I noticed that DC1 was heating up a lot and so I checked on pin 1 of DC1 and between pin 1 and ground I have a short so 0ohm.
I tried to inject 3v on pin 1 of DC1 and I noticed that it heats up the processor, so it is the one that is shorted
dclass-pro
Senior Member
Last Activity: 12-19-2024, 10:05 AM
Joined: 12-14-2022
Location: Lecce
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Hi guys, sorry for my absence... I discovered the problem.
The +3V_LID line was shorted and unfortunately it comes from the processor.
I'm sorry but it's not repairable, thanks to all guys, see you next time...Leave a comment:
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checking on the diagram I have on the 2 ICs of the 5v and the 3v only the ENLDO_3V5V of about 4.3V but I am missing the 3VL which perhaps must be generated by the charger, but it is not generated by pin 5 ACOK.Leave a comment:
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la-h329p
schematic [B][FONT=Arial][B][COLOR=#111111]la-h329p[/COLOR][/B][/FONT][/B]
schematic [B][FONT=Arial][B][COLOR=#111111]la-h329p[/COLOR][/B][/FONT][/B]
schematic [B][FONT=Arial][B][COLOR=#111111]la-h329p[/COLOR][/B][/FONT][/B]
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I didn't understand in which section I have to put the diagram, can I have the link?
for the charger it mounts the BQ24735R, between the SDA/SCL lines and ground I have about 600K so it seems ok...
here are the values measured with the charger connected:
REGN - 5.9V
VCC - 19V
ACDRV - 25.6V
ACN - 19.3
ACP - 19.3
CMSRC - 19.3VLeave a comment:
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HP la-h329p no power
Hi guys, I have this notebook that does not turn on. HP la-h329p
When I connect the power supply the white light does not turn on but it does not generate the 3v and 5v.
I find the voltage in the P2 pin so the first 3 mosfets are working, I also changed the charger and the problem persists.
On the battery connector I have about 2.8V on +BATT but on SDA and SCL I have 0V.
I checked and the 3v and 5v coils are not shorted to ground.
What can I try? -
thanks guys I laughed, in fact Q9706 was damaged. I changed it and the backlight came back!!! Thanks a lot, but now I noticed that when I close the display the backlight does not turn off. the display always stays on even when closed.
What could it be?Leave a comment:
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so do you recommend me to change Q9706?Leave a comment:
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[B]ALL_SYS_PWRGD[/B] = 3.3V[B]ALL_SYS_PWRGD[/B] = 3.3VLeave a comment:
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R0910 0v-0v
r9715 BKL_EN 0.4v
I2C_BKL_1_SCL ; 3.3v
I2C_BKL_1_SDA ; 3.3v
LCD_BKLT_PWM ; 0.4vLeave a comment:
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I made a mistake in checking, the image is there and the backlight is missing, in fact I see the user at login if I put the flash on the screen... what can I check?Leave a comment:
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Unfortunately I don't see any image on the displayLeave a comment:
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I followed this guide and also tried to change U9701 but I have no changes.
On the D9701 diode I always have 0v on both sidesLeave a comment:
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No display a1278 820-3115-B
Hi guys, I have this macbook a1278 which doesn't have any image on the display, but when I turn it on I hear the chime.
I found the L9008 choke open and reset it.
When I turn on the macbook I have about 3v on pins 3 and 4 of the display so everything is ok but I still don't have the image.
On the backligt pin 21 and 22 I have 0v but the fuses are all ok.
What can I check?
I tried another display from a macbook a1278 but from the previous year and it still doesn't work. -
HP 440 G2 no power after short in flat lcd
Hi all guys, I need your help. On a HP 440 G2 - LA-B181P laptop I was changing the speakers and the pc worked fine everything ok.
After closing it all with all the screws I realized that it would no longer turn on. I opened it and found that the flat cable of the LCD was shorted. I ordered a new flat but the motherboard still won't turn on, as soon as I connect the power supply the connector LED always flashes and the power button stays on.
I tried to check the voltages and the 3v and 5v are there, on the battery pin (with no battery connected) I have about 2v.
I tried to... -
Re: Macbook A1278 no charge
I confirm that on both sides of F7040 I have 12.94VLeave a comment:
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Re: Macbook A1278 no charge
PP3V42_G3H voltaje - 3.4V
voltaje on pin 14 of U7000 sometimes it's 0v and sometimes it's 3.3v
SMC_RESET_L 3,4V
How can I check if the DCIN connector is working?Leave a comment:
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Macbook A1278 no charge
Hi guys, I have this macbook with 820-2936-b logic board that only turns on on battery.
I tried changing the charging connector the SMC controller and the cairca ic but it still doesn't work. When I plug in the magsafe I have no light, as soon as I plug it in with no battery the mac won't turn on (usually all turn on).
I did the various checks and only with the charger connected to the U700 pin I have:
pin2 - 16V
pin3 - 3.8V
pin19- 5V
pin14 - 3.3v
PPBUSG3H have 3.4V
absorption with bench power supply 0.07A
do you have any ...
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