Hitachi P50H401 led flashes 3 times.

119501 Views 320 Replies 37 Participants Last post by georugby, Nov 19, 2013

Jason1976

Discussion Starter · Jan 15, 2011 (Edited)

I just picked this tv up today 50 dollars. In the power supply the two caps are swollen like my p50s601. One of the driver chips on the lower sdr board is burnt. If i unhook the sdr board then the tv powers up with the top half working. I am going to replace the two caps in the power supply and look into ordering the lower sdr board. in my p50s601 It was the top sdr that was bad now this one its the lower one. everything looks the same as the p50s601.

If you have this model check out my other tread with info about this model. http://www.hometheatershack.com/forums/hitachi/30302-p50s601-blue-power-light-flashing-3-times.html

click this link to see about the sdr boards and how to test the chips if you dont see burnt ones. http://ww2.justanswer.com/uploads/OriginalSeadog/2009-11-26_232005_DW3BufferICs.pdf

click this link for the trouble shooting flow chart. http://ww2.justanswer.com/uploads/O...55402_P50H401_Trouble_Shooting_Flow_Chart.pdf

another link showing you how to trouble shoot the sdr http://ww2.justanswer.com/uploads/O..._Trouble_Shooting_DW3-no-pix-troubleshoot.pdf

[/QUOTE]

This wont let me update the title. I forgot the H in P50H401

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lcaillo

· #301 · Feb 27, 2013

Start with verifying all connections, grounds, shields, etc. Check your supply voltages and if you can look at the supplies with a scope to see if there is noise on them. If you don't have a scope try measuring the a.c. on your d.c. supplies with a multimeter. This can sometimes reveal significant noise or filtering problems in a power supply. There should be little a.c. on your d.c. supplies.

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axleethington

· #302 · Feb 27, 2013

Dang this might be over my head here. I can check ground wires but as far as the other stuff I feel like I'd mess it up more ha.

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frank5351

· #303 · Jul 13, 2013

I was given this Hitachi P50H401. The guy told me it had a capacitor problem, so I went ahead and took it home not realizing the weight of 100 odd lbs, I had to get a carrier for it. Lucky I only live a block away. Anyways, this is my first plasma repair attempt. I have repaired quite a few LCDS in the past with good results. Once turned on, the blue light would flash twice then repeatedly 3 times. I opened the back and saw that one of the caps where swollen, I replaced both of them. Now the lower buffer board had a burned chip on it and I ordered it online and replaced it. The TV went on but I had black horizontal lines on the lower part. I want to thank the guys here for all the useful info. I was about to ask for a refund, then I decided to try and make sure I had installed the board correctly. It took me a few trys before the black lines went away. Now, I am a happy camper. This TV is absolutely an excellent set. Beautiful color and depth when it comes to black color. I am not sure what I will do with this TV, maybe sell it or buy a wall mount and put it in my living room. I already have a 43inch plasma that I bought less than a year ago. :bigsmile:

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KYBOSH

· #304 · Jul 13, 2013

frank5351 said:
I was about to ask for a refund, then I decided to try and make sure I had installed the board correctly. It took me a few trys before the black lines went away. Now, I am a happy camper.

:clap: :sn:

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///amg55

· #305 · Jul 21, 2013

Hi Guys,

I'm back with a 3 blinking light problem...

Its almost been a year since I fixed the bulging capacitor issue. Which gave the 3 blinking lights the first time around.

This time the TV had gray lines come on across the top. On and off for a while, then slowly got worse. Went away then came back and now the TV wont even start up.

I just checked the SDR-U broad and all the chips look fine. I checked the Ohm's with my multimeter and they seem to be all normal.

I did a visual check of my TV other components and they all seem fine.

Any ideas?

onder:

Is it my power supply?

My TV's a P50T501

Thanks in advance.

L

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Plasmajunkie

· #306 · Jul 27, 2013

Help Me Obiwan, I guess these models have the same issues.I was given a P50S with the surge damage.The tv would come on and flash full screen then it would go dark and the power light would flash 3 times constantly.Bought the 100V 3300uF cap's and installed them and now it doesn't flash and I can hear relays latching, fan's come on momentarily and the power light stays blue like it's working but no light on the screen now.I have a few meters and alot of ability Just a Jedi Needing a Master.Thanx

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lcaillo

· #307 · Jul 27, 2013

Start by measuring the dc voltages at the various boards and comparing them to the labels on the boards and set and the schematic.

