Pic16C57C, Can almost boil water, is it dead - Page 1
Forum section: electronics / general

author: kolbep
author_rank: Frequent Contributor
timestamp: October 21, 2013, 08:20:21 pm
content: Hello Everybody.I am still working on repairing an OBY-600U Intelligent Luminaire.In the process of trying to figure out the twitching problem, something else happened.I noticed the LED screen was not working, as well as the fitting not doing anything else besides it's auto-homing sequence (which is controlled by each individual sections Pic uC.This leads me to believe that the main uC is not functioning.I have checked the PIC16C57C, and after the fitting being switched on for a bit, you can barely touch it.So I pulled the uC out of the fitting, breadboarded it just with 5v, GND, and tying the T0CKI high (and later low and later leaving it floating), the uC is pulling 300mA, and is up to 63.7degrees C, and still counting.Do you agree that the uC is toast?I have contacted several people who repair these fittings, but they only want to sell a complete controller board for R900.00.I do have access to another (working) fitting. If I pull the 16C57C from it, do you think I can read it with a Pickit2 (If it is not CP), and then what chip would I need to get to write it to (trying to keep pinout compatibility.But the other fitting is mounted on a roof beam, and to get to the controller, you have to dismantle the whole fitting,,, so maybe it is worthwhile just getting the new controller to save time and effort.Thanks for reading...

author: brainwash
author_rank: Frequent Contributor
timestamp: October 21, 2013, 09:07:54 pm
content: It's supposed to consume 2mA with no load attached to the outputs, what do you think? It's definitely toasted.

author: wraper
author_rank: Unknown
timestamp: October 22, 2013, 12:36:03 am
content: As much as I know PIC16C57 supports only parallel programming so PICKIT2 won't work. If you don't want to use OTP PIC16C57, PIC16F57 should work. And I really doubt that read protection is not enabled in the commercial device.

author: free_electron
author_rank: Super Contributor
timestamp: October 22, 2013, 03:17:01 am
content: Dead chips typically jump out of theor socket and go lay down in a far corner of the board, legs up...

author: walshms
author_rank: Regular Contributor
timestamp: October 22, 2013, 05:30:19 am
content: Quote from: free_electron on October 22, 2013, 03:17:01 amI've seen 'em attack... pop!A friend of mine was working on a board and when he leaned over to look at something and one of the ICs on the board (that was clearly toast) sent a piece of plastic into this forehead. After picking it out and stopping the bleeding, he swore he'd never work on an exposed board without safety glasses again...

author: FrankBuss
author_rank: Unknown
timestamp: October 22, 2013, 06:32:52 am
content: Speaking from my own experience, PICs get really hot, if Vss and Vdd are reversed.

author: dr_p
author_rank: Frequent Contributor
timestamp: October 22, 2013, 08:22:58 am
content: Quote from: FrankBuss on October 22, 2013, 06:32:52 amIt's a feature. You can thus use them to stress power supply rails. If the power supply is up to it, just reverse and use as normal.