RLDED3258A-F another crap TV from RCA

[paulstef]

Re: RLDED3258A-F another crap TV from RCA

I ended up lowering the LED current to 117mA without seeing much difference, perfectly ok for me.

This decreased the stabilized core temperature to about 40C increase over ambient temperature. So in my 10C basement that means 47C.

Now the only thing left to do is to figure out how much money I can charge for spending 20h repairing a TV that costs new $200CAD. Well I guess sometimes it's not for the money. :-)

[bakesbrownies]

Re: RLDED3258A-F another crap TV from RCA

paulstef
I have the same board and problem. Looking to replace l1 inductor with a new part. Would a 47uH 6A part be acceptable?

[paulstef]

Re: RLDED3258A-F another crap TV from RCA

paulstef
I have the same board and problem. Looking to replace l1 inductor with a new part. Would a 47uH 6A part be acceptable?

The inductance looks about ok. 6A is well above what I measured .

[tommyg]

Re: RLDED3258A-F another crap TV from RCA

Well I'm glad I found this thread, I just wish I found it sooner. Now I don't feel like a moron for spending several hours trying to fix this shitty tv to no avail

[magictech]

Re: RLDED3258A-F another crap TV from RCA

Hello all. I'm new to this forum as a member but have been into electronics since the days of vacuum tubes and this thread is exactly on the subject I've been looking into. I picked up for a buck an RCA RLDED3258A with hopes to be able to put it in our small travel trailer. I was told " it has sound but no picture " and I've seen this before in these P.O.C. units and ,sure enough, it had one burned out LED back light. After tracking down and installing a replacement LED, I checked for any defective parts and all looked good. I fired it up and, after the normal wait , I got a bright flash from the LEDs but then nothing. I figured from this that the LEDs were good as well as the FET and L1 as it would repeat this every time I fired it up. I would like some advice as to where to go from here. Any ideas? Thanks. Bob

[budm]

Re: RLDED3258A-F another crap TV from RCA

You need to check the Voltage feeding the Anode of the LED string to see what it is when it flashes and when it goes black, and are you sure that there were no shorted out LEDs beside the one that burnt up and goes open circuit?
Did you verify that all the LEDs come on when you had the LCD panel apart after install the new LED?

[magictech]

Re: RLDED3258A-F another crap TV from RCA

It's after midnight here now but I'll do the check in the a.m. Yes, all LEDs flashed and I was able to test each LED with my meter on diode check. Each one glowed at equal brightness: no shorts or opens.