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Author Topic: Home light not staying on? 1537  (Read 1259 times)

Offline Nick_Sparkle

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Home light not staying on? 1537
« on: February 06, 2021, 10:02:27 AM »
The controller works fine but the light does not come on either wired or with batteries . I changed the smd thinking it was that but it does not light up still.Strangely when I touch the soldering iron on the negative end it then come on! But it goes off the moment I pull the iron away. (I have the board wired through the micro usb to a power bank to test it ) so it probably wasn?t the light that had gone after all. Any ideas anyone what it could be please?
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Offline RDC

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Re: Home light not staying on? 1537
« Reply #1 on: February 06, 2021, 12:00:14 PM »
The schematic for both of those boards is in the 1537 thread. Not much to check in that circuit but a Transistor, couple Resistors the connector and traces.
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Offline MattP79

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Re: Home light not staying on? 1537
« Reply #2 on: February 06, 2021, 01:24:21 PM »
Quote from: Nick_Sparkle on February 06, 2021, 10:02:27 AM
The controller works fine but the light does not come on either wired or with batteries . I changed the smd thinking it was that but it does not light up still.Strangely when I touch the soldering iron on the negative end it then come on! But it goes off the moment I pull the iron away. (I have the board wired through the micro usb to a power bank to test it ) so it probably wasn?t the light that had gone after all. Any ideas anyone what it could be please?

Check for a micro crack in PCB trace or solder connections of nearby transistors and resistors. I think you will find LED will light if you put pressure on the board without it being heated.
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Offline Nick_Sparkle

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Re: Home light not staying on? 1537
« Reply #3 on: February 08, 2021, 02:25:35 AM »
thank you for your help, ill have a look again now
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Offline Nick_Sparkle

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Re: Home light not staying on? 1537
« Reply #4 on: February 08, 2021, 03:43:00 AM »
on further examination the R5 is coroded. looks like the micro usb has been replaced and flux left everywhere. is this a capacitor? ts just disintergrated when ive tried to clean with ipa. could this be the reason its not lighting up? thank you once again everyone
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Offline RDC

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Re: Home light not staying on? 1537
« Reply #5 on: February 08, 2021, 07:07:19 AM »
It's a Resistor, 80 ohms.
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Offline Nick_Sparkle

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Re: Home light not staying on? 1537
« Reply #6 on: February 10, 2021, 01:38:03 AM »
Would this cause it to not light up RDC? I dont want to spend time taking one off a broken one and then that not be the problem. I cannot see any other faults on the board. thank you once again
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Offline RDC

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Re: Home light not staying on? 1537
« Reply #7 on: February 10, 2021, 07:12:07 AM »
It could cause it to not light up, as it's the current limiting Resistor for the LED there. Doesn't mean it will make it light up, as I have no idea what shape the traces, vias and whole other side of the LED are in.
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Offline Nick_Sparkle

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Re: Home light not staying on? 1537
« Reply #8 on: February 12, 2021, 01:51:21 AM »
Thank you for getting back, ill take one off another faulty board and see it it works
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