How JustAnswer Works:
  • Ask an Expert
    Experts are full of valuable knowledge and are ready to help with any question. Credentials confirmed by a Fortune 500 verification firm.
  • Get a Professional Answer
    Via email, text message, or notification as you wait on our site.
    Ask follow up questions if you need to.
  • 100% Satisfaction Guarantee
    Rate the answer you receive.
Ask Pete Your Own Question
Pete
Pete, Electronic Engineer
Category: TV
Satisfied Customers: 15770
Experience:  Over 16 years of experience installing and repairing electronics.
30970729
Type Your TV Question Here...
Pete is online now
A new question is answered every 9 seconds

My 50" Samsung plasma has a blacked out screen but still has

Customer Question

My 50" Samsung plasma has a blacked out screen but still has sound. Model: S50HW-YB02. I think it could possibly be a blown capacitor, located left of the F5700 fuse.
JA: How long has this been going on?
Customer: Just happened this morning.
JA: What troubleshooting have you tried?
Customer: Turning it on and off. Trying to access the tv menu. Reset the cable box.
JA: What is the exact make and model of your tv? And how long has this been an issue?
Customer: Samsung 50" plasma...Model: S50HW-YB02. It just happened 12 hours ago.
JA: The TV expert can solve this for you. Anything else you want him to know before I connect you two?
Customer: No
Submitted: 4 months ago.
Category: TV
Expert:  Pete replied 4 months ago.

Hello,

If the capacitor is suspect, go ahead and replace it.

Let me know if that fixes the problem?

--------------------
Kindly rate my service 5 stars at the top of your question page if my answer worked so I am rewarded for my time; otherwise please reply back if you need further assistance.
Pete.
--------------------

Customer: replied 4 months ago.
I replaced both bulged capacitors. The tv still turned on with a black screen, but now there are about 100 red, green and blue pixels appearing. Not sure if this has anything to do with it, but one of the chips on the Y buffer board had an orange light that was lit.
Expert:  Pete replied 4 months ago.

The colored pixels (known as "sparkling") can occur if the voltage is not correct.

Did you use exact replacement capacitors?

Try adjusting the VSCAN voltage setting and let me know if that helps?

Customer: replied 4 months ago.
How do I adjust the VSCAN voltage?
Expert:  Pete replied 4 months ago.

There will be adjustable pots on the board which you can adjust, similar to this one:

Customer: replied 4 months ago.
The voltage of the capacitors is the exact same as the old one though.
Expert:  Pete replied 4 months ago.

The tolerances will vary; no two capacitors will be the same.

Expert:  Pete replied 4 months ago.

That is why the adjustable pots are present in the circuit.

Customer: replied 4 months ago.
I've tried to adjust the pots and nothing. There are no more little dots...just black now. I replaced the YBuffer boards as well.
Customer: replied 4 months ago.
Sometimes a scratchy white line or a shot of scratchy white light will appear when I turn it on...but no picture.
Expert:  Pete replied 4 months ago.

Ok, then something else is amiss.

Have you double-checked all connections?

Customer: replied 4 months ago.
Double checked and triple checked.
Expert:  Pete replied 4 months ago.

Ok, let me check if the other techs have any ideas on this...