Expert
Expert
(859) 609-2887
SERVICE/REPAIR OF TELEVISION AND ELECTRONIC...
Answer
Tried all the cable remote codes to operate the Samsung DVD-VR 357. Which code works with comcast...
(More)
Problem for Samsung DVD-VR357
My Samsung DVD -VR357 will not turn on.
By andersonbnb on Oct 18, 2009
My Samsung DVD -VR357 will not turn on. No display,or any indicaton of power or clicking. The fuse is good. Multimeter shows AC power going to fuse.
Comments:
Oct 18, 2009
- I kinda figured it was the Power IC, but I do not have the service manual to know the part number or where it is. I see two IC' that I think may be the power IC, (by the rear center Tx,.but I want to make sure before I order the part. I want to tear it appart once. I can replace it myself. I don't need to take it anywhere.Thanks.
Bill
Oct 19, 2009
- I don't think a bad capacitor could be the problem. If a capacitor was shorted it would smoke. If it was open, there would still be power somewhere. There is no high voltage transformer in a set like this. I expect there should be voltage less than 20 volts DC, when working properly. I already know that the problem is around the power supply, or the control circuit. I need some one who knows what IC is used to turn the power on, ane what voltage should be where on the power/control IC's.BA
Oct 19, 2009
- Sounds like I am working with someone who knows what they are doing. Thanks for your reply. I have a few other jobs I have to do first before I can get back to this DVD recorder. I will get with you if I need any more help. I did locate a schematic of the unit last night. I have not had time to study it yet. As you know, it is sometimes hard to know where a path goes when it goes off page.Thanks,
BA
Solution #1
posted on Oct 18, 2009
Hi andersonbnb! I will be glad to assist you in this issue. I got this problem as well with my dvd player, It wont turn on as well. the problem is with the power ic that regulates the power coming in to the system. you need to go to the nearest service center for parts replacement..
Solution #3
posted on Oct 19, 2009
a) check the 3A diode on the secondary of the transformer might be
shorted.
b) check if there is 5V on its output
c) if a is good no shorted diode on the secondary your main regulator is busted. it has a part number printed
d) might as well check/replace the resistor with a value of 150K
color code = brown- green -yellow, yours might be diferent
e) to test for voltages the negative probe (black) in the chassis
the one that have 4 pins is the optocoupler
you need to replace the one that have 8 pins on it
only if there is no voltage or short on the secondary side
sometimes it comes from the 12 v output supply , it triggers the main regulator
without the standby 5V your main regulator will not work.
with the complete markings or label .
transformer.it is controlled by an oscillator to produce output on the secondary.
it has also a start-up resistor maybe about 75K to 220K
shorted.
b) check if there is 5V on its output
c) if a is good no shorted diode on the secondary your main regulator is busted. it has a part number printed
d) might as well check/replace the resistor with a value of 150K
color code = brown- green -yellow, yours might be diferent
e) to test for voltages the negative probe (black) in the chassis
Comments:
Oct 19, 2009
- post the part number of the IC you are looking,the one that have 4 pins is the optocoupler
you need to replace the one that have 8 pins on it
only if there is no voltage or short on the secondary side
Oct 19, 2009
- the optocoupler is the one controlling the main regulator ( maybe 8 pins)Oct 19, 2009
- these optocoupler needs only 1.5V to turn on the main regulatorsometimes it comes from the 12 v output supply , it triggers the main regulator
without the standby 5V your main regulator will not work.
Oct 19, 2009
- if still in doubt, post the part number of the IC you see , and i will identify the IC for you.with the complete markings or label .
Oct 20, 2009
- the one you need to replace is the IC that is directly connected to the chopper primarytransformer.it is controlled by an oscillator to produce output on the secondary.
it has also a start-up resistor maybe about 75K to 220K
Solution #4
posted on Oct 19, 2009
If fuse is good by means of ohmmeter and a good reading, then either power supply is bad, or if you are getting power, then there is a faulty capacitor or high voltage transformer in the unit.
Comments:
Oct 19, 2009
- power supply is bad or burnt capacitor. More info on testing capacitors: http://www.scribd.com/doc/18047680/Capacitor-TestingOct 19, 2009
- If there is power from power supply to fuse and fuse to main control board, then test power to main display control and all the capacitors. 25-30 ohms and 5-6 volts of power to the components. If you find a power drop, write down the part number, you can find it at shopjimmy.com. They can easily be soldered off and back in. For more about capacitor testing see this site: http://www.scribd.com/doc/18047680/Capacitor-TestingPopular Solutions for Samsung DVD-VR357
Questions and Unsolved Problems for Samsung DVD-VR357
Do you recommend Samsung DVD-VR357?
Answer
Answer
I recorded a VHS to DVD-R. Regarding the title list, I entered Title 1 and want to know how to add...
(More)
Answer
Can you record from an older sharp video recorder (vl- a45) to the samsung vr-357? I would like to...
(More)
Answer
Have a 2 year old Samsung DVD-VR357 turned it on recently it accepted my DVD and then lost power,...
(More)
Ask our Experts
Browse popular Problems
More Common Problems
Most Common Problems for:
For Samsung DVD-VR357:
Top DVD Player Experts
Experience:
30 Years of professional repair and design.
Ask Me
Top TV Repair
Best DVD Players
Recommended by Owners
Recommended by Owners
