Can you dignose from the photo ? . Toshiba 65S2650EV

[Ancient1]

Re: Can you dignose from the photo ? . Toshiba 65S2650EV

locally I can get 0.22 Ohm 5W .
Checking eBay , 0.23 n/a but 0.22 are common

[Davi.p]

Re: Can you dignose from the photo ? . Toshiba 65S2650EV

but i need to know the a actual resistance of the wire resistor even with the prolonges, with the most precise tester you have..

[Davi.p]

Re: Can you dignose from the photo ? . Toshiba 65S2650EV

when measuring don't touch both terminals with fingers..

[petehall347]

Re: Can you dignose from the photo ? . Toshiba 65S2650EV

in case you didn't know already touch meter probes together first and any reading deduct from whatever the resistor reads ,
also you could build a wheatstone bridge out of precise resistors .

[Davi.p]

Re: Can you dignose from the photo ? . Toshiba 65S2650EV

but thinking on there, normal meters have only 1 decimal so are not suitable for that task.. so try with the 0,22ohm but not 5w, them are unfit , to have got more room better 1w or 2w..

[Ancient1]

Re: Can you dignose from the photo ? . Toshiba 65S2650EV

My Meter has 3 places after the Decimal dot
However, when measuring R of the Probes ( at their base, fingers not touching) : I get a fluctuating R , from 0.8 to about 3.5 , not fast but like every step is 1 second.

I measured the Wire Resistor , isolated , in a Clamp : I did get slow fluctuation but longest time was on 0.8-0.9 .

I can go and look for a Fluke at some shop .

Davi.P : Perché non scrivere in italiano? Posso tradurre facilmente perché principalmente su un PC [ Why not write in Italian ? I can easily translate as I am on a PC mostly ]

[Davi.p]

Re: Can you dignose from the photo ? . Toshiba 65S2650EV

yes, depends which type of meter you have, if not auto range, need to know how many decimals you have in 200ohm scale, i guess you have only 1, so better to get 0,22 resistors, a fluke can cost 250euro 2nd hand to you, not for an hobbist!.. I can't talk in Italian cause the site is in English and also other users are following this thread, sorry..

[Ancient1]

Re: Can you dignose from the photo ? . Toshiba 65S2650EV

nested problem solving : I actually have 3 DMMs. 1 old Analog, 1 cheap chinese that I can't get to work normally , and one digital 000.000 display. I'll try to fix the chinese or go sunday to a repair shop to get accurate reading.
translation :
[risoluzione dei problemi annidata: in realtà ho 3 DMM. 1 vecchio analogico, 1 cinese a buon mercato che non riesco a far funzionare normalmente e un display digitale da 000.000. Proverò a riparare il cinese o andrò domenica in un'officina per ottenere una lettura accurata.]

P 3 x 0.23 => 0.08 R , and 0.22 give 0.07
is 3 in parallel the only way to get this 0.07 R ?
translation
[P 3 x 0,23 => 0,08 R e 0,22 danno 0,07
è 3 in parallelo l'unico modo per ottenere questo 0,07 R? ]

[Davi.p]

Re: Can you dignose from the photo ? . Toshiba 65S2650EV

Please don't translate, i can do it by myself, 0,22 is the best way to obtain it, if you hav 6 digits meter then is the best so why not to use it? 3x0,23 are not 0,8 , the formula is 1/(1/R1+1/R2+1/R3), if you find a better combination let me know, 3x0,22 gives 0,73, 3x0,23 gives 0,76, not precise as 0,75

[Ancient1]

Re: Can you dignose from the photo ? . Toshiba 65S2650EV

I used online calc.
My Digital Multi Meter (DMM) has 4 places. As I said , I get fluctuations.
I'll go to a tech shop tomorrow, ask them to measure

[Ancient1]

Re: Can you dignose from the photo ? . Toshiba 65S2650EV

Been to Tech Shop , Fluke , he got 0 , couldn't measure.

I doubt I can buy 0.22 localy (haifa), I will call tel-aviv tomorrow , see if I can get faster than aliexpress . I understand that the 5W , blocky, resistors are not good ( why) , and that I need to find 2W max

[Davi.p]

Re: Can you dignose from the photo ? . Toshiba 65S2650EV

i don't know if you have room for 3x5w..

[Ancient1]

Re: Can you dignose from the photo ? . Toshiba 65S2650EV

Tel Aviv store has 0.22 2W. But they don't send by mail.
So its time to call my cousin ...

[Ancient1]

Re: Can you dignose from the photo ? . Toshiba 65S2650EV

They were bought. Now delivery.. hopefully soon

[Ancient1]

Re: Can you dignose from the photo ? . Toshiba 65S2650EV

Hi

I got 3 the resistors , measured and installed - see photo.

No Luck

I will carefully inspect the board again, maybe I missed something
and than probably order a new PSU , I owe it to you guys , esp. Davi.P

[Davi.p]

Re: Can you dignose from the photo ? . Toshiba 65S2650EV

you can try put back the original wire resistor, desolder r37, solder 2 wires on its pads, between those you put in series a through hole resistor same as r37, and a trimmer starting with lowest value and try increasing in many tries..

[Ancient1]

Re: Can you dignose from the photo ? . Toshiba 65S2650EV

I think have 1-1k trimmer. With R37 ( code 562 ) being 5600 Ohm, I think maybe I should use a lower value resistor , so I can get values above and below 5600 Ohm ?

[Davi.p]

Re: Can you dignose from the photo ? . Toshiba 65S2650EV

you don't have to lower the r37 but only increase, so put a 5k6 resistor in series with trimmer.

[Ancient1]

Re: Can you dignose from the photo ? . Toshiba 65S2650EV

I don't have a larger watt Resistor.. I'll rig some cooling fins .. and hope

[Davi.p]

Re: Can you dignose from the photo ? . Toshiba 65S2650EV

larger watt?? who have said that? that in pic goes well, it's a 1/4w..