Backlight issue. What am I doing wrong?

[DoOm86]

TV philips 55'' no backlight (image ok).
I tested the backlight with my led tester from the unplugged connector cable and it lights up. I had voltages at the motherboard connector, but anyway I order a new psu. Same problem, same voltages. Disassembled the TV and checked every strip with my led tester, they all light up, same voltage for every pair of strip (they go two by two).
What am I missing?

And something else I don't understand. I checked and I have 3v Leds, 10 per strips. Why every pair of strip (so 20 Led) take about 32v when powered up with my led tester 🤔

[trepachka]

See attached image. It says "X322" on it. This is a follow-up to my previous posted topic. The issue is upon lid closing, the screen turns off. When lid is opened, the screen remains dark.

This component is positioned right on the edge of the motherboard and has like a cradle made inside the case. I am assuming this component is used as a lid close sensor.

Please, help me identify it. Thank you....

[mferna14]

Hi., I am working on this motherboard MB:marshmallow mb 15257-2n 448.07N06 . 002N ... The required voltages (3.3v, 5V) are ok but the pressing the ON/OFF button does not turn on the laptop. I just noticed that someone messed up with the BIOS. Anyway I was able to read the BIOS, uploaded it. Kindly if some can re-build the BIN files, Model Hp ENVY x360 15-aq100nx , Serial # 8CG710266V, thanks in advance....

[Tjaytony]

I have acer c733 series chromebook with enterprise lock.

model; C733-C962

SN; NXH8WAA00303812EFE7611

Board serial no; ZAK DA0ZAKMB6JO REV J

i have tried RC Unlocker which some times works for, but it didnt work for this chromebook. Could anyone help me unlock it. thanks....

[guizmo1967]

Hello,

My Asus monitor stop working today !! I found the problem on the main board, the power supply board is ok. It's Q9, a mosfet but I have no idea what are the specs since I don't have the schematic for that monitor !!

Can someone help me identified this mosfet ?

Thank you !

[rascao]

HI i have a MSI [B]Katana GF66 11UC-045XES[/B], when i get it was turning on only for 1 seg and then off no display nothing, i download the bios from the MSI webpage and flash it with he SPI flasher, now on pressing the power button it turn on and stay on but no IMAGE, what i see when i create another dump from the new bios flashed i get a error on ME analyzer says "Warning: Data in Engine/Graphics region padding, possible data corruption!" after try to boot the laptop with the new bios clean downloaded from MSI, i try to clean the ME region but no luck i dont know how to doit on this...

[mikkele86]

Hello Im renovation a Luxman R-5045

On the attached picture there is a cap 0.047uF (47nF) and a resistor, 10ohm. What is their purpose ? and what would happend if I were to replace the caps with lets say, 10nF or 100nF ?
because thats what i got in stock :/

[ATTACH=JSON]{"data-align":"none","data-size":"custom","height":"566","title":"0,047 uF.jpg","width":"829","data-attachmentid":3253926}[/ATTACH]Hello Im renovation a Luxman R-5045

On the...

[dd10]

Hi, I need bios XFX RX-470P85 VC.0 hynix memory (red fan version). Bios found on TechPowerUp are for other versions (black fan) and displays error code 43

[wolba123]

Hello, I need the circuit diagram and the Boardview view.
The exact designation is as follows: Stradale CMLH 18835-1
C31KJSJA
Can anyone help me with this?

[Ross Kohler]

Hi,

I'm learning about motherboard repair and I believe I've traced the issue down for the South Bridge on the particular motherboard I'm working on. My path of concluding that:
- There's no sign of any attempt to power on when pushing the power button.
- No PSON signal is reaching the 24-pin ATX connector.
- The Super IO chip is receiving the PS_SWITCH signal from the power button and is relaying this signal back to the South Bridge.
- The Super IO is not receiving the S_SLPS#_R signal back from the South Bridge
- If I pull the Super IO S_SLPS#_R pin...

