# AAAPPPCCC U1 IC burning **URL:** \ **Category:** DIY STUFF\ **Created:** [October 2, 2020, 1:02pm UTC](https://lookmumnocomputer.discourse.group/t/aaapppccc-u1-ic-burning/1920 "2020-10-02T13:02:20Z")\ **Posts on this page:** 20\ **Page:** 1
**Author:** ![MoveQuick](https://avatars.discourse-cdn.com/v4/letter/m/a87d85/32.png) [@MoveQuick](https://lookmumnocomputer.discourse.group/u/MoveQuick)\ **Post date:** [October 2, 2020, 1:02pm UTC](https://lookmumnocomputer.discourse.group/t/aaapppccc-u1-ic-burning/1920/1 "2020-10-02T13:02:20Z")
Just finished my AAAPPPCCC and plugged it in and the first IC socket is burning up. The 3rd and 4th pins on the left side seem to be the ones to be burning. I’ve checked all the components to make sure they’re in the orientation of which they are. I’ve ordered a new IC socket to see if it’ll make a difference but I would appreciate some help to find out what the problem is. Thanks, Liam. ---
**Author:** ![willow2x](https://yyz2.discourse-cdn.com/free1/user_avatar/lookmumnocomputer.discourse.group/willow2x/32/5343_2.png) [@willow2x](https://lookmumnocomputer.discourse.group/u/willow2x)\ **Post date:** [October 2, 2020, 1:23pm UTC](https://lookmumnocomputer.discourse.group/t/aaapppccc-u1-ic-burning/1920/2 "2020-10-02T13:23:08Z")
Could you grab a couple photo’s of the whole board and the suspect IC? Would help with debugging =) Is there any chance some excess solder has flowed through and created a short? Is everything the right value? Not missed any solder points? Edit: Also, welcome to the forum =D just saw its your first post. ---
**Author:** ![MoveQuick](https://avatars.discourse-cdn.com/v4/letter/m/a87d85/32.png) [@MoveQuick](https://lookmumnocomputer.discourse.group/u/MoveQuick)\ **Post date:** [October 2, 2020, 1:40pm UTC](https://lookmumnocomputer.discourse.group/t/aaapppccc-u1-ic-burning/1920/3 "2020-10-02T13:40:50Z")
I’ve taken the IC socket out now but you can still see burn marks, I couldn’t see any solder points I missed or bridged solder points. Whilst taking the socket out it broke up as well so I can’t really get a picture of that. ![IMG_20201002_142921](https://global.discourse-cdn.com/free1/uploads/lookmumnocomputer/original/2X/6/673095c097bada0ab1c710a9dfb7143d39726795.jpeg) ---
**Author:** ![MoveQuick](https://avatars.discourse-cdn.com/v4/letter/m/a87d85/32.png) [@MoveQuick](https://lookmumnocomputer.discourse.group/u/MoveQuick)\ **Post date:** [October 2, 2020, 1:41pm UTC](https://lookmumnocomputer.discourse.group/t/aaapppccc-u1-ic-burning/1920/4 "2020-10-02T13:41:21Z")
![IMG_20201002_142904](https://global.discourse-cdn.com/free1/uploads/lookmumnocomputer/original/2X/7/705fb2395039a2fc6f50dcb0beb202773574496c.jpeg) ---
**Author:** ![MoveQuick](https://avatars.discourse-cdn.com/v4/letter/m/a87d85/32.png) [@MoveQuick](https://lookmumnocomputer.discourse.group/u/MoveQuick)\ **Post date:** [October 2, 2020, 1:42pm UTC](https://lookmumnocomputer.discourse.group/t/aaapppccc-u1-ic-burning/1920/5 "2020-10-02T13:42:33Z")
![IMG_20201002_142915](https://global.discourse-cdn.com/free1/uploads/lookmumnocomputer/original/2X/5/54d36355b05764f3066c1949c8d7a78888c1cb6a.jpeg) ---
