Standby Problem In Singer DVD Player Repaired
This Singer DVD player was sent to me for repair with the complaint of standby and after that went into “Off” mode. See the photo below:
Standby mode can be due to the power supply or the mainboard problem. If the flash rom is corrupted in the mainboard it can also cause standby problem. Usually the first section to check is the DC output voltages of the switch mode power supply. With visual inspection there were no faulty or suspected parts.
It seems that all components were good and intact. The DC output voltages seems to be unstable and this is why the DVD player was in standby mode. There were couples of suspected components in the area where the yellow arrow were pointed.
The filter capacitors were checked to be good and when I proceeded to check on the 2 pieces of S8050 transistors and 2 pieces of 1N4007 diodes , I was surprised that all of them were found to be leaky. See the photos below:
After the replacement parts was done and powered On, there was no longer problem with the DVD Player.
I inserted the disc and it was managed to play. See the photo below:
Conclusion- Sometimes, troubleshooting DVD player may not be that straight forward especially involving the program. This is because if the firmware of the flash rom is corrupted it can give all kind of weird symptoms such as auto eject, no light at the LCD display (and you though it was power supply fault) and etc. However, you still have a high change to repair DVD player by reading Humphrey’s ebook here. The ebook comes with his technical support. Any technical questions related to DVD player you can always email him for help. You can also check out Jestine Yong’s ebook in Basic Electronics Troubleshooting and Repair if you are beginners in the repair field.
This article was prepared for you by Suranga Bandara who owns an Electronics repair shop in Anuradapura, Sri Lanka.
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https://jestineyong.com/lg-32-led-tv-no-backlight-repaired/
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Parasuraman S
November 30, 2020 at 5:39 pm
An excellent expert job! Many thanks for sharing!
suranga bandana
December 1, 2020 at 10:16 pm
Thanks Mr.parasuraman
Albert van Bemmelen
November 30, 2020 at 11:17 pm
Good job and a good thing it was not a bad eeprom or flash rom firmware issue!
Eric Rice
December 1, 2020 at 8:46 am
What sort of test did you perform to determine the diodes and transistors were “leaky?”
Thanks,
Eric
HECTOR DELATORRE
December 1, 2020 at 10:13 pm
How did you test the transistor and diodes to know they were leaky?
Yogesh Panchal
December 6, 2020 at 3:53 pm
well done! for another successful repair.