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Equipment Repairs => LCD TV forum => Topic started by: Big Poppa Pump on August 12, 2012,00:28:03

Title: Samsung LN40A550P3F
Post by: Big Poppa Pump on August 12, 2012,00:28:03

Samsung LN40A550P3F

No Power // Flashing Red LED // Power Supply has no bulging capacitors.

Am I missing something here? What else should I check?

Thanks in advance.

Title: Re: Samsung LN40A550P3F
Post by: Big Poppa Pump on August 18, 2012,23:35:39

Anything at all?

Thanks

Title: Re: Samsung LN40A550P3F
Post by: jordan on August 19, 2012,02:32:18

Check or change
CM-804(1000uF/25V),806(1000uF/25V),807(100uF/50V),809(1000uF/10V),812(1000uF/10V),852(1000uF/10V),853(1000uF/10V),872(470uF/25V),873(470uF/25V),876(820uF/25V),881(820uF/25V)

Title: Re: Samsung LN40A550P3F
Post by: michael first on August 20, 2012,05:16:43

  Hi,after changing the capacitors as indicated by Jordan,if there is still no power try to turn on the backlights without the main board's control;depending on the psu model number you should manage to light up the screen by shorting some pins on the 2 connectors leading to the main.this way you can decide if the main is ok or not.   

Title: Re: Samsung LN40A550P3F
Post by: jimca007 on August 20, 2012,20:57:51

Remember after lots of sammy psu repairs you need to reset the eeprom it seems to lock out when low voltages from duff caps are detected