Repair Samsung LCD TV -Relay Clicks, Shuts Off, Won't Come On

DISCLAIMER - If you attempt to repair your own set, expect to void any warranty that might still exist.  If you do additional damage, it's your own responsibility.  Further, you are working with an appliance that is powered from you house mains.  There is risk of shock with the potential of death or serious harm.  Know what you are doing, and how to work safely with an electrical appliance.


Recently my 3+ year old 40" Samsung LCD TV started taking a long time to start up, with several cycles of relays clicking.  In searching the net I found that others were having similar problems.  Apparently, Samsung's power supply on several LCD models was somewhat under-designed, with four capacitors that slowly fail over time and which leads to the symptoms in the title.
There are several options for repair: 1) Take the set to a qualified repair shop (est $300 - $500). 2) Buy a new, replacement, power supply ($100 - $175). 3) Replace the offending capacitors ($4.00 - $15.00)

I chose option 3, spending $15.00 for a Samsung repair kit (contains 4-1000 uF, 25V, 105 degree C capacitors and "instructions").  If you want to keep the costs to a minimum, you can order an appropriate set of capacitors from Digi-Key or Mouser for about $0.65 each + s/h.

Tools you need:
Phillips screw driver able to reach recessed screws (about 1" deep)
Soldering Iron for general purpose electronic components.

Note: According to the Samsung repair kit instructions, this repair works with the following models:
LNT4042H
LNT4042HTX/XAA
LNT4053HTX/XAA
LNT4053HX/XAA
LNT4053HX/XAC
LNT405HAX/XAA
LNT4061F
LNT4061FX
LNT4061FX/XAA
LNT4061FX/XAC
LNT4061FX/XAP
LNT4065XF/XAA
LNT4066F
LNT4066FX/XAA


Step 1: Remove the Back of the Set



Place monitor face down on a cushioned table. Remove screws from cover and remove screws from the stand. (If stand is attached)

I have an optional wall mount setup, requiring removal of the wall mount hardware from the rear cover - a total of 4 screws.


Step 2: Disconnect and Remove the Power Supply

There are seven screws securing the power supply, as well as the various cable connecting to other components.  Remove the cables, remove the screws, and then lift out the power supply.
IMPORTANT NOTE - While capacitors are not particularly sensitive to Electrostatic Discharge (ESD), most of the components on the power supply and other boards ARE!  Take appropriate measure to avoid static discharge (grounding straps, etc.), or risk totally frying your set's electronics.  Should this occur, you're no longer facing an inexpensive repair.


Step 3: Identify, De-Solder, and Remove the Failing Capacitors



There are four electrolytic capacitors to be removed: CM812, CM811, CM817, CS806.  These are clearly noted on both the front and rear surfaces of the power supply's circuit board.  (If you need a tutorial on how to de-solder "thru-hole" components, there are both text and video available on the net.)

You will likely see that the four capacitors of interest display bulging caps, and may even be leaking material.  On my set, only one showed any leakage, but all four were bulging.  The circuit they were used in is marked at 5.4V.  Based on my readings in electronics, capacitors should, in general, be rated for a voltage that is at least double the planned circuit.  Given that the original capacitors are rated at 10V, it would seem to indicate that fudging a bit here can lead to premature failure.


Step 4: Solder-in the Replacement Capacitors
The capacitors are polarized.  This means you MUST pay attention to the positive and negative leads on the capacitors.  The polarity is clearly identified on both the capacitors, there is a stripe down the side of a polarized capacitor with the minus sign, and the circuit board (both front and back indicate the polarity).  Failure to match polarity is BAD.  At the best, the capacitors will fail, in the worst case, they explode, and I assume, don't do anything good to the circuit board either.


Step 5: Replace the Repaired Power Supply and Attach the Rear Cover




Replace your newly repaired power supply, connect the internal cables to the other components.  Re-attach the rear cover, stand (if used), or wall mount brackets. Attach the external cables (Video, Antenna, etc.).  And, finally, plug in the power cord.  If all has gone well, press the power button and you'll see your set power up as it did when it was new.

NOTE:  The photo of my working TV is NOT representative of the image!  The horizontal striations are an artifact.



