Power board MLT166H

[LEEDASH]

firstly hi all,I'm sure there has been a post on here about this make of LCD technika had talks about this power board which it runs from mlt166h,can any one tell me what the main faults with this board.
Believe it or not was out for dust men shame to see it on landfill.

[LEEDASH]

Re: Power board MLT166H

Mlt666t is the board sorry

[tom66]

Re: Power board MLT166H

Main faults are typically bad caps, shorted diodes, for Megmeet MLT series PSU.

Best way to fix is to work through the schematic
http://www.tgohome.com/ServiceManual...&Search=Submit

[LEEDASH]

Re: Power board MLT166H

Cheers Tom,I just switched on the set and worked perfect,but when switching on and off again nothing,does that mean the caps are not doing there job ?

[tom66]

Re: Power board MLT166H

Check the PS ON signal. If that is missing when you attempt to power on, it's the main board; if not, it's the power board. It's unlikely capacitors would cause this but I know these boards have a latching error detect (once it triggers it will not reset until unplugged.) If that is mis-firing on power-off, then that could be a problem with the power board.

[LEEDASH]

Re: Power board MLT166H

So what should I test first,sorry what is ,ps ?

[tom66]

Re: Power board MLT166H

PS ON / PSON, have you tested such a signal before? Just like checking any voltage. You know PSON turns on the power supply outputs when it goes HIGH? Also goes under names of REMOTE, STBY, and rarely ON/OFF (not to be confused with backlight "ON/OFF"...)

[LEEDASH]

Re: Power board MLT166H

I may have check a signal before as you have helped me out in the past