[startrek]

Hi I'm looking for working bios and ec for HP ProBook 455 G9, motherboard [I]DAX9SFMB8A0 REV:A[/I]Hi I'm looking for working bios and ec for HP ProBook 455 G9, motherboard [I]DAX9SFMB8A0 REV:A[/I]Hi I'm looking for working bios and ec for HP ProBook 455 G9, motherboard [I]DAX9SFMB8A0 REV:A[/I]

[fredyjbi]

Please help friends, thinkpad t480 nm-b501 is dead, help me fix it, thank you
usb meter 20v 0.00 amp, after I took the VSYS measurement the drop was only `9.2v which should have been 10.2v I measured from a normal matherboard machine, the VSYS path resistance to ground diode mode is 1900 thank you

[B]LINK to Schematic[/B] -> [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]Please help friends, thinkpad t480 nm-b501...

[digitelos]

Hello everyone!

I have a HP 14-dv0058nf;
S/N. 5CD1290M9P

Motherboard: DA0G7GMB8F0 REV.F

The laptop turns on and the power light also turns on. I think the problem is the BIOS

Can anyone get the correct bios so I can test?
Old Bios attached

Thanks!...

[monitron]

I am working on a HP Pavilion 27-d0010nd that has dark screen. It appears that the backlight is not working.
Now i discovered that the backlight circuit is on the scalar board and has a burnt mosfet. (caused by a ceramic capacitor short).

If anybody can help me identify the partnumber it would be a very great help.

The board number is:

L76838-001
L99794-001
BigBen Scalar board.



[ATTACH=JSON]{"data-align":"none","data-size":"medium","data-attachmentid":3253797}[...

[Prott]

Hello, my apologies for reviving this thread. I have a 8gen NUC with a (possibly?) dead bios - the fan starts up, slows down, but it doesn't show any picture (recovery button doesn't work either). The dump is attached.

Could anybody please help me with fixing it? I am not able to find any BIOS dumps for this model anywhere.
[B]S/N:[/B] BTDN9320085T
[B]Model: [/B]BLKNUC7i7DNKE

Thank you so much! Hello, my apologies for reviving this thread. I have a 8gen NUC with a (possibly?) dead bios - the fan starts up, slows down, but it doesn't show any picture (recovery...

[jaroslav.psenicka]

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)

[gogunet]

LENOVO LEGION 5 PRO 16ITH6H
S/N PF2RCD7F
MTM 82JD000WRM

The laptop won't start. It reads the power button, keyboard lights up, it charges, but no display.
Need a working bios.


Thanks!

[admac]

hi,
someone have bios for lenovo m80q tiny 11DQ?
please help

[SkullMurray]

Hi all, I' m a newbie in troubleshooting but I'd like to solve a quarter fan spin issue on a 820-5509-A board. Where should I start to solve this problem? Any suggestion is useful! Thank you!

[pavithra]

I have 50 Chinese constant current isolated LED drivers based on LC6685 IC. 35 drivers are working fine, but there is a slight flickering in the rest of the drivers.
I have checked the output with oscilloscope and found that there is a slight random voltage fluctuation.
Is it possible to get the datasheet of LC6685 IC?
Also highly appreciate if you could let me know what could go wrong....

[Patriarxis]

Hello.

I have a LENOVO V15-ADA that it not turning on.

The motherboard that it has is GV451&GV551 NM-D151

When i connect the power it takes 550mA and it has black screen. The power button is on and it works fine.

I have make the basic mesurments on the mobo and i dont have any short circuit.

I have reprogramme the bios but nothing .

Any ideas?

[_Margo_]

Hello friends.
I need bios on Thunderobot 911x (or Hasee s8d6) DANLXBMB8C0 REV: C NLXB
Thanks

[LightMad]

Hi everyone!
need [B]Surface Go 2 1901 Bios DAV81MB1AE0 REV E[/B]
dump . Thanks!Hi everyone!
need [B]Surface Go 2 1901 Bios DAV81MB1AE0 REV E[/B]
dump . Thanks!Hi everyone!
need [B]Surface Go 2 1901 Bios DAV81MB1AE0 REV E[/B]
dump . Thanks!

