Memorex T3321

[Mark562]

I replaced two caps, 10uf 450v worked for a week, then heard a pop opened it cars were fine. I ordered new psu popped it in. The screen will not stay on have audio. It flashes on only for less the a second. What should I check next.

[Agent24]

Re: Memorex T3321

Photos please, would be great. Including photos of the old and new PSUs.

Where are the capacitors located that you replaced? (Do you know what their function in circuit is?) What were the original capacitors? What did you use for replacements?

Something going pop was probably something blowing. Maybe a fuse, maybe a component. Inspect the boards carefully for burnt components under good daylight.

[Mark562]

Re: Memorex T3321

Ok The Board is <img src="https://07c64c6ea680b4fd723b32b6563c24fa3e5fef68.googledrive.com/host/0By-2rqlHK3Ked3FsYkQyNTA5ZWs/2014624192321.jpg" style="max-width:100%" alt="Powerboard" />. I think it was part of the board that popped , i have a new one

[Agent24]

Re: Memorex T3321

Link doesn't work, please upload your photos to the forum, that way others can use them for future reference too - external links have a habit of eventually disappearing

[Mark562]

Re: Memorex T3321

Link doesn't work, please upload your photos to the forum, that way others can use them for future reference too - external links have a habit of eventually disappearing

ok Sorry, here you go

[Mark562]

Re: Memorex T3321

ok Sorry, here you go

i left out i havea new psu now

[Agent24]

Re: Memorex T3321

It looks like there has been arc-over between two tracks in that area. Did you clean it?
Can we get a photo of the other side of the PSU too, to see what is going on there?

Was the new PSU brand new or used? Can you post photos of it also? Preferably the inside of the whole set also.

With sound but no picture could be a backlight issue. Do you get sound even with the screen off, or does everything eventually stop? If you shine a bright light on the screen, can you make anything out? (works better at night) It could be the lights\inverter is bad but everything else is working.

[Mark562]

Re: Memorex T3321

Yea,i Cleaned It. Before IGot the New One. The New Is Used I Got It From Ebay. What Would Keep The Lamps Off .





the first two are the new one

[budm]

Re: Memorex T3321

Check the DC voltage on BK_ON (bancklights ON) pin of the CON4.

[Mark562]

Re: Memorex T3321

Check the DC voltage on BK_ON (bancklights ON) pin of the CON4.

what should it be the voltage

[budm]

Re: Memorex T3321

I need see the voltage when the TV is OFF and when the TV is on, it should toggle.

[Mark562]

Re: Memorex T3321

ok im going to check now

[Mark562]

Re: Memorex T3321

ok just tested from the con4 when off there is zero volts when i power up its 4.8 volts

[budm]

Re: Memorex T3321

OK, so it is getting the backlights ON signal OK. So the two 10uf 450V caps on the new board look OK.

[Mark562]

Re: Memorex T3321

well the backlights just flash really quick, yea there looking fine

[Mark562]

Re: Memorex T3321

how do you test the d10 diode, and what part might that play in the invert

[budm]

Re: Memorex T3321

I believe the D10 has to do with the standby power supply.

[Mark562]

Re: Memorex T3321

ok if this helps before the first board went bad, it worked fine i had changed caps, they were cheap ones , then it worked for three day and now in this spot stuck not sure where to go fromhere.

What circuit keeps the lamps on , why would the lights just flash on but not stay on

[Agent24]

Re: Memorex T3321

What circuit keeps the lamps on , why would the lights just flash on but not stay on

Probably a fault in the inverter circuit, or it could have a bad lamp(s). Maybe it doesn't like your new capacitors.

[Mark562]

Re: Memorex T3321

Any idea how to check inverter circuit