Replacing LCD Tubes With LED Strips In HCT TV/MONITOR Model Number HLD-150MDP
This TV/Monitor was brought to me by my colleague in the hospital with the complaint that there was no display, but sound was ok. After opening and cleaning the inside, when I applied power and checked, I noticed that the LCD backlight was not getting on.
When I checked the connectors, I found one burnt. Thinking that it could be the reason, I tried soldering the wires directly to the board, but with the same result.
The LCD driver board is fit under the mother board and you cannot view it from top. So, I dismantled the set, opened the metal cover and located the two side LCD tubes, one of which had burnt out marks on the side.
As I have not done any replacement of LCD with LED strips, I carried it along with a few other sets to my Techie Friend, as explained in my previous articles. All the rest of the jobs were done by him. First he took out suitable LED strips and cut the length to suit the size. Then used an LED Driver to check whether it was working.
Then inserted the LED strips snugly into the groove on both sides where the LCD tubes were fit. Then wired it neatly, bringing out both ends so as to reach the place, where the LCD driver PCB was fit. Then applied power and checked with its screen placed. It was perfect!
Then reassembled the set to how it was before from the pictures that I provided to him and also took my guidance as I was the one, who opened the set. The LED Driver was fit in the same place where the LCD driver was, and stuck to its metal cover. After assembling everything back, applied power and Video Input and found the set was working very well.
This model has a DVD writer/player fit at the rear, apart from the connector to a Computer and Satellite TV. The DVD unit has to be slid out, and the connecting wires carefully removed like in any computer, by pressing the side locks in. (Unfortunately, I forgot to click this portion!).
The following picture was sent by my friend, after he took it to his home and played from the DVD. In fact, this is a very compact size with all the required features for home use. I really liked and appreciated it. My friend also was seeing a set of this type for the first time. He too admired at its performance and features.
So, another set was brought back to life, with the help of my Techie Friend, without failing to add satisfaction to its collection!
This article was prepared for you by Parasuraman Subramanian from India. He is 72 years old and has more than 30 years’ experience in handling antique equipment like Valve Radio, Amps, Reel Tape Recorders and currently studying latest tech-classes conducted by Kerala State Electronics Technicians’ Association. He has done graduation in BBA degree, private diploma in Radio Engineering and retired as MD of a USA company. Presently working as Consultant to Hospital and other institutions.
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You may check on his previous repair article below:
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Albert van Bemmelen
April 17, 2021 at 3:38 pm
Also your techie friends are real masters in fixing the most difficult tasks! I once also tried to replace the old backlight tubes in an older monitor by using a led driver board and 17 inch long led strips. But although the led driverboard was specified for DC voltages upto almost 30V DC, the driver chip got very hot and in just a couple of minutes went up in smoke! The same happened to very untrustworthy Lithium Battery charger boards also from China that only resulted in some exploding 18650 cells and a few not working 12V battery packs! So all I would like to know after reading this interesting repair is what module here successfully was used and what led strips are used? Because I gave up on doing the same with the now disassembled monitor and the very unsafe China driver boards!
Parasuraman S
April 17, 2021 at 6:23 pm
Sorry, I did not collect details of the driver board, as these are regularly and freely available in the market. I shall try to collect the board number and share it here. LED Strips are selected from my friend's collections. These are generally used for backlights in LED TVs/Monitors.
Albert van Bemmelen
April 17, 2021 at 10:36 pm
It looks like this Led backlight driver board was used with smaller coil?
Yogesh Panchal
April 18, 2021 at 5:39 pm
Albert,
I think in monitor LED Drive voltage should not more than 12V.......
A van Bemmelen
April 19, 2021 at 4:23 pm
I completely agree with you Yogesh that therefore they shouldn't sell those Led driver boards by telling us that these work upto about 30VDC which they clearly will not survive!
Parasuraman S
April 18, 2021 at 11:33 pm
Thanks for the link!
Parasuraman S
April 18, 2021 at 11:35 pm
I saw the link. Looks like that is what was used. This monitor has a 12V supply.
William
April 18, 2021 at 1:40 am
Well done! Clever fix. Details would be a help before venturing into this myself.
Thanks!
Parasuraman S
April 18, 2021 at 11:35 pm
Many thanks!
Waleed Rishmawi
April 18, 2021 at 2:19 am
Very interesting article and repair. I tried to do the same on an LCD computer monitor and worked fine I never tried it on a tv before. Thanks for sharing
Parasuraman S
April 18, 2021 at 11:36 pm
Many thanks! Yes, you should try it. It is very interesting!
Yogesh Panchal
April 18, 2021 at 5:28 pm
Good Repair! Sir
Parasuraman S
April 18, 2021 at 11:36 pm
Many thanks!
lynn blakely
April 20, 2021 at 12:28 am
Parasuraman S: Thanks for the repair notes. It's good that you have repair friends they are to be commended. Thanks for everyone that comments as they are friends, in other parts of the world. It is a blessing the Justine has this resource for technicians.
Humberto
April 30, 2021 at 12:35 am
Smart solution. Lamps are no longer available in market.