I have a strange fault that I need help understanding. The TV is run with a PCB labelled TP.MS6486.PB711.
As you will see in the pictures there is a red patch over the right hand side of the screen that is far more visible on a black background but never goes away. It appears like it is some sort of driver fault but I don't know enough about how these panels are driven to even guess where to start looking. Any advice would be greatly appreciated. Thanks.
Announcement
Collapse
No announcement yet.
User Profile
Collapse
-
Re: WT7527 supervisor shutting down a good PSU
I does keep running and all the rails are fine but the PG is held low. If you toggle PSON while it is running the WT7527 resets and PG goes high.
The issue is that at startup the WT7527 sees something it is not happy with but I can't figure out what or why.
The V pins on the WT7527 are all OK. The I pins are all a few millivolts lower. Resistance between the V and I pins on 3.3 and 5 are 470 Ohm and both the 12's are 1K. PGI has a threshold on 1.2v and sits at 2.8v. It all looks just fine...
Leave a comment:
-
Re: WT7527 supervisor shutting down a good PSU
Thanks for the comments all.
The capacitor was a Ltec brand and Googling tells me it is not well thought of so I will swap the others anyway when I win with it. I have pulled every cap on the PSU and only the one 2200u was down.
I have 2 capacitors in series after the bridge in my PSU so no APFC.
I have plugged it into an old motherboard to act as a load and it still shuts down but it runs for longer so maybe it is a regulation issue at 1st startup. If I use my Hamtek scope it logs the max voltage...
Leave a comment:
-
WT7527 supervisor shutting down a good PSU
I have a dead ATX power supply. It is a Coolermaster RS-500-PCAP-A3 and the PCB is labelled PC7013-000G. The 5v standby is present and the troublesome output supervisor IC is a WT7527.
When you pull pin 4 (Power On) low the WT7527 starts the primary side by pulling Pin 3 (Fault Protection Latch) low. It goes to startup but then immediately releases Pin 3 and shuts the primary down again. I checked all the caps and only 1 2200u on the output side was down at 1400u but changing it makes no difference. The 431 is tested and is fine. The optocouplers also tested fine.
...
-
Re: Acer Chromebook CB3-431 short on 19v
That cap was a 22uF and if there is a great tool to match MOSFET's at [URL="https://www.infineon.com/cms/en/product/search/cross-reference/?ic=xrvg#!view=crossReference&term=SM4843NSK"]https://www.infineon.com/cms/en/product/search/cross-reference/?ic=xrvg#!view=crossReference&term=SM4843NSK[/URL]
Good luck with your repairs.Re: Acer Chromebook CB3-431 short on 19v
That cap was a 22uF and if there is a great tool to match MOSFET's at [URL="https://www.infineon.com/cms/en/product/search/cross-reference/?ic=xrvg#!view=crossReference&term=SM4843NSK"]https://www.infineon.com/cms/en/product/search/cross-reference/?ic=xrvg#!view=crossReference&term=SM4843NSK[/URL]
Leave a comment:
-
Acer Chromebook CB3-431 short on 19v
I have a capacitor shorted on the 19v rail after the input MOSFET's, the board is a Pegatron P4GCR.
The failed one is pictured below, has anyone got a schematic or can you suggest a replacement value?
Sadly, it has taken out the first of the input MOSFET's as well (SM4843NSK). I can get one on AliExpress but I can't find any in the UK/EU. Can anyone suggest a source or an alternative?
Thanks.
Link - [url]https://1drv.ms/i/s!Avs_xqxc14fjrFh5KmqCjBEHu8uR?e=I7DgSM[/url]https://I have a capacitor shorted o...nput MOSFET's,Last edited by MarkC1970; 10-20-2023, 01:11 AM.
-
Nand dump needed for Sharp 32CHF5111K
Can anyone link me to a NAND dump for a Sharp 32CHF5111K. It is built using the TP.MS3463S.PB711 board, it has all 3 HDMI ports and no SPI chip.
Thanks.
-
Re: TP.MS3463S.PB711 Start up loop
Any idea where I can source the NAND dump so I can reflash it? Pretty good chance it is that.
Leave a comment:
-
Re: TP.MS3463S.PB711 Start up loop
I thought it was in the TSOP48 and the underside.
Well that is interesting because this board has no IC populated there and neither does a donor board that I harvested some backlight parts off but never touched.
I wonder if there are different versions built on the same PCB?
I can't seem to embed the picture but it is at [URL="https://photos.app.goo.gl/56uAEviUx19RbNVKA"]https://photos.app.goo.gl/56uAEviUx19RbNVKA[/URL]Re: TP.MS3463S.PB711 Start up loop
I thought it was in the
Leave a comment:
-
Re: TP.MS3463S.PB711 Start up loop
Thanks. I could take the NAND off and get an adapter for my TL866ii but I can't find a NAND dump for my particular model of TV. Any idea how specific these NAND dumps are? I am thinking about screen resolution etc. Cheers.
My TV is a Sharp LC-32CHF5111K
Leave a comment:
-
TP.MS3463S.PB711 Start up loop
I have a TP.MS3463S.PB711 that is boot looping. Immediately you apply power the standby LED turns white but it doesn't start up. After about 30 seconds it goes red for a second and then back to white.
I have 40v for the backlight but no boost. Pin 8 (PWM) for the backlight boost is 137mV so it is off. DB101 is generating the 12v rail. The 5v rail is produced on LD1, the 3.3v is present on UL1 and the 1.2v is on LD2.
We appear to have all the power rails, no short on the backlight or anywhere else I have checked but she will not start up. Any ideas? Thanks.Last edited by MarkC1970; 02-17-2023, 03:56 AM.
-
Re: Sharp LC-40FG2241KF dead
Sorry, I just scrolled up and saw you want 105 and 108. I will check them later.
Leave a comment:
-
Re: Sharp LC-40FG2241KF dead
To solve my problem I have purchased a different board for £8 with the same boost coil just to pinch it. The PSU is working fine on my board and if you post pics of the components you need I will happily tell you what value they are....
Leave a comment:
-
Sharp LC-40FG2241KF failed LED boost converter
My Sharp LC-40FG2241KF with a TP.MS6486.PB711 mainboard has a failed LED boost converter. The FET (AOD458) was s/c and the rectifier/blocking diode (SR320) was also s/c. Both were changed as well as the input and output caps.
On powering the TV we get 55v on the LED rail. Immediately we take the TV out of standby the controller (OB3350CP) starts to trigger the Gate of the FET and it dies again (with smoke no less). The inductor is incredibly low resistance at 0.09 Ohms and I suspect it is short and so the FET is directly grounding the 55v supply, but I may be mistaken. Scoping the...
-
Re: Sharp LC-40FG2241KF dead
Hi Judderman69, did you ever find a link to the correct MS6486.PB711 schematic? I have one with a failed boost converter for the LED's that is causing me a headache. Thanks.
Leave a comment:
No activity results to display
Show More
Leave a comment: