Samsung Syncmaster 732N LED conversion project - Page 1
Forum section: electronics / projects

author: Mikey5791
author_rank: Contributor
timestamp: September 23, 2020, 03:02:56 am
content: Hi,Yesterday i received this lcd monitor free but the owner says the backlight doesn't work anymore. I removed the metal case and tested the main and power board on an acer lcd monitor and the lcd display comes out fine, meaning the power board and inverter still in working condition. Now my plan is to replace the old non working ccfl tubes(upper 2 tubes and bottom monitor 2 tubes) to led bulb. I saw some online china seller selling led conversion kit but i couldn't get any info on the led by asking those seller. I wonder if those led are bright enough to light my monitor screen. Here is the linkhttps://shopee.com.my/355mm-LED-Backlight-Strip-Kit-For-Update-CCFL-LCD-Screen-To-Monitor-i.181059869.6210934918Btw, the led driver board has four pin out with color of red, yellow, yellow and black. Has anyone done these type of led conversion and kind enough to point out on which part of the power board i need to connect all the four pin out.My guess is the red pin out is for positive 12vdc, black pin out is the ground negative.Hope someone can share or suggest their knowledge to help me complete this project. Thanking in advance.

author: Fox_Alex
author_rank: Newbie
timestamp: September 26, 2020, 12:13:41 am
content: Share a good photo of driver PCB, maybe there will be visible by tracks.Some time ago I did a lamp-to-led conversion for Asus monitor. I just bought led stripes and did a driver myself. It worked good, but colors on display looked bad. I fixed it by some software calibration, but it newer got as good as it was with lamps. Maybe yours leds will be closer to lamps than were mine.

author: wraper
author_rank: Unknown
timestamp: September 26, 2020, 12:28:47 am
content: All these LED conversions are trash and completely ruin color reproduction since light spectrum from those LEDs is completely different from CCFL. Replacing lamps is still easier that doing LED conversion and has a way better result.BTW capacitors on the PCB don't look original, nor seem suitable to be there to begin with. Looks like general purpose stuff from some lowest tier brand. Seems someone did crappy recapping on this monitor. So likely fill fail after a few month of usage.

author: Mikey5791
author_rank: Contributor
timestamp: September 26, 2020, 06:58:21 am
content: Fox Alex,Fyi I have not bought the led driver board yet but am looking at info on how to connect those 4 wires. The led conversion kit consist of 1 led driver board, 2 strips of led and cable. The seller does not or unable to provide any useful technical tips on how to connect those 4 wires to my power supply board (integrated with inverter)Today I found little info of wiring diagram on 9 pin assignment at page 74 regarding my 17 inch Samsung monitor. (LS17PEA type) Refer this linkhttps://elektrotanya.com/samsung_732n_plus_932b_plus_932n_plus_ch_ls17pea_ls19peb_ls19pea.pdf/download.html#dlBut the problem is I do not know where the two middle yellow wires from the led driver board should connect to which pin on my power supply board. If you can help and guide me on where to solder which wires, I will gladly appreciate.wraper,The ccfl lamps have broken and blackened end which failed to light up and only one lamp can light up half way using an external ccfl inverter. The cost of getting three ccfl lamps replacement from ccflparts.com plus international shipping from US to my country in South East Asia is just too much to bear. Thats why I choose the less costly approach and plan to convert those ccfl to led lamp. Better reuse this old monitor instead of throwing to the dump. Just my two cent. Anyway, thank you for your helpful comments.

author: wraper
author_rank: Unknown
timestamp: September 26, 2020, 10:03:41 am
content: Dunno if $7.34 including delivery can be considered "too much"https://www.aliexpress.com/item/32818510142.html?spm=a2g0o.cart.0.0.4b243c00opPap4&mp=1LED driver you linked is trash. And even not considering that CCFL and LED backlights have way different spectrum, those LEDs are not even meant to be used as LCD backlight. Because of that their spectrum is much worse than normal WLED you can find in displays.

author: Mikey5791
author_rank: Contributor
timestamp: October 08, 2020, 01:50:31 am
content: Fyi, the led conversion kit arrived in two weeks time and i fitted the wiring accordingly.Voila it works! To be honest i am quite satisfied with the standard quality, even the brightness is adjustable.Well at least now i got a working monitor which is better than to dump it due to some failed ccfl lamps.I hope it will continue to work for many years to come.I sincerely thank those whom had provided constructive advice and kind suggestion so i can complete this interesting conversion.