| Electronics > Repair |
| Repair Panasonic PT-56LCX66 TV Power Supply Board LSJB 1206-2 |
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| SgtRock:
Greetings EEVBees: --Please see attached picture(s) of Power Supply Board LSJB 1206-2 from the Panasonic PT-52LCX66 I am trying to fix for a friend (I.E. no charge). I have checked everything visually and can find no sign of anything, the board appears to be pristine. Checking the resistors in situ with a DMM revealed only one definite problem. The Grey Red Green Gold Green resistor in the pictures which is 3/8" or 9.5mm long, should be 82.5 Ohms ± 0.5% is reading 8 Megohms. It connects directly to the 120 V power chord, white wire, wider plug blade. --So it looks to me like I will need a 1 Watt (or better) 82.5 Ohm ± 0.5% resistor. I have tried DigiKey, no luck. Mouser has them in 1/4 watt, so I could series parallel 4 of them easily enough, if that is acceptable. Any fault finding or advice, would be sincerely appreciated. Thanks again. "Measure twice. Cut once" Norm Abram 1950 - Best Regards Clear Ether |
| steve_w:
try futurlec http://www.futurlec.com/Res1W.shtml part no R082R1W futurlec are slow but reliable and its only 40 cents plus postage; plus a week or two for delivery. :-) regards Steve w |
| T4P:
--- Quote from: steve_w on March 13, 2012, 01:17:59 am ---try futurlec http://www.futurlec.com/Res1W.shtml part no R082R1W futurlec are slow but reliable and its only 40 cents plus postage; plus a week or two for delivery. :-) regards Steve w --- End quote --- 0.5% NOT 5% . |
| Psi:
Yeah, it's quite common for those large resistors between the high/low sides of a psu to die. I think they're used to bootstrap the flyback and they take quite a big wack everytime you turn the power on. The designers often spec a smaller wattage resistor than it technically should be because the resistor has plenty of time to cool down afterwards. We had quite a few psus die repeatedly (every 6-12 months) and they just needed a bigger wattage resistor. |
| nukie:
Are those caps a mix of Nichicons and Chemicons? |
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