[Jackching]

I know for sure it has a bad cap and one cold solder joint. Just wondering before i order the Caps if anyone has any experience with this model? Just making sure there isnt a common component that goes bad besides the caps....

[itsmaserati]

Hello all, seeing if someone can help me and remove the Dell security manager password.
Thank you in advance!

Dell Inspiron 15 5510
ST: F8Z24B3...

[BMCappelletti]

Hi everyone.
Macbook Air A1466 EMC 3178 (board 820-00165 A) not turning on and no charging light. Completely dead. With no battery connected it would power up and I could hear the chime, but nothing on the screen and then a sudden turn off. Sometimes during the chime. Opened it up and found some liquid damage. The flat that connects both boards has damage in one side (with a missing pin already). The connectors on the boards are fine, though.
Also, there was liquid damage on the included picture area, which are R8111 and C8111. A quick and soft brush on it made the resistor be gone....

[shlomim412]

Hello
working on a2141 macbook, board number 820-01700 which has no wifi\bt and also no connection with LAN cable.

initial visual inspection the board looks good no visible corrosion or damage.

i found that PP3V3_G3S_X is shorted to ground (around 1.5ohm short)
and also PP3V3_GS3_WLAN i shorted to ground (same ohm reading, around 1.5ohm).

the board is working but no WIFI\BT as i mentioned.

with the usb c cable connected for measurement i noticed U8215 i getting EXTREMELY HOT
so i pulled it out figuring it might be causing the...

[arecki09]

Hi!
Model: Lenovo L14 gen 2
CPU: SRK04 i5-1135G7
Board: HL4A0/HL5A0 Rev. 1.0

Laptop no boot, no react on power button. Power supply switch on 20V but consume only 0,11A. Electric i cannot found problem.
Probably problem with bios
Original bios in att.
Please help!...

[Carl0s-]

Hi,

Sooo - our IT got a pile of old iPads that the sales guys have been mistreating. These are free for grabs if you want to try to get one working. Thought I'd give it a try - if I get at least some life to I can give to my kid to entertain during a car rides.

But the iPad it self - its a 5th gen cellular model. When I initially plug it in it was completely dead. It was not recognized by my Mac nor it started to charge. Disassembled it opened up the battery connector and checked the battery voltage. My multimeter showed 0,7v. Had a spare micro-usb charging board lying...

[rumpumpel1]

Hi,

a few weeks ago I saw offers for a MEC1503 on aliexpress. Out of curiosity, I bought one and was a bit surprised when the chip arrived: as you can see in the picture, it was significantly smaller than the original in my ThinkPad. Does this chip really exist in 2 sizes or is it just a fake?

[ATTACH=JSON]{"data-align":"none","data-size":"full","title":"grafik.png","data-attachmentid":3253284}[/ATTACH]Hi,

a few weeks ago I saw offers for a MEC1503 on aliexpress. Out of curiosity, I bought...

[cap__]

"I heard that a blue LED has different voltage values than green and red ones. Green and red ones are easily replaceable, but how do I do that with the blue one?"

"I have to use the blue one, because green means fully charged and blue means charging."





[ATTACH=JSON]{"data-align":"none","data-size":"full","title":"20240415_172809.jpg","data-attachmentid":3253246}[/ATTACH]...

[Talyn]

Hi,
My Sony W905 started to turn itself off an on every few minutes and blinking 8 times red in standby. A few minutes later the tv was completely dead.
I can only hear the click of the PSU when attaching/detaching the power cable. No standby LED.

Any advice? Thanks!

[ProStypek]

Device: XBOX ONE S

Model: 1681

Motherboard: X947889-002

Problem: element identification - damaged resistor

Hello. I need to find resistor value R4T15. I show it on picture. ...

[EazyBone]

Got this massive TV and tested they backlights and they were out. Took it all apart and replaced them. Put it back together and boom they work! I then run it for many hours and all still working. I then needed to factory reset to pass on to next person and...

I factory reset and it shows Hisense logo fully lit up, then Google logo for a couple of seconds and forces shut off. Now that's all the TV does. Hisense, Google logo force shutoff. How is this possible.. anyone have some experience or advice for this. All I can think is somehow I got a software corruption which is ridiculous...

