To ask here... I have few devices with white screen problem, actualy nokia 2220 and some fuji? camera, and try to understand what is common problem to cause that issue.
Yes, both devices work everything else probably ok, I mean, I hear intro melody and keypress click sound, DTMF tone, power on off... all ok.
On desk is nokia 2220 slide, and I check all screen connectors and components arround it, measure voltage drop, but all looks ok. I suspect on slide flex cable, but it look ok and white screen is not interupt while flexing board, pushing conectors, and sliding up down. In attachment...
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by harp05-13-2024, 03:43 AM
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by sauceHi,
I bought a faulty A2289 for myself.
The USB-C meter was stuck on 5V.
After remove the board the U3100 was corroded and also around but quite light.
So I clean the U3100 and see R2834 in bad condition and its value was not good.
I replace it and not the USB-C meter shows 20V, the fan is spinning, CPU is hot but nothing else no picture.
The USB-C meters shows a very low current with all connected. It starts at 20v few mA and then stays at 20v 100mA.
How mush current the board is supposed to take without nothing...05-19-2024, 12:20 AM -
by ChrissygizmoHi all, I've recently replaced the screen on my samsung galaxy a02s mobile phone, it was working spot on before I cracked the screen . Now however it won't turn on, all I get in the screen is the charging symbol as in the picture I've uploaded, it just stays like so , there's no green ring to show it is charging, I originally thought I had damaged the battery whilst stripping it but I've got a new battery & it's exactly the same...Today, 06:25 PM
-
by johnbetonHello,
I have a A1706 with 820-00923-A board. The laptop came in with non-working keyboard. I bought a new top-cover with keyboard and transfered everything to the new topcover.
Since then the macbook will not charge or power-up. Before replacing top cover, I started the macbook to test, and it worked fine apart from keyboard. Then shut it down and did replacement.
This is what I measure so far:
Resistance from F7000 to ground is 123 Ohm on pin 1 and 2
PPBUS_G3H = 0,79v
PPBUS_HS_CPU = 0,79v
PPBUS_HS_OTH5V = 0,79v
PPBUS_HS_OTH3V3...Today, 02:06 PM -
by Olles4Hello people. I trying to repair my welding machine oerlikon citomig 180mp hpf and there is a little board with blown stuff.The problem is i cant identify the value of the blown resistor and diode. Any suggestion?4 Photos05-18-2024, 01:22 PM
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by RoliHello , the laptop turns on , but only black screen .
Model NR : S532FL
Serial : K8N0CX109826344
CPU : I7 8th Gen
Thankyou !-
Channel: BIOS Requests ONLY!
Today, 04:24 PM -
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by vinceroger69Hi guys any good tips on how too remove scratches on lcd screens i have two sets with a couple of scratches on the lcds and would like too try and remove them as makes re sale easier many thanks...05-16-2024, 07:31 AM
-
by fredyjbiPlease help sir, this board does not turn on because VSYS_OUT is 9.2v, I compared it with a normal board VSYS_OUT is 10.2v, I have replaced the PQ101 and PQ102 mosfet and BQ 25700 which is known to be good, but the results are still the same, thank you
VSYS_OUT 9.2v
Meter in resistance mode auto range 6M ohm ok
NORMAL BOARD VSYS_OUT 10.2V
[COLOR=#8e44ad][B]LINK to schematic[/B][/COLOR] -> [url]https://www.badcaps.net/forum/troubleshooting-hardware-devices-and-electronics-theory/troubleshooting-laptops-tablets-and-mobile-devices/schematic-requests-only/77167-required-t480-nm-b501-schematic[/url]...05-06-2024, 10:48 AM -
by jm1234Hi,
I'm troubleshooting a power supply board and one opto coupler seems shorted. It's a through-hole, marked with 3 lines:
1223
816A4
W
I'm not sure what replacement to buy for it. It resembles LTV-816 ([url]https://www.tme.eu/sk/en/details/ltv-816/optocouplers-analog-output/liteon/[/url]), but I'm not sure it's 100% that. The data sheet shows multiple sub-types like 816M, 816S, but 816A is not there.
I do have other functional pieces on the same board, so I could do some measurements on those, but I'm not sure what to check.
