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jasenpeters replied to Samsung - QN65Q7DRAFXZA

in Troubleshooting TVs and Video Sources

11-20-2024, 01:30 PM
Iotas...

I think you're on to something there....Drain (pin 2) shorted straight to ground. YIKES !!!
Is there a insulation method / material / device to apply here?
Or, should I order new ones that are insulated?

[ATTACH=JSON]{"data-align":"none","data-size":"large","data-attachmentid":3511571}[/ATTACH]

EazyBone....
Land side of PSU....
[ATTACH=JSON]{"data-align":"none","data-size":"medium","data-attachmentid":3511572}[/ATTACH]...

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jasenpeters replied to Samsung - QN65Q7DRAFXZA

in Troubleshooting TVs and Video Sources

11-20-2024, 02:12 AM
[URL=filedata/fetch?filedataid=361717][ATTACH=JSON]{"data-align":"none","data-size":"medium","data-attachmentid":3511103}[/ATTACH][/URL]
It's been a while. The parts took some time to get here....
The red arrows point to the component positions that had bad components that tested bad even after removed from the circuit.
MOSFET shorted on every leg. Capacitor exploded.

However, all components on the heat sink were replaced (2 - MOSFETS, 1 - FRDiode), and the supporting capacitors (4 - 221 2kV)

Okay, so...

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jasenpeters replied to Bad main board or power supply? Vizio E420-a0

in Troubleshooting TVs and Video Sources

11-05-2024, 11:06 PM
Visio - E420-A0

Can't find a date mark....suggestions?
[ATTACH=JSON]{"data-align":"none","data-size":"small","data-attachmentid":3501064}[/ATTACH]

Symptoms - No Power LED indication, No Screen light or flicker, no Sound.

[ATTACH=JSON]{"data-align":"none","data-size":"medium","data-attachmentid":3501061}[/ATTACH] [ATTACH=JSON]{"data-align":"none","data-size":"medium","data-attachmentid":3501062}[/ATTACH]...

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jasenpeters replied to Samsung - QN65Q7DRAFXZA

in Troubleshooting TVs and Video Sources

10-17-2024, 12:38 PM
While removing the white goop from the MOSFET (and it's neighbor to the left) I noticed that Capacitor to the left of the U20A6CIC fast recovery diode, was
blown out......there it is !!!

So, what do we do now, for component level repair?
- Remove the bad cap, and re-test the components for shorts
- Replace only what reads bad on/near this heat sink
- Just replace them all (on/near the heat sink), to err on the safe side (2-MOSFETS, 1-FRDiode, 4 Caps)

Thanks in Advance

[URL=filedata/fetch?id=3486094&d=1729190196][ATTACH=JSON]{"alt":"Click...

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jasenpeters replied to Samsung - QN65Q7DRAFXZA

in Troubleshooting TVs and Video Sources

10-16-2024, 12:42 AM
The MOSFET (MagnaChip 60R290P) (Red Arrow) is shorted on all leads (GateDrainSource) in circuit.
The corresponding 2nd 60R290P MOSFET has values that may be affected by the shorted one mentioned before.

The other pair of MOSFETs (60R360Q) are matching in circuit values.

Any suggestions on safely removing the silicon goop covering the component?

[ATTACH=JSON]{"data-align":"none","data-size":"medium","data-attachmentid":3484677}[/ATTACH]...

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jasenpeters replied to Samsung - QN65Q7DRAFXZA

in Troubleshooting TVs and Video Sources

10-15-2024, 06:02 PM
Yes it is from a stock photo, however it's nearly identical to the photo I took (see attached).

[ATTACH=JSON]{"data-align":"none","data-size":"medium","data-attachmentid":3484571}[/ATTACH]
The MOSFETS on the HOT side are:
2 - MagnaChip - 60R360Q - N-channel 600v, 0.36 ohm (both share the same heat sink alone)
2 - MagnaChip - 60R290P - N-channel 600v, 0.29 ohm (both share the same heat sink with U20A6CIC fast recovery diode)

I prefer component testing for now.

"If there's continuity on...

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jasenpeters started a topic Samsung - QN65Q7DRAFXZA

in Troubleshooting TVs and Video Sources

10-15-2024, 01:33 AM
Samsung - QN65Q7DRAFXZA

2019 Samsung 65"
Q70DR 4k Smart QLED TV

Make: Samsung
Model No.: QN65Q7DRAFXZA
Version No.: FC02 / QRQ75
Serial No.: 08RH3CZM504979E
MFDate: May 2019

---------------------------------------
Symptoms
---------------------------------------
While TV on, a cracking noise heard, then no power, sound, or picture.

