Before you click “Buy Now” on a replacement TV board, you might be able to save time and money by giving the board a visual inspection. Whether it’s your main board, power supply, or T-Con, many internal TV issues can be spotted with your own two eyes - no expensive equipment needed.
While there will be times that there is no visible damage on a defective circuit board, sometimes there are clear signs of damage that can inform you which part is in need of replacement.
Here’s a quick and simple guide to properly inspect your TV’s circuit board, what warning signs to look for, and when it’s time to order a replacement from TVpartsToday.
Already know which part you need replaced? Here's a video on how to spot your part number so you don't order the wrong board:
Tools You’ll Need
Before starting, make sure you have these essentials on hand:
- Phillips-head screwdriver
- A bright light or flashlight
- Magnifying glass (optional but helpful)
- Anti-static gloves or wrist strap (optional but helpful)
- Camera (to take photos before disassembly)
Safety First: Unplug That TV
Never inspect or handle a circuit board while the TV is plugged in. Even if the power is off, stored energy in capacitors can still deliver a shock. Unplug the TV and let it sit for a few minutes before beginning your inspection.
TVpartsToday Tip:
Lay the TV face down on a soft surface like a blanket to avoid scratching the screen while removing the back panel.
Need some more pointers before you get started? Check out our helpful YouTube video below:
What to Look for on a Damaged Circuit Board
Once you’ve removed the TV’s back cover and located the board in question, it’s time to inspect. Here are the most common signs of board failure:
1. Burn Marks or Scorching
These usually appear dark brown or black and indicate something overheated or shorted out. Common spots:
- Around resistors or power transistors
- Near HDMI ports or other connectors
2. Bloated or Leaking Capacitors
A very common failure in power supply boards. Look for:
- Rounded, bulging tops on capacitors
- Leaky residue or crust forming at the base
Healthy capacitors should be flat on top and clean around the base.
3. Corrosion or Rust
If your TV was exposed to high humidity or had liquid damage, corrosion may appear as:
- Green or white powdery buildup
- Darkened or fuzzy spots on solder joints
Check near input ports and cable connectors - these areas are most vulnerable.
4. Broken or Lifted Traces
The copper lines that connect components (called traces) can lift, break, or crack due to overheating or poor factory soldering.
Use a magnifier and flashlight to look closely for:
- Gaps or cuts in the lines
- Lifted pads where components were once soldered
5. Cold or Cracked Solder Joints
Even a tiny crack in a solder joint can cause a part to stop functioning. Signs include:
- Dull or grayish solder instead of shiny silver
- Tiny ring-shaped cracks around a component leg
These are often fixable by reflowing or re-soldering - if you’re handy with a soldering iron. If not, replacing the entire part is an easy process!
6. Loose Connectors or Burned Plugs
Look closely at ribbon cable connections and plugs:
- Wiggle gently - they shouldn’t move or rattle
- Look for melted plastic, blackened pins, or burnt smell
These may indicate a surge or overheating issue.
Document What You See
Take photos of any damage you spot. This is helpful if you:
- Want to show a tech for a second opinion
- Need to match a replacement part later
- Want to contact TVpartsToday for board verification or troubleshooting advice
When It’s Time to Replace
If you find burn marks, swollen capacitors, damaged traces, or failed ports, it’s almost always safer (and faster) to replace the board rather than attempt a risky repair - especially if you’re not comfortable soldering.
TVpartsToday Tip:
Matching the part number is more important than the board number or TV model. Use your original part’s sticker number to find an exact match from our store. Struggling? Shoot us an email with a picture of your part: info@tvpartstoday.com
Order with Confidence from TVpartsToday
Once you’ve identified your damaged board, head over to TVpartsToday.com to browse:
- A huge supply of replacement boards from all the major brands
- Fast U.S. shipping
- Support from real repair experts
Need help finding the right part? Just send us a photo of your board and model number - we’ll take it from there!
Final Thoughts
Knowing how to inspect a circuit board is a great skill for any DIYer or TV owner. It helps you:
- Avoid unnecessary part replacements
- Confirm you’re buying the correct component
- Learn more about how your TV actually works
Remember, if the board looks damaged - don’t wait. Replace it before it causes further problems.
Need Help?
If you’re still unsure about the issue or need to replace a part, reach out to TVpartsToday. We can help you identify the exact cause of the problem and provide the right replacement part!
Would you rather watch a video? Check out our helpful Troubleshooting 101 playlist over on YouTube!
Would you rather chat with a seasoned repair expert? Head on over to our TVRepairHelp subReddit!
Need help finding the right board or part?
Call us at 930-212-1975 or browse our inventory online.
DIY-friendly parts, fast shipping, and expert support – only at TVpartsToday.