-
-
Re: 42inch Touch Screen wont power on
Have you tested the voltages out of that connector?Please do not PM me with questions! Questions via PM will not be answered. Post on the forums instead!
For service manual, schematic, boardview (board view), datasheet, cad - use our search.Comment
-
-
Please do not PM me with questions! Questions via PM will not be answered. Post on the forums instead!
For service manual, schematic, boardview (board view), datasheet, cad - use our search.Comment
-
Re: 42inch Touch Screen wont power on
Okay and if that checks out whats my next step so i can do more then one thing?Comment
-
Re: 42inch Touch Screen wont power on
I think a better question/suggestion is
Have you retested the voltage at the connector with the replacement diode? It is a reasonable suggestion since one component has been changed and could produce new results?
If it was the same component reused or reinstalled, then I could see no point in retesting.Last edited by retiredcaps; 12-12-2011, 04:07 PM.--- begin sig file ---
If you are new to this forum, we can help a lot more if you please post clear focused pictures (max resolution 2000x2000 and 2MB) of your boards using the manage attachments button so they are hosted here. Information and picture clarity compositions should look like this post.
We respectfully ask that you make some time and effort to read some of the guides available for basic troubleshooting. After you have read through them, then ask clarification questions or report your findings.
Please do not post inline and offsite as they slow down the loading of pages.
--- end sig file ---Comment
-
Please do not PM me with questions! Questions via PM will not be answered. Post on the forums instead!
For service manual, schematic, boardview (board view), datasheet, cad - use our search.Comment
-
Re: 42inch Touch Screen wont power on
Hey all sorry back from holidays and still on them so have some decent time to do testing.
All voltages tested the same as they did before from the power points so guessing the diode wasnt the problem.
Marked as diagram
(1)
1-2 .243
2-1 ol
2-3 ol
3-2 .244
3-1 ol
1-3 ol
(2)
1-2 .196
2-1 ol
2-3 ol
3-2 .196
3-1 ol
1-3 ol
(3)
1-2 .196
2-1 ol
2-3 ol
3-2 .196
3-1 ol
1-3 ol
(4)
1-2 .193
2-1 ol
2-3 ol
3-2 .193
3-1 ol
1-3 ol
(5)
1-2 .193
2-1 ol
2-3 ol
3-2 .193
3-1 ol
1-3 ol
(6)
1-2 .195
2-1 ol
2-3 ol
3-2 .195
3-1 ol
1-3 ol
RetestedAttached FilesComment
-
-
Re: 42inch Touch Screen wont power on
A) One still unanswered question from post #25.
1) See if pin 12 (vcc) is shorted to pin 10 (gnd). Any resistance reading less than 30 ohms suggests it is bad. If yes, I believe that indicates L659 is bad.
====
B) With the new diode in now, redo tests 3 and 4 in post #25.
====
New test.
c) On the biggest yellow transformer (the one above the Powerview logo), there are 17 pins on that transformer.
Number them however you like, but upload a picture with your numbering scheme so we know what it looks like. With power off and lcd unplugged measure the resistance and report all readings for the following pin combinations.
1-2, 1-3, 1-4, etc, etc, 1-16, 1-17
2-3, 2-4, etc, etc 2-17
3-4, 3-5, etc, etc, 3-17
etc
etc
14-15, 14-16, 14-17
15-16, 15-17,
finally
16-17
We are testing every possible pin combination with the above.
If possible, put it into a spreadsheet and export it as a PDF file so it is in a nice grid and we can read everything.
What we are looking for here is something obvious like an open winding when it shouldn't be. From the backside, you can tell which pins are supposed to have a low ohms reading (like 0.3).--- begin sig file ---
If you are new to this forum, we can help a lot more if you please post clear focused pictures (max resolution 2000x2000 and 2MB) of your boards using the manage attachments button so they are hosted here. Information and picture clarity compositions should look like this post.
We respectfully ask that you make some time and effort to read some of the guides available for basic troubleshooting. After you have read through them, then ask clarification questions or report your findings.
Please do not post inline and offsite as they slow down the loading of pages.
--- end sig file ---Comment
-
Re: 42inch Touch Screen wont power on
It is not uncommon to have more than 1 problem especially if the TV was subject to a power surge.
In the computer lcd world, some Benq boards have multiple problems. Bad caps, bad solder joints, open fuses, bad mosfets and bad transistors ALL can show up in one monitor. I know because I have fixed 5 or 6 of them.--- begin sig file ---
If you are new to this forum, we can help a lot more if you please post clear focused pictures (max resolution 2000x2000 and 2MB) of your boards using the manage attachments button so they are hosted here. Information and picture clarity compositions should look like this post.
We respectfully ask that you make some time and effort to read some of the guides available for basic troubleshooting. After you have read through them, then ask clarification questions or report your findings.
Please do not post inline and offsite as they slow down the loading of pages.
--- end sig file ---Comment
-
Re: 42inch Touch Screen wont power on
Okay i just pulled everything off the board.
I will test both the transformers, i am testing the bridge rec out of circut.
I pulled the IC off on the small Heatsinc it is DH18 B DM0465R
can i do test 25# out of circut ? it tested okay last time sorry i thought i posted that.Comment
-
Re: 42inch Touch Screen wont power on
resultrs from transformer 1 (large one)Comment
-
Re: 42inch Touch Screen wont power on
Check your pdf file. The formatting is all screwed up? I can't find 1-2, 1-3, etc.
