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CuriousJohn
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Last Activity: Yesterday, 02:36 PM
Joined: 12-25-2018
Location: Britain
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  • MCU removed and S/C resolved.

    Next problem after installing new PIC32 is tp flash it with already achieved extracted HEX dump of working board. Believe it is possible to upload the HEX dump back to the MCU in MPLAB X IDE.......? Currently struggling to convert it to a Bin anyway so more learning next week when MCU delivery arrives glad to report its not protected or encrypted according to configuration bits menu from MPLAB...
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  • Bowflex Max M7 console board power distribution and stuff

    [URL=filedata/fetch?id=3291001&d=1718463252][ATTACH=JSON]{"alt":"Click image for larger version Name:\tBowflex_Max_M7_console _power_diagram.png Views:\t4 Size:\t3.28 MB ID:\t3291001","data-align":"none","data-attachmentid":"3291001","data-size":"medium"}[/ATTACH][/URL]...
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  • Thanks for the tips folks the IPA CC CV method is pretty cool i bought a USB pwoer supply with CC CV function for cheapish much cheaper than a bench psu anyway and it worked.

    ...
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  • I agree, my next step is to restore the BUK only and see if everything but what is fed by U18 voltage regulator (fed from BUK) is happy. Then i have the task of checking all coupling capacitors to every chip on the bus as there is nothing else i can find to suspect but as i said i really do feel the cpu is done as its the weakest point having lowest maximum voltage tolerance of all chips on the bus and most connections to ground and bus (think ohms law with loads in parralel) but to determine that none destructively is the prize and i am now considering injecting current controlled 2.85v down...
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  • Thank you for the tips i have IPA on hand so will think about that one and these days bench psu are not to expensive and it would be a sound investment.

    I am glad to say by the weekend I should have access to a working console unit but one thing i did learn yesterday after trying one out for the first time on another machine miles away is the cpu sends the entire thing to sleep in 5 minutes so all leds and the lcd are cathode controlled by the processor and there are transistors scattered about performing this function. I know its theory of operation but it all helps to understand...
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  • Its a great idea with the limited kit i have i did that already, a thermal camera would knock out the park but now im at the price of just buying a new console for £520 and thats no fun at all....
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  • I dont do this very often so i dont have a bench PSU on hand though i might get one and a way to measure micro ohms sounds good but alas i have never tried that either because i dont have the kit (at present). I did not find the specific regulator I was looking for on mouser, im sure there are plenty that are compatible but i refer you to opening statement in this reply but i do appreciate you looking in and laughing, can you show me where i asked for help to find the fault? All i need is firmware really can you help with that?...
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  • Hi folks. I will post a board photo later tonight when i have time and maybe treat you to a diagram of my reverse engineering of the power distribution on this board...

    I was thinking about this situation last night in bed trying to get to sleep that i never measured the resistance between vcc and gnd of the pic32 icsp port headers that are soldered onto the board and i got up today its the first thing i did as the kettle boiled for morning coffee to see if there is a chance the 512KB integrated flash in the chip survived the over vault situation but sadly not this to is measuring...
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  • There is still a short somewhere after the voltage regulator (removed) that is fed by the BUK measured as 0.7 ohm to ground the smd cap smoothing the output to GND was open i was hoping short but hey ho and this line supplies cpu among others i think its supposed to be 2.85v with something like 3.3v coming into it from the BUK. Ive probed about and figured out the power distribution on this board and removed the odd cap for testing my guess is the short is in the CPU as it has the most connections to the regulator and ground and it has the lowest tolerance max voltage of all the components fed...
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  • Bowflex nautilus firmware woes

    Hi Folks i dont post much but i have need today please read on and maybe we can get these things sorted.

    I am on a health drive and last week bought a Bowflex max M7 to push on with my desire to get fitter but it was bought with a none functional "console screen" though the screen is dead the machine still works fine you can adjust the resistance manually like a bicycle brake adjustment it is cable fed but i want the programs and heart rate/calorie functions for my health drive. A new console is available but im getting quoted £520 or thereabouts and Bowflex as of yet have...
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  • Re: Sony 4k TV XE8004 series backlight main board issue

    The wire into pin 1 controlling backlights has been removed from the connector block and taped back just in case and did wonder about the multilayer board if something had gone OC. Didnt see point in attempting reball when everything else was ok if MB fails in time it can be replaced at that time and resistor removed no hassle.