**Author:** ![analogoutput](https://yyz2.discourse-cdn.com/free1/user_avatar/lookmumnocomputer.discourse.group/analogoutput/32/29663_2.png) [@analogoutput](https://lookmumnocomputer.discourse.group/u/analogoutput)\ **Post date:** [October 2, 2020, 2:03pm UTC](https://lookmumnocomputer.discourse.group/t/aaapppccc-u1-ic-burning/1920/6 "2020-10-02T14:03:10Z")
You say “socket” but the other ICs appear to have been soldered directly without sockets. Are you referring to a socket ![image](https://global.discourse-cdn.com/free1/uploads/lookmumnocomputer/original/2X/f/f61383f4a1b115c64a6279143cdb1b7b67d5e2b7.jpeg) or an IC? ![image](https://global.discourse-cdn.com/free1/uploads/lookmumnocomputer/original/2X/a/ac7f4eea264c141736c37000d15e2b57436e821c.jpeg) ---
**Author:** ![MoveQuick](https://avatars.discourse-cdn.com/v4/letter/m/a87d85/32.png) [@MoveQuick](https://lookmumnocomputer.discourse.group/u/MoveQuick)\ **Post date:** [October 2, 2020, 2:22pm UTC](https://lookmumnocomputer.discourse.group/t/aaapppccc-u1-ic-burning/1920/7 "2020-10-02T14:22:04Z")
The ic there wasn’t sockets on the parts list so I didn’t think they were needed. So does each ic need a socket? ---
**Author:** ![analogoutput](https://yyz2.discourse-cdn.com/free1/user_avatar/lookmumnocomputer.discourse.group/analogoutput/32/29663_2.png) [@analogoutput](https://lookmumnocomputer.discourse.group/u/analogoutput)\ **Post date:** [October 2, 2020, 2:36pm UTC](https://lookmumnocomputer.discourse.group/t/aaapppccc-u1-ic-burning/1920/8 "2020-10-02T14:36:01Z")
Sockets are optional, and you’ve just discovered why people like to use them! ---
**Author:** ![Jos](https://yyz2.discourse-cdn.com/free1/user_avatar/lookmumnocomputer.discourse.group/jos/32/151_2.png) [@Jos](https://lookmumnocomputer.discourse.group/u/Jos)\ **Post date:** [October 2, 2020, 3:35pm UTC](https://lookmumnocomputer.discourse.group/t/aaapppccc-u1-ic-burning/1920/9 "2020-10-02T15:35:34Z")
You need quite a bit of power to get a burn like that. What voltage did you apply to the circuit / how did you power it? ---
**Author:** ![d42kn355](https://yyz2.discourse-cdn.com/free1/user_avatar/lookmumnocomputer.discourse.group/d42kn355/32/273_2.png) [@d42kn355](https://lookmumnocomputer.discourse.group/u/d42kn355)\ **Post date:** [October 2, 2020, 3:36pm UTC](https://lookmumnocomputer.discourse.group/t/aaapppccc-u1-ic-burning/1920/10 "2020-10-02T15:36:53Z")
[oof](https://youtu.be/ciPpz6cw1c0) ---
**Author:** ![MoveQuick](https://avatars.discourse-cdn.com/v4/letter/m/a87d85/32.png) [@MoveQuick](https://lookmumnocomputer.discourse.group/u/MoveQuick)\ **Post date:** [October 2, 2020, 3:52pm UTC](https://lookmumnocomputer.discourse.group/t/aaapppccc-u1-ic-burning/1920/11 "2020-10-02T15:52:46Z")
I only put 12v I to it as it said 9-12v ---
**Author:** ![Jos](https://yyz2.discourse-cdn.com/free1/user_avatar/lookmumnocomputer.discourse.group/jos/32/151_2.png) [@Jos](https://lookmumnocomputer.discourse.group/u/Jos)\ **Post date:** [October 2, 2020, 3:53pm UTC](https://lookmumnocomputer.discourse.group/t/aaapppccc-u1-ic-burning/1920/12 "2020-10-02T15:53:25Z")
I take it this was 12 V DC / and are you sure it was not more ? ---
**Author:** ![MoveQuick](https://avatars.discourse-cdn.com/v4/letter/m/a87d85/32.png) [@MoveQuick](https://lookmumnocomputer.discourse.group/u/MoveQuick)\ **Post date:** [October 2, 2020, 4:07pm UTC](https://lookmumnocomputer.discourse.group/t/aaapppccc-u1-ic-burning/1920/13 "2020-10-02T16:07:40Z")
Yeah it was 100% 12v it’s the same one I use for my keyboard ---