If you can't get it looking correctly in the pdf, then post your xls file.--- begin sig file ---
If you are new to this forum, we can help a lot more if you please post clear focused pictures (max resolution 2000x2000 and 2MB) of your boards using the manage attachments button so they are hosted here. Information and picture clarity compositions should look like this post.
We respectfully ask that you make some time and effort to read some of the guides available for basic troubleshooting. After you have read through them, then ask clarification questions or report your findings.
Please do not post inline and offsite as they slow down the loading of pages.
--- end sig file ---Comment
-
Re: 42inch Touch Screen wont power on
1) Datasheet is at
This is a FET/SMPS. Refer to figure 3 for the pinouts.
2) Pin 3 is Vcc and pin 2 is GND. Measure the resistance between these 2 pins. Report the reading.
3) According to the datasheet, when Vcc reaches 12 V DC, it starts working. After we tell you to reinstall everything, check Vcc to see if it gets to 12V DC.
4) Page 13 has a schematic.--- begin sig file ---
If you are new to this forum, we can help a lot more if you please post clear focused pictures (max resolution 2000x2000 and 2MB) of your boards using the manage attachments button so they are hosted here. Information and picture clarity compositions should look like this post.
We respectfully ask that you make some time and effort to read some of the guides available for basic troubleshooting. After you have read through them, then ask clarification questions or report your findings.
Please do not post inline and offsite as they slow down the loading of pages.
--- end sig file ---Comment
-
Re: 42inch Touch Screen wont power on
Still missing a whole bunch of data. See post #89 again for the pattern and compare to your xls file.--- begin sig file ---
If you are new to this forum, we can help a lot more if you please post clear focused pictures (max resolution 2000x2000 and 2MB) of your boards using the manage attachments button so they are hosted here. Information and picture clarity compositions should look like this post.
We respectfully ask that you make some time and effort to read some of the guides available for basic troubleshooting. After you have read through them, then ask clarification questions or report your findings.
Please do not post inline and offsite as they slow down the loading of pages.
--- end sig file ---Comment
-
-
Re: 42inch Touch Screen wont power on
Hmm, I think from looking at the hot side data and the picture in post #20, I would have expected continuity between more pins in the primary and tertiary.
I'll see if tom66 and PlainBill concur or not. I could be looking at the wrong transformer too.
You might as well test "in circuit" the yellow transformer below the big one. You don't have to desolder, but we would like to see the same "all pins" combination test.Last edited by retiredcaps; 12-30-2011, 04:44 AM.--- begin sig file ---
If you are new to this forum, we can help a lot more if you please post clear focused pictures (max resolution 2000x2000 and 2MB) of your boards using the manage attachments button so they are hosted here. Information and picture clarity compositions should look like this post.
We respectfully ask that you make some time and effort to read some of the guides available for basic troubleshooting. After you have read through them, then ask clarification questions or report your findings.
Please do not post inline and offsite as they slow down the loading of pages.
--- end sig file ---Comment
-
Hi all!
I'm trying to troubleshoot a Microsoft Surface Pro (5th gen) model 1796 that won't power on. Motherboard model is M1007506-015. My priority is retrieving data, but the SSD is integrated so it looks like if I can't repair it it'll need to go to a data recovery company. I've done a little basic board repair before, but nothing this advanced until now. So please forgive my ignorance in advance. š
I found the boardview for this laptop in the forums here, and am able to open it on my PC with FlexBV.
https://www.badcaps.net/forum/troubl...-hardware-devi... -
Hi All,
We've got a HP Envy 12th gen that has been dropped and the LCD panel itself has cracked. The glass is fine just the panel itself is cracked. We ordered a replacement screen assembly using the part number off the HP part surfer website.
Upon installation the touch screen now does not work either in UEFI or win 11. Device manager under the "intel Precise touch and Stylus) menu notes "This device cannot start (code 10) Status_Device_Power_Failure".
I've tried all the usual troubleshooting steps like reinstalling the driver, uninstalling... -
After upgrading the factory 128Gb SSD to a 512Gb WD_Black SN770M, this surface pro lost touch on screen, no touch in windows or in UEFI.
The Human Interface Devices did find touch and stylus but it shows Disabled in windows device manager.
I am not sure if this is a bios problem or hardware problem, already tried reinstall and reset from windows, not working. And now trying to clean/reset the bios.
Computer model is: Surface Pro 9, i5, 8GB memory, 128GB
Serial number: 0F00S2Y22353BF
Intel(R) ME Code Versions:
BIOS Version 12.200.143
MEI Driver... -
original screen was BOE NV156FHM-T07 with On-Cell Touch screen IĀ²C
replaced with what was in my stock, which is IVO R156NWF7 R2 which is also with On-Cell Touch screen IĀ²C
now touch screen works perfectly in UEFI BIOS menu & boot menu. but not working in OS, tried windows & linux too
with original broken screen i can see in device manager touch screen in human interfaces
but with the new screen it's not showing in device manager
is it lenovo blocking it? is it driver missing?
IĀ²C is a headache -
Hello,
I have an HP 15-eh1070wm laptop that came to me for the same reasons I am starting this thread. The charging LED appears when the laptop power adapter is connected and the power LED appears when pressing the power button, but nothing appears on screen.
First thing I did was take off the bottom panel and remove the battery and then press and hold the power button for 30 seconds and then reinstall the battery and power on. The fan spins and this time, the back light illuminates and a brief message appears on the screen for about 1 second saying something along like,...
Comment