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Plasmajunkie

· #308 · Jul 29, 2013

lcaillo said:
Start by measuring the dc voltages at the various boards and comparing them to the labels on the boards and set and the schematic.

I downloaded the manual and I'm sure I can go through the flowcharts.I bought a new meter to check Micro Farad's and it doesn't.Ebay for ya.Took a month to get the caps here.What messes with me is I would get a full screen flash.Now I don't get anything.I wont give up easily but if I do I have a P50s601 that looks like it just came out of the box.I need to check this thread more often.

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Jason1976

Discussion Starter · #309 · Jul 29, 2013

Plasmajunkie said:
I downloaded the manual and I'm sure I can go through the flowcharts.I bought a new meter to check Micro Farad's and the POS doesn't.Ebay for ya.Took a month to get the caps here.What messes with me is I would get a full screen flash.Now I don't get anything.I wont give up easily but if I do I have a P50s601 that looks like it just came out of the box.I need to check this thread more often.

I had the p50h401 and the p50s601 they are almost the same set. they are both known when those caps on the power supply go bad for frying a sdr board chip. there was a guy offering to repair the sdr boards not sure if he is still doing it. did you test the sdr boards?

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lcaillo

· #310 · Jul 30, 2013

Plasmajunkie said:
I downloaded the manual and I'm sure I can go through the flowcharts.I bought a new meter to check Micro Farad's and it doesn't.

The flowcharts may or may not be useful. The schematics and the labels on the connectors on the boards and the sticker on the back of the panel likely identify many of the d.c. voltages that can be checked with a simple DMM. Finding missing voltages can often be very revealing.

As for testing capacitors, measuring the capacitance in uF is usually not very helpful, particularly in circuit. The primary measure that is useful in finding bad caps is ESR. That, plus observation and measurements can often point to where a problem might exist.

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Plasmajunkie

· #311 · Jul 30, 2013

Jason1976 said:
I had the p50h401 and the p50s601 they are almost the same set. they are both known when those caps on the power supply go bad for frying a sdr board chip. there was a guy offering to repair the sdr boards not sure if he is still doing it. did you test the sdr boards?

Not yet, I watched the you tube vid on the damage done to the card but everything looks great.No signs of smoke and I had a full screen flash before I changed out the cap's.The flowchart's lead mostly to cards but there are references to card component's.I have a feeling about one thing I did.I'll let ya know if I made a rookie mistake.

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///amg55

· #312 · Aug 7, 2013

///amg55 said:
Hi Guys,

I'm back with a 3 blinking light problem...

Its almost been a year since I fixed the bulging capacitor issue. Which gave the 3 blinking lights the first time around.

This time the TV had gray lines come on across the top. On and off for a while, then slowly got worse. Went away then came back and now the TV wont even start up.

I just checked the SDR-U broad and all the chips look fine. I checked the Ohm's with my multimeter and they seem to be all normal.

I did a visual check of my TV other components and they all seem fine.

Any ideas? onder:

Is it my power supply?

My TV's a P50T501

Thanks in advance.

L

Update.

I fixed the problem a day later. It turns out that one of the caps I installed last year came loose. Bad soldering job on my part. Now it works just fine.

:boxer:

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chad_slider45

· #313 · Aug 15, 2013

I've been reading the thread and need a little help with Hitachi P50s601. Here's what I've done so far...
1. Taken off back of tv and found the 2 capacitors were swollen - bought completely new board from China came brand new and looks great - and installed new power supply.

2. Turned on TV, still blinks 3 times with a pause.

3. After watching a few youtube videos and reading this thread I
3.1 Unplugged top buffer, powered on tv, half screen was blank half was static then would shut off and go into three blinking blue lights
3.2 Did the same for bottom buffer, same result.

4. PM the youtuber asking for clarification on how to detect buffer board chip failure - haven't gotten a response yet...but his initial thought for my case is both buffer boards may be bad.

Any thoughts on whether he'd be correct re: both buffer boards being shot? Do I need to look at something else entirely?

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Jason1976

Discussion Starter · #314 · Aug 16, 2013

chad_slider45 said:
I've been reading the thread and need a little help with Hitachi P50s601. Here's what I've done so far...
1. Taken off back of tv and found the 2 capacitors were swollen - bought completely new board from China came brand new and looks great - and installed new power supply.

