May have sussed a fix for kv slow rc response

[jambutty]

Right I just may have some good news for anyone with a kv 750 that's got a slow response from the rc.

There have been some post about shorting the resistor R447 next to C414, some people have shorted this minute smd resistor and ended up with a box that has totaly stopped the remote working, if yer take a look at this resistor it don't look like the normal resistor with coloured bands, it's a smd type and really minute.

Here is the possable fix IF as stated that this is the resistor to short, and if is correct that having shorted this resistor then you don't have to replace it THEN here is a much simpler method on how to do this:

Inside the box you will see an 11 pin plug that connects the led pannel up with various coloured wires, simply snip the brown wire, do it in the middle so as if this don't work then you can simply join the brown wire back.
If has reported that this is deffo the resistor to short then my method has got to work, by doing this method it will either work or not BUT nothing to loose cos if it don't work then just connect the brown wire back up.
So yer got nothing to loose trying my method, if it works then great, if it don't then at least yer can join the brown wire back together and then rc will work again.
This is worth a try.

JAM

[mark36]

Originally Posted by jambutty

Right I just may have some good news for anyone with a kv 750 that's got a slow response from the rc.

There have been some post about shorting the resistor R447 next to C414, some people have shorted this minute smd resistor and ended up with a box that has totaly stopped the remote working, if yer take a look at this resistor it don't look like the normal resistor with coloured bands, it's a smd type and really minute.

Here is the possable fix IF as stated that this is the resistor to short, and if is correct that having shorted this resistor then you don't have to replace it THEN here is a much simpler method on how to do this:

Inside the box you will see an 11 pin plug that connects the led pannel up with various coloured wires, simply snip the brown wire, do it in the middle so as if this don't work then you can simply join the brown wire back.
If has reported that this is deffo the resistor to short then my method has got to work, by doing this method it will either work or not BUT nothing to loose cos if it don't work then just connect the brown wire back up.
So yer got nothing to loose trying my method, if it works then great, if it don't then at least yer can join the brown wire back together and then rc will work again.
This is worth a try.

JAM

sorry Jam but it dont work,well i'm no expert but thats got to rule the 447 resistor out of the equation.oh well back to square one.

[jambutty]

sorry Jam but it dont work,well i'm no expert but thats got to rule the 447 resistor out of the equation.oh well back to square one.

OK Mark thanks for trying this out, But main thing on this try is that at least yer can just join the brown wire back up and then rc will work albeit back to normal with a slow response, but it's better to have a sluggis rc than one not working at all.
As you sate Mark it's looking like this resistor 447 is the wrong one to short out.

Right another point has come to me that I may try lata, by snipping this brown wire then rc doesn't work at all, so it looks like it has got to have a resistor joined to the brown wire where it's been snipped if this is so then the hard part here is WHAT value resistor needs to be used, 100r was mentioned but it don't work so I'm gonna expiriment with some diff value resistors to see if I can suss it out.

If this fails then I am looking at a way of finding a smd on this board with the same value of the resistor that was shorted and then solder some thin wire from a same value smd resistor and then the other wire joined up with the brown wire, because this 477 resistor that was shorted runs along the brown wire and then the dead rc command may then be brought back to life, i.e. will still be a sluggish response from rc but so what as long as it gets the remote commands working again.

Jam

[jambutty]

Update on this issue.

I have nearly sorted the dead rc command out.

I have snipped the brown wire and then I soldered a wire to a SMD resistor at R493 near the shorted 477 (it's near a silicon chip) and remote is now responding again, BUT not quite solved it cos when I did this and pressed a button on the rc, it then functions BUT it just re-sets the box to standby and then switches back on again, so I'm really stuck on sussing this out, rc command is responding but not doing correct functions.
Questions I Want to ask are these.
1 Ronster said short resistor and yer don't need to replace one afta doing this.
Jam's Reply: Wrong cos when yer short this resistor then rc stops working.
2 The Coder said replace it with a 100r and he's has been fitted with this and he's box is perfect, he states Sorry no pics on this.
Jam's reply, OK take the lid off yer box and take some shots of this resistor thats in yer box and then this will gve me something to work on!!!

