The backlight in my RCA L32HD32D is not staying on. I turn the tv on and can see the glow of the backlight and the message "Please Wait" will appear for a few seconds but then the screen goes black, but I have sound. I've put a bright flashlight up to the screen and can see a faint image. Just not a very bright one. Using the flashlight, I managed to go into the menu and reset the tv to factory settings. Since that didn't help, I decided to replace both the control and the power/inverter boards. Still the problem persists. Thought my backlight was faulty so I checked the voltage at each connection and have voltage when set is turned on, but loose it after a few seconds. This happens with the new and old power/inverter boards. Any ideas on what the problem could be and how do I fix it?
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Re: RCA L32HD32D no backlight
So you have replaced the power supply already? -
Re: RCA L32HD32D no backlight
Yes. I've replaced the powersupply/inverter board (power supply and inverter board are integrated as 1 board) and the control board. I'm reading voltage to the backlight for a few seconds when I first turn the set on, then it drops off to zero. Happens even when the back light is unplugd and I turn the tv on.Comment
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Re: RCA L32HD32D no backlight
Thanks for the link to https://www.badcaps.net/forum/showthread.php?t=9315 I've read that thread before but it didn't help me at all. That user didn't have sound as well as no picture. I still have sound and a picture, but my backlight isn't staying on and I'm trying to find out what is causing it.Comment
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Re: RCA L32HD32D no backlight
When you say the control board do you mean the main board?
If you replaced the power supply and the main board you must have a bad or broken CCFL.Comment
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Re: RCA L32HD32D no backlight
Yes. I've replaced the control (or main) board and the power/inverter board. I'm having the exact problem with the original and the replacement components. What is the CCFL?Comment
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Re: RCA L32HD32D no backlight
The CCFL's are cold-cathode fluorescent lamps that make the backlight in your LCD TV. They look like a smaller version of the 4' fluorescent bulbs you'd have in your kitchen. There are several of them lined up horizontally down the screen and if one or more is bad or broken it could cause the TV to go into shutdown.
You have to disassemble down to the panel and it could be tricky in order to see if all the lamps are coming on for the 1-2 seconds.Comment
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Re: RCA L32HD32D no backlight
Ahh. I've had it down to the lamps but did not remove or try and power the unit up to make sure all the tubes were coming on. I will try that. Where wold I look to buy some replacements if they're bad?Comment
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Re: RCA L32HD32D no backlight
Anyone know what size CCFL this RCA L32HD32D takes?Comment
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Re: RCA L32HD32D no backlight
The best way to know would be to measure them. You need to measure length and their diameter.Please do not PM me with questions! Questions via PM will not be answered. Post on the forums instead!
For service manual, schematic, boardview (board view), datasheet, cad - use our search.Comment
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Re: RCA L32HD32D no backlight
I can measure the length, but the diameter is a tad tricky cause these lamps are small. I just want to make sure I get the right one. I can get a CCFL's ranging in size from 1.8mm up to 3mm, with increments of 0.2mm in between. (ie.. 1.8, 2.0, 2.2, 2.4...) Would each different size use different voltages? Could I use another size that's not exactly the same as the stock ones in my tv?Comment
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Re: RCA L32HD32D no backlight
Problem with different sizes isn't voltage or current but that they won't fit. The clips will usually only allow 0.2mm each way. I use these cheap ebay calipers. Maybe you have a friend you can borrow some from.
http://www.ebay.co.uk/itm/150mm-ELEC...item43addbf6d3Please do not PM me with questions! Questions via PM will not be answered. Post on the forums instead!
For service manual, schematic, boardview (board view), datasheet, cad - use our search.Comment
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Hi,
I have a new Asus Zenbook S16, Model UM5606. Unfortunately, the keyboard backlight is too bright, even on the lowest setting. I have explored several ways now:
- kindly ask Asus for an adjustment - they basically told me to STFU and get lost
It is not possible, they say. Of course.
- tint the keycaps from behind - I have already tried that - it is kind of a last resort
- try to find out, how it is done, look at schematics - this is, where we are at.
- maybe get the BIOS modified somehow? This would be the best option but I do not know a lot about...02-24-2025, 02:03 AM -
this tv is throwing me for a loop. do samsung tvs no longer have the backlight self test feature built into the power supply?
i tested the backlight with my LED tester and it lights up both strips. one of them reads 100v and the other reads 63.7v.
unplugged mainboard from power supply but left backlight plugged in, and then plugged psu wall power in. expected to see backlights light up but see nothing.
according to how ive diagnosed in the past, this would almost always be a bad power supply. replacement power supply was cheap like 20$ from ebay. but still i get not even... -
Hello, I came here after finding some similar questions asked on other monitors and hope someone here can help me get an ancient Viewsonic VP230mp (23" 4:3 LCD) back to working condition.
First a little background, I have a background in computer and electrical engineering, and I'm smart enough to know I know nothing about LCD displays and how they work. For this topic I'm as green as they come.
When the display is turned on the viewsonic logo displays in the uppper left for 2 seconds then the screen goes black, the power LED is green (on) and when a computer is connected... -
Hello all,
Am trying to figure out this backlight issue with this A1990 Macbook Pro.
Tests performed:
There is no backlight even with a good screen.
Backlight IC is receiving the correct support voltages.
Fuse F8400 ok
Current sense resistor R8400 ok
Backlight IC is receiving 3.3V on enable pin.
Backlight IC receiving voltage from PPBUS_G3H, aprox 12.5V.
Backlight IC receiving 5V from PP5V_G3S
Backlight IC BKLT_SCL and BKLT_SDA both measure 0.545V diode mode to ground
I2C_BKLT_SCL and I2C_BKLT_SDA both measure... -
Hi this oldie had no backlight .after replacing caps on 24v rail ,
still no b/l this uses inverter type:1315 B1-16A,
im sure ive come across the same inverter in a samsung possibly le32r88bd ?
all t/x in board test ok ,so i fitted 15k and led to pin 4 of oz964gn ic
this allows protect to be temporary overridden.
b/l now comes on
but the left hand side of pic is gradually darker than the right side
i have the cct for the tv
but it does not have inverter cct.
i opened it up to inspect the ccfl tubes
and they dont have any...
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