[PACKETSTORM2]

Hi

Need ec dump for Asus U31JG rev 2.0 or U31F rev 2.0, Thanks

[kenanddkc]

Hi everyone, need help with locked bios.

IdeaPad Slim 3 14AMN8 - Type 82XN
Serial: PF4AGAZB
Machine Type: 82XNCTO1WW
MO: PF6XB3514134
MB Lenovo, PN: 5B21K59349
Date: 2023-05-16
Country: Italy
Chipset: AMD

Thanks....

[Deong]

First of all, I'm sorry for my lack of English.
The part I found the problem in the picture below is no2.
When I check with the bell tester, there is a short circuit. And I checked the bell tester on the no1. The no1 is open on both sides, and the numbers keep increasing.

In my opinion, the capacitor of no2 is the problem, is it correct?[ATTACH=JSON]{"data-align":"none","data-size":"full","title":"KakaoTalk_20240415_190143837.jpg","data-attachmentid":3253096}[/ATTACH]First of all, I'm sorry for my lack...

[didouche1200]

need shematic for lenovo thinkpad gp540/gp740 nm-c651 rev 1.0 thanks

[spendary]

Dears
i need help to remove bios password for surface go...

[mily.gawel]

Hi, Can someone somehow clear the mebx password from my batch or write me a new bios ? Lenovo M90t I4X0MS_P rev. 1.0 s/n EM00C736...

[jonny0404]

....

[jonny0404]

hi guys i have these board that doesnt get any video, it doesnt beep, i replace memory ram and i have 2 cpus one is aTLON3000G AND THE other one is rizen 1600, i try both i flash bios, on memory module i have vdp spd 3v i have voltage 1.2v the only voltage that i dont see is MB_RST pin 58 on memory , can some one tell me where else i can measure i have the boardview here ..

[url]https://www.badcaps.net/forum/troubleshooting-hardware-devices-and-electronics-theory/troubleshooting-desktop-motherboards-graphics-cards-and-pc-peripherals/bios-schematic-requests/3253075-b450m-pro-vdh-p...

[sam_sam_sam]

I have a 24 volt version of the same type of switching power supply but that one I am relocating to meter module and I might do the same thing with this one but I have to modify an enclosure that is not made for this type of switching power supply in fact I am not sure exactly what type of switching power supply it actually fits because none of one's that I have the screws holes do not line up and not even close but the switching power supply fits in the enclosure

So I have take out the switching power supply board out of its enclosure and drill the hole so that it can be mounted...

[trepachka]

Hello, I have this HP Spectre 14-ea0023dx (wrong model number in the title) laptop with an issue. When you close the lid, the screen goes off. Then, when you open the lid the screen remains dark while the computer is still running.

I suspect the issue is with the lid sensor which I am assuming is a small magnet located in the lower part behind the screen bezel.

Could someone, please confirm this? Thanks.

[Antonynl]

I have a tantalum capacitors with indicators EB 21 that measures only 22pF. See attached picture.

Since this is a windmeter that is normally in a very high mast I would like to get the correct replacement capacitor.

Is there somebody that can tell me what the capacitance and voltage of this capacitor are?

I don't feel confident that I can figure this out myself after searching around

Cheers!!

[jm1234]

Hi,
I'm looking at the power source module of my Panasonic plasma TV TX-P42ST50. The TV goes into suspended state almost immediately and keeps flashing 6 times.
That zener diode is marked on the board with the diode sign (D204), that much I know. It seems to be open completely in both directions and its legs seem dark, as if it suffered some heat.
I'm having trouble finding a replacement. Does 21 stand for 21V?
The only other clue I have it is connected across 2 of the legs of a transformer (primary side).
Any idea how to find a replacement?
Thanks
[URL=filedata/fetch?id=3252836&d=1713119993][ATTACH=JSON]{"alt":"Click...

[koby058]

Hi Gentlemens,

Can any one please help identify this mosfet (power supply of CPU) from asus gaming laptop ? (ALA49EX)

one picture to show how it looks from bottom...

