Panasonic TNPH0716 repair, anyone know what's wrong?

[videotronics]

Re: Panasonic TNPH0716 repair, anyone know what's wrong?

Can someone help me locate IC4511, Gordon

[tvtimmy]

Re: Panasonic TNPH0716 repair, anyone know what's wrong?

It's on the back of the mainboard. See pics.

[videotronics]

Re: Panasonic TNPH0716 repair, anyone know what's wrong?

Thank you

[videotronics]

Re: Panasonic TNPH0716 repair, anyone know what's wrong?

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

[dick_barton]

Re: Panasonic TNPH0716 repair, anyone know what's wrong?

The device appears to have the Microchip logo stamped on it but I can't find any information on it.

[videotronics]

Re: Panasonic TNPH0716 repair, anyone know what's wrong?

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

[R_J]

Re: Panasonic TNPH0716 repair, anyone know what's wrong?

I believe pin #1 is the output pin (3.3v), pin #7 is the input (5v)

[dick_barton]

Re: Panasonic TNPH0716 repair, anyone know what's wrong?

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.

[videotronics]

Re: Panasonic TNPH0716 repair, anyone know what's wrong?

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?