Re: SAMSUNG PS42D51SX bad picture
Can you make sure scope is set to DC on CH1? That waveform does not look right.
Can you make sure scope is set to DC on CH1? That waveform does not look right.
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Re: SAMSUNG PS42D51SX bad picture
You should be seeing a square wave around 200Vp-p but the wave is barely 100Vp-p, and very distorted.
It is possible it is the control board, but I really doubt it.
Do you have good +15V to X-main?Please do not PM me with questions! Questions via PM will not be answered. Post on the forums instead!
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Re: SAMSUNG PS42D51SX bad picture
14.9vComment
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Re: SAMSUNG PS42D51SX bad picture
I really suspect the board you got is bad and has the same fault as your old one. Boards from cracked screen TVs are rarely tested. For comparison, check the YOUT on the Y-main. The YOUT will have some additional ramps on it, but otherwise should look very similar.Please do not PM me with questions! Questions via PM will not be answered. Post on the forums instead!
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Re: SAMSUNG PS42D51SX bad picture
I do not see Y OUT
I see OUTLComment
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Re: SAMSUNG PS42D51SX bad picture
YOUT is on the Y-main.Please do not PM me with questions! Questions via PM will not be answered. Post on the forums instead!
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Re: SAMSUNG PS42D51SX bad picture
my friend I do not see this point on board YComment
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Re: SAMSUNG PS42D51SX bad picture
Ah, this chassis is different to the one I have been using as reference. At OUTH, what do you see?
If you have a second probe, it may be useful if OUTH is not ground referenced, we will find out.Please do not PM me with questions! Questions via PM will not be answered. Post on the forums instead!
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Re: SAMSUNG PS42D51SX bad picture
2ms
2mikrosek
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Re: SAMSUNG PS42D51SX bad picture
It looks a little better, can you try 2 microseconds on the X-main?
At least it is like a square wave. The scope is probably bandwidth limiting causing the ramps (instead of sudden square), I see that sometimes on my 100MHz scope.Please do not PM me with questions! Questions via PM will not be answered. Post on the forums instead!
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Re: SAMSUNG PS42D51SX bad picture
yes but there is flickering
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Re: SAMSUNG PS42D51SX bad picture
Set scope to GND, centre trace (using vertical position), then try again, does it look the same?Please do not PM me with questions! Questions via PM will not be answered. Post on the forums instead!
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Re: SAMSUNG PS42D51SX bad picture
it seems so
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Re: SAMSUNG PS42D51SX bad picture
So, it appears the XOUT is stuck at around 150V (possibly 197V -- Vsus), when it should be going from 0V to 200V. I think the X-main is definitely bad.
Where is the ground of the scope probe connected?Please do not PM me with questions! Questions via PM will not be answered. Post on the forums instead!
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Re: SAMSUNG PS42D51SX bad picture
this board is declared the seller for defective, they sent another board to me, I hope next week is here
Again, thank you for your timeComment
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Re: SAMSUNG PS42D51SX bad picture
to the metal frameComment
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Re: SAMSUNG PS42D51SX bad picture
Metal frame is good for ground.
I hope you can get it working.
I have replaced this very same X-main board in a different Samsung plasma. It has a high failure rate. On mine it was dead short from Vs to GND, TV would not power up.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: SAMSUNG PS42D51SX bad picture
when it's the other board come I will write again.Comment
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Re: SAMSUNG PS42D51SX bad picture
Hi Tom
Before 10 minutes I put the new board in TV but the problem is same.
and oscilloscope displays the same VALUES
Now I'm desperateComment
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Vizio e601i-A3 - Has Sound and Display, But No Backlight - Bad Power Supply Board or Bad LED Bulbs ?I was given this TV from my great uncle. He said it just wouldn't turn on one day out of nowhere, replaced the TV, and gave it to me to possibly fix and use for myself.
Upon bringing it home and plugging it up, it showed a standby light.
I powered it on and without a flashlight, the display showed the "V" but the lighting is very dim, but visible.
The screen seems to blackout and stay black, but with a flashlight I can see the display.
With my Playstation 4 connected via HDMI, and running a game I can hear sound.
Assuming... -
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... -
I hope this is the right forum to post in despite not technically being a repair, but still a question of swapping boards.
I thought I'd explore the possibility to upgrade an existing working Samsung ue55nu7096u with the logic board (and power board if needed) of a newer model (ue55ru7105k) of the same size and appearance (and resolution). The reason being I'd like the extra inputs of that board including component in, an extra HDMI port and bluetooth. Its panel is broken so I have no use for the board otherwise.
The models launched in 2018 and 2019 respectively.... -
Samsung LN46C630K1F – Intermittent Backlight, BN44-00341B Power Board
Summary for TL-DR readers:
• Backlight is intermittent, may come on with TV boot or not. No flickering, never fails during TV on.
• Have obtained Samsung schematic & service documents - Can upload if helpful.
• Have read ALL applicable threads
• C1818 and CP820 replaced as low hanging fruit
• CN802 data taken for normal and failed BL operation. SUMMARY: Pin 2 - 5vDet = 3.52 @normal, 0.0 @BL fail. Pin 6 - EPWM = 1.631 @normal, 1.058 @BL fail.
• VCC pin (18) of PFC... -
Hi all!
I've recently run into an issue with my Samsung UN55H8000AF LED TV displaying no image. I've done quite a bit of research in terms of what could be wrong with it. Below are the steps I've taken prior to reaching out here for some assistance:
1. I've tried replacing the T-Con board (BN95-01594A), twice and have still experienced the same issue with all the boards I've tested with.
2. I've tried to remove one side of the ribbon cable that goes from the T-Con board to the panel and still not getting any image on left or right side.
3. I've checked voltages...
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