Sir Texascowboy . . . . . . . . ("Here We Go!" )
THINK ABOUT THIS NOW . . . . . .
We see the . . .erCAP
ker V1
Circuit board, which we are to assume that initially rated 2 watt wire wound resistor come from . . . . and you never did definitively say if the resistor unit went . . .belly up . . . open circuit. ? ? ?
Also visible us an upper mammoth E-cap and an adjunct " SOLAR" connector (pin sized. for NOT a sizeable amount of current capability ).
Matter of fact, the slide switch located lower down is current rated higher than that just mentioned connector.
Then there is that next connector that width and end shapes, no what near a mini USB or that family of connectors.
Then there is the very bottom black push button? / switch? / connector?
Now an analysis . . . . .
If the original resistor failed / by open circuit . . . . . .likely by some serious overload subjection . . . . .
1 . . . . .Consider a RARE possibility of internal loss of resistance wire element end to wire lead bond.(Manufacturer defect)
2 . . . . . Power over consumption of that resistor over a time period, results in its going open circuit . . . . . .fortunately that is accompanying with a clue by, with a cumulative darkening of the cermet central potting compounds surround.
3 . . . . . That resistor was just FLAT overloaded, and a resultant opening up.
If being the last possibility was the situation . . . . . . consider that a 2 watt rated unit would run" forever" at that / its rate of power dissipation.
Have 3 watts running thru it . . . . . and your finger touching it tells you that it can feel it.
At 4 watts thru it . . . . .your finger says . . . . .that thing is getting W . A . R . M
At 5-6 watts thru it . . . . .your finger says . . . .that thing is getting HOT. . . . . . resistor eventually opens up.
NOW what if circuit design intent was for that 2 Watt marginal rating to serve as a protective fusible resistor (sacrificial / blow-up-able on overload) for its connected circuitry.
If such was the case, your changing to a 5 watt rating would end up in a FIERCE current passage before effectation.
SUGGESTION . . . .
Upon installation of that new resistor it might just overload on powering up.
With a new 3.3ohm value . . .you decided upon . . . . at higher wattage . . . . . initially take a voltage reading across that resistor in DC (and then also do AC) meter voltage function, to see what voltage is being read across it .
So initially, have metering clipped across that new resistor to see if greater than 6.6 VDC reads across it . . . . .initially meeting the initial 2 watt specs.
If perchance, greater than 16.5 VDC . . . . . . meeting your new resistors run spec . . . . .shut power down. . . . .investigate.
If the unit runs at below those spec limits . . .ADDITIONALLY . . . . test at ALL other modes of operation that might be pulling much more power thru it.
That's the best that I can do, with our not even knowing equipment function and circuitry / schematic assist
73's de Edd
Some people elate happiness wherever they go . . . . . . .
with others . . . . . its whenever they finally go.
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