If I can get some replies from Ronster and TheCoder on this then I may be able to sort it, BUT I don't expect any possative help/Replies from these mentioned to help me/us to sort this issue out.

Bottom line on this is I could do with The Coder to take some shots on where this 100r resistor is In He's box.

One last thing, I don't expect a possative reply on this, So if the makers/suppliers of these KV's are looking then why don't you post a thread on here offerin' to supply a main board so the people who have followed this bad advise at shorting this resostor, a main borad would cost about £5-£10 to manufactur, so why don't yer offer to sell a main board for say £20 so it could be very easily put in a box with this bad main board.
I am now getting ****ed off at trying to solve this issue out
JAM

[steve1811uk]

If some one has the circuit schematic then that would surely help. All the shorting and cutting without the schematic is just guesswork and likely to damage the box. Be warned!!!!

[TheCoder]

Originally Posted by jambutty

Bottom line on this is I could do with The Coder to take some shots on where this 100r resistor is In He's box.

I have tried to take a piccy with the mobile but, tbh, its just not good enough to show very much. I dont think it can focus closely enough to pick up the small components except as blobs !

The resistor I replaced is just behind the front panel connector on the far right of the set of components (looking from front of box) next component on the left is C414. Next component on the right is EC791 (a 470uF electrolytic capacitor).

Cant actually see the component designation on the actual resistor as my replacement wasn't the correct size and is fittd at a bit of a strange angle.

Board is marked "Tool No2" and "REV1.0 2008.11.11" in front left corner (left of front panel connector)

edit: had another go with phone and got a not to fuzzy piccy. Not gonna win any awards though !

[orientville]

Just on a point of interest a head surround magnifying light can be bought at axminster.co.uk the product code is 200054 price is £15.70 or there abouts.This magnifyer should let one see more clearly the resistor 447 that has to be replaced by the 100r.Hope this helps.

[jambutty]

OK, Wots happened here on those who followed the advice to replace the 447 smd resistor made the mistake of completley removing the resisitor and also the solder pads AS WELL, this is the mistake cos if yer remove the solder pads from this resistor 447 then it's a smd type and then yer can't put the new 100r to these pads once they are removed.
Wot yer gotta do with this slow response with rc is this.
Carefully snip this smd 447 in the middle and it will snap the contacts making this 447 to short Thus leaving the solder pads in tact.
All yer gotta do now is solder the legs of the 100r resistor to the 2 pads and all will deffo work if yer carefull at doing this, I will stress that if yer damage or remove the pads doing this then there's no way to rectify this once yer damage the pads.
So be careful cos as I stated and has you know this smd is so minute, best bet is use a very very fine tip soldering iron to do this job.
Jam

[jambutty]

Originally Posted by TheCoder

I have tried to take a piccy with the mobile but, tbh, its just not good enough to show very much. I dont think it can focus closely enough to pick up the small components except as blobs !

The resistor I replaced is just behind the front panel connector on the far right of the set of components (looking from front of box) next component on the left is C414. Next component on the right is EC791 (a 470uF electrolytic capacitor).

Cant actually see the component designation on the actual resistor as my replacement wasn't the correct size and is fittd at a bit of a strange angle.

Board is marked "Tool No2" and "REV1.0 2008.11.11" in front left corner (left of front panel connector)

edit: had another go with phone and got a not to fuzzy piccy. Not gonna win any awards though !

The pic is ok, yea yer didn't destroy the pads and this why some guys have totaly shagged this job up due to removing the solder pads, as again be careful and use a fine tip solder iron and not too hot and do as previously mentioned and it will deffo fix this issue.
JAM

[TheCoder]

Has anybody with a board from a newer batch actually opened it up to check what value of resistor is now being fitted ?

oh, and just a thought, but make sure to use the latest version of the firmware. There may be some further remote tweaks that were done inside the code.