2. Turned on TV, still blinks 3 times with a pause.

3. After watching a few youtube videos and reading this thread I
3.1 Unplugged top buffer, powered on tv, half screen was blank half was static then would shut off and go into three blinking blue lights
3.2 Did the same for bottom buffer, same result.

4. PM the youtuber asking for clarification on how to detect buffer board chip failure - haven't gotten a response yet...but his initial thought for my case is both buffer boards may be bad.

Any thoughts on whether he'd be correct re: both buffer boards being shot? Do I need to look at something else entirely?

It's hard to tell. Could be a bad y sus board. Did you test the sdr boards there is info if you read the tread about testing the sdr boards. but if the tv comes on for a little bit when ether is unplugged it makes me wonder if it something else. It could even be a bad logic board. It's hard to tell what is wrong. I believe there was a service manual on here for this set. The p50s601 and the p50h401 are almost the same on the inside and use a lot of the same parts. there is a topic as well for the p50s601 as I have owned both sets.

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chad_slider45

· #315 · Sep 9, 2013

Jason1976, thanks for your thoughts on that. After reading your reply, I bought a logic board installed it, and still came on blinking 3 times. I hoped this would've all been resolved by replacing the power supply, but alas I'm left scratching my head.

What's the next logical conclusion now that we're here? Replaced power supply, logic board, what would be the next logical step?

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LizzieBathory

· #316 · Oct 19, 2013

Hi everyone,

My p50h401 had the exact same problem. My dad soldered in the new caps to the power supply board and reinstalled it last week, and the upper sdr board just came in the mail today. I put it in and left the back panel off the TV because I've read here that the ribbons will likely need adjusting. But my problem is, after plugging in all the wires again, the TV is not getting any power. The blue/red lights won't even come on. I've tried pushing the button on the bottom rim of the TV but that changes nothing. Does anyone know why that could be? My dad did mention that when he pulled the old caps off the board, he forgot to check if there were specific positive/negative posts, or if they fit it in any way. I'm puzzled. All of our other electronics are getting power so I know it's not the outlet. Thanks in advance to anyone who can help me!!

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chad_slider45

· #317 · Oct 21, 2013

LizzieBathory said:
Hi everyone,

My p50h401 had the exact same problem. My dad soldered in the new caps to the power supply board and reinstalled it last week, and the upper sdr board just came in the mail today. I put it in and left the back panel off the TV because I've read here that the ribbons will likely need adjusting. But my problem is, after plugging in all the wires again, the TV is not getting any power. The blue/red lights won't even come on. I've tried pushing the button on the bottom rim of the TV but that changes nothing. Does anyone know why that could be? My dad did mention that when he pulled the old caps off the board, he forgot to check if there were specific positive/negative posts, or if they fit it in any way. I'm puzzled. All of our other electronics are getting power so I know it's not the outlet. Thanks in advance to anyone who can help me!!

From what it sounds like, the power supply is the issue (perhaps your dad didn't solder a good connecting.) Anyway my solution looked like this: bought new power supply off ebay (150 bucks), then bought 2 new buffer boards off ebay (140 bucks) - and to my utter surprise : IT WORKS. miracle. 300 beats 600+ any day I suppose....

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BobMarley

· #318 · Oct 25, 2013

Hi everyone,

I'm from Germany and I have a hitachi P50XR01E. It has the three blinking symptom.
So I changed the two swollen capacitors and tried it again but again three blinks.
Now I tried to remove first the upper buffer and then the lower. But it seems that they both are bad. Only when I removed both at the same time the tv staying on for a while.
So now my question is if only the SDR boards are damaged or if something else damaged because I never read that everyone else has both buffers bad.
Please forgive me my bad English but I haven't found any forum in German language about this themes.

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whitezracer

· #319 · Oct 29, 2013

I had this problem with my P50H401 about 2 years ago, I took it apart and 1 of the 2 capacitors were swollen so I replaced both of them with new ones and the bottom board was bad so I replaced it. Put everything back together and it has been working fine up until last week and it did the same thing again. I took it apart again but both of the capacitors I put in last time look and feel fine this time, no swelling. I unplugged the top board this time and the bottom half of the screen works just fine without the top one plugged in so the top board is bad this time. My question is does the same 2 capacitors run the top board also and are the 2 capacitors my problem this time or is it something else?

Thanks

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lcaillo

· #320 · Oct 31, 2013

We would be guessing without referring to a schematic and knowing which caps you changed. The answer to your questions is in the circuit and in testing the components. I would suggest you get a service manual, identify the caps in the circuit and see what feeds what.

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