Hi all,
I wonder whether the LA-J482P M76378-601/ M76376-601 schematics is available.
Thanks,
-jp...
jaroslav.psenicka
Member
Last Activity: Yesterday, 01:47 PM
Joined: 07-27-2020
Location: Černošice
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HP ENVY X360 13-AY Ryzen7 5800U board LA-J482P M76378-601/ M76376-601 schematics
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Apple MBP A1398 EMC 2881 No backlit, PP3_G3H drops to 10.8V after start, 0V on LVDS pin 1
Hi all,
I have a MBP A1398 EMC 2881 here, it chimes, boots and shows picture on external screen
there is an apple logo on the display, no backlit
I measured the PP3_G3H on the backlit fuse - it's 12.6V when not powered and it drops to 10.8V after startup.
Is this OK?
Also measured the LVDS connector pin 1, there is 0V, could that be the backlit driver chip?
Also checked all 4 "backlit" capacitors, all OK, not shorted.
Thank you very much,
-jp -
oh, the PCH is getting hot when the board is powered
also, as [USER="149220"]mcplslg123[/USER] mentioned [URL="https://www.badcaps.net/forum/troubleshooting-hardware-devices-and-electronics-theory/troubleshooting-laptops-tablets-and-mobile-devices/3247738-hp-13-ad017nc-doesn-t-start?p=3249181#post3249181"]here[/URL], the 1R4 to ground at 1V rail is "considered too low indicating perhaps towards a shorted PCH"
-jpmcplslg123 -
HP 13-AD017NC, no POST, LED OK
Hi guys,
I've got HP 13-AD017NC board 6050A2919201-MB-A01, not POSTing,[LIST][*]some voltages are present, see attachment[*]no direct short[*]no USB activity[*]LED is on[*]power button shorts to ground OK[*]no fan spin[*]CPU is warm, GPU stone cold[/LIST][ATTACH=JSON]{"data-align":"none","data-size":"full","data-tempid":"temp_350084_1725815494889_715","title":"image.png"}[/ATTACH]
what do you think?
haven't tried the BIOS flash, not sure where the chip is
may be the SIO... -
Thanks SMDFlea, it's 6050A2919201-M-A01
-jpLeave a comment:
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HP ENVY 13-ad017nc schematics needed
Hi folks,
just wonder whether the schematics for ENVY 13-adxxxxx is available
many thanks,
JP -
Raspberry PI-TOP v3 schematics
Hi all,
just wonder whether the Raspberry PI-TOP v3 schematic is available?
not the Raspberry PI itself, but this little add-on board:
[ATTACH=JSON]{"data-align":"none","data-size":"full","title":"15175-pi-top_with_Inventor_s_Kit_-_Raspberry_Pi_Laptop-04a.jpg","data-attachmentid":3269081}[/ATTACH]
thanks,
-jpHi all,
just wonder whether the Raspberry PI-TOP v3 schematic is available?
not the Raspberry PI itself, but this little add-on board:
... -
that would be awesome @mon2,
if I can identify the rail, I may find the mosfet and the corresponding controller, one of these may be bad IMO
I wonder what rail is missing... could be something like B+?
the board is not labeled (no silkscreen), the coil of missing rail is R47 (0.47uH?)
this is actually an ebay find, not a clear history, not many signs of misuse of water damage
-jpLeave a comment:
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Thank you very much @mon2,
here are the measurements:
[ATTACH=JSON]{"data-align":"none","data-size":"medium","data-attachmentid":3263872}[/ATTACH]
I'm testing the board outside of the laptop, with no battery connected, this may explain the low voltage on the BAT line (?)
the resistance to ground on BAT is almost 500 ohm, looks OK to me
the VIN is 20.1V, sounds good to me either
-jpThank you very much @mon2,
here are the measurements:
[ATTACH=JSON]{"data-align":"none","data-size":"medium","data-attachmentid":3263872}[/ATTACH]...Leave a comment:
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Lenovo Yoga 13 Panasonic, no video, fan OK, missing voltage rail (?)
Hi all,
I have a Lenovo Yoga 13 Panasonic here, when powered[LIST][*]both fans spins (the sconds starts with a bit of a delay), no image neither on HDMI nor the display[*]most voltage rails seem OK (see image below, red labels)[*]resistnace to ground mostly seem OK as well (blue labels)[/LIST]the only suspicious is the 0.0V rail (2nd from left, top row)[LIST][*]the resistance to ground is rather low (1.9ohm)[*]when injecting the voltage (1V), it consumes around 200mA, seems OK to me (?)[/LIST]also tried new BIOS, no change
I can't find a schematics for the board - can some of... -
It is Yoga 13 MB PanasonicLeave a comment:
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Lenovo Yoga 13 (20175)
Hi all,
just wonder whether there is a schematics and/or boardview availale for Lenovo Yoga 13 (20175)
Thanks,
JP -
Lenovo Yoga 2 13 LA-A921P - missing SYSON
Hi all,
I have a LA-A921P here on AC adapter[LIST][*]power LED on[*]button SW1 (power) pressed[*]the CPU gets warm[*]fan not spinning[*]no dead short found anywhere[*]+5VALW/+3VALW present[*]DDR_VTT_PG_CTRL is 5V[*]SYSON is 0V[/LIST]the +0.675VSP and +1.35VP is missing, assuming because of missing SYSON signal
SYSON is not shoted to ground
the SYSON is generated by U51
hope it's not it
Is there anything i can test?
Many thanks,
-jp- Hi all,
I have a LA-A921P here on AC adapter[LIST] - power LED on
- button SW1 (power)
- Hi all,
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AL._.EX, you're a hero, thank you very much
-jpLeave a comment:
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Jaroslav from Černošice, Czech Republic
hobbyist, I love to return things back to lifeLeave a comment:
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searchable, that's great
thank you very much AL._.EX
-jpLeave a comment:
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hi all,
just wonder whether the posted boardview of Quanta X81 matches theX8B DA0X8BMB6F0 rev F
looks a bit different to me...
-jp
Leave a comment:
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Boardview for Lenovo 120S-11&14IAP
hi all,
looking for boardview of Lenovo 120S-11&14IAP, found the schematic only so far
can anyone help here, please?
thanks, JP -
Dell Latitude 7490, no POST, no fan, LED on
hi all,
I have a Dell Latitude 7490 here, when I connect the charger[LIST][*]the powerbutton LED turns on, no fan spin (the +5V rail is present on the connector though)[*]the front LED turns on[*]all voltages incl. +VCC_CORE (0.8V) are on, +VCC_GT is not present[*]connected USB blinks momentarily, being accessed probably[*]the screen backlight blinks as well (I believe, it's very short)[/LIST]after a little while (5-10 sec, maybe more)[LIST][*]powerbutton LED turns off, the front LED remains on[*]+VCC_CORE disappears, some rails remains present (5V and 3V)[*]the CPU is not warm[/LIST]may...
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