Samsung 32" LCD TV LE32R51BD - Blue band on screen

[Jackplug 123]

Hi Guys,
while I am in the process of trying to sort my main tv Hitachi 32HXC01UB backlight problem,I am using a Samsung LE32R51BD that was salvaged from a recycle centre.It works ok except for a vertical blue band about 1.5" wide from top to bottom and its about 12 inches in from the right hand side of the LCD screen.Pictures attached to show fault.
I will also need to obtain the correct remote control,am using one of those reprogramable poundshop remotes at the moment.
Is there a cure,any info appreciated.
Cheers.

[dick_barton]

Re: Samsung 32" LCD TV LE32R51BD - Blue band on screen

If you flex the top of the set, but carefully, does it change. It looks like a tab problem but hopefully I'm wrong. It would be worth your while doing a search on this site for Tab related problems and see what comes up.

[comptek]

Re: Samsung 32" LCD TV LE32R51BD - Blue band on screen

had that before but horizontal its like its bleeding it doesnt go right to the top so maybe not tab bonds

[ReeceyBurger123]

Re: Samsung 32" LCD TV LE32R51BD - Blue band on screen

I dont think its a tab bond issue but the Lcd glass its self. I have seen the foils in the glass become warped and the tft connections breakdown due to ages and heat etc and you get artefacts like this. Maybe try the tab bonds if not use the bacon method lol

[Jackplug 123]

Re: Samsung 32" LCD TV LE32R51BD - Blue band on screen

Tried flexing the top of the set and applied gentle pressure to screen in affected area,no change though.I assume the tab bonds become detached over time, I dont have a lot of experience with lcd screens so bear with me, although I have repaired several lcd computer monitors with faulty caps in the power supplies.Is there a cure short of replacing the LCD screen?
Cheers..

[ReeceyBurger123]

Re: Samsung 32" LCD TV LE32R51BD - Blue band on screen

Did you see my post about the bacon trick ?

[Jackplug 123]

Re: Samsung 32" LCD TV LE32R51BD - Blue band on screen

Yes, but what is the bacon trick lol?
BTW thanks for your tuts on you tube, made taking the Hitachi apart to get to the LEDS less daunting.
Co incidently in your area tomorrow, Oakengates and Wellington, taking part in a CAMRA event for real ale.

[ReeceyBurger123]

Re: Samsung 32" LCD TV LE32R51BD - Blue band on screen

Ahh yeah if you want to come down I can give you some Leds for free if you want ? I go to college in Wellington. Also check on youtube for the bacon trick Tv repair

[Jackplug 123]

Re: Samsung 32" LCD TV LE32R51BD - Blue band on screen

Hi Reeceyburger,
Thanks for the offer of the LEDS, I bought 10 0.5 watt smd leds off Ebay as a gamble but they are are a tad too large but only cost a couple of quid.Have got a 9 LED strip cut in two also off the bay arriving tomoz/satdy.
Should be in Wellington around 1pm fingers crossed but a quick spin around 4 pubs to get the Mild in May stickers as well as 3 more in Oakengates.
Getting back to the Hitachi, I get 37 volts LED supply off load before the voltage dies to zero,just hope the FET and LED array chip are OK.24 volt rail is OK.I can sort the FET but don't have a hot air station, just an Antex 24 volt 30 or 40 watt thermostatic station but with a good selection of tip sizes.Piss poor eyesight dont help either !

[ReeceyBurger123]

Re: Samsung 32" LCD TV LE32R51BD - Blue band on screen

Hi Reeceyburger,
Thanks for the offer of the LEDS, I bought 10 0.5 watt smd leds off Ebay as a gamble but they are are a tad too large but only cost a couple of quid.Have got a 9 LED strip cut in two also off the bay arriving tomoz/satdy.
Should be in Wellington around 1pm fingers crossed but a quick spin around 4 pubs to get the Mild in May stickers as well as 3 more in Oakengates.
Getting back to the Hitachi, I get 37 volts LED supply off load before the voltage dies to zero,just hope the FET and LED array chip are OK.24 volt rail is OK.I can sort the FET but don't have a hot air station, just an Antex 24 volt 30 or 40 watt thermostatic station but with a good selection of tip sizes.Piss poor eyesight dont help either !

No worries they are here if you want them for free lol also be sure to stop in at the Telford Dukes pub thats my mate Ian's fixed a few of the Tv's in there for him. Also 37v is not right, is that with the Leds connected ?

[Jackplug 123]

Re: Samsung 32" LCD TV LE32R51BD - Blue band on screen

Hi,will be visiting the Cock Hotel,Pheasant,William Withering and Wrekin Inn, will see if time permits the Telford Dukes.The voltage was measured with the 2 pin LED connector disconnected,at 3 volts per LED it should be 66 volts ?I have a thurlby PSU that is variable to 30 volts which is what I used the test the LED arrays.the one thats failed is next to the connector on the upper strip,so its gonna be tight to fit !

[ReeceyBurger123]

Re: Samsung 32" LCD TV LE32R51BD - Blue band on screen

Yeah, I know the ones you mean. Be careful in the cock you get some dick heads in there and thats not a pun lol.

Also 30v is not correct you should get 80v at start up then if its working should go to 68v when the Pwm kicks in. So your driver is not being turned on enough. Fix the Led first then see what happens bud. If its still faulty then will guide you on what to do next.

[Jackplug 123]

Re: Samsung 32" LCD TV LE32R51BD - Blue band on screen

Thanks
will do..
Can I test the LED array via the Hitachi PSU without reconnecting the TCON and LCD screen?
Just saves reassembling the bloody thing.
BTW still can't find the bacon fix unless you mean the 6 inch subway one..lol

[ReeceyBurger123]

Re: Samsung 32" LCD TV LE32R51BD - Blue band on screen

Lol, you dont need the Lcd or tcon connected to test the backlight it should fire on the booster.

[ReeceyBurger123]

Re: Samsung 32" LCD TV LE32R51BD - Blue band on screen

Here is the link as well might be worth a shot:

https://m.youtube.com/watch?v=nuOzmpUKTEY

[Jackplug 123]

Re: Samsung 32" LCD TV LE32R51BD - Blue band on screen

Novel way of fixing an LCD screen!
sadly not this time..

[Jackplug 123]

Re: Samsung 32" LCD TV LE32R51BD - Blue band on screen

Hi Reeceyburger..Update..4 u..
this morning..
I replaced the faulty backlight LED in the Hitachi 32HX****, ended up splicing a replacement with lens attached,getting the LCD surround on was a hairy,its now on soak test at the moment,5349 hours on the clock thats all down to me ! over two years.Are there any reliability mods I can do to the power supply board?LED backlight set to low,Dynamic contrast set to high..
I visited Wellington on friday all pubs ok except the Pheasant,crap customer service from the guy behind the bar.The Malt Shovel in Leegomery good as well.
Steve..