Re: Vizio L32 HDTV10A - Wont turn on

Hi, I am sorry I do not have an answer for you but I am having the same problem as you on my display. If you don't mind me asking. How were you able to trick the power supply to come up?

Hi I was planning on checking voltages on primary side of supply that is not currently producing any outputs on secondary side, with exception of 5vsb. I have read that one must keep about 20% load on a SMPS in order for it to function properly. My question is while I will have full load (main board) connected while testing will it be ok to unplug the inverted cables (my system has master/slave config)? I am assuming the main board would represent at least a 20% load. Any questions or comments on this is appreciated - Ted

Re: olevia 437-s11 power supply shock question

Thanks PlainBill I appreciate it.

Re: olevia 437-s11 power supply shock question

HI PlainBill, thanks for all the input. I just observered a strange occurence. While I was checking dc readings on the gate of a FET referenced earlier found in the PFC section the readings went like from 30vdc gradually down to 0vdc. Is that an indication of a bad cap?

Re: olevia 437-s11 power supply shock question

Thanks PlainBill, I am still checking voltages. I determined that All output voltages on secondary side are 0 with exception of 5vsb voltage. I determined that each of the transformers (3 on this board) have 165 on their primary and 0 on their secondary. I switch to AC measurement as well on the secondary side and found no activity. I read that sometimes you can monitor transformer activity with a DVM on AC. I am assuming that there is no chopping ocurring on the primary side to push-pull current thru the windings of the said trans....

Re: olevia 437-s11 power supply shock question

HI PlainBill, I tested the bridge rec for voltages. I first confirmed that on the AC-in + I got 120ac. I then switched DVM to DC and determined that on the out+ pin I got 165v dc. I thought I should get 320v dc is that correct? (I had the black lead on the out - pin.)

Re: olevia 437-s11 power supply shock question

Thanks for the reply PlainBill. I assume this means that dc voltages at the + term of the filter cap should be around 165dc. Does that mean I need to place the black lead of the DVM on the negative of the filt cap to check dc volatages past the b. rectifier?

Hi, I have been working on an olevia 37" LCD. The symptom of the tv is blue standbye light on, when you press the power button - nothing. I tried a dvd input no audio, no lcd panel activity with flashlight to indicated (bad inversion or ccfl). I assumed PS problem. I started with checking voltages to see if I am getting rectified dc after the bridge, if chopper trans has dc supply, and of course the output voltages on the secondary side. While I was checking i got a quick shock from touching a large heat-sink (bridge rec) on the primary side (largest sink visible in pic). I cut power discharged...