Hi dear friends welcome again,
I received a call from one of my Costumer regarding 32" micromax LED TV no light, Only audio present. Since present generation attracted much more on LED/LCD and curve TVs because of its HD clarity, compact & low power consumption design. Even technicians are updating the repair tips and technology to solve the variety of complaints which come to their work bench. My self as a technician keeps on upgrading the tips to support the Costumer for upcoming products on this latest technology. We always think up-coming technology and will get ready to repair the new things. Until the basics knowledge its very difficult to operate such costly equipment’s. Here I would like to thanks Mr Jestin yong from Malaysia, Kent liew Malaysia and Humphery kimathi from Kenya, for their great support and contribution on repair tips sharing in the web and their books are helped me a lot in operating electronic equipment’s.
Let us begin with the story now, TV is at my repair bench, when I switched ON there is no back light at all and is ruining with very good audio. When I deeply observed with the help of my external backlight using my torch I can able to see the moving images. By this experiment it is concluded expect backlight rest of the circuit & everything is fine along with good LVDS signals flow to the penal circuit.
Now my main concentration is back light LED driver circuit DC-DC converter. When I checked the output voltage I am able to read 120vDC.
Then question in my mind when supply voltage is reaching LED circuit then why LED series not turning ON?? Really It’s very simple logic.
Started to remove the screws of panel even though composed with number of screws as in below box.
Here is the secrete I am revealing, Usually in LED TVs light is illuminated through LED series parallel combination and which is powered by DC-DC Converter circuit.
Let us see the back structure how it looks when opened
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| LED SERIES AND PARALLEL COMBINATION AT BACK PANE |
Normally voltages range is from 80 volts to 160 volts depending upon the panel design & size. In this condition if any single LED failed or burned entire LED ckt will OFF this is due to open loop in the path. Based on this concept I started to hunt the faulty LED using my external DC Source.
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| Checking the condition of the LED by using external DC- Source |
Ultimately I got 2# Faulty LED mainly caused to break further current flow in LED Circuit. Now the next task is how to replace faulty LED??.I am really great full to Mr Jestin Young, who has shared how to repair such type of failure in his tips.
 |
| SHORTED THE DEFECTIVE LED PATH USING SOLDER LEAD |
Just I shorted the failed LEDs path by soldering and made a closed loop. This is done by using my external DC source and conformed all the LEDs lit and started Re- assembling the panel unit.
After re-build powered the panel through the TV hardware & nice to see fine picture even though 2# LED failed condition.
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| BLUE BACK CONDITION TV ON |
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| TV IS READY WAITING FOR VIDEO SIGNEL |
Regards
BASAVARAJ BM
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