After back cover was removed, no visible burn marks or damaged components on power board (or other control boards (2))
On the power board (see attached)...

Fuse FP801S
T6.3AH250V...

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jasenpeters replied to EMPREX - LM-2601 - Sw26B - ILPI-082

in Troubleshooting Computer Displays

12-28-2021, 04:40 AM
Re: EMPREX - LM-2601 - Sw26B - ILPI-082

Regarding CCFL spares....

I have a few other non-working monitors with CCFL's (I assume, due to similar PSU's)
Can I butcher one of these and use the CCFL's as test spares?
Is there any compatibility issues or exact operating voltage that must be observed...or will any CCFL work as a test spare for any PSU that powers a CCFL?

Thanks in Advance

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jasenpeters replied to EMPREX - LM-2601 - Sw26B - ILPI-082

in Troubleshooting Computer Displays

12-28-2021, 04:27 AM
Re: EMPREX - LM-2601 - Sw26B - ILPI-082

Okay, a lot of reading, and more to do.....

But after reading the success of this post:
[url]https://www.badcaps.net/forum/showthread.php?t=40757[/url]

I'm considering the following parts:
N3, 3KV, SEC (3pF @ 3kV)
[url]https://www.mouser.com/c/passive-components/capacitors/ceramic-capacitors/?capacitance=3%20pF&voltage%20rating%20dc=6%20kVDC[/url]

Among the ones available (first 2 entries), the only difference I see is the dielectric material (blank vs SL).
Does it...

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jasenpeters replied to EMPREX - LM-2601 - Sw26B - ILPI-082

in Troubleshooting Computer Displays

12-27-2021, 03:32 AM
Re: EMPREX - LM-2601 - Sw26B - ILPI-082

Done - "Replace all four high voltage capacitors with at least 10pF 3kV. (10J 3kV)"

Remember: I had already replaced 2 of the 4 output caps (12J @ 3kV) with 27J @3kV, before the first post.
1 of the 2 original caps had burst and the other was darkened but not burst. These were replaced first.
The result was a visibly dim image that vanished after about a few seconds.

I have now replaced the other 2 remaining matching pair of output caps (N3 @ 3kV, both with no visible discoloration or damage)...

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jasenpeters started a topic EMPREX - LM-2601 - Sw26B - ILPI-082

in Troubleshooting Computer Displays

12-25-2021, 02:02 AM
EMPREX - LM-2601 - Sw26B - ILPI-082

Emprex - 26" LCD Monitor - Mfr. Date: May 2008

History:
- Recently purchased from a thrift shop, and went dark after about 2 weeks.

Symptoms:
- Blank black screen, smell of burned component, computers still detect monitor (as Sw26B).

Inspection:
- Took the monitor apart to find a control board and a power board.
- The power board (ILPI-082), near a pair of output leads to the monitor screen, had a visibly burned and ruptured ceramic capacitor, with the following markings:
12J
3KV
JNC
...

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jasenpeters replied to samsung un46d6000 no picture

in Troubleshooting TVs and Video Sources

12-12-2018, 11:11 PM
Re: samsung un46d6000 no picture

I tested both Right and Left LED strips.

One of the LED panels is bad, as predicted.
Of, 36 LED, most were shorted, according to the Fluke continuity test.

The other panel, the good one, all LED's were tested.
From measurements of voltage and brightness of a single LED Light,
it seems that 2-2.5 volts can have a single LED light pretty bright.
That would be about 70-90 VDC or more to light 36 pairs in series.

For a strip, there is 2 parallel lines of 36 LED's in series.
...

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jasenpeters replied to samsung un46d6000 no picture

in Troubleshooting TVs and Video Sources

12-12-2018, 12:33 PM
Re: samsung un46d6000 no picture

Roger that...

Ok, I'll take the rest of the body apart and get to the LED strip(s)...
And work from there...

I suspect that if they are in series, one or more LED's are bad.
I doubt the actual connector to the Power Board or the wiring from the
Power Board to the LED strip, but I'll check.

Sounds good?