**Author:** ![Dud](https://yyz2.discourse-cdn.com/free1/user_avatar/lookmumnocomputer.discourse.group/dud/32/610_2.png) [@Dud](https://lookmumnocomputer.discourse.group/u/Dud)\ **Post date:** [October 2, 2020, 5:34pm UTC](https://lookmumnocomputer.discourse.group/t/aaapppccc-u1-ic-burning/1920/14 "2020-10-02T17:34:10Z")
with the same polarity plug ? ---
**Author:** ![MoveQuick](https://avatars.discourse-cdn.com/v4/letter/m/a87d85/32.png) [@MoveQuick](https://lookmumnocomputer.discourse.group/u/MoveQuick)\ **Post date:** [October 2, 2020, 5:45pm UTC](https://lookmumnocomputer.discourse.group/t/aaapppccc-u1-ic-burning/1920/15 "2020-10-02T17:45:16Z")
As in like as it dc? I think so yeah ---
**Author:** ![heckseven](https://yyz2.discourse-cdn.com/free1/user_avatar/lookmumnocomputer.discourse.group/heckseven/32/23483_2.png) [@heckseven](https://lookmumnocomputer.discourse.group/u/heckseven)\ **Post date:** [October 2, 2020, 6:12pm UTC](https://lookmumnocomputer.discourse.group/t/aaapppccc-u1-ic-burning/1920/16 "2020-10-02T18:12:37Z")
Some DC power supplies are center positive and some are center negative. If it’s the wrong way around, it could explain the melted IC ---
**Author:** ![antoine.pasde2](https://yyz2.discourse-cdn.com/free1/user_avatar/lookmumnocomputer.discourse.group/antoine.pasde2/32/326_2.png) [@antoine.pasde2](https://lookmumnocomputer.discourse.group/u/antoine.pasde2)\ **Post date:** [October 2, 2020, 6:16pm UTC](https://lookmumnocomputer.discourse.group/t/aaapppccc-u1-ic-burning/1920/17 "2020-10-02T18:16:44Z")
> [@MoveQuick](#): > > the first IC ~~socket~~ is burning up The chip might have been defective, but it is also possible there is a short, either in your soldering or in the PCB (it’s rare but it can happen). After cleaning up the board, but before soldering the new socket in (You will use sockets from now on, won’t you?) check for shorts from the pins of that chip to ground or to power or to other pins of the chip with a multi-meter. (Check with the continuity setting or measure resistance.) ---
**Author:** ![MoveQuick](https://avatars.discourse-cdn.com/v4/letter/m/a87d85/32.png) [@MoveQuick](https://lookmumnocomputer.discourse.group/u/MoveQuick)\ **Post date:** [October 2, 2020, 6:24pm UTC](https://lookmumnocomputer.discourse.group/t/aaapppccc-u1-ic-burning/1920/18 "2020-10-02T18:24:39Z")
Yeah could do how do you check which way round it is? ---
**Author:** ![MoveQuick](https://avatars.discourse-cdn.com/v4/letter/m/a87d85/32.png) [@MoveQuick](https://lookmumnocomputer.discourse.group/u/MoveQuick)\ **Post date:** [October 2, 2020, 6:25pm UTC](https://lookmumnocomputer.discourse.group/t/aaapppccc-u1-ic-burning/1920/19 "2020-10-02T18:25:51Z")
Yeah I’ll order some sockets and check grounds I’ve still gotta clean up the solder that’s left over and then I’ll check it with the multimeter ---
**Author:** ![ChristianBloch](https://yyz2.discourse-cdn.com/free1/user_avatar/lookmumnocomputer.discourse.group/christianbloch/32/56_2.png) [@ChristianBloch](https://lookmumnocomputer.discourse.group/u/ChristianBloch)\ **Post date:** [October 2, 2020, 6:34pm UTC](https://lookmumnocomputer.discourse.group/t/aaapppccc-u1-ic-burning/1920/20 "2020-10-02T18:34:04Z")
With a multimeter. Whatever way round doesn’t display a negative voltage. There will also be an icon on the supply indicating which way it is. [Next page](https://lookmumnocomputer.discourse.group/t/aaapppccc-u1-ic-burning/1920.md?page=2)