I found a repair kit on eBay, while awaiting a reply from the seller to my query “ is ic4511 included?” I ask the technicians of badcaps to help me locate a distributor for the part, Gordon
Fuses good, plug in standby 5v good, power on power supplies good, display dimly lit, no response to menu button, looking at the mainboard, read johnboy1313’s post on the mainboard regulator IC4511, measured input pin 1 to ground shorted, now I seek a replacement IC4511. Printed on the case: a stylized capital M logo of Microchip Technology 751 and 563D in a 7 terminal smd case, I have a photo, Gordon
It may not be the IC Pin 1 shorted to ground but something connected on the output tracks.
This looks like the pinouts of the IC even though it could be wired differently on your circuit
The logo is in fact Mitsumi and not Microchip as I first thought.
This looks like the full part number MM1563 563D
The part appears to be obsolete but I am sure you could modify it and fit a 5V to 3.3V regulator in its place.
We agree, a shorted component on the 3.3v line from IC4511 pin 1. In previous decades I read manufacturer service bulletins and repair history notes, tracked the short lifting leads and cutting traces, typically I would find a shorted IC or rarely a shorted capacitor, anyone have a TNPHO716 schematic and notes on dimly lit display, no menu?
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