Mulja tv repair portal
Equipment Repairs => LCD TV forum => Topic started by: Turnip on October 11, 2012,13:03:31
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Hi Folks,
Note there have been several mails over the years about this set not firing up although S/by 5v was present.
Seems main board needs to switch PS relay to connect mains input to main, mains bridge recifier.
Had one in today with the usual problem where S/by 5v is present, but set won't turn on, and there are no obvious faults in the main power sector.
Wonder if anyone has yet sussed it.
Note - Another site has restricted (possible) solutions to this problem - Chris
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Hi Chris,
My notes say the main smoothing block is quite often o/c, and check all other electrolytics.
Keith
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Hi Keith, and thanks,
This one came in after cust reported loss of DVB channels, where a retune initially did the biz. Next time it was no go with S/by supply present, so was naturally suspicious of the Main board.
Power/Inverter seemed OK, so replacement Main ordered from Fleabay.
Checked M/cap and reads a little less than stated 300Mfd (284Mfd) with an ESR of 0,25 Ohms, so could be a prob - will advise after panel replacement.
Thanks again - Chris.
PS - As to the other caps, board looked so pristine with nothing brown or bulgy, so didn't bother - could be a mistake. Note that several other Quuq'ers have had a similar problem over the years, so guess it's not particularly unusual but no-one yet has given a 'Quuq' solution.