pappothar
Member
Last Activity: 10-10-2025, 08:22 AM
Joined: 04-27-2023
Location: chiasso
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no, its fed by a 20V and a 3.3V, the 20v is steady, the 3.3 is pulsed as shown in the oscillogram above... -
but the display is disconnected, it cannot be a short on that side of the connector...Leave a comment:
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[QUOTE=DeXXter;n3742346]
ok thanks, with the probe with + on gnd, i got diodes on both cristals, so it does not seem to be a ball crack problem, also the diodes are ok if i press or heat the cpu, so it seems ok after all
The weird thing is that i got only KB backlight and fans, the display is off, the +lcd_vdd is pulsed and i tracked back the signal until the cpu, the signal CPU_ENVDD is pulsed exactly in the same way, 3 pulses always the same on - off time, so cannot be a coincidence... DAMN !...Leave a comment:
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ALready done, the LCD is unconnected now, the display fuse is ok, is not open. The led_vdd voltage si present on the display connector (20V), but +LCD_VDD is strange, when i switch on the notebook it goes up and down and then stays off, with or without the panel connected (see picture)...
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[QUOTE=DeXXter;n3740126]
I found this video vith the oscillator issue, but the multimeter is connected with positive to GND ! in this case i measure the diode voltages, but is it right ?
https://www.youtube.com/watch?v=4lBdUQ3gkd4...Leave a comment:
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I pressed, no change, the 32khz oscillator is still OL with multimeter...Leave a comment:
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As far as i know, i cannot see any trace of moisture or humidity, under the microscope the board is clean, seems quite new...
one question about the cristal test with multimeter, it's a standard measure with negative on ground and positive on the oscillator pin ?...Leave a comment:
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tested with fluke 117 in diode mode, the 32khz cristal seems unconnected (dmm shows OL) , but it oscillates when the mobo is on ; the 48Mhz shows 1,1V on both pins (vs gnd)...Leave a comment:
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ok maybe i'm influencing the pin with the probe......Leave a comment:
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but pin 1 of 32khz oscillator does not, it's a dc voltage, see the oscillograms, please it's a 0.5v continuous...Leave a comment:
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i checked the 2 oscillator
X32K_X1 -> 0,5V dc
X32K_X2 -> sinus 1Vpk (see pics) @32khz
X48M_X1 -> sinus 1Vpk (see pics) @48Mhz
X48M_X2 -> sinus 1Vpk (see pics) @48Mhz
on X32K_X1 should be a sinus 1Vpk (see pics) @32khz ?...Leave a comment:
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But how do uou know is a bios issue ?...Leave a comment:
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Lets' say that now this is the situation
1 - found EC shorted, changed with one bought on aliexpress i paid for programmed, no more short, now the keyboard is on (i can set the KB led color and the power button is white, fans spins)
2 - checked every voltage present on the board, all is present and in expected values ; CPU and GPU warms up
3 - No signal on LCD, not even backlight works, i tested all the pins with multimeter in order to find stange impedances, but found none
4 - i also bought a new bios chip and chenged it but issue remains
5 - i checked also...Leave a comment:
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Same as above, i think this world is full of "technicians", doing their job badly and reporting failures to customers they made...
"and ot even that fixed this damn laptop"
Im an electronic engineer and as you i do not accept a non working hardware as an answer 
...
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I think you can be right, i found previous owner or technician made a short on one of the DC pins (see pic) to somewhere else, probably to ADAPTOR_ID as you said ; i tested the line and it seems ok now, i checked with the thermal camera, no visible hot spots as previously with the IC shorted...
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Hi
This is mine, they said is already programmed. i soldered under microscope and it seems ok to me...Leave a comment:
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bump...Leave a comment:
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But you corrupted all 3 chips ? isnt' only UB2 the bios chip that is programmed via official bios update ?...Leave a comment:
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nice cat...
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