[bigboots]

Not sure if this is the correct place. I need to identify This IC id anyone could help please.

Kind Regards....

[wolf1976]

hi to all in this tv i have problem with the colours you can see on the video from normal changed to purple
is like solarized picture on your opinion and caused from gamma ic or is display?
thanks on advance...

[classicandy]

Hi Everyone,

Please, I have a MacBook Pro A2338 M2, board number : 820-02773. The speakers and the microphone of the Mac are not working and I need assistance in fixing.

UR730 got damaged and short-circuited the motherboard. After removing the shortened IC; before and after putting the new one I ordered, the speakers [specifically the other one not affected by this IC] and the microphone are still not working. I do have sound through a Bluetooth speaker device or when I connect a headphone with microphone to the jack 3.5mm input. Also, media files do not play unless a...

[ProStypek]

Device: Laptop
Brand: Medion
Model: Erazer P7643 (MD99496) MSN30019516
Board number: D17S REV 2.0
Serial number : 15APE5024705
Request: BIOS UNLOCK
CPU: SR2EZ i7-6500U
GPU: N16P-GT-A2

Hello. I need remove bios password. Can someone help?
...

[sopik78]

Hello, I have an issue with the backlight on my [B]HP 250 G8[/B] laptop. Here are the voltage readings:[LIST][*][B]INVPWR_B+[/B]: 19V[*][B]+LCD VDD[/B]: 3.3V[*][B]INVTPWM[/B]: 3.3V[*]It does not have a touchscreen.[/LIST]
Could someone advise me on what else to measure? I've already tested two different LCD panels.



[ATTACH=JSON]{"data-align":"none","data-size":"full","title":"image.png","data-attachmentid":3252811}[/ATTACH]Hello, I have an issue with the backlight on my [B]HP 250 G8[/B] laptop....

[Santana26]

Please I want the BIOS file HP / Compaq ASUS P5LP-LE Leonite-GL8E Lithium Intel Socket 775 DDR2

[COOLISCOOL123]

Need Admin Password for Dell/Alienware M15 R3. J7KC433 is the service tag.

Grateful for any help.

[GraphicMan]

The monitor is old yes but occasionally used (perhaps about 1 ~2 hours usage per day on average)
one time i turned the pc on and noticed this issue
what could it be?
nothing wrong is seen when it is off, also the issue is not there on a green screen!
when watching movies it is hard to detect unless in black screen/large shadows
please check the images, thanks...

[Astray]

Hello, working on a laptop (MSI GS75 9SG-242US, Core i7-9750H, 2080 Max Q) and after replacing the screen and forgetting to disconnect the battery prior, I have no visible indications of power anywhere. It was working perfectly fine prior to the screen removal and replacement. Checked the motherboard PCB visually near the LCD connectors and didn't really see any indications of damaged surface mounted components but haven't looked under a microscope yet.

Battery charging light isn't turning on when plugged in and pressing the button does nothing regardless of being on battery power...

[timeless]

Hi,

I've been troubleshooting a Dell U2518 that produces no picture yet the backlight is turned on, the PSU produces 19v, It is detected over HDM and its firmware could be upgraded over USB. So to me the controller board and PSU seems ([I]somewhat[/I]) functional.

There is however a ticking noise from the T-Con board to the left side of the RT6811 chip when power on ([I]not when off[/I]). Also the RT6811 chip gets quite hot ([I]cannot be touched for long[/I]) otherwise there is no physical sign of damage and everything around the board is neatly covered with plastics...

[roixijram]

Find a dump for this type or fix this
matherboard : LA-K971P REV:1a...

[Gecko-EC]

Hi Guys, I hope someone can assist me me. I have a HP Probook G2. It came in for not charging. When charger plugged in power light on the charge port was flickering as well as the caps lock light. Not a pattern, but inconsistent. I found a faulty mosfet on the power input which I replaced. Problem I have is that it does not start up without a battery unless I use a 18.5v charger. It does however start with the 19.5v with the battery installed, but the battery charge voltage is 2.58v. The required charger for this unit is a 19.5v of which I have tried several. The battery is bad and have ordered...