Read about:  Symptoms of an LCD Power Supply Problem

Swollen, Bulged, Bad Capacitor

The main cause of this power up problem are bad capacitors on your power supply.  The image to your left shows that the middle capacitor is bulged or swollen and that’s how you can identify if the capacitor is bad. See more bad capacitor images Most of the post I have read online haven’t shown a capacitor that has leaked, but obviously that would be another indicator for a bad capacitor.

Now, if your LCD set is still under warranty I would suggest to use it and let the professionals handle the problem for you.  But for the rest of the Samsung LCD TV owners that their warranty had expired and want to save some money, this would be the best route.  Mind me, when I fixed my power supply I didn’t have any previous experience on desoldering and soldering capacitors on a power supply board.  It was a good experience after all is said and done.

Here’s what you need for this DIY project: Screw driver, Soldering iron(40watts+), Desoldering braid, Soldering wire, and capacitors.

Now lets talk about the specs, capacitors hold 3 important value:

1. The capacitance measured in uF(micro farads) (ex. 2200uF), 2. Voltage (ex. 10v), 3. Temperature (ex. 105°C)

Important Notes:

Samsung’s power supply capacitors has 10v installed on the board and it is attached to a 12v  bus which is causing to bulged. (I’m not a Electrical Engineer but I do know if you put too much on something, its going to get bigger or burst! ^_^  And that’s why our LCD sets end up with bulged or leaked capacitors)


Look at the bad capacitor and get the right information from it, remember uF, voltage and temperature.  Mine, I only change 2 capacitors.   It needed two 2200 uF, when I first saw my power supply it was really easy to spot the bad caps.  Some Samsung LCD owners did went ahead replace all the capacitors on the power supply to make sure.  Now if you’re like me, an inexperience solder, I would not recommend changing all the capacitors because to me it was time consuming for a noob(newbie) like me ^_^.

Few things to take note, always make sure you have the right polarity.  Negative part is where the colored stripe on the capacitor.  If your looking at the image above, it would be the copper colored stripe.  And if you are looking at the two connector wire of the capacitor, the negative wire is the short one.  On placing it on the board make sure negative to negative and positive to positive.  By this time you will be ready for soldering.

How to Solder and Desolder (Youtube video) is pretty simple and it just need guts to do it   The total cost for this project is $40 (I had to buy a new soldering iron and desoldering braid) You can buy capacitors from radioshack but always remember uF, voltage and temperature(they are price from .40 cents to $5 each).

Here are the models that are known with this problem:

• Samsung LN-T##61F
• Samsung LN-T##65F
• Samsung LN-T##66F
• Samsung LN-T##71F
• Samsung LN-52A550P
• Samsung BN68-01024D
• Samsung LN40A630M1F (would not power up at all)
• Samsung LE40R88BD
• Samsung LN40A500
• Samsung LA40N81BD
• Samsung LN 26A450
• Samsung LA40R71BD
• Samsung LN-T4642H
• Samsung LN52A750R1F

(If you’re a Samsung LCD owner and have a different model number with the same problem, please let me know)

I just fixed my LCD set last night and all is working fine and turns on normally.   Power up delay and the rainbow background is gone .  I will update if there’s any other effect after installing that 2 capacitors.  This post is based from my own experience fixing my own samsung LCD set.

I will not take any responsibility if something wrong happens to YOUR LCD set after reading and taking this advise from non-professional DIY fixer.  USE THIS GUIDE WITH CAUTION!

See what Samsung has to say about this known problem with their LCD and Plasma TV sets.


Sources:
Fixing Samsung clicking sound on power up
Your Audio Visual Science Forum – Samsung LN-Txx61f/65f/66f

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