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I have a Toshiba 42XV545U LCD flat panel TV. Today the screen

Customer Question
I have a Toshiba 42XV545U...
I have a Toshiba 42XV545U LCD flat panel TV.
Today the screen when blank while ON and the yellow LED started flashing. If unplugged and re-plugged in the yellow LED flashes (like it should) then goes steady. When the TV is turned ON the green LED lights and after a few seconds turns off and the yellow LED starts flashing. It doesn't appear if the back light is turning on. Per the manual this means a fan is not functioning.
What is the fan part number? Are their other potential solutions?
Submitted: 6 years ago.Category: TV
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Answered in 5 minutes by:
5/11/2011
TV Technician: Tim Nolan, TV Repair Technician replied 6 years ago
Tim Nolan
Tim Nolan, TV Repair Technician
Category: TV
Satisfied Customers: 19,454
Experience: Factory trained TV repair technician. U.S. NAVY trained.
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Thank you for posting your question on Just Answer! I will be happy to help you with this problem. Can you please give us some more information so I can better answer your questions.

-Is the light flashing a code? (example 6 blinks pause 6 blinks pause repeat)
-How old is the unit?

Please give me this information and I will be happy to assist you further.

Thank you,
Tim Nolan
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Customer reply replied 6 years ago

Wow, pretty fast response.

 

It doesn't appear to be flashing a "code". It just flashes very periodically, like every one or two seconds.

 

The TV is about one year old. Great picture until today.

TV Technician: Tim Nolan, TV Repair Technician replied 6 years ago
Give me a moment to pull the service manual...

When you say about a year, do you know if its less than a year?

Tim
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Customer reply replied 6 years ago
Could very well be less than a year. I used some air miles from United and bought it sight unseen. Not the normal way I buy electronics.
TV Technician: Tim Nolan, TV Repair Technician replied 6 years ago
Ok well then I must first tell you that if it is under a year that you need to contact toshiba and get it repaired under warranty, anything we do further to try and fix it will void your warranty.

If its over a year and you want to try and fix this yourself, then we need to do some troubleshooting....you do have a fan error and what we would need to do is take the back off and see if we can verify the fan not spinning.

Let me know.

Tim
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Customer reply replied 6 years ago

I need to find when I purchased it as the warranty direction would be good.

 

If it was over one year how do I contact you to continue with the answer?

TV Technician: Tim Nolan, TV Repair Technician replied 6 years ago
If you need to get back to me what you do is login to justanswer.com and click on the my questions link in the top right, then click on this question and post a reply, I will be notified and respond asap.

Tim
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Customer reply replied 6 years ago

Okay, it is out of warranty and it is a model 46XV545U. I took off the back and found fuse F820 on the power supply board blown. The power supply board is marked PE0626 C and V28A00084501.

 

The fuse is a time delay 2.5A 5x20mm (marked T2.5AL 250V). The fan spins easily and even if locked I doubt would draw enough current to blow a 2.5A fuse.

 

The fuse that is blown does not appear to be the primary input fuse. I will see if I can find a fuse at my work otherwise I will need to buy off the internet (Digikey, Mouser, etc.) which will take a few days.

 

As this is a time delay fuse it usually means that there are surge currents, usually at initial turn on. This died during operation so I'm thinking I've got something bigger than a fragile fuse. What say you?

TV Technician: Tim Nolan, TV Repair Technician replied 6 years ago
Well I spent about an hour here trying to find a schematic for your set, wonderful toshiba does not appear to supply a schematic so I cannot even tell what that fuse does. All they give is a basic horrible flow chart that tells you to replace the main board or the power supply. Unfortunately we are flying blind here now....

Can you tell what circuit the fuse is in or what it is feeding?

Tim
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Customer reply replied 6 years ago

Okay, they do some really weird stuff in breaking out their power supplies. The fuse is near a STR-Z2589 (Q860) resonance mode power supply chip near transformer T860.

