Acer Extensa 4420-5212. Laptop
I was replacing a broken screen. After I replaced it, I plugged the laptop back in, pressed the power button....and....nothing. No power, No LEDs, nothing. Will not run on battery or AC. Laptop worked great before, just had to plug it in to external display.
After checking (which is what I should have done in the first place) the new ribbon cable, I noticed that even though the wire colors were the same as the old one, the wire pinout (from connector A Laptop mobo, to connector B LCD Screen) was different from the original old ribbon cable. I should have just used the old cable...I just thought the old one could wear and tear or crack over time, and that it would be better in the long run to use the new one. Im an idiot for not looking at the new cable closely lol. Anyways, here's the weird stuff:
Even thought there was no smoke, ur burnt smell/burnt components, I did notice that the RAM module DIM # 2, had been burnt on one of the pins (If anyone would like pictures of anything im talking about, plz let me know). This laptop is the model that has 3GB ram, 1GB in DIM slot #1, and a 2gb stick in DIM slot #2. The 1gb RAM in slot #1 is fine, as is the socket, but the damaged pin on the 2gb RAM stick....the gold flake that was burned off the pin, was actually stuck to the RAM socket, thats why I think It got super hot. but since it didnt take all the gold off the pin/tracer/contact of the RAM, the RAM stick actually still works. I Put it in a friends laptop. Thats amazing, I usually dont have that luck lol.
So anyways, the laptop still doesnt boot up, but when I plug it in, 2 components on the mainboard get very very hot. its so hot you cant touch it for more than a second. The first component is: ISL6236. here is some info on that:
The ISL6236 dual step-down, switch-mode power-supply
(SMPS) controller generates logic-supply voltages in
battery-powered systems. The ISL6236 include two
pulse-width modulation (PWM) controllers, 5V/3.3V and
1.5V/1.05V. The output of SMPS1 can also be adjusted from
0.7V to 5.5V. The SMPS2 output can be adjusted from 0V to
2.5V by setting REFIN2 voltage. An optional external charge
pump can be monitored through SECFB. This device features
a linear regulator providing 3.3V/5V, or adjustable from 0.7V to
4.5V output via LDOREFIN.
There's a ton of info about this Intersil chip on their site, including a pinout. If anyone wants me to post that info I will, but that info can also be obtained by google'n this part. This part is surrounded by inductors and capacitors, and is just north of what i think is the GPU. This chip is also fairly close to the ram sockets. I should mention that all these components are on the same side of the PCB.
The next hot component:
If you flip the mainboard over, and look underneith the RAM sockets (the RAM sockets are on the other side of the PCB), there is a very small black component, that has 5 pins, 3 on one side, 2 on the other. It too gets very hot, and I guess makes sense since its right under the RAM sockets. I thought maybe this component being hot and bad was maybe sending feedback to that second RAM socket, and maybe thats what burnt that RAM stick. So I put the good 1GB stick in that socket, but it didnt burn it, so maybe it was the current from the wrong wire of that LCD ribbon cable. I dont know what component this is (maybe EC or U), but its labeled 909YU, or 909VU.
Im gona guess that when I plugged that bad cable in the mainboard, it caused feedback/short/current that traveled all the way down a tracer point, until it finally damaged something. I used this laptop for school, and would appreciate and help, or even where I should begin. Just because these 2 components are hot, doesnt mean they are bad, right? I mean, could the bad component be causing these components to be hot? I can take pictures of anything you want, just as and I'd be more than happy to.
One more thing, I got behind in school work, so I thought I would do it on my desktop....and of course, my hard drive just went bad. Its a 1tb Hitachi. It makes a noise similar to beep, click, beep. The beeps kinda sounds like quite screaming )poor thing
and the click is the actuator arm smacking into either the cylinder or the outside wall. The SATA board on the underside of the harddrive, It has a component/logic labeled: LSI UAB-M3071-S, and gets very hot. once it gets failure hot, is when the beep/click starts (1-2 seconds after poweron. Static damage? I took the I/O board off the hard drive, and plugged it into power source...It didnt heat up. Interesting. I plugged the hard drive spindle power cable (small orange flexible ribbon cable attached to the under-side center of the drive) back into the HDDs I/O board, and plugged the power back in. the component heated back up as expected, but magically cooled back down after about 5 seconds. Interesting, right? Anyways I know this is very long, so thank you for taking the time to read any of this. Any questions or comments are very welcome.
