see if the ratings make any sense for that application.

House coded 431s turn up in all sorts of places, but a mistake could be costly - so a bit of checking is worth the effort.

The 431 compares to 2.5V reference - if the Japanese part is different; the voltage sensing resistors will need to be changed. Apparently there are similar parts with 1.25V reference. If you put a 431 in it's place, it'll try to double the HT rail!

 

Hello,

In an other SONY schematic I found a partnumber at the chip:



I looked up the differences between the TL431 and this MM1530.
The TL431 has a reference voltage of 2.5 Volts and can be used upto 36 Volts.
The MM1530 has a reference voltage of 1.26 Volts and can be used upto 12 Volts.

Bertus