 

I'm having difficulty following the voltage regulation as it appears to be done on two boards. I'm guessing the STR-Z2589 is generating the 24V that goes to the video input / processing board (where video inputs are located). But the 12VLCD is also distributed from this board and so is the fan power.

 

There is a second board PE0563A / V28A000736A1 that appears to be generating 5V, 12V. In essence, we have two power supply boards but power is distributed on one board but might have been generated on the other.

 

I've ordered some T2.5A fuses that should arrive on Saturday or Monday (Denver doesn't have much in the way of component vendors). I do have a 3.125A fast blow and a 2A slow blow that I could try.

TV Technician: Tim Nolan, TV Repair Technician replied 6 years ago
I would try a 2A but not a 3.125.

Let me know.

Tim
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Customer reply replied 6 years ago

Okay Tim, I replaced the T2.5A fuse with a T2.0A fuse. It blew almost immediately.

 

The fuse appears to be on a +48 Volt line. With the blow fuse in place I've got +5V but the +12LCV & +24V are around 3V (fluctuates with my Fluke but without breaking out the o'scope I can't really tell).

 

The weird thing about the blown fuse is when open:

the input side of the fuse is around 49V

the output side of the fuse is around -35V (referenced to fan ground)

 

After a few seconds a relay kicks in and the fuse input voltage goes up to something like 68V and the output side goes to almost ground.

 

Another weird thing:

If I spin the fan (it is trying to spin with the 3V) before the relay kicks in it will keep spinning (not surprising). The weird part is I think the TV believes it working as the green LED on the front panel is lit solid and the yellow LED is OFF. The fan will continue to spin and the green LED solidly lit for many minutes.

 

Hopefully the correct fuses will arrive tomorrow or Monday but I'm thinking either my power supply board PE0626 C / V28A00084501 is bad (bad STR-Z2589 or the transformer it is driving) or the Load that it is driving is bad.

TV Technician: Tim Nolan, TV Repair Technician replied 6 years ago
So the power supply is putting out 68v on a 48v line?

Tim
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Customer reply replied 6 years ago

Tim,

 

I don't have schematics, but the fuse appears to be right close to the ac input. There are a couple of transformers (T820 & T821) and some TO220 diodes (D820 & D821)mounted on a heatsink and a huge 220uF 450V electrolytic cap (C820). I would expect this supply drives some serious current ~ why else would you use a 220uF cap and have diodes mounted to a big heatsink.

 

Thus, if the load is removed by a blown fuse the big cap would charge to the peak rectified voltage. When I remove ac power it takes many minutes for the voltage to drop at the fuse input, meaning there isn't much bleed current (i.e. bleed or discharge resistor).

 

What I really don't understand is the minus voltage on the fuse output side when blown. Maybe if there is something really inductive or ??

 

To make a guess, could this be driving the ballast for the CCFL or maybe is part of the ballast?

 

 

TV Technician: Tim Nolan, TV Repair Technician replied 6 years ago
If you read from the blown side of that fuse to ground for resistance what do you get?

Any way you can get me a picture of the area of this board? (if you can post a picture, please click the icon above, where you are typing, of the paper clip. This will allow you to upload a picture)


Tim
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Customer reply replied 6 years ago

Okay.

P1010327.jpg shows the section of the board with the blown fuse. The ac input is on the lower left corner of the board. The blow fuse is on the lower right just to the left of "TOSHIBA". The red ./ black / yellow wires are to the fan. The heatsink towards the bottom center is attached to two transistors (Q820 FCPF 11NGOT, Q821 FCPF 11NGOT) and one diode (D821 N2206) from left to right (I thought it was two diodes and one transistor).

 

P1010324.jpg shows the open back. The blown fuse is on the green board to the right with the fuse in the upper right. The second power supply board is the brown board to the left.

graphicgraphic

Customer reply replied 6 years ago

I followed the wires and believe this portion of the power supply drives the backlight inverter. I also found a web site the sells the boards in question [tvparts4less.com].

