Few short circuits in the motherboard and Fix

会员1244779 · 发表于 2020-10-25 04:35:09

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本帖最后由 vusalcrm 于 2020-10-25 04:38 编辑

Hello to everyone

Model: Dell 3537
MB Code: LA-9981P

Problem of motherboard: Short circuit
1. First appeared on the motherboard this was the problem. SY8206D (+1.05VSP). Its pwm was burned and there was a hole in the pcb. Remove pwm.
I cleaned the burnt part. Replace SY8206D -> SY82068D

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2. Power supply connected and short circuit. RTL8106E started to warm and remove ic.
3. Let's start the measurements now. +1.05VSP PL301 - 0.6 Ohm. This is not normal full short circuit.
That means the CPU is corrupt. When I put 1 voltage on that line, the chipset started to get hot.
4. There was also a short circuit in this line +3VALW_PCH. J513 (Jumper) - 0.4 Ohm.
I'm sure now the CPU is broken

5. Other short circuit GPU and VRAM-s.
GPU coil PL802 1.5 ohm.
VRAM coil PL1101 +1.35VGPUP - 0.8 ohm.
6. CPU, GPU and VRAM-s remove. All short circuits disappeared. Everything is normal.

This is an Intel U series processor. i5-4200U. An expensive CPU.
Intel's processors are always expensive.

I offered the client an i3-4005U CPU. Second hand. I did not change the GPU.
The customer accepted in that case. UMA only.
And I started trading...

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