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samsung y buffer ic's

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sidecutter_5:
hi leo,this trio of boards(upper,lower buffers and ysus) are legendary for causing problems if you only replace one of the chips it can cause an expensive chain of events.
all the chips have had the same amount of use so when is the next one going to let go?
when a chip shorts out it usually takes out the ysus fets as well so when you put your refurbished buffer in and fire it up it burns that board and your lower buffer as well.
check your ysus board fets for shorts first.
q5500
q5501
q5502
q5503
q5504
q5506
one of these is surface mount
i know it takes a long time for delivery of these fe chips be patient or it will bite you.
done two of these now one a phillips.
put fans in it if you are keeping it
regards ste

Tellyfix:
Multimeter on diode range, check pins 34 and 36 on each IC. If you get a short circuit or about 0.8 (depending on polarity of probes then you have a faulty IC (usually top 1 or 2)....

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