Re: Toshiba 49L621U - Backlight protection shutdown
Found out shop jimmy just got led strips back in stock should anyone need them. Thanks for ALL responses!!
Cardioman
Member
Last Activity: 01-24-2021, 07:11 PM
Joined: 08-28-2020
Location: Ohio
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Re: Toshiba 49L621U - Backlight protection shutdown
budm, Down to LEDS no screen at present. Ran each strip with tester while tapping each led. Found an intermittent led.Leave a comment:
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Re: Toshiba 49L621U - Backlight protection shutdown
Need 12 NEW LED strips Toshiba #4708-K49WDR-A1213K11 for 49L621U. Only found in Canada at $120. Set isn't worth it. Anyone have a complete set to sell or have a source? Thanks!Leave a comment:
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Re: Toshiba 49L621U - Backlight protection shutdown
budm, thanks for reply. measured the Dc current, injecting the led tester (with PS led connector disconnected ) into VLED1- and appropriate VLED+ line one at a time. then moving to next leg, (VLED2- & VLED3-) measured 29MA for the 3 legs. (28 leds per leg)Leave a comment:
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Re: Toshiba 49L621U - Backlight protection shutdown
budm, dont know right now but i can measure it next. What current does one leg take normally?Leave a comment:
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Re: Toshiba 49L621U - Backlight protection shutdown
JJanssen7, thanks for input! Plug in just main logic, and PS with LVDS cable off. Did momentary test over and over again watching leds. All light bright on flash. Is this valid to rule out leds or can these bad boys flash and still be bad thus shutting down the fet?? Does anyone have a source with stock on a set of 12 strips of leds (7 per) Toshiba 4708-K49WDR-A1213K11 LED Backlight Strips. Or equivalent ??Leave a comment:
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Toshiba 49L621U Led Tv Or Power supply
Looking for a Toshiba 49L621U service manual, or power supply schematic for a led set that uses Power supply/LED driver PK101W1230I. Would purchase if required! Thanks! -
Re: Toshiba 49L621U - Backlight protection shutdown
Can you power up set momentarily with power supply board and main board but without TCON and screen, to verify the leds are bad at full current of PS? I would think not! I haven't seen anyone due that before.Leave a comment:
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Re: Toshiba 49L621U - Backlight protection shutdown
So I pulled the panel and found as thought ALL leds are good. They light at about 19.2V for all strips. (7 leds per strip, 4 strips per set, 12 strips, 84 total leds) Have been looking at power supply disconnected. The 3 power mosfets (for leds) all look good in circuit, at least not shorted. I suspect the 28 pin SMD device HAI7207CPC which is I think the shutdown monitoring circuit. Of course I cannot find any datasheet for the device. I am leaning towards getting a power supply board. Anybody have any input. Again thanks for...Leave a comment:
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Toshiba 49L621U - Backlight protection shutdown
Have common flash of Toshiba logo and backlight shutdown. Set uses power supply / LED driver bd. PK101W1230I. I Measured power supply to main board connector. (at power supply connector P802) and power supply LED driver connector to LEDS. (P803) All measured to chassis ground.
At logo flash: All 16V lines (16V2, 16VA) = 16.8V & 16.2V, 5V1= 5.1V, ACD=3.34V, PWON= 4.05V, BLON= 3.35V, 5V1= 5.1V, DIM= 5.1V
Two readings, one at power on, second at logo flash: -VLED 1, = 6V/ 34V, -VLED2 = 6.6V/37V, & -VLED3= 6.6V/ 37V. +VLED (3 COMMON WIRES) = 66V/101V
Pulled PS led connector... -
Re: Service manuals available free
Looking for a Toshiba 49L621U service manual, or power supply schematic for a led set that uses Power supply/LED driver PK101W1230I. Would purchase if required! Thanks!Leave a comment:
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Re: New Members - please post your introductions here
I am a retired electronic engineer in medical electronics for 40 years. I reside in the Ohio area. Glad to be a newbie in the forum. Looking forward to asking technical troubleshooting questions.Leave a comment:
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