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jasenpeters replied to samsung un46d6000 no picture

in Troubleshooting TVs and Video Sources

12-12-2018, 12:19 PM
Re: samsung un46d6000 no picture

-- Voltages at Power Board Connector: CNL802 to LED Lights

[CODE]Pin Label Voltage (DC) to GND
--- ------ -------------------
Pwr On
1st Peak 2nd Peak 3rd Peak
-------- -------- --------
7 TOP 2- 0.70 0.05
5 TOP 2+ ~210 ~21 ~1.5
3 TOP 1- ~210 ~21 ~1.5
1 TOP 1+ ~300 ~255
[/CODE]

After the final peak, the voltages repeat.
All voltages are Positive with respect to GND
~ means approximately...

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jasenpeters replied to samsung un46d6000 no picture

in Troubleshooting TVs and Video Sources

12-12-2018, 09:35 AM
Re: samsung un46d6000 no picture

"What is the power supply board P/N? BN44-00423A?"

Yes, so I assume, the Power Board has a red dot next to:
PD46A1_BSM (BN44-00423A)

See Pic below:
[ATTACH]187317[/ATTACH]

I'll have test results soon...Re: samsung un46d6000 no picture

"What is the power supply board P/N? BN44-00423A?"

Yes, so I assume, the Power Board has a red dot next to:
PD46A1_BSM (BN44-00423A)

See Pic below:
[ATTACH]187317[/ATTACH]
...

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jasenpeters replied to samsung un46d6000 no picture

in Troubleshooting TVs and Video Sources

12-11-2018, 10:19 PM
Re: samsung un46d6000 no picture

Thanks budm,

I'll keep that in my Samsung folder.
The model number in that Manual is exactly as mine: UN46D6000SFXZA

As per the Fast Track Troubleshooting Manual...
I saw an online video that suggested the "Forced Backlight-On Mode":
[url]https://www.youtube.com/watch?v=AvH1ph77Sog[/url]

I disconnected on the Power board side, CNM-803, with no results of lights coming on.

So I tested the pin out of the light connector CNL-802, with no power to the Main board...

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jasenpeters replied to samsung un46d6000 no picture

in Troubleshooting TVs and Video Sources

12-11-2018, 09:17 PM
Samsung UN46D6000 - No Picture

Same symptoms as the title:
Plugged In - Red Light Blinking on front right side
5 sets of 2 quick blinks, then 1 Long blink

Picture Black, No Sound, no response to Remote Control
No apparent signs of power other than the blinking Red Light

Pix here, Please advise if they are labelled wrong:

[ATTACH]187271[/ATTACH] - All Boards (T-Con Covered)

[ATTACH]187272[/ATTACH] - Main CPU/Receiver Board

[ATTACH]187273[/ATTACH] - T-Con Board

[ATTACH]187274[/ATTACH]...

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jasenpeters replied to Vizio - XVT472SV

in Troubleshooting TVs and Video Sources

12-11-2018, 05:54 PM
Re: Vizio - XVT472SV

budm, et al....

Just want to let you know that as of Dec-2018 (over 3 years) the Vizio is still "kickin'"

No problems since the "fix" back in Sept 2015.

I just read the thread again, and find it amazing that from a simple jumping of a resistor as in performed in the thread,
the TV has behaved normally since.

Since then (2017) I acquired another TV, LG in this case, and it was bad LED's.
Make sure you get the proper bright White LED's.
I overlooked this and got...

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jasenpeters replied to Vizio - XVT472SV

in Troubleshooting TVs and Video Sources

02-21-2016, 03:34 AM
Re: Vizio - XVT472SV

budm, and all....

Just want to let you know, it's been nearly 5 months of consistent use of the TV and still no problems, since the day I jump started it with the 1k ohm resistor.

All is good, and grateful.

Also, someone just gave me (they are throwing it out) a LG 47" (47LN5700) TV, where they say the LED's are not working. So, I may be back (a new thread of course) for more.....

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jasenpeters replied to Vizio xvt472sv - PSON Always has Voltage

in Troubleshooting TVs and Video Sources

10-02-2015, 10:40 AM
Re: Vizio xvt472sv - PSON Always has Voltage

jeebuzzin, thanks for the "props". But, I couldn't get as far as I did without "panda" Budm.
He's an awesome mentor and guide.

In my case, I too jumpered U33 to ground using a 820ohm resistor. And the TV has worked ever since (5 days). I can't tell you why though. I really never confirmed a failing part.
The "jump" seemed to bring it back to behaving normally.

I'm still tracking down a schematic and will make it available as soon as it's acquired.

I would...

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