Step 6: Other Resources
You may find the following useful:

Samsung LCD Power Supply Repair Kit - BN44-00167A
Samsung Replacement Power Supply - BN44-00167F
Digi-Key - www.digikey.com

source: https://www.instructables.com/id/Repair-Samsung-LCD-TV-Relay-Clicks-Shuts-Off-Wo/



Related Post:
LCD TV Backlight Repair From CCFL to LED
Samsung LCD TV on Off Issue DIY Repair Fix
Collection How to Repair TCL LCD/LED TV
Screen won turn on after thermal paste replacement ASUS ROG GL503VD Laptop
Transform Your LCD/LED TV Into a Hologram TV
Replacement LCD TV Stand
Using LEDs From an LCD TV
$10 LCD TV Floor Stand
Hide an LCD TV Behind Drywall

Comments

  1. RamyaMay 12, 2021 at 6:05 AM

    IFB Service Centre in Mumbai Television is an electronic gadget that provides entertainment to people and gives them relief from stress. For years TV has been entertaining people from a white screen. It has evolved into LED TV. Such a big transformation has been taken in these years. In the market there are many different types of TVs which people purchase according to their comfort. There is no house where we cannot find TV. Everyone has a TV. IFB washing machine repair in Mumbai It helps people to get updated by the news about the current situations going around the world, it teaches people the moral values of various things, emotions, nature, and animals, etc so these are the things which we get to see on a TV by different channels. Contact us: 8106660022, 18008918106.

    ReplyDelete
  2. RamyaMay 12, 2021 at 6:33 AM

    IFB microwave oven repair Centre in Mumbai Our service center is always ready to help you; you can contact us if there are any damages to your TV we will be pleased to help you we have a team of technicians who are experts and highly skilled in this profession we provide you doorstep service in 90 minutes after your call so that your problem could be solved whatever the problem might be we are ready to help you 24/7 in order to fulfill your demands and requirements. IFB micro oven repair in MumbaiYou can contact us for any of the queries you have. IFB washing machine repair in Mumbai Our technicians will be sent to you to help you and repair the damaged electronic appliances, not only television we repair washing machines, refrigerator, microwave ovens, Air conditioner, etc. Contact us: 8106660022, 18008918106.

    ReplyDelete

Post a Comment

Popular posts from this blog

How to learn the SMD 6 Pins Power IC

Image
How to learn the SMD 6 Pins Power IC  Lots of the new LED TV and Monitor is using the SMD 6 pins Power Supply IC. This Power IC size is small like a normal SMD transistor! Sometime we can't find where this power IC location. But sure that for the season repairer they will knew that is power IC. But that's not mean they know what's their power IC part number! So It is important to learn this information when repair the latest LCD & LED TV or monitor. Below is the location of power IC (U7001) for Sharp LC-32LE340M LED TV:  The Power IC body size looks like smaller than the SMD zener diode Z7007! This power IC marking code is IDP-606, did you guess what's the IC part number is? The answer is........ => R7731AGE ! Below is the proof: We must refer to their product specification manual to confirm that this 6 pins Power IC IDP is a R7731A. Other 6 pins power supply SMD IC: 1) OB2263 = 63xxx                ...
Read more

Collection How to Repair LG LCD/LED TV

Image
1. How to Repair LCD TV Auto Shutdown Randomly Model: LG 32LB9R-TB LCD TV Symptom: The TV will Auto Shutdown Randomly This is an LG 32LB9R-TB LCD TV. The problem was it will auto shutdown after 5 minutes or 30 minutes, sometime after 1 hours then power shutdown. When try to press again the TV power on switch, the Tv will directly shutdown again or after few seconds.  When using table fan to blow the Power Supply board (PSU), and using a piece of card board to block the wind blow to mainboard. The TV can last 2 hours still working properly. After that the table fan change to blow the mainboard and the card board block the PSU. The TV was shutdown just after about 8 minutes! This power supply board is an IP board, the part number is: EAY38637401. Even change the table fan blow the PSU, the TV can last longer to working! With this method, we know that the problem was inside the power supply board. So I can replace a working power supply board to solve this T...
Read more

Collection How to Repair TCL LCD/LED TV

Image
1. A TCL L43F3800A-MT07P Smart LED TV with Problem Cannot Boot/Start-up   Author: iFix A little busy recently, but someone send a Smart TV to me for repair, the TV model is TCL L43F3800A--MT07P. Symptom: The indicator LED light up, but it can’t boot/start-up. The voltage output from power supply PSU is normal, so give the judgement that the fault location is on the main board. For this TV main board, at the beginning, I can’t fix it yet. But recently I have learned more and repaired a lot, so I am already familiar with it. Remove the cover, and measure the power supply of all DC and LDO, all are normal. This TV, the memory model is Toshiba 5D1K, EMMC bad is a common problem, so I began to confidently deal with EMMC. There was a backup before, just take a piece of EMMC and write it offline through RT809H programmer. Power on the TV mainboard, and have a test, but still same problem! After power on, although the LED indicator light on, there’s no flicker...
Read more