lynx 2 battery issue but ok with power adapter, any idea?

[bdoi]

Hi

I have an issue with a lynx 2 which works fine with a power adapter but with batteries: nothing, the lynx doesn't switch on.

I replaced, mosfet, zener and C39 and C41.

I checked the voltage at batteries support pin on the mother board and it's ok around 9V.

So anyone with an idea which other part can I check?

 

thanks;)

[allthingsanalogue]

I have suffered with this 3 times with 2 remotes and a gameboy color recently and it turned out to be oxidisation in one of the positive terminals in the battery compartment!

 

Could be worth a try?

 

Andy

Edited October 19, 2018 by allthingsanalogue

[bdoi]

I have suffered with this 3 times with 2 remotes and a gameboy color recently and it turned out to be oxidisation in one of the positive terminals in the battery compartment!

 

Could be worth a try?

 

Andy

thanks but, no I have already checked that, there is no oxydation or corrosion on the terminals of the battery compartment

[+Stephen Moss]

Hi

I have an issue with a lynx 2 which works fine with a power adapter but with batteries: nothing, the lynx doesn't switch on.

I replaced, mosfet, zener and C39 and C41.

I checked the voltage at batteries support pin on the mother board and it's ok around 9V.

So anyone with an idea which other part can I check?

 

thanks;)

Replacing those part would not have solved the problem as they are all used regardless of the power source.

 

Could be that the switch contact in the power jack is defective. With the AC power supply unplugged check for continuity between the battery negative terminal and either the Anode of D10/D11 or pin 7 of U6. If it is open circuit then first check the power connector, pins 2 & 3 should be connected and thus read 0 ohms, if they are them you will have to trace the bad connection, the path from the negative battery terminal runs through L16, the power connector then L14 to to the aforementioned points on D10/D11 & U6.

 

The positive battery connection goes straight to the +ve supply rail so check continuity between that and either the positive terminal of C39/C41, the Cathode of D12 or TP15.

[bdoi]

Replacing those part would not have solved the problem as they are all used regardless of the power source.

 

Could be that the switch contact in the power jack is defective. With the AC power supply unplugged check for continuity between the battery negative terminal and either the Anode of D10/D11 or pin 7 of U6. If it is open circuit then first check the power connector, pins 2 & 3 should be connected and thus read 0 ohms, if they are them you will have to trace the bad connection, the path from the negative battery terminal runs through L16, the power connector then L14 to to the aforementioned points on D10/D11 & U6.

 

The positive battery connection goes straight to the +ve supply rail so check continuity between that and either the positive terminal of C39/C41, the Cathode of D12 or TP15.

Thanks Stephen, your help is really appreciate!

 

I checked the continuity between:

battery negative teminal -- anode D10 ok

battery negative teminal -- anode D11 ok

battery negative teminal -- pin 7 U6 ok

 

power connector pin 2--pin3 ok

 

battery positive teminal -- C39 ok

battery positive teminal -- C41 ok

battery positive teminal -- TP15 ok

 

but I didn't find D12, could you point me where I can?

 

thanks!!

[+Stephen Moss]

Don't worry about D12 I was just giving several locations along the positive supply that you could test to as I was not sure which would be the easiest to find.

 

From results you have given it looks like the batteries should be connected therefore it is not currently clear (barring flat batteries) why it would work on AC and not the batteries, if you have a PP3 battery and associated battery clip you could try attaching the PP3 across D11 and see if it runs from that just as a double check.

[bdoi]

Don't worry about D12 I was just giving several locations along the positive supply that you could test to as I was not sure which would be the easiest to find.

 

From results you have given it looks like the batteries should be connected therefore it is not currently clear (barring flat batteries) why it would work on AC and not the batteries, if you have a PP3 battery and associated battery clip you could try attaching the PP3 across D11 and see if it runs from that just as a double check.

no my batteries work fine with another lynx

I will try with a PP3 battery this evening and let you know the result.

Thanks again!

[bdoi]

I just checked pp3 battery on d11 and didn't work neither...

[+karri]

I once had a Lynx where the battery compartment was covered with some kind of salt layer. When you put in batteries the power went to short circuit the batteries through the salt layer. You could not see the layer but when you measured the resistance of the plastics you could see it was conducting.

[bdoi]

I once had a Lynx where the battery compartment was covered with some kind of salt layer. When you put in batteries the power went to short circuit the batteries through the salt layer. You could not see the layer but when you measured the resistance of the plastics you could see it was conducting.

I have checked several battery compartment and it's the same. And I checked that there is around 9V on the battery terminal on the motherboard so it doesn't came from the battery compartment.

Edited October 24, 2018 by bdoi

[bdoi]

So any another idea where can I check?