Stigsolbjerg
Member
Last Activity: 06-13-2024, 12:59 PM
Joined: 03-04-2020
Location: Bælum
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No, just the voltage it is 18 volt. When i connect it, it is 0,8 volt, it gives a little spark when i connect it -
It is measuring 10,1 milli ohm.
think i must try this voltage injection thing. I have this rd6006 switch mode psu. Any recomadation for settings?...Leave a comment:
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Think it was 0,12 ohmLeave a comment:
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Hi again had a Quick look today at the print. 10 Big resistor below the 4 pin plug for the batteri, its the one with 10M written on it, is it right that it is 0,01 ohm? Can not find a true match on the internet.Leave a comment:
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Gardena lawnmowerrobot mainboard, short out battery
hi again
this time its a mainboard from a mowerrobot, when i connect battery it shorts it, so the bms shuts down battery.
when take the mm in beepmode and measure from the positive to the negative battery terminal on the board it beeps shortly like 0,25 sec, and when i reverse the probes it beeps again shortly 0,25 sec.
when i mesure on the cap thats missing in pic nr 2, the bottom solderpath goes to the negative, the upper one is 1,2 ohm to negative is this a short?
hope Capleaker is still around -
Re: Gardena R38li lawnrobot mainboard power issue
hi happy news from Denmark.
its working
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i did order the 5 mosfets from the danish supplier, the 6,5-9 amps one.
my soldering iron had no chance at the mosfet, so i used the Dremmel and grinded the most off it away. Then i soldered in a new one and the rest of the componets. hooked it up, flipped the on/off switch and the display lights up.
Damm good feeling.
Thank u so much Capleaker, Curious.George and R_J for helping meLeave a comment:
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Re: Gardena R38li lawnrobot mainboard power issue
No sorry, i was only Looking for cheap plaeses to buy now. I am still trying to figure out how to desolder the FET from the PCB, i do NOT have a fancy hot air soldergun/blower thing.Leave a comment:
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Re: Gardena R38li lawnrobot mainboard power issue
Hi R_J im sitting here and looking to buy new mosfets, you linked a data sheet to a 20 amp one, but at digikey they only have a 9-6,5 amp one. and at r.s.online they have both, but calling the 20 amp fdd8424H-f085a.
so now im totally lost, is the 9-6,5 amp ok? i can buy minimum of 5 of that.Leave a comment:
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Re: Gardena R38li lawnrobot mainboard power issue
ha its a 1F33AB FDD 8424H. im suspecting i need a new one, does enyone have any ideas where to find one (laptops-printers-tv´s) or do i order in china and wait for 3 weeks.Leave a comment:
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Re: Gardena R38li lawnrobot mainboard power issue
hi Capleaker and R_J. you got me thinking could it be the powerswitch, hooked it and and the problems still there.
so i started looking for shorts on the mosfets. but i dont have a clue on how to look on mosfets, so here is what i found. all of 9 mosfets are shortet like the one marked whit green, but only nr 8 are shorted 2 more places marked blue and red on the pic. is this right done?...Leave a comment:
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Re: Gardena R38li lawnrobot mainboard power issue
hopefully a better pic here...Leave a comment:
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Re: Gardena R38li lawnrobot mainboard power issue
you were right, took the cap of today, and the short is still there. I sadly tore one of the traces of the board and damaged it a bit, that cap was very hevily solded under its socket. but i think it can be repaired.(see attached pic).
you said there could be a short in the nine fets. How do i check that....Leave a comment:
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Re: Gardena R38li lawnrobot mainboard power issue
HI now i am measuring on the board.
no. 1. in the battery connection between + and - i get 6 kohm and rising fast to 1000 kohm, maybe starting from zero ohm.
no 2. on the big electrolytic cap (next to the blown something) there is only 2,4 ohm
no 3. on the big electrolytic cap same size as no. 2 there is 3,66 kohm
no 4. from the battery connection there is 2,5 to 3 ohms on both sides of the blown thing.
no 5. from the blown thing to the electrolyte there is 2,7 to...Last edited by Stigsolbjerg; 09-28-2020, 12:10 PM.Leave a comment:
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Re: Gardena R38li lawnrobot mainboard power issue
Hi Capleaker, that was also one of my problems. I thougt it was the most obvies, since there is this giant forum named after it. But i asked in a robot forum, for close up pics of the board.
Do you have better idea than a cap?Leave a comment:
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Re: Gardena R38li lawnrobot mainboard power issue
Here is some pics off the board...Leave a comment:
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Gardena R38li lawnrobot mainboard power issue
Well i have this Gardena R38li lawn robot, that is giving me a headache. it had a blown somthing and a bit of corrosion on it.
attempt no 1. when i put the battery cable in, it shuts off the 18 volt battery.
attempt no 2. i tried soldering a new cap in where the blown thing was, battery still shuts off.
attempt no 3. desoldered the cap from attempt no 2, used and external powersupply and it instantly draws 6 amp at 12 volt (max on my gauge).
but i never can measure a short from + to - .
please help me, get this thing alive againLast edited by Stigsolbjerg; 09-26-2020, 02:18 AM. -
Re: Toshiba 48L5463DN no picture, backlight on
Hi i can now call it a succes, the tv has been running for two nights now. The lines went away when i reseated all the cables on the boards. So i want to thank you all very much for your help on this projekt. So yokoono and budm if you ever come to Denmark, beers are on mee....Last edited by Stigsolbjerg; 03-12-2020, 03:18 PM.Leave a comment:
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Re: Toshiba 48L5463DN no picture, backlight on
Well now i almost have fixed the unrepareble panel board.
I took these to caps of the board, and one one of them was bad, so i replaced it with one from a hairdryer (about same fysical size), and got this picture on the screen. Now i just need to get rid off those lines, but how?...Leave a comment:
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Re: Toshiba 48L5463DN no picture, backlight on
Panelboard nr...Leave a comment:
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Re: Toshiba 48L5463DN no picture, backlight on
I desoldered this thre components (look at picture), none of them had a resistance near 24 ohms, its more like 1 megaohm and incrising to 20 mohm. And measuring at the Avdd testpoint on the t-con board, there is.still 24 ohms even when the componts is removed from the board.
Now what?...Leave a comment:
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