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sorry, it was a mistake. no enable signal for LDO1, that is why there is no voltage output for 2.5v ddr supply. My question is why there is no CLK reading on PIN6 of my SPI ROM chip, i measured it using multimeter and an oscilloscope. no clk input, that is why i cant move on another troubleshooting because reflashing of bios is non sense if my spi rom have no CLK on pin 6.
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You mean pin 6 of PU500? well its 150kohm and rising due to capacitor coonected PC520
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Update : i already tried several dump bios for this mainboard, but nothing happens. here is my observation...that my SPI ROM chip have no SCLK reading (pin 6) and SDO have nothing as well. i used multimeter and DSO for measurements. please help what am i missing here, why no SCLK and SDO reading? thanks...
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i already told in post #4, 1,11,16,29,31 and 36 have a logic high enable signal.....of course VIN is present because of PL500 have output, anyway i have checked it and VIN is present
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UPDATE : PU500 has the following output
* PL500 has 1.05V
*PL501 ...none
*PL502...none
LDO1 ----NONE ( supposed to be 2.5vDDR Supply )
LDO2...1.8V
pins 1,11,16,29,31 and 36 have a logic high enable signal
my question is...is this a sign of deffective PU500 chip (LV5075BGQV) ?
please advise...thanks in advance !!!...
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Yes it is, from logic high to logic low then back to high the moment switch was released...
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Lenovo laptop dead motherboard GS752 NM-C781rev. 1.0 2019-11-25 inscribed at the pcb,
I have a dead laptop with mainboard model GS452/552/752 nm-c781 rev 1.0, i have initiated troubleshooting with the use of digital multimeter. checked voltage signals up to PM_SLP_S3#, found out that before PM_SLP_S3# signal , a PBTN_OUT#_R signal has 3.2 volt state and after pressing power on, PBTN_OUT#, It drops to logic level zero for around 12 secs and then back again to 3.2v for 6 secs. it will loop like that until you pulled out the adapter power. during loop the PM_SLP_S3 and S4 SIGNAL has no output. (0 volt ) may i ask for help to anyone with this kind of board and same kind of problem....1 Photo
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acer aspire 5742z dead motherboard
hello, may i ask for help? i have a acer 5742z laptop with board PEW71 LA--6582P AND IT IS NOT POWERING on.
Here is the status:
1. c273 already have 1.5 v even at s5
2. 3v and 5 v always on power rail is ok as evident in u31 pin8 have 3.3v, pl46 and pl47 have readings.
3. JLED1 pin7 have 17.94 vdc for ON/OFFBTN# signal
i already flash EC BIOS and SPI rom but item #1 still exist. U18 i flash it with 4,096kb of bin file and U31 i flash it with 128kb. downloaded from other site. my question is it correct that u31 flash is 128kb and u31 with 4mb?...
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bios dump for Lenovo Legion Y520-15IKBN
does anyone here have a bios dump for lenovo legion y520-151kbn model 80wk
MTM 80WK0025PH with sn PF0Y5NBW
pcb DY512 NM-B191 rev. 1.0
LAPTOP powers on but no 1.2v for ram supply and PL3502, PL1401 have 0 volt output, 5v and 3.3v is present. all other coils dont have reading after switching on. only LED1 Indicator lits up. batt charging is ok.
here attached is my original bin file
Thanks...
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Re: Dell Latitude 3420 Bios Password unlock
im using ch341a programmer and the spi chip is a winbond w25r256jv...
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Re: Dell Latitude 3420 Bios Password unlock
i tried bin file that you unlocked but asprogrammer is freezing/hang-up.
isolated the problem by trying the original bin file and the password unlock only bin file with no problem....
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Re: Dell Latitude 3420 Bios Password unlock
@lapfix, sir, is there an option besides desoldering the chip and have it reflash by programmer? if none, then i have to do it all again byflashing with your new uploaded bin file for my bios chip.
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Re: Dell Latitude 3420 Bios Password unlock
i have resoldered the bios chip, admin password now unlock, but i cant disable absolute because of computrace.
in post 32 is my original bin file.
pls. help. TIA
STAG ...G5ZQ1B3-8FC8
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Re: Dell Latitude 3420 Bios Password unlock
@ aldopc ...it works...thank you very much!
now last thing, besides putting your service tag, what else should i set?
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Re: Dell Latitude 3420 Bios Password unlock
thanks, i will try now. i will update here once done
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Re: Dell Latitude 3420 Bios Password unlock
pls. help, i need to unlock the bios with admin password, service tag is G5ZQ1B3-8FC8
im using ch341a programmer
thanks...
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Re: samsung np500p4c need to fix bios
@Mulong
what is your exact mainboard model and ser. no.?
is it Ba41-01935a?
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Re: BA41-0938A PTC BOARD Model XIDAN-14 Rev 1.2 need help
600kohms down to 50kohms then back again to 600k, maybe due to capacitor across L507 to gnd and L10 inductors to gnd. but definitely is not shorted.
temperature is dead cold. as there was no 3.3v_alw and 5.0v_alw output from L10 and L507, the only outputi get is the 2.0v ref , 3.3v LDO and 5.0v ldo on pin3,8 and 17 respectively of tps51125.
as per datasheet of tps51125, if entrip1 and entrip2 is enabled...it should produce an output on L507 and L10, andthats my problem i think. en0 is ok, VIN is also ok. the missing...
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