Any idea appreciated.Hi,...Yesterday, 03:30 AM
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by johnbetonHello,
I have a A1706 with 820-00923-A board. The laptop came in with non-working keyboard. I bought a new top-cover with keyboard and transfered everything to the new topcover.
Since then the macbook will not charge or power-up. Before replacing top cover, I started the macbook to test, and it worked fine apart from keyboard. Then shut it down and did replacement.
This is what I measure so far:
Resistance from F7000 to ground is 123 Ohm on pin 1 and 2
PPBUS_G3H = 0,79v
PPBUS_HS_CPU = 0,79v
PPBUS_HS_OTH5V = 0,79v
PPBUS_HS_OTH3V3...Today, 02:06 PM -
by ChrissygizmoHi all, I've recently replaced the screen on my samsung galaxy a02s mobile phone, it was working spot on before I cracked the screen . Now however it won't turn on, all I get in the screen is the charging symbol as in the picture I've uploaded, it just stays like so , there's no green ring to show it is charging, I originally thought I had damaged the battery whilst stripping it but I've got a new battery & it's exactly the same...Today, 06:25 PM
-
by RoliHello , the laptop turns on , but only black screen .
Model NR : S532FL
Serial : K8N0CX109826344
CPU : I7 8th Gen
Thankyou !-
Channel: BIOS Requests ONLY!
Today, 04:24 PM -
-
by ianbakHi,
I have an HP 255 G8 that runs for as long as its battery holds charge but won't accept AC power.
I have partially diagnosed the problem and the issue seems to be that there is no ACDRV output from the BQ24735 to turn on the two input MOSFETs. The 24735 has a VCC of 19.57 V, the ACDET input is at 2.93 V and the REGN 6V LDO is outputting 5.98 V, so everything looks good - but ACDRV is stuck at 28 mV.
I've already replaced the 24735 and both input MOSFETs and nothing has changed.
I'd appreciate some suiggestions as to what to try next.Yesterday, 08:45 AM -
by mrkmpnLenovo X1 Carbon 7th Gen Type 20R1
SN: PF1Y5BBJ
Board: GX490 NM-C661 Rev: 1.0
I have made two dumps of this bios, with the bios chip removed from the board and the hashes match on both dumps, but I cannot find the DMI information in the dumps except for the Windows product key, so I think it is corrupted. I have downloaded two bios updates from the Lenovo support site, but they contain small .PAT file, and 4 subfolders containing .FL1 and .FL2 files, which I don't understand enough to figure out how to use to fix my dump.
The problem with the laptop is that...-
Channel: BIOS Requests ONLY!
Today, 09:14 AM -
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by chumatezPLEASE I need help on HP Stream Laptop 11-ak0040nr BIOS BIN FILE.
motherboard model is DAY0QMB16A0 REV:A.
i attached the old one below...-
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Today, 05:10 AM -
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by matheus30When I took it out it broke, and I want to get the same one or one of good quality.
Where can I buy it? On AliExpress they do not indicate the maximum amperages, and on Mouser or TME.EU it is impossible to search without having the exact reference.
Inductor needed:
It is the PP5V_G3S Coil of an A2159, 820-01598 (L7670)
On the front it says: 1R5
and in the schematic:
1.5UH - 20% - 12.5A - 0.017Ohm
PIMB062D-SM
152S00268
Can someone tell me where to buy it?
Thank you so much.Yesterday, 11:44 AM -
by ScarfycakeHi all,
I sent my [B]ProArt Studiobook 16 OLED (H7600, 12th Gen Intel) [/B]to the local repair guys to have a very simple DC in port replaced. I sourced the part myself on accessoires-asus (french company) after struggling to find the right part in the UK. It looked completely the same to the installed part from what I can tell. Originally the only issue with the laptop was a bad / loose DC connection, and so the computer and battery acted completely normal aside from a very poor connection that would fail at certain angles. After the repair was completed I brought it home and used...5 PhotosToday, 08:16 AM -
by SACRHallo, can someone help me to unlock this Acer Aspire E1-472G. Thank you
Unlock Key Hint Number : 7EC6184C-
Channel: BIOS Requests ONLY!
Today, 03:42 AM -
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by Olles4Hello people. I trying to repair my welding machine oerlikon citomig 180mp hpf and there is a little board with blown stuff.The problem is i cant identify the value of the blown resistor and diode. Any suggestion?4 Photos05-18-2024, 01:22 PM