HP G6-1270EC black screen

[DeniS182]

Hi all,
I have here this laptop water damaged little bit. After cleaning laptop turn on fan is spinning, but only black screen. And caps lock blink continuously. Then I found bad resistor near PU11, PR207 -360K. I replace it with 330K and caps lock stop blinking but still black screen only. 1.2V power rail is present, CPU and GPU heat normally, RAM voltage present. I didn't test flash bios yet, but when there is water damage I mean this is not bios problem.. and on VGA external monitor also black screen only. Any idea? Thanks.

[Techtiger]

Re: HP G6-1270EC black screen

In the Ram slot Test pin 30 75 199 203 supply any missing voltage on the coils ?

[Techtiger]

Re: HP G6-1270EC black screen

After test pin 13 34 EC supply

[DeniS182]

Re: HP G6-1270EC black screen

Thanks for answer.

30 - 0V
75 - 1.54V
199 - 3.3V
203 - 0.77V

Where to measure pin 13 34 please?

And on all coils are voltages only on charging coil is 0.6v

[Techtiger]

Re: HP G6-1270EC black screen

Thanks for answer.

30 - 0V
75 - 1.54V
199 - 3.3V
203 - 0.77V

Where to measure pin 13 34 please?

And on all coils are voltages only on charging coil is 0.6v

One of the most important single is missing now trace back pin 30 single to Q30 fet pin 1

[DeniS182]

Re: HP G6-1270EC black screen

sorry, but I don't understand what you mean. PIN 1 of Q30 is GND.

[Techtiger]

Re: HP G6-1270EC black screen

sorry, but I don't understand what you mean. PIN 1 of Q30 is GND.

Pin1 is Source CPU DRAMRST signal , what are the voltage on the Q30 pins & R374 both sides

[DeniS182]

Re: HP G6-1270EC black screen

Q30 - PIN 3 - 5V
PIN 2 - 0V
PIN 1 -0V-GND

I can't find R374 in schematic/boardview.
We have right, same schematic?

[Techtiger]

Re: HP G6-1270EC black screen

Q30 - PIN 3 - 5V
PIN 2 - 0V
PIN 1 -0V-GND

I can't find R374 in schematic/boardview.
We have right, same schematic?

My mistake i was looking different Quant R check again Ram slot pin 198 126 1 for
pin 30 M_A_RST# comes from AMD MEMORY CHANNEL so if this voltage is missing no image fault

[DeniS182]

Re: HP G6-1270EC black screen

It's ok and I measured pins:
1 - 0.77V
126 - 0.77V
198 - 1.54V
30 - 0V

So if 30 - 0V my CPU/APU is the problem?

[mcplslg123]

Re: HP G6-1270EC black screen

Often the failure point on this mb is circled. Check the requirement of these 2 IC and see if it helps.

[mcplslg123]

Re: HP G6-1270EC black screen

It's ok and I measured pins:
1 - 0.77V
126 - 0.77V
198 - 1.54V
30 - 0V

So if 30 - 0V my CPU/APU is the problem?

May or maynot be. DRAMRST# signal will not rise if apu/fch requirement are not fulfilled

[DeniS182]

Re: HP G6-1270EC black screen

this 2 IC's looks ok, output voltage is present.. hard to find the fault

[Techtiger]

Re: HP G6-1270EC black screen

this 2 IC's looks ok, output voltage is present.. hard to find the fault

so you get the out put voltage those 2 chips now check pin 14 SIO chip HWPG voltage is ok or not

[DeniS182]

Re: HP G6-1270EC black screen

14 pin sio 3.3v

[Techtiger]

Re: HP G6-1270EC black screen

what is the voltage on PL 22 is it 1.5V ? voltage on ram slot pin 116 120 200 202 ? do you try with another AMD CPU ?

[DeniS182]

Re: HP G6-1270EC black screen

PL22 - 1.1V
116 - 1V
120 - 0.89V
200 - 3.3V
202 - 3.3V

And no because I found only am4400dec23hj (AMD A6-4400M) socket looks same but I mean it's not work. " 722-pin micro-PGA package. Please note that newer A-Series processors with Trinity and Richland cores fit into the socket FS1, but they won't work in it. "

[DeniS182]

Re: HP G6-1270EC black screen

I buy right CPU. Laptop works.
Thanks all for help.