    Have run the set for 12 hours straight and apart from not connecting to wifi for a a few minutes (now working stable) it all works really nice and cracking image indeed its first Sony 4K...
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    Last edited by CuriousJohn; 02-24-2020, 01:36 PM.

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  • Re: Sony 4k TV XE8004 series backlight main board issue

    Ok had good result today the TV is up and running very well... I found the right pin to switch backlights on without any invasive action this will run the TV until or if the Mainboard does die but it has no other faults detected so far. See photo for solution, no backlight on signal from main IC so on power distribution board LD1 connected 1K resistor between Power up signal and backlight signal on CN3000 connector and it works a treat but not for the purists lol do it at your own risk i had to follow it all back carefully...
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    Last edited by CuriousJohn; 02-23-2020, 01:34 PM.

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  • Re: Sony 4k TV XE8004 series backlight main board issue

    Hi thanks for reply, did some local heating with hot air carefully in attempt to reflow i think i said reball in op but got those two concepts mixed up and that totally killed the backlights anyway so havent removed the IC that would be the next step I guess and a first for me but im here to learn, might try another reflow before i do reball :-)

    Last night i had a good look at the power distribution board im trying to determine the way the inverter is controlled to trace back the signal but as you say its sounding...
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    Last edited by CuriousJohn; 02-22-2020, 04:48 AM.

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  • Sony 4k TV XE8004 series backlight main board issue

    Hi folks another doozie here,

    Got this TV on my table this week and at first suspected a simple failing LED on the back lights as symptoms where backlight coming on at power up and within a few minutes flickering then failing other than that TV works fine.

    This set is side lit and noted sometimes the flickering would start right away even during boot, after testing found backlights + inverter good. To cut a long story short found that applying pressure to specific spot on mainboard heatsink caused backlights to come on or off and even moving chasis about caused this other...
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    Last edited by CuriousJohn; 02-21-2020, 07:22 AM. Reason: image of MB added

  • Re: Samsung JU6000 panel issue post backlight repair

    For the record this lasted a day as lines returned and liquid crystal started leeching turns out there was a fracture up the right side of the panel an inch from the edge as with some light pressure of my fingers i pushed it in with a snap and that was the end of this TV. I will never leave a panel out longer than a day from now on.
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  • Re: UE40EH5000KXXU No power completely dead

    Had some good learning and practice on this set so far the mainboard has multiple problems the first being this melted Z1051PI which i have now restored but it might not look pretty to the more skilled tho its electrically sound, it was melted so bad i had to repair the track underneath using a thin sliver of copper. See photo below.


    The new Z1051PI now provides 3.3v out however the set is still dead. Thanks to the Service manual power tree discovered IC202 a sop23 npn transistor has failed taking the minicom with...
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  • Re: Samsung JU6000 panel issue post backlight repair

    Thanks for replies have had success took bezel off again today and found two side tabs clearly faulty as manipulating them caused lines and panel short so clearly they been damaged whilst panel was out to long, lesson learned. Glad to report panel is restored thanks to Tabs on BOTH sides.

    Still looking for good learning on panel theory if anybody knows of a recommended ebook etc my books are 20+ years out of date now those aliens have no appreciation for relative passage of time away form earth...
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  • Re: Samsung JU6000 panel issue post backlight repair

    yeah tabs on both sides.
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  • Samsung JU6000 panel issue post backlight repair

    Hi folks I really would appreciate help on this one as the panel was working fine before removal and i never had such issues before. hope somebody can tell me the stupid thing i did or didnt do here....

    This TV needed purple back lights replacing so did the work and upon re assembly the panel appears problematic, see photo below. Right side fades out with some horizontal white lines but they dont run entire length and a small vertical mess of lines far right from mid to bottom. I have noted when i apply pressure to the right side in the centre edge of the bezel the panel...
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  • Re: HP Pavilion 15-N096SA (U83) missing +12vALW

    Ok i missed some things on my sheet like pin 6 and 7 for instance 3VSUS is peaking with the flashing power light between 0v to 1.6v could be higher my meter is basic i know all supplies coming in to chip are good.

    problem appears to narrowed down to internal short of PU6 between Vin and ground as just replaced PR118 due to it being way out of tolerance some 1K when its a 22 ohm part (220) and still no VAD on PU6 side of it, PC145 defo not short removed for now and inspected tracks and pads for shorts using microscope....
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