How to replace nec/tokin OE128 in laptop motherboard?

[selldoor]

Re: How to replace nec/tokin OE128 in laptop motherboard?

Post a picture so we can see what you have done.

[spleenharvester]

Re: How to replace nec/tokin OE128 in laptop motherboard?

As above. Also:

1) Use a multimeter to check for shorts between your positive side and ground. Set it to 200ohms and place one lead on the positive side and one lead on the negative side.

2) Did you remove that NEC Tokin? In its current melted state it could be shorted.

3) Check your polarity.

4) Did you test it after the NEC Tokin was melted in the first place?

It's possible one of the caps you added are shorted or that there is a bridge between the two sides.

Best of luck!

[hitmen]

Re: How to replace nec/tokin OE128 in laptop motherboard?

As above. Also:

1) Use a multimeter to check for shorts between your positive side and ground. Set it to 200ohms and place one lead on the positive side and one lead on the negative side.

2) Did you remove that NEC Tokin? In its current melted state it could be shorted.

3) Check your polarity.

4) Did you test it after the NEC Tokin was melted in the first place?

It's possible one of the caps you added are shorted or that there is a bridge between the two sides.

Best of luck!

Yes, I removed nec tokin.
Yes, I checked polarity.
May be it is shorted. Becoz using multimeter, when i placed one lead on +ev and one on -ev side, it show zero ohm resistence.
But how i identify which cap is short?

[spleenharvester]

Re: How to replace nec/tokin OE128 in laptop motherboard?

We need a picture really buddy. Did you solder the caps over where NEC tokin was or on the surrounding pads?

That short will almost definitely be your problem. If you soldered over the Tokin, check for bridges between the two conductive strips on each side. If you didn't, remove the caps one by one and check for shorts each time.

[hitmen]

Re: How to replace nec/tokin OE128 in laptop motherboard?

Is this idea right? I want to remove all caps and sold 4 wires 2 one side and 2 other side. On these wires i check caps 4 by 4.

[hitmen]

Re: How to replace nec/tokin OE128 in laptop motherboard?

note. One thing is more that i dont set the leads of lcd and inverter when i checking. I want to see that fans or hdd run or not. I think, If they run, it will be ok.?
Is this matter or not??

[hitmen]

Re: How to replace nec/tokin OE128 in laptop motherboard?

I see, there is a lettel diode between + and -. U can see in this pic.

I think if it burnt or short? Can i remove it?
There are 4 lines under nec tokin 2 +ev -ev and 2 -ev +ev, And i identified that 2 internal lines r -ev and this is same for both side and 2 external external lines r +ev which is different for both sides. I identified that 2 infra lines r not short but 2 ultra lines r seemed to short and lettel diode is there between + and- which i mentioned above.
Is this matter????

[hitmen]

Re: How to replace nec/tokin OE128 in laptop motherboard?

im waiting for ur replies and my laptop is opened and my work is still stop for ur best suggestion.
Please please. . .

[hitmen]

Re: How to replace nec/tokin OE128 in laptop motherboard?

I found a new thing about my problem is that, in my laptop nec tokin was near the processor and other side the PCB, when i removed processor, there is no shortness in both pair of lines where was nec tokin and multimeter show 400 resistence in the lines but when i putt processor then one pair of line which lower and more near the processor is short and multimeter show zero resistence in the lines.
What is reason of that????
Please please help me experts. . .
I am waiting thirstily. . . .

[rievax_60]

Re: How to replace nec/tokin OE128 in laptop motherboard?

I found a new thing about my problem is that, in my laptop nec tokin was near the processor and other side the PCB, when i removed processor, there is no shortness in both pair of lines where was nec tokin and multimeter show 400 resistence in the lines but when i putt processor then one pair of line which lower and more near the processor is short and multimeter show zero resistence in the lines.
What is reason of that????
Please please help me experts. . .
I am waiting thirstily. . . .

It is normal for the CPU to measure a few ohms like 5 ohms.

[hitmen]

Re: How to replace nec/tokin OE128 in laptop motherboard?

It is normal for the CPU to measure a few ohms like 5 ohms.

Then what is problem.
Please read my whole thread.

[rievax_60]

Re: How to replace nec/tokin OE128 in laptop motherboard?

You say you have removed the NEC/TOKIN capacitor. Are the pads for the outer 2 strips connected to each other?
Send another picture so we can see what has been done.

[hitmen]

Re: How to replace nec/tokin OE128 in laptop motherboard?

You say you have removed the NEC/TOKIN capacitor. Are the pads for the outer 2 strips connected to each other?
Send another picture so we can see what has been done.

Yes, i removed nec tokin.
No, outer + lines r not connected each other but inner - lines r already same for both. I will try to upload pic.
What i do now??

[rievax_60]

Re: How to replace nec/tokin OE128 in laptop motherboard?

Yes, i removed nec tokin.
No, outer + lines r not connected each other but inner - lines r already same for both. I will try to upload pic.
What i do now??

It seems that the NEC/TOKEN capacitor is being used as "Filter circuit design"
It is explained here,

Take a look at the PDF so you will understand.

[hitmen]

Re: How to replace nec/tokin OE128 in laptop motherboard?

You say you have removed the NEC/TOKIN capacitor. Are the pads for the outer 2 strips connected to each other?
Send another picture so we can see what has been done.

Is i have to connect 2 outres strips also??

[rievax_60]

Re: How to replace nec/tokin OE128 in laptop motherboard?

Is i have to connect 2 outres strips also??

Yes, I think so but first take note of which side goes to the CPU. It will measure low resistance to ground with the CPU installed.

[hitmen]

Re: How to replace nec/tokin OE128 in laptop motherboard?

Yes, I think so but first take note of which side goes to the CPU. It will measure low resistance to ground with the CPU installed.

Thanks for ur swift reply.
Okay i m trying this. . . . .

[rievax_60]

Re: How to replace nec/tokin OE128 in laptop motherboard?

Thanks for ur swift reply.
Okay i m trying this. . . . .

You will need to add extra capacitors of the correct type to replace the NEC/TOKIN capacitor. Are you going to do this?

[hitmen]

Re: How to replace nec/tokin OE128 in laptop motherboard?

You will need to add extra capacitors of the correct type to replace the NEC/TOKIN capacitor. Are you going to do this?

Thanks
Perhaps u dont read my whole thread????
Please read it.
Then i will tell u that which type of combinations of caps i already checked. Please. . . .

[hitmen]

Re: How to replace nec/tokin OE128 in laptop motherboard?

You will need to add extra capacitors of the correct type to replace the NEC/TOKIN capacitor. Are you going to do this?

I tried these combination
5*220uf,4v.
6*220uf,4v.
3*330uf,2.5v+1*220uf,4v.
3*22uf,4v+2*330uf,2.5v.
2*330uf,20v+2*220uf,2.5v.
But nothing.
By do all this, when i press power button, indicators light up for one time and off, no fans , no hdd run. Laptop looking like to died.