so I am having a very hard time finding a main board for this model tv. so I wanted to see if I could jumper PS-0n and see if my old mainboard will show full screen. I purchased a used board but seems it is for a 42" model. if someone could tell me how to jumper PS-0n so I can do it without blowing up the tv. thanks so much.
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Re: maxent MX-50HPT51 PS-ON help
Usually a 1kohm resistor from 5V to PSON is used.
Note that a bad mainboard which isn't turning on PSON will also rarely show a picture as it is getting stuck in that part of the boot up phase.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. -
Re: maxent MX-50HPT51 PS-ON help
is it possible that I have some voltage regulators that are not working. Or could it be possible to reprogram the 42" board with the 50" software?Comment
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Re: maxent MX-50HPT51 PS-ON help
It may be possible. If it's a 42" 720p plasma, it will be 1024x768 whereas the 50" 720p would be 1365x768. It might still work with a picture centred on the top left; it then may be possible to adjust using the service menu. But if the picture is scrambled due to the incorrect resolution, you would be stuck...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
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Re: maxent MX-50HPT51 PS-ON help
I'm having a similar issue trying to locate a main board for one of these. I'm wondering if I could get the 42" version, which appears to be the identical board, same numbers, etc., and swap eeproms. It actually works, but once it's turned on, none of the buttons or remote work and after a while the picture gets screwy. I'm thinking that the eeprom swap would work, but if the eeprom is the problem, then I'd be out $70.------------signature starts here------------
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Re: maxent MX-50HPT51 PS-ON help
I tried swapping the eeprom from my old main board and it didn't work either. I have already sold this for scrap but I was thinking if you were able to get into a service mode you should be able to select the right size of screenComment
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Re: maxent MX-50HPT51 PS-ON help
I was hoping you were still around. Thank you for the reply. Did you swap just the removable flash module (IC907) or also IC906 which is above it? I'm thinking it would be necessary to swap both.Attached Files------------signature starts here------------
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Re: maxent MX-50HPT51 PS-ON help
I just replaced IC 907 that could be why it didn't work.Comment
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Re: maxent MX-50HPT51 PS-ON help
Probably so. I believe there's firmware on the other one. I found some smd electrolytics that seemed a little dodgy on the ESR so I'm going to replace them first. If that doesn't fix it, I think I'm going to try the 42" board and switch both eeproms. Thank you for the info, it definitely helps.------------signature starts here------------
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Re: maxent MX-50HPT51 PS-ON help
I still have the old board.Comment
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Re: maxent MX-50HPT51 PS-ON help
The 50" or the 42"?------------signature starts here------------
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Re: maxent MX-50HPT51 PS-ON help
it was for the 50"Comment
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Re: maxent MX-50HPT51 PS-ON help
Well, I think I fixed it. I replaced about 15 smd electrolytic caps and 4 through hole ones, all on the main board. All had very high esr. It's working so far. I've had a test video playing on continuous loop for several hours and have had no problems. Remote and key buttons are all fine too. I plan on thoroughly testing it before letting the owner come get it though.------------signature starts here------------
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Re: maxent MX-50HPT51 PS-ON help
Here's an update. My success was short lived. After putting the TV back together, it would only work for about an hour and then none of the buttons or remote would work. I found more bad caps, replaced them, still the same. I think it made a bit of a difference, and I'm still convinced it was bad caps because originally the buttons and remote wouldn't work at all after powering it on. Finally, I bought the board for the 42" and left the TV on with it overnight. Of course, the picture didn't fill the entire screen, and HDMI would just give me a black screen so I used PC , but all I wanted was to see if the buttons and remote would continue to work after it got hot. They did. So, I tried what I spoke about earlier. I swapped eeproms, although I've been told it's a flash chip, not an eeprom. I first tried swapping both the removable one and also the soldered one and it wouldn't power on at all. Then I put the original removable one back in and it works. The firmware now says it's the 50" version. I guess the removable chip must be matched to the individual board. I lost 1 pad during the swap and I used a short piece of heavy insulated 35awg magnet wire from the via on the bottom, up through another via and soldered it to the pin. So far, it's working great. Sure would have been easier if I could have just reflashed the chip without pulling it, but then I wouldn't know this can be done.
Last edited by lookimback; 03-05-2015, 01:52 PM.------------signature starts here------------
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Hello,
i have many 5050sff. all of them, and how i experienced over many years for all about 250 DELLs goin through my hands, are fully flashable and can be serviced in any way when the service_mode jumper is set.
Never ever i experienced problems with that.
Now i have one 5050sff machine, where this jumper isnt working at all.
I do not get the normal messge that the jumper is set when booting and a short test with FPT just confirms this. Everything is locked -->> EVEN for reading !?
The history of the machine is that i used it in my office... -
Hello,
Apologies, I broke a rule and hijacked a thread, so I deleted that post.
I am curious if anyone here owns the G8 or has good quality board shots?
I've done some googling and curious if the 805 G8 series has some kind of jumper?!
The 800, G3 series, much older, the maintenance and service guide, clearly talks about a PSWD jumper
https://cdn.badcaps-static.com/pdfs/...cc246ac326.pdf
I also believe it's just visible in this shot:
https://www.servethehome.com/wp-cont...-EliteDesk-800... -
Hi I need help with a Samsung un43nu7100 BN94-13191C/BN41-02635A with boot loop problem even with tcon jumper.
I've already try tape method and same happen, if I disconnect both flex from mainboard to panel tv boots normal even I hear Samsung sound.
When I solder jumper to make t-con work with or without panel or panel cables connected it still reboot or power cycling.
What I noticed is that there's no voltage in VHG, HAVDD, PANEL_3.3V, AVDD_17V or 12v near dc-dc chip.
I check capacitors and diodes and didn't find any short IN MAINBOARD.
Measured all power supply... -
Hi:
I am trying to repair this modular ATX PSU. It only has the 5V Standby and PSON enabled (3.33V).
PSON is delivered by (ST9S429-PG14) in pin4. This chip is a Voltage controller but it doesn't seem to trigger any PWM signal to pass it to primary through coils and "move" the big mosfets. Also next to it there is a EST7618 that it also seems a voltage controller.
Not sure if in the right direction, but trying to find where PWM signal is generated.
Green section seems that could be the "PWM section". It's driven by a... -
Hello everybody
I have a Jumper EZBook x7 with no picture, caps lock no working. The laptop starts, the CPU gets warm, after a while the fan starts spinning but nothing on the screen. Current consumption is stable, about 1 amp. I can't see any short on the motherboard (CPU resistance very low but mosfets seem OK).
I suspect a bios issue (or a problem with the onboard RAM), but can' find any bios for this model. I already try to clean the ME Region, but without any success. If someone has this laptop, can he please share the bios? Please find attached the dump of my original...
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