Repair [B]stopped for NOW[/B] on this [B]ASUS Zenbook UX334FAC (UX334FL REV2.0) [/B]
-Lack of knowledge, don't know what and how much it needs to [B]POST.[/B]
-Missing information about [B]MP2969B -PWM
-[/B]Missing information about [B]SYV731RAC -DOWN CONVERTER[/B]
Post will be here as small help for those with similar problem.Repair [B]stopped for NOW[/B] on this [B]ASUS Zenbook UX334FAC (UX334FL REV2.0) [/B]
-Lack of knowledge, don't know what and how much it needs to [B]POST.[/B]
-Missing information about [B]MP2969B -PWM
gjgib
Senior Member
"Learning and sharing..."
Last Activity: 01-28-2025, 04:10 PM
Joined: 11-22-2022
Location: Porlamar
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Check the post selected answer. What's your issue with that laptop model?...Leave a comment:
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Has anyone experimented this weird behavior from the impedance value of anything as I mentioned in Post #10....Leave a comment:
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Thanks. The problem is that I couldn't find exactly [B]DRAMRST# [/B]right?Thanks. The problem is that I couldn't find exactly [B]DRAMRST# [/B]right?Thanks. The problem is that I couldn't find exactly [B]DRAMRST# [/B]right?Leave a comment:
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Couldn't find the [B]RAM-IC [/B]anywhere. This is its inscription.
[URL=filedata/fetch?id=3302606&d=1720143641][ATTACH=JSON]{"alt":"Click image for larger version Name:\tSin t\u00edtulo.jpg Views:\t0 Size:\t557.3 KB ID:\t3302606","data-align":"none","data-attachmentid":"3302606","data-size":"thumb"}[/ATTACH][/URL]
Marks: [B]B[/B][B]CLBXA[/B].
Boardview calls it: DOWN CONVERTER [B]SYV731RAC[/B]//SILERGY QFN3*3-20
Btw, I know it kinda varies from [B]IC to IC, [/B]but are these...Leave a comment:
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Also meassured the [B]RAM IC[/B], don't seem to have any wrong values but the [B]pin10-(P_DDR_LDO_EN_10) [/B]seems weird to me, maybe I'm wrong since it's a [B]LDO Voltage[/B]. (Voltages in image, also)
[ATTACH=JSON]{"data-align":"none","data-size":"thumb","data-attachmentid":3302467}[/ATTACH]
Also meassured the [B]RAM IC[/B], don't seem to have any wrong values but the [B]pin10-(P_DDR_LDO_EN_10) [/B]seems weird to me, maybe I'm wrong since it's a [B]LDO Voltage[/B]. (Voltages in image, also)
[ATTACH=JSON]{"data-align":"none","data-size":"thumb","data-attachmentid":3302467}[/ATTACH]...Leave a comment:
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Here I found something with different name that looks just like the line I've shown above.
[ATTACH=JSON]{"data-align":"none","data-size":"thumb","data-attachmentid":3302436}[/ATTACH]
Line [B]+V_DDR_WR_VREF01_DIMM[/B] has [B]0.6V. [/B]Here I found something with different name that looks just like the line I've shown above.
[ATTACH=JSON]{"data-align":"none","data-size":"thumb","data-attachmentid":3302436}[/ATTACH]
Line [B]+V_DDR_WR_VREF01_DIMM[/B] has [B]0.6V....Leave a comment:
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In this post about [URL="https://www.badcaps.net/forum/troubleshooting-hardware-devices-and-electronics-theory/troubleshooting-laptops-tablets-and-mobile-devices/95576-ux330uar-rev-2-1-no-display"][B]UX330UAR rev 2.1 no DISPLAY[/B][/URL], DRAMRST# is missing. I tracked the line and it comes from the [B]+1.2V [/B]through a [B]Resistor[/B] which I don't know the value because the [B]BV [/B]doesn't show.
[URL=filedata/fetch?filedataid=342483][ATTACH=JSON]{"data-align":"none","data-size":"thumb","data-attachmentid":3302424}[/ATTACH][/URL]...Leave a comment:
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I don't think I see that [B]'DRAMRST#'[/B] voltage name in the [B]EC voltages list. [/B]I'll leave the [B]voltages# [/B]here just in case it goes with another name. If not, it may be hidden under the [B]'N83339956' [/B]stuff but I could track where it might be with some hints.
AC_IN_OC#
BAT1_IN_OC#
BUF_PLT_RST#
CAP_LED#
CHG_FULL_LED#
CHG_LED#
CVT_SNSR#
DGPU_PWR_EN#_EC
DGPU_RST#_EC
EC_RST#
EC_SCE#_PCH
EXT_SCI#
EXT_SMI#_X1
FN_LED#
IMVP8_VRHOT#
LCD_BACKOFF#
LID_SW#
LPC_FRAME#
MIPI_RESET#...Leave a comment:
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Hi. Sorry for being late. I usually attack the problems with the suggestions quick enough but I was sick. I know it because the laptop keyboard has a led on [B]CAPSLOCK [/B]key and is not blinking at the beginning nor when I press it after some seconds. USB keyboard key lights turn on but the [B]CAPS/NUMLOCK [/B]are off and irresponsive.
Indeed the board is [B]NOT DOING POST[/B].
Gotta say that board comes in right after [B]AC.[/B][B]Adapter [/B]is plugged in, probably because the battery is not connected. After pressing the [B]ON/OFF [/B]button on the keyboard for some...Leave a comment:
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[B]COIL[/B] = VOLTAGES (adapter powered) = IMPEDANCE TO GND (off and unplugged)
[B]+VCCGT[/B] = 0V = 5 ohm
[B]+VCCSA[/B] = 1.0V = 19.5 ohm
[B]+VCCCORE1[/B] = 0.84V = 3.5 ohm
[B]+VCCCORE2[/B] = 0.84V = 3.5 ohm
[B]+1.05VSUS[/B] = 1.1V = 53 ohm
[B]+1.2V [/B]= 1.2V = High-fast fluctuations (weird)?
[B]+1.8VSUS [/B]= 1.8V = 26.6K ohm
[B]+3VA_DSW [/B]= 3.3V = 31.5K ohm
[B]+5VSUS [/B]= 5.1V = 20.6K ohm
[B]P_CHG_RSENS_SHAPE[/B] = 0.28v = 500k ohm
[B]+1.35VSG [/B]= NC = NC
[B]+1.2V...Leave a comment:
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I think I misplaced couple components because of the similar model boardview I was using. I'll update everything and post it. Brb!Leave a comment:
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mon2[USER="295753"]mon2[/USER] Oh, thanks a lot. I'll be right on it. Sorry if I ask much mon2, but could u gift me a brief 20-word description about [B]+5VSUS? [/B]Kinda struggling to get it right. What powers, when, for what, etc. Please.
Or if u know a guide or book, appreciLeave a comment:
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Needed exactly this one. Thanks for the contribution!!Leave a comment:
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I still don't know what the [B]+5VSUS [/B]is and how does it work. Is it an important early value for board to go on? I thought it was something like [B]SUS[/B]pended. So it came in after board was hybernating or something.I still don't know what the [B]+5VSUS [/B]is and how does it work. Is it an important early value for board to go on? I thought it was something like [B]SUS[/B]pended. So it came in after board was hybernating or something.I still don't know what the [B]+5VSUS [/B]is and how does it work. Is it an important early value for board to go on? I thought it was something like [B]SUS[/B]pended.Leave a comment:
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PUMP!
Hi. Anyone got hands on the UX334FL (UX334FAC) Rev2.0 Schematic/Boardview?Leave a comment:
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nikolayu[USER="343095"]nikolayu[/USER] Hi good sir. Nope, doesn't seem to be giving HDMI...Leave a comment:
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piernov[USER="169897"]piernov[/USER] Ohh, I didn't get before why people was so pesimistic about this. Crystal clear now.
Very interesting stuff! Thanks a lot for the insight, piernov. I'm digging more about it.
Thanks to everyone who contributed...Leave a comment:
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ASUS Zenbook UX334FAC (UX334FL REV2.0) - No Display. Fell off the table.
Hi again!
-Laptop fell from the table.
-Motherboard -seems- intact.
-It turns on kinda normal but [B]NO DISPLAY, NO BACKLIGHT[/B].
I'm not too familiar with [B]ASUS[/B] laptops yet. I[B]'m using a similar laptop model Boardview. (UX333FN REV2.0)[/B]
I feel there might be something wrong with these coil impedance values yet the voltage values go normal.
[B]COIL[/B] = VOLTAGES (adapter powered) = IMPEDANCE TO GND (off and unplugged)
[B]+VCCSA[/B] = 1.0V = 22ohm
[B]+VCCCORE1[/B] = 0.8V = 3.5ohm
[B]+VCCCORE2[/B]... -
Thanks for insights. I did the reflow on the 2001 GPU chipset since customer wanted to try. You guys were right, it came back to life but went off again. What does the reflow do exactly in that case? 'Repair' the structure within the chip and make it work or is it something with the BGA solder? Now I'm shipping in the stencil because customer wants me to try reballing since she saw it work and plus got nothing to lose and I can practice manual reballing.
What do you guys think?Leave a comment:
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