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LCD to LED conversions?
OldLes:
I decided at long last to start this trial conversion on the Toshiba LCD TV/DVD Model No. 22DV713B. Does anybody have a circuit for the main PSU/inverter board (or the complete set). The PSU/Inverter has No. DPS-65TP-3 marked so I assume that is its number.
What I had not bargained for with this is that set only has two side mounted CCFLs like a laptop, so I will try mounting them facing into the thick diffuser glass (plastic) as a start. If that is too dim, I will simply remove the glass and try perhaps six strips of LEDs.
OldLes.
per:
Just for information. About 5 years ago I installed a number of LED in 3 defective 20 inch models (top & bottom). A transistor on the control line to activate a relay for the LEDs. (The 12v PSU was running in st.by.) All 3 TV is still running perfectly, now uses only 20W instead of 65W. The only broblem is: A little too dark picture, and in one of the models are the LEDs visible in small spots,(top & bottom) so I never tried it in a bigger TV.
per
ProDave:
Are LED's really any more reliable?
I once repaired one of those little 7" digital picture frame sets with freeview built in.
I was appalled to find the LED's were just wired as a series string, so one LED failing was fatal. What actually seemed to happen was the first failed LED went short circuit, thus over running the rest (as it was constant voltage not constant current PSU) thus ensuring the whole lot failed very quickly.
I replaced all the LED's (re soldered new ones onto the two strips) and had to re jig the PSU a bit as the replacements were lower current.
The set worked, but I sold it PDQ thinking the whole principle of it's operation was rubbish.
OldLes:
With all the protection circuits in sets these days, I am quite certain a commercial LED set will have over current protection built in. Maybe your picture frame was just an early carp design.
No circuit anybody for the Toshiba main PSU/inverter board? ( No. DPS-65TP-3)
Les.
markc:
Interesting idea & should be possible, but how will you control the brightness? The original inverter has a connection for brightness control!
Mark
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