Polaroid FLM-2601 - Power Supply keeps blowing fuse

[budm]

Re: Polaroid FLM-2601 - Power Supply keeps blowing fuse

The part that failed is the MOSFET, the cap is OK. I think Tom is asking for the P/N of that MOSFET.

[drpj23]

Re: Polaroid FLM-2601 - Power Supply keeps blowing fuse

Oh ok, I had mentioned the p/n of the mosfet in an earlier post so that's why I put that.....I was confused lol.
But 11N60C3

[budm]

Re: Polaroid FLM-2601 - Power Supply keeps blowing fuse

You can get it from Mouser:
http://www.mouser.com/Search/Refine....eyword=11N60C3

Or Digikey.

[drpj23]

Re: Polaroid FLM-2601 - Power Supply keeps blowing fuse

Alright cool. I'll prob stay with Digikey.
Thanks for the help.
I'll order those and tell you the results.....actually I just found a board in my "trash" pile that has those (proview p/s). I'll test those out and try em.

[drpj23]

Re: Polaroid FLM-2601 - Power Supply keeps blowing fuse

Well my eyes tricked me and they are 11N80C3 but I was wondering if that would work maybe? or at least temporarily to see if that was a problem.
11N60C3 is VDS 650V RDS .38 ohms ID 11A
11N80C3 is VDS 800v RDS .45 ohms ID 11A

[multimeter]

Re: Polaroid FLM-2601 - Power Supply keeps blowing fuse

Well my eyes tricked me and they are 11N80C3 but I was wondering if that would work maybe? or at least temporarily to see if that was a problem.
11N60C3 is VDS 650V RDS .38 ohms ID 11A
11N80C3 is VDS 800v RDS .45 ohms ID 11A

the 80c3 will be fine ,as long as the lead spacings are the same

[ben7]

Re: Polaroid FLM-2601 - Power Supply keeps blowing fuse

Dont go with lower D-S voltage, or else they might fail in the near future.

[drpj23]

Re: Polaroid FLM-2601 - Power Supply keeps blowing fuse

Well the power supply stopped blowing the fuse
...but the TV now wont come on but at least there is a red stand by light.

Well I am about to open it up so I'll be back and if anyone knows specific things to look for that would be great.

Oh and thanks for all the info and help...this will def help with the Philips power supply I have....which also keeps blowing the fuse

[budm]

Re: Polaroid FLM-2601 - Power Supply keeps blowing fuse

OK, at least now the 5v standby power supply is getting the power.
Next we need to find out if the PFC circuits is working or not, check the DC voltage on that big DC filter cap in the primary circuits when the TV is OFF and when you turn on the power switch.
It should be about 170vdc when TV is off and about 400vdc when TV is on.

[tom66]

Re: Polaroid FLM-2601 - Power Supply keeps blowing fuse

I would check the PSU output voltages. If they are low, the problem is probably with the PFC voltage being too low.

[drpj23]

Re: Polaroid FLM-2601 - Power Supply keeps blowing fuse

Alright, The tv will turn "on" for about a few seconds but the standby light just turns off when this happens instead of changing colors. There are 4 red wires, 4 black (ground), and a purple and brown (standby).

Standby:
There is only a quarter of a volt on the red and 161.6v on the cap

On:
The voltage on the red wires do not change but there is 5v on the purple wire.
The cap had 386v

[ecking767]

Re: Polaroid FLM-2601 - Power Supply keeps blowing fuse

Well the power supply stopped blowing the fuse
...but the TV now wont come on but at least there is a red stand by light.

Well I am about to open it up so I'll be back and if anyone knows specific things to look for that would be great.

Oh and thanks for all the info and help...this will def help with the Philips power supply I have....which also keeps blowing the fuse

Hey drpj23, I have done work before on FLM-2601 power supply and I found the schematic for the power supply. I know this will help you. If you need this file in PDF format let me know

ecking767

[budm]

Re: Polaroid FLM-2601 - Power Supply keeps blowing fuse

OK the PFC circuit is working (the voltage on the main cap jumps to 386V) and so as the PS_ON signal. So next thing you need to find out if the 24Vdc output is working.

[drpj23]

Re: Polaroid FLM-2601 - Power Supply keeps blowing fuse

Ok, I couldn't get anything when it was cutting on and off by the button.
So to jumper it would pins 1 and 2 need to be connected? Just want to make sure.

And thanks ecking767 for the schematic, a pdf would be great.

[budm]

Re: Polaroid FLM-2601 - Power Supply keeps blowing fuse

Yes, jump 1 and 2 will force the power supply to stay on. The diagram makes it so much easier to troubleshoot. But just to be sure you should trace out the connections on the connector to make sure it matches the diagram, just in case.

[tom66]

Re: Polaroid FLM-2601 - Power Supply keeps blowing fuse

It looks like the standby supply generates the power for the PFC when it is started up. Does the 386V remain reasonably constant or does it drop off? The Vcc for the controller is derived separately.

[budm]

Re: Polaroid FLM-2601 - Power Supply keeps blowing fuse

Please see the attachment explaining how it works.

[drpj23]

Re: Polaroid FLM-2601 - Power Supply keeps blowing fuse

Ok, the voltage on the cap remains constant but I have no 24vdc at all.

And wow, I feel like I know nothing after reading that lol.

[budm]

Re: Polaroid FLM-2601 - Power Supply keeps blowing fuse

OK , we now need to look at the SMPS IC and MOFET, but can you tell me which MOSFET you replaced as shown in the Diagram?

[drpj23]

Re: Polaroid FLM-2601 - Power Supply keeps blowing fuse

I replaced V906 and V907. The V907 is the one after the SMPS IC and I replaced it with a 80C instead of 60C.