Comments on: Servicing Ikon Megaray Torch

By: Vytas

Vytas — Tue, 10 Jul 2018 12:42:10 +0000

This IC's is 57C5

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By: Vytas

Vytas — Tue, 10 Jul 2018 12:39:11 +0000

I have same issue with similar gadget. My IC's have first three digits 57C*, the last one is lost. Now i know that initially smd was market 57C5.
I found data sheet with it , but it was programmable temperature sensor, which is wrong. Any ideas what to replace in to?

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By: Humberto

Humberto — Tue, 25 Jul 2017 04:00:36 +0000

Good aticle Sir, you are a Master.

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By: Yogesh Panchal

Yogesh Panchal — Mon, 24 Jul 2017 08:28:46 +0000

Good job Sir,

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By: Suranga Electronics

Suranga Electronics — Mon, 24 Jul 2017 08:07:37 +0000

Mr. Parasuraman,
wow.. very good repair.
Thankas for this.

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By: Albert van Bemmelen

Albert van Bemmelen — Mon, 24 Jul 2017 06:25:15 +0000

In reply to Parasuraman.

Understood. But just in case you need a 6 legged charger chip... just found a very interesting link to all sorts of li-ion/charger chips including a 6 legged smd type LTC1734 on:
http://semtronics.net/shop/index.php?rt=product/category&path=133_140
and the link to that chip on:
http://semtronics.net/shop/index.php?rt=product/product&path=133_140&product_id=1014

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By: Albert van Bemmelen

Albert van Bemmelen — Sun, 23 Jul 2017 19:34:19 +0000

In reply to Albert van Bemmelen.

Apparently there exist different types of LA9010 ICs. I saw the wrong ICs with that same name and number (in DIP16 housing) on eBay:
http://www.ebay.nl/itm/LA9010-Integriert-Schaltungsgehause-DIP16-Machen-SANYO-/162421700581?hash=item25d11677e5:g:PhoAAOSwHxVW7seg
But don't get confused because I meant these Li-ion charger chips on :
http://www.s-manuals.com/pdf/datasheet/l/a/la9010_r01_inno.pdf
They have the same chip name but nothing in common.

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By: Parasuraman

Parasuraman — Sun, 23 Jul 2017 15:03:28 +0000

In reply to Albert van Bemmelen.

1) Charging current is well within the limits as the adaptor is safely rated. Moreover there are current limiting resistors. 2) I checked the time taken by the battery for full charge from a dim light situation and told the user not to charge more than that. 3) There was no way I can fix another IC in that board as it was charred! That is why I didn't bother about looking for any alternative!

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By: Albert van Bemmelen

Albert van Bemmelen — Sat, 22 Jul 2017 20:54:20 +0000

In reply to Robert Calk.

I forgot about that good link, thanks Robert. In this case Parasuraman also could use this 1 cell Li-ion charger chip la9010 with smd marking S2. Although it may not be pincompatible because it also only uses 5 pins. (but in the same size SOT housing). But I know that it is used to charge the 3.7V li-ions!

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By: Albert van Bemmelen

Albert van Bemmelen — Sat, 22 Jul 2017 15:57:26 +0000

Thank you Parasuraman. I understand that it was a 3.7V li-ion cell that is now charged without protection controller. It seems hard for the owner knowing how not to overcharge the Li-ion cell now. And if it gets overcharged it may be too late? (I take it that you did measure the ingoing charging current and the cell voltage?). The explanation of the 56x5 chip you gave is very hard to comprehend without a clear drawing of the circuit.
Of course I will keep a look out for the 6 pin smd chip that was burnt. Often the real component number is written just below the top number. The top number could as well just be a manufacturer's date.

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