-Steve
I was replacing a broken screen. After I replaced it, I plugged the laptop back in, pressed the power button....and....nothing. No power, No LEDs, nothing. Will not run on battery or AC. Laptop worked great before, just had to plug it in to external display.
After checking (which is what I should have done in the first place) the new ribbon cable, I noticed that even though the wire colors were the same as the old one, the wire pinout (from connector A Laptop mobo, to connector B LCD Screen) was different from the original old ribbon cable. I should have just used the old cable...I just thought the old one could wear and tear or crack over time, and that it would be better in the long run to use the new one. Im an idiot for not looking at the new cable closely lol. Anyways, here's the weird stuff:
Even thought there was no smoke, ur burnt smell/burnt components, I did notice that the RAM module DIM # 2, had been burnt on one of the pins (If anyone would like pictures of anything im talking about, plz let me know). This laptop is the model that has 3GB ram, 1GB in DIM slot #1, and a 2gb stick in DIM slot #2. The 1gb RAM in slot #1 is fine, as is the socket, but the damaged pin on the 2gb RAM stick....the gold flake that was burned off the pin, was actually stuck to the RAM socket, thats why I think It got super hot. but since it didnt take all the gold off the pin/tracer/contact of the RAM, the RAM stick actually still works. I Put it in a friends laptop. Thats amazing, I usually dont have that luck lol.
So anyways, the laptop still doesnt boot up, but when I plug it in, 2 components on the mainboard get very very hot. its so hot you cant touch it for more than a second. The first component is: ISL6236. here is some info on that:
The ISL6236 dual step-down, switch-mode power-supply
(SMPS) controller generates logic-supply voltages in
battery-powered systems. The ISL6236 include two
pulse-width modulation (PWM) controllers, 5V/3.3V and
1.5V/1.05V. The output of SMPS1 can also be adjusted from
0.7V to 5.5V. The SMPS2 output can be adjusted from 0V to
2.5V by setting REFIN2 voltage. An optional external charge
pump can be monitored through SECFB. This device features
a linear regulator providing 3.3V/5V, or adjustable from 0.7V to
4.5V output via LDOREFIN.
There's a ton of info about this Intersil chip on their site, including a pinout. If anyone wants me to post that info I will, but that info can also be obtained by google'n this part. This part is surrounded by inductors and capacitors, and is just north of what i think is the GPU. This chip is also fairly close to the ram sockets. I should mention that all these components are on the same side of the PCB.
The next hot component:
If you flip the mainboard over, and look underneith the RAM sockets (the RAM sockets are on the other side of the PCB), there is a very small black component, that has 5 pins, 3 on one side, 2 on the other. It too gets very hot, and I guess makes sense since its right under the RAM sockets. I thought maybe this component being hot and bad was maybe sending feedback to that second RAM socket, and maybe thats what burnt that RAM stick. So I put the good 1GB stick in that socket, but it didnt burn it, so maybe it was the current from the wrong wire of that LCD ribbon cable. I dont know what component this is (maybe EC or U), but its labeled 909YU, or 909VU.
Im gona guess that when I plugged that bad cable in the mainboard, it caused feedback/short/current that traveled all the way down a tracer point, until it finally damaged something. I used this laptop for school, and would appreciate and help, or even where I should begin. Just because these 2 components are hot, doesnt mean they are bad, right? I mean, could the bad component be causing these components to be hot? I can take pictures of anything you want, just as and I'd be more than happy to.
One more thing, I got behind in school work, so I thought I would do it on my desktop....and of course, my hard drive just went bad. Its a 1tb Hitachi. It makes a noise similar to beep, click, beep. The beeps kinda sounds like quite screaming )poor thing
and the click is the actuator arm smacking into either the cylinder or the outside wall. The SATA board on the underside of the harddrive, It has a component/logic labeled: LSI UAB-M3071-S, and gets very hot. once it gets failure hot, is when the beep/click starts (1-2 seconds after poweron. Static damage? I took the I/O board off the hard drive, and plugged it into power source...It didnt heat up. Interesting. I plugged the hard drive spindle power cable (small orange flexible ribbon cable attached to the under-side center of the drive) back into the HDDs I/O board, and plugged the power back in. the component heated back up as expected, but magically cooled back down after about 5 seconds. Interesting, right? Anyways I know this is very long, so thank you for taking the time to read any of this. Any questions or comments are very welcome. -Steve
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