93C76 => pad broken on board => for experts only :s

[yannick1800]

My problem just got worst...

The pad / lead where pin 7 must be solder on is broken :(

According to datasheet of 93C76, pin 7 = DU = don't use.

Can someone confirm this?
Or if you know where pin 7 is connected to, i'll put a wire.
I dont see any road starting at pin 7.

Sorry for my english, hope its is clear.

Yannick

Dash is from Renault Trafic 2011

[88diablo]

Looks very much like pin 5 to me looking at photo. UPA has pin 7 as CS though not DU.

[yannick1800]

Looks very much like pin 5 to me.

Hi Diablo, thanks for responsding.

According to this sheet, it is pin 7, but i could be wrong.

Why do you think it is pin 5?

Kr

Yannick

[88diablo]

Just by looking at your broken track that was all, nothing more. It looks like it was joined to the large green mass in the middle of the pins that is also joined to 5, you have the board though so may just be how it looks.

[yannick1800]

Just by looking at your broken track that was all, nothing more. It looks like it was joined to the large green mass in the middle of the pins that is also joined to 5, you have the board though so may just be how it looks.

So you think i can connect 5 and 7 with a wire?
Could that work?

[88diablo]

From UPA it says pin 7 is CS which I think is chip select which is to do with programming. Please look it up though as I'm only suggesting by looking at your photo and it looks to me like it came from the same track on board as pin 5.

[claudio35]

So you think i can connect 5 and 7 with a wire?
Could that work?

only one bridge between 5 and 7,with a wire

[markony79]

I am not shore the pin 7 conected to pin 5....not see good

but try to put your eeprom, and dont conect pin 7 att all, and put dash in car...see what hapends
some eeproms dont need to use all pin for programing

[88diablo]

I am not shore the pin 7 conected to pin 5....not see good

but try to put your eeprom, and dont conect pin 7 att all, and put dash in car...see what hapends
some eeproms dont need to use all pin for programing

I also thought this but as he stated it as DU don't use I thought he'd tried it already as not used. I only suggested to pin 5 as by looking at the photo it's the only place it could really go looking at the track.

[madzar]

solder 7 thin wires and solder DIL socket or programmind smd adapter put the eeprom or put new DIL eeprom,then try with pin 7 it will save you time.

[raf0468]

use some circuit board cleaning solvent on a cotton earbud and lightly clean the area well get rid of all the exess residue you will have a clearer view
.....then look under close magnifier you will see a broken track if it leads to any........

good luck..

[batandball]

Like its already been mentioned, put chip back on board connect dash in vehicle and see what happens :vroam:

[batandball]

Check this data sheet

[Mjolinor]

You can plainly see from the pictures that pin 7 doesn't go anywhere and never did, forget about it.

In order to be absolutely sure you need to clean it and look carefully at the solid copper in the middle of the chip, if it connected anywhere it could only be to that and you would be able to see bright copper where it has broken along the edge of that big copper bit.

[Mjolinor]

http://www.digital-kaos.co.uk/forums/members/33749-mjolinor/albums/pics/6287-pad.png

Inside the red area you can clearly see that there is solder resist between the track and the missing pad so no connection there.

Inside the black area there is a lump of crud exactly where the broken copper would be so that needs removing to be absolutely sure though my money is on it not being connected. If it had been connected then it probably would not have broken when you overheated the board and if it did break thre would be a bright copper line visible.

[Lidahus]

Pin 7 is Program Enable

From Datasheet (http://ww1.microchip.com/downloads/en/devicedoc/21132e.pdf) 93C76/86:

Program Enable (PE)
This pin allows the user to enable or disable the ability to write data to the memory array. If the PE pin is floated or tied to VCC, the device can be programmed. If the PE pin is tied to VSS, programming will be inhibited. There is an internal pull-up on this device that enables programming if this pin is left floating.

Best is connect Pin7 (PE) to Pin8 (Vcc) to allow continued programming.

If would like to fix pad against the recommendation as described by Mjolinor (http://www.digital-kaos.co.uk/forums/members/33749-mjolinor/) PE will be connected to Vss and programming will be inhibited.
(http://www.digital-kaos.co.uk/forums/members/33749-mjolinor/)

[yannick1800]

I am not shore the pin 7 conected to pin 5....not see good

but try to put your eeprom, and dont conect pin 7 att all, and put dash in car...see what hapends
some eeproms dont need to use all pin for programing

when i do that, nothing hapends...

[yannick1800]

only one bridge between 5 and 7,with a wire

Tryed that, didnt work :(

[batandball]

What happens when youjust put the chip on the board with out pad 7 :hmmmm2:

[paul_12345]

What happens when youjust put the chip on the board with out pad 7 :hmmmm2:

"There is an internal pull-up on this device that enables programming if this pin is left floating."

[Lidahus]

when i do that, nothing hapends...

Tryed that, didnt work :(
So you tried already both options Vcc and Vss, none of them worked. Sure that eep works at all? Good dump?

[yannick1800]

So you tried already both options Vcc and Vss, none of them worked. Sure that eep works at all? Good dump?

eeprom still can be read/written

my orig dump is in attach

[yannick1800]

forgot the attachment :)

[Mjolinor]

So from the data sheet as people say, connect it to + or let it float, makes no difference. The guy that designed the board lets it float, it can be tied high if you want. If it doesn't work with it tied high or floating then either its gone to meet it''s maker, it's contents are corrupt or something elsewhere in the ECU is wrong.