Author Topic: flir MK1 I3 not charging  (Read 4902 times)

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Offline pimpinge46

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Re: flir MK1 I3 not charging
« Reply #25 on: March 26, 2017, 11:51:27 pm »
Also let tell you about the history of the unit. I purchased it used a few weeks ago the guy told me it wouldnot charge and he thought it was the battery so he bought an aftermarket one. He did mention he lost the charger at one point and bought a new one (oem).i Was able to charge the battery externally by applying voltage to the red and black wires on the battery and they had no issues holding charge or running the unit. But it  strange that the oem will only charge in the unit now and not the aftermarket one.
 

Offline Fraser

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Re: flir MK1 I3 not charging
« Reply #26 on: March 27, 2017, 01:42:32 am »
Hiya,

the charge management datasheet contains all that you need to reverse engineer the iX series charge circuit. It is a pretty good datasheet unlike some :)

I attach relevant diagrams extracted from the datasheet which may be found here:

http://www.ti.com/lit/ds/symlink/bq24032a.pdf

The bq240xx series charge management IC is a pretty clever design. Here are the highlights......

1. It can tolerate up to 18 Volts on its input so it would not be damaged by the inappropriate use of a 12V adapter (most common over-voltage)
2. The IC automatically takes its supply from either the DC input or the USB socket
3. If neither the DC input nor the USB input have voltage on them, the IC goes into sleep mode whilst maintaining power from the battery to the system that it services.
4. There are two charge state output pins. 'State 1' is the fast charge indicator and 'State 2' is the charge complete indicator. Both are open drain FETS and can sink 15mA.
5. The IC uses a thermistor to measure cell temperature. A 10K NTC thermistor is the most common.

So what can we deduce form the above in your case.

1. It is unlikely that the IC was damaged by an over voltage at the DC input unless it exceeded 18V
2. The two 'State' outputs will be driving the Orange (Fast Charge) and Green (Charge complete) LED's, likely via a separate LED buffer stage to protect the IC from over-current on these outputs.
3. The IC goes into a sleep mode when no voltage is present on either the DC input or USB inputs. The drive to the two 'State' outputs will be removed and both should be off (Open Drain).
4. The Li-Ion cell should have a 10K NTC thermistor present in its package. If a 3rd party cell does not contain the thermistor and associated connections to the plug, it will not be charged.

You really need to take a close look at the drive circuit around the LED charge indicator and check that the two State outputs from the IC go to their 'off' condition when the DC power and USB link is removed from the camera. If they do not go to the off condition, the IC may be faulty or it may be seeing a voltage on its input pins.

I suspect that you will find a simple buffer circuit between the IC and the two LEDs. That buffer circuit may have been exposed to teh over-voltage and a component damaged causing the wierd LED behaviour.

I regret I do not have the spare time to reverse engineer the charge circuit for you. The datasheet will provide a pretty good guide, minus the LED buffer stage (if used). That buffer should be relatively easy to reverse engineer though and I remember a cluster of components near to the LED's so they may be what you are looking for.

NOTE: This IC uses a heat plate in the bottom of its package. It may only be removed safely using a hot air or IR rework station.

Fraser
 

Offline Fraser

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Re: flir MK1 I3 not charging
« Reply #27 on: March 27, 2017, 02:02:44 am »
Last bit of input from me for the moment.....

I have looked at my teardown pictures and ringed the two charge LED's that are adjacent to the DC input socket.
On the reverse side of the PCB, in the same location, there is a little cluster of components. I believe these may be involved with buffering the LED's but I cannot check this as my camera is re-assembled. This cluster of components and associated SMD multi legged component is where I would be looking for your fault first. First determine whether the cluster of components are connected to the the LED's. If so, it is most likely the buffer of which I speak and the cause of your problem.

Over to you........

Fraser
 

Offline Fraser

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Re: flir MK1 I3 not charging
« Reply #28 on: March 27, 2017, 02:13:06 am »
This may also help you....

Component marked 'KLA' may be the BAT54TW diode pack as detailed in the attached data sheet.

Fraser
 

Offline Fraser

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Re: flir MK1 I3 not charging
« Reply #29 on: March 27, 2017, 02:17:30 am »
Component marked 'AB' may be the Zetex BCW60B NPN transistor

AB is quite a common marking however but I would expect it to be a transistor so this looks a possible match.

Fraser
 

Offline Fraser

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Re: flir MK1 I3 not charging
« Reply #30 on: March 27, 2017, 02:23:24 am »
'AB' could also be more diodes but the circuit will identify which makes most sense in this application.

MMBD4448HTS Schottky

Or even a Zener diode !

MMBZ5226B Zener
 

Offline pimpinge46

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Re: flir MK1 I3 not charging
« Reply #31 on: March 27, 2017, 02:52:40 am »
Great thanks for the info!
 

Offline Fraser

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Re: flir MK1 I3 not charging
« Reply #32 on: May 22, 2017, 11:13:51 pm »
I recently purchased a faulty FLIR i7 as a little fun project camera.

The fault symptoms are intermittent operation and no battery charging...... I wonder which IC is responsible for power management and charging ?  ;D

I ordered the replacement BQ24032ARHLT IC and a spare from China supplier www.SICSTOCK.com. I will fit it once the i7 camera arrives. The IC is very inexpensive, but you do need a hot air station to remove and fit this IC as it is a 20-QFN-EP and has a soldered thermal plate for a heat spreader on its underside. 

Fraser
« Last Edit: May 22, 2017, 11:15:26 pm by Fraser »
 

Offline Fraser

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Re: flir MK1 I3 not charging
« Reply #33 on: May 22, 2017, 11:20:38 pm »
A job for my OKI hot air pencil me thinks  ;D

The IC is 20 QFN and measures 4.5mm x 3.5mm

Interesting to work with  :)

Fraser
 

Offline pimpinge46

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Re: flir MK1 I3 not charging
« Reply #34 on: May 26, 2017, 07:19:53 am »
I haven't had a chance to mess with mine in a while, hopefully thats your problem .. Keep us updated!!!
 

Offline Fraser

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Re: flir MK1 I3 not charging
« Reply #35 on: June 12, 2017, 07:46:19 am »
The i7 has now arrived with me.

Symptoms are....

Battery is New and FLIR OEM part, but fully discharged.
Camera will not charge the battery and no Charge LED lit
Camera will not switch on when powered by external PSU and with battery removed

Battery charged fine when charged externally. In great condition as only fitted in Feb 2017.

When battery refitted in camera the camera Charge LED lights
When camera turned on it boots fine but Charge LED remains lit orange.
At top left of screen the external power symbol is present even though no external power is connected.

Camera performs as normal but if the battery is left connected it will be discharged by the Charge LED that remains lit.

Looks like my i7 has a failed TVS diode and likely either the Power management IC or the Charging current sense circuit.

More when I have time to delve further within the unit.

Fraser
 

Offline Fraser

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Re: flir MK1 I3 not charging
« Reply #36 on: July 07, 2017, 06:10:55 am »
An update on my poorly i7

The TVS protection diode was not shorted.
There was 15.2 Ohms measured across the external power input and 0V rail.
The fault was in the BQ24032a Power management IC.

Not unexpected, hence why I had already bought a couple for this repair.
This is an IC that requires suitable SMT rework tools for its replacement.

New BQ24032a IC fitted. Camera now works as it should and battery charges.

Repair complete.

Fraser
« Last Edit: July 07, 2017, 06:23:38 am by Fraser »
 
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