Re: Poloroid TDA -03211C- - - -Power Board IPOS 150 Ver. 1.8

Started back working on this and got a little bit further but stuck again in about the same spot you are... I eventually got my back light to turn on because I found a connection problem at the quick connect to the power board and to the back lights, it was damaged. Once it turned on for the first time it flashed then went black and the small LED began to blink. After messing with the connection some the back light would stay on completely...But once I got ready to put it back together checked it once more and the backlight...

Re: Memorex MLT3221 - No Power

Ok I'm stuck again.... All the components you list checked out fine...even the bridge on the other side of the heat sink...also the caps underneath the sink were fine too. Anymore ideas?

Re: Memorex MLT3221 - No Power

Thanks for all your info you have been a huge help. Sorry you gotta work wit me a lil bit I'm still in school learning the trait and this TV has been great practice so thanks again. Ok so now with the board, the main cap only read about 160. I went ahead and pulled D6 and D7 and they were both fine... I wanted to wait to see if maybe the main cap was the problem before I pulled the rest of the components. So does 160 sound right or should I still pull the other components?

Re: Memorex MLT3221 - No Power

The LCD is to dark to take a picture of it, the tv just looks off. When I put sun light on it, all you can see is a glare. But I measured the MOSFETs and was getting a 0v reading, which led me back to the fuse(F2). I thought I had corrected it but I guess not because it was blown. I checked the resisitor I replaced earlier (R55) and it had shorted again. Also I I found two 62 ohm resistors had shorted (R27,28). I replaced them all and they all shorted again. Any ideas?

Re: Memorex MLT3221 - No Power

I can't tell you for sure because my LED is off also but I think it's because of that D10 diode... The HER 303.... I found were a 47 ohm resistor was reading 4 ohms. I switched that out and now no more fuse getting blown. The tv turns on now but the picture is really dim. I managed to put the tv in sun light and play with the menu so I could adjust all the picture settings and none of them changed the display... Any ideas on wats wrong... There is no lamp like on other LCD TVs so I didnt know if it could be fixed or if it needs a new LCD screen

Re: Memorex MLT3221 - No Power

I checked the fuses on the board and found where F2 was bad. It took awhile to get a replacement but once I got it and stuck it in there, powered it on and the screen flashed for a quick second then went black again... After rechecking F2 it had blown again... So any ideas on why it's blowing the fuse.... Also since I was ordering a fuse I went ahead and just replaced those two Caps that u had mentioned

Re: Memorex MLT3221 - No Power

IPOS 150
REV:1.8
2006.11.25
200-P00-HM150H

Thse are the specs on the supply board. The Rev number is there... not sure which is the model number. Also i should mention that i could only find one fuse on this Tv....

Re: Memorex MLT3221 - No Power

I have had the same problem with the same tv. These posts were very helpful since I could just go straight to D10 and check it and that was my problem. I now have 5v across the connection and the tv will turn on. The LCD screen however will not. There is a little red LED light in the back that is on but I'm not sure what this indicates... Any ideas????