Re: Panasonic TC-P65VT30 No Power, No LED
I ended up buying a new main board and installed it with the original power boards. TV powered up and worked great!
One interesting note, I originally powered up the TV with the new main board through my dim bulb tester (with a 100W incandescent bulb) and the TV didnt power up at all (didnt hear any relays click). Only when I plugged it in directly to the wall did the TV work properly.
Thanks for the advice!
pokepoke0610
Member
Last Activity: 06-27-2021, 05:21 AM
Joined: 05-02-2014
Location: Nashua NH
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Re: Panasonic TC-P65VT30 No Power, No LED
R_J: There was no change in the voltage of pin1 of P6 (it stayed at 0V) when the power button was pressed. I still need to find IC5000 (and STB1.2v and STB3.3v). Will try and get to that this weekend. It seems as though the main board is damaged and should be fixed/replaced, but am wondering what the likelihood of other boards being damaged is.Leave a comment:
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Re: Samsung S64FH Sound but no picture then no power
BriansTVParts: Sorry for not seeing your question. I did in fact get the TV working. I would have replaced the power board but it was out of stock at ShopJimmy at the time. They did sell a replacement component kit and I replaced the active components (along with the blown thermistor and fuse I had bought previously) which fixed the TV. TV has been running for ~3 years nows.
Thanks for everyone's help/input!Leave a comment:
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Re: Panasonic TC-P65VT30 No Power, No LED
Thanks for the responses.
diif: I checked all the fuses I could find on the power boards including a few surface mounts and all were fine. I will go back and look for the all the fuses called out in the
service manual again. I have checked the fuses on the PSUB board. I have also applied power to the 2 relays with the board removed and heard them click at around 8V (and hold at much lower voltage) so my guess is that board works.
R J: Am I correct that you are asking me to check pin 1 of P6 on the power board. Is...Leave a comment:
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Panasonic TC-P65VT30 No Power, No LED
A friend of mine experienced a power surge that damaged his Panasonic Viera TC-P65VT30 Plasma Television. The symptoms are no signs of power and no blinking LED code nor is the LED lit. After taking off the back, I inspected the boards and performed the testing advised on pages 25-27 of the Service Guide for Panasonic Plasma TVs. In ohming out each of the pins on the SS, SC and A boards I didnt find a short circuit to GND. I made these
measurements unpowered with each connector disconnected from the power board. This seemed to indicate that I should replace the main power board.
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Re: BN44-00516a
Today in reading a different post "Samsung PN64E8000 won't come on" by BlueAutumn, one of the posts (from Nick's Tvs) suggested shorting PS-ON to gnd and VS-ON (I believe) to D5.3V to simulate what I suspect is the turn-on of the TV from the logic board. I connected PS-ON to GND via 100ohms and pulled up VS-ON to D5.3V through 100ohms. I then applied power via my dim bulb tester (100W lightbulb). The bulb flickered some but after a few seconds the bulb went out. I measured VS at 221V and VA at 55V which seems correct.
Currently I am not sure...Leave a comment:
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Re: BN44-00516a
Dick,
I will take a photo and post when I have a chance. It certainly seemed surprising to me although micros are pretty cheap and can be easily used for measuring and sequencing rails.Leave a comment:
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Re: BN44-00516a
Oh I get it now - you replaced all components on your board with the shopjimmy repair kit and for some reason the replacement UQ802 was defective.
For your board did you find any other components to be bad? I have been trying to trouble shoot on the board. I would prefer not to have to remove the conformal coating to remove the ICE3BR2565jf offline converter - maybe I am just being lazy but my board re-work skills are marginal at best.Leave a comment:
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Re: BN44-00516a
I wouldnt trust me either! Not equipped with everything here so I will have to take a photo tonight.
The part from the repair kit I purchased also shows the same marking
MCV14A
-1/SL
It does seem to have a Microchip logo. You can barely make out the Microchip logo in the 4th photo of the 2nd post by Jeffer76 if you zoom in on the 14-pin SOIC.Leave a comment:
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Re: BN44-00516a
It appears to be a MCV14A - an 8-bit microcontroller from Microchip if my search skills are correct.Leave a comment:
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Re: BN44-00516a
Jeffer76,
It sounds like I might have a similar problem to you (my original post was "Samsung S64FH Sound but no picture then no power"). I have found that QS802 and QS804 were shorted on my board and I have replaced them (I had bought the BN44-00516A repair kit).
My question is how did you determine that UQ802 was defective? Appreciate any insight you might have.Leave a comment:
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Re: Bn44-00514a psu no stby
I may or may not have a similar situation and have been reading this thread. I had originally made a post
called Samsung S64FH Sound but no picture. I had found that QS802 and QS804 were shorted. I bought the
replacement kit (which included those transistors) from ShopJimmy.com and have replaced those 2 MOSFETs.
I powered up my board (BN44-00516A) via a dim bulb fixture using a 100W light bulb. The light bulb did not
turn on which was a positive development. I have made the following measurements following the conversation...Leave a comment:
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Re: Samsung S64FH Sound but no picture then no power
Just getting back to this. I built a dim bulb tester and plugged the power board into it. When I turned on the switch the light bulb lit up brightly. The AC voltage from Hot to Neutral was ~5V. Using a thermal camera the current limiter gets fairly hot even at this voltage - approaching 70