 

The backlight inverter is a Samsung part (per logo on the PCB) as is the LCD panel. Per the web site the Backlight inverter is a part number SSI460_22B01. It wouldn't surprise me if the backlight inverter is bad which might have damaged the power supply.

 

I've found another web site that has the Backlight inverter as a Samsung LJ97-01669A.

TV Technician: Tim Nolan, TV Repair Technician replied 6 years ago
If you read from the blown side of that fuse to ground for resistance what do you get?
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Customer reply replied 6 years ago

Tim,

 

Open side of fuse to fan ground is approx. 10.2M ohm.

 

If I measure 24VINV to ground I'm obviously charging some capacitors so the resistance is increasing with time. But it gets to over 1M very quickly.

 

Going with my troubleshooting skills:

I've got a blown fuse on my power supply that generates 24V and 12V.

The 24V goes to the backlight inverter and I don't know what else.

The 12V drives the fan and I don't know what else.

But no matter where these voltages go and what they supply the main processor only verifies they are present by the turning of the fan. So I would assume they are for functions not necessary for the operation of the processor.

 

Now I don't know why my fuse is blown. The power supply is a resonance mode switching design which makes troubleshooting difficult. If the load draws too much current, the transformer is damaged, the switching transistors or output rectifying diodes are damaged they all result in too much current draw at the primary side of the transformer.

 

From the fuse I can determine that this switching supply is somewhere in the 100 to 110W range (49V & 2.5A fuse). The items that I'm aware of that would require 24V or 12V and high current in an LCD TV are the backlighting & LCD panel IR heating. I would expect that both of these functions would be generated by the backlight inverter.

 

Switching power supplies can be very robust if designed properly. The same for the backlight inverter as it is also some sort of switching power supply I would assume.

 

Should I just replace both the backlight inerter and the power supply board and be done with it?

TV Technician: Tim Nolan, TV Repair Technician replied 6 years ago
Well replacing them both would seem to have a very good chance of solving the issue if you want to spend that money on it.

Without a manual and a schematic its really hard to do any definitive troubleshooting in the set. From what you are reading though it would seem as if the power supply is your issue here but I do see the possibility of that inverter being the problem too...really hard call.

Tim

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Customer reply replied 6 years ago

I think I'll wait until I get the correct fuses.

Then I'll disconnect the backlight inverter and replace the fuse. Apply power and see if I've got voltage regulation out of the switching power supply.

 

But from "tvparts4less.com" I can get:

Rebuilt backlight inverter SSI460-22B01 for $174 - $75 refund for my bad board

Rebuilt power supply PE0626C for $174 - $75 refund for my bad board

 

So for about $200 I can be back up and running. I just don't know anything about the vendor. I could just be trading one problem for a soon to be other problem.

 

I don't suppose you'll devulge who you buy your parts from.

 

 

 

 

TV Technician: Tim Nolan, TV Repair Technician replied 6 years ago
I have never used them before, no info on them either.....

I normally use www.encompassparts.com, sometimes shopjimmy.com as well as a few others but you have to have an account with my other ones, the two that i listed here are good though.

Tim
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Customer reply replied 6 years ago

Tim,

 

I replaced the fuse and disconnected the backlight inverter and applied power. Fuse blew within a minute meaning the power supply is bad.

 

I'll order a power supply but there is a connector that I've not seen and don't know how to disconnect. It looks like solid metal wires bridging between the two power supplies. It is in the center of the attached picture. Is it fixed on one side and disconnected from the other? Does it disconnect from both sides / ends? It looks a bit fragile and I don't want to damage it when installing the new board.

 

Thanks.

TV Technician: Tim Nolan, TV Repair Technician replied 6 years ago
Grab on those two sides and lift up, let me know if it doesnt come loose.

Tim

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