polaroid flm-3234b no backlight or 24v

[mattstolte]

ok I have this polaroid, it powers on but no picture, it has 5volt stanby, then when I power it on the red led light goes to blue as its suppose to but no picture, so I checked and theres no 24v or 12v on the power supply, so I get mixed up here trying to figure out if that is the power supply problem or the main? cause I know the main takes the 5volt stanby and uses it to push the correct power to other places but theres no 12 or 24 v coming out power supply.

[budm]

Re: polaroid flm-3234b no backlight or 24v

You should read Basic LCD TV troubleshooting guide.

[mattstolte]

Re: polaroid flm-3234b no backlight or 24v

im still learning and I thank you for your help, I just don't learn very well reading I learn well by being told what to do and hands on, thanks

[CapLeaker]

Re: polaroid flm-3234b no backlight or 24v

how about some nice high res pics from top straight down, so we have something to look at?

[mattstolte]

Re: polaroid flm-3234b no backlight or 24v

[mattstolte]

Re: polaroid flm-3234b no backlight or 24v

im not getting 12v or 24v from power supply, so I don't know how to determine which to eliminate the main or power supply

[budm]

Re: polaroid flm-3234b no backlight or 24v

As explained in my troubleshooting guide, the 12V and 24V are turned on by the command signal (PS-ON) from the main board, so with simple logic, do you have PS-ON? that will be the first thing to find out.

[stj]

Re: polaroid flm-3234b no backlight or 24v

i'v seen that type psu, chances are ALL the caps are fucked - specially the ones jammed under the U shaped heatsink!!!

[budm]

Re: polaroid flm-3234b no backlight or 24v

http://www.shopjimmy.com/catalogsear...t/?q=FLM-3234B

[mattstolte]

Re: polaroid flm-3234b no backlight or 24v

bud I don't have a ps-on wrote on this power supply,,, the last 3 things is
stb
5vsb
5v
when plugged in I have the 5vsb for 5volts
then when I turn it on I get 5volts on all 3 of them,,, shouldn't the 5v standby go away once turned on? but it don't.. also I have delt with these polaroids a few times usually its bad caps, but I see no bulging or leaking caps on this psu

[budm]

Re: polaroid flm-3234b no backlight or 24v

STB = PS-ON, when TV is off it should be <1VDC, when TV is on it should be >2.5VDC and stays there until the TV is turned off.

[mattstolte]

Re: polaroid flm-3234b no backlight or 24v

OK well I got PS on then. But still not getting the 12 or 24 v so its gotta be power supply then just not putting out the proper voltage?

[budm]

Re: polaroid flm-3234b no backlight or 24v

Yes, so more likely you will need to replace a complete set of caps on that power supply board.

[mattstolte]

Re: polaroid flm-3234b no backlight or 24v

OK I have seen these power supplies with BSD caps but I don't see any bad ones on here.

[stj]

Re: polaroid flm-3234b no backlight or 24v

use an esr meter.

[budm]

Re: polaroid flm-3234b no backlight or 24v

Bad cap can look normal, you need to remove them and test the ESR and the capacitance. The bad part about this power supply is due to bad design with caps mounted inside the heatsink.