Author Topic: Samsung LN40A550P3F (Read 4331 times)

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.

Mulja tv repair portal · « **on:** August 12, 2012,00:28:03 »

Big Poppa Pump · « **Reply #1 on:** August 18, 2012,23:35:39 »

Anything at all?

Thanks

jordan · « **Reply #2 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)

Mulja tv repair portal · « **Reply #2 on:** August 19, 2012,02:32:18 »

michael first · « **Reply #3 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.

jimca007 · « **Reply #4 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

Mulja tv repair portal · « **Reply #4 on:** August 20, 2012,20:57:51 »

Mulja tv repair portal

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