Question about Samsung Televison & Video
If there are very faint picture in background, then the back light system is not working. That means that problem is either inverter powering the lamps with AC, main controller board managing the inverter, or PSU providing primary DC voltage to the inverter.
In your case the PSU was defective. The damage may have concerned more components apart the capacitors (resistors, more capacitors, solder joints etc.). Testing is done tracking voltage to inverter. The first thing to test is voltage to inverter from PSU. A general procedure is described here.
This test is done reading the DC voltage from the PSU to main controller. A malfunctioning controller board may not turn on inverter. Voltage in input and high voltage on inverter must also be checked. Voltages to check are 120VDC at CN801 on IP board (inverter power board) and DC B13V,B12V,B5V Voltages at BD105L,C1261,BD101 on PSU. For safety reasons testing with power on must be done by a trained person.
To make things easier, the whole service documentation has been uploaded here.
Here parts for this TV.
Posted on May 28, 2011
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Posted on Jan 02, 2017
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