Comments on: Intermittent Problem In 40 LED Philips Light Solved

By: Parasuraman S

Parasuraman S — Mon, 26 Aug 2019 13:56:59 +0000

In reply to A L PANDIT.

Thanks for the tips. I could download it now.

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By: Robert Calk Jr.

Robert Calk Jr. — Tue, 20 Aug 2019 21:12:04 +0000

Good job, Parasuraman!

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By: A L PANDIT

A L PANDIT — Tue, 20 Aug 2019 14:20:11 +0000

Dear Sir,
I have downloaded driver IC datasheet Pdf by adding prefix Sic. I am very much interested to go through all your repair articles on this site. I love the way you represent with minute details.
Regards,
A L Pandit

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By: Parasuraman S

Parasuraman S — Tue, 20 Aug 2019 13:02:59 +0000

In reply to Albert van Bemmelen.

Yes you are right! Good tip on checking dry solder of SMD resistors.

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By: beh

beh — Tue, 20 Aug 2019 08:07:11 +0000

well done and the good job .these days I am struggling with unknown smd transistors on the mainboard of telephones. cheers........beh

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By: Albert van Bemmelen

Albert van Bemmelen — Tue, 20 Aug 2019 07:22:19 +0000

I guess that although Leds are very energy-efficient they also produce some heat that can cause problems with wires getting hot or maybe melting solder. Especially at the pcb where the diode bridge rectifies the incoming current. But it probably was bad soldering and bad manufacturing that in time caused the intermittent problem. But don't rule out any broken SMD resistors that in case they act as unstable component can cause these problems too. I know this from my days when I fixed portable Bar Scanning handheld devices at a company called HHP in Eindhoven. Where we tested each tiny resistor with our soldering Irons on broken resistors by heating on side while watching if the part separated from the still soldered other half side. Or if it was loose on its solder metal end caps.

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