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LCD TVs - LED
Samsung P2470HN low light lamps
Monitor Samsung P2470HN
Monitor Samsung P2470HN
8 Soluciones
21 Reparaciones
32
hace 5 años
hace 5 años
Hello, this TV-Monitor had the fuse, regulator 4506GEH and the transformer TM 08190 burned, after replacing them they turned on the lamps but with low light and obviously the image looks dark. The 15V are correct. I replaced the filters, without changes, I tried connecting one lamp at a time and they all have the same brightness. I do not have an oscilloscope with only a polyester. I have to suspect the transformer since I measured resistance in the original traffic and the readings are 1,100 and 2,400 ohms in the second winding which is the most overheated and in the new the readings are 1,300 ohms both.
The TV functions are correct.
Any help or ideas is welcome. regards
32
hace 5 años
Hi, thanks for your replies. I have not measured working frequency between pin 8 and 9 of the SEM2005, so I understand it works in 60-62 Kc. At the moment I don't have a herzimeter, I get one to measure and comment.
billy58 the measurements are of the secondary traffic (inverter).
Thanks and regards.
32
hace 5 años
Solved I replaced the R of 47K with a 36K (363 SMD) and regulated the preset minimally until I reached 62Khz and it was quite acceptable. Just in case I left the modification to cancel DCR and place a 4K7 resistor.
The TV is from a close neighbor so I will know if it has a defect.
Thank you for the help received and of course to the colleagues who posted about this topic that was very helpful.
Greetings.
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