I was given this tv and it was dead. I repaired many parts on the power board and now I get the relay clicking but no power to inverters. 12v is present where it should be, no 5 volts and all fuses on the power board and main board are ok. Green blinking LED (non stop) when you plug it in. Nothing happens when you push the power button, the reset button functions as it should. Appears it is stuck thinking it's in reboot mode. I can't find any help from the mitsubishi site as I have the only model listed without a firmware update. I'm about ready to turn this into trash, but I know somebody has been in this same situation and may have suggestions. I know an easy solution is to buy a board thats working, but that's too dang easy and I can't teach myself buy spending money when I'd rather eat BBQ!
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Re: Mitsubishi LT-40148 Blinking Green Light
You can start by uploading good clear pictures of the whole backside of the TV so we can see how all the boards are connected together, and then good clear straight shot of the power supply board for now to see what we are dealing with.Never stop learning
Basic LCD TV and Monitor troubleshooting guides.
http://www.badcaps.net/forum/showthr...956#post305956
Voltage Regulator (LDO) testing:
http://www.badcaps.net/forum/showthr...999#post300999
Inverter testing using old CFL:
http://www.badcaps.net/forum/showthr...er+testing+cfl
Tear down pictures : Hit the ">" Show Albums and stories" on the left side
http://s807.photobucket.com/user/budm/library/
TV Factory reset codes listing:
http://www.badcaps.net/forum/showthread.php?t=24809 -
Re: Mitsubishi LT-40148 Blinking Green Light
Thanks, loading a few up. The Model # LT-40148Attached FilesComment
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Re: Mitsubishi LT-40148 Blinking Green Light
Its most likely a bad main board. The green blinking LED according to Mitsubishi means that its trying to boot.Comment
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Re: Mitsubishi LT-40148 Blinking Green Light
Please list the pin name and Voltage reading on each pin of the connector PA and PB of the power supply board.
Pictures provided by shopjimmy.Attached FilesNever stop learning
Basic LCD TV and Monitor troubleshooting guides.
http://www.badcaps.net/forum/showthr...956#post305956
Voltage Regulator (LDO) testing:
http://www.badcaps.net/forum/showthr...999#post300999
Inverter testing using old CFL:
http://www.badcaps.net/forum/showthr...er+testing+cfl
Tear down pictures : Hit the ">" Show Albums and stories" on the left side
http://s807.photobucket.com/user/budm/library/
TV Factory reset codes listing:
http://www.badcaps.net/forum/showthread.php?t=24809Comment
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Re: Mitsubishi LT-40148 Blinking Green Light
PA:
Dimming 0.0
Bk Lght on/off 0.0
Inv Short. 3.2
Inv Relay. 0.0
Panel Pwr. 0.0
Gnd. Gnd
Pnl 12v Short. 0.2
AC off. 0.0
Main Relay. 3.6
PB
VA. 22.8
VA. 22.8
Gnd. Gnd
Gnd. Gnd
Panel vcc. 1.0
Panel vcc. 1.0
Gnd. Gnd
Gnd. Gnd
12v sl 12.0
12v sl. 12.0
Gnd. Gnd
Gnd. Gnd
Gnd. Gnd
All tested on dc with ground set on chassis.
I have a low to medium level of skill but understand the basics and bought a Oscilliscope a few days ago to help me figure things out better.
Thank you all for your time.Comment
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Re: Mitsubishi LT-40148 Blinking Green Light
Service manual:
Comment
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Re: Mitsubishi LT-40148 Blinking Green Light
I need to download the service manual to see what the normal Voltage of the 'AC OFF' pis should be. I believe it is the same as 'AC DET' as used in other TV manufacturer and is normally HIGH (>2VDC) for normal.
Right now the main board is not sending lots of command signals.Last edited by budm; 10-31-2015, 11:40 PM.Never stop learning
Basic LCD TV and Monitor troubleshooting guides.
http://www.badcaps.net/forum/showthr...956#post305956
Voltage Regulator (LDO) testing:
http://www.badcaps.net/forum/showthr...999#post300999
Inverter testing using old CFL:
http://www.badcaps.net/forum/showthr...er+testing+cfl
Tear down pictures : Hit the ">" Show Albums and stories" on the left side
http://s807.photobucket.com/user/budm/library/
TV Factory reset codes listing:
http://www.badcaps.net/forum/showthread.php?t=24809Comment
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Re: Mitsubishi LT-40148 Blinking Green Light
Thank you very much for the link, just what I needed.Comment
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Hi, this is my personal laptop, which the original board (lets call it Board A) blew up PU8700 (TPS51486), making a hole on the board, i had left the laptop at my desk one day with the battery fully charged and didn't touch it for a week, but when i tried to turn it on it didn't
Thought the battery was dead, so i plugged in the charger then tried to power on, the power LED blinked once, charged LED still orange, unplugged the charger, plugged in again and I noticed the "magic smoke" smell, so i unplugged the charger, removed the back cover and saw the blown IC (the "magic... -
Hi there,
I have this ASUS X453MA Laptop that's not turning on. When I plug in the charger, the green light just keeps on blinking and pressing the power button does nothing.
I have checked the charger and it is giving 19+ V
I have disconnected the battery and pressed power button for 30 seconds.
I tried another RAM stick.
Tried disconnecting the keyboard and touchpad.
Tried disconnecting the HDD and the wifi adapter.
The problem persists.
Hope you could help me out on this one. Thank you.12-14-2024, 06:40 AM -
Problem
This is an LG edge LED lit LCD Display. The LEDs are on the bottom edge of the display. There are 2 bars (left and right) Each bar has many LEDs and a 6 pin connector. Each pin drive several LEDs thus is the highest current flow / heat junction. The weak lead free solder gradually fails with thermal expansion/contraction cycling and increases resistance. PSU will compensate up to a point, then when the current is too high, PSU just shut down the backlight causing a dark display. I have even seen one which the connector just fell off as solder points became completely detached.... -
Hi
Im hoping someone might be able to give me some idea of what may be wrong with my Monitor Audio RSW12 Sub.
Ive owned it since new in around 2002, so would really like to keep it running if I can, it was the first ‘decent' bit of audio equipment I ever purchased and is a little sentimental.
The issue I had was that it would power up with the red light, but sometimes the green light would not come on and I would get no bass from it. If the green light did come on though, I would get sound out of it.
I have already tried replacing all of the... -
Hi
Im hoping someone might be able to give me some idea of what may be wrong with my Monitor Audio RSW12 Sub.
Ive owned it since new in around 2002, so would really like to keep it running if I can, it was the first ‘decent' bit of audio equipment I ever purchased and is a little sentimental.
The issue I had was that it would power up with the red light, but sometimes the green light would not come on and I would get no bass from it. If the green light did come on though, I would get sound out of it.
I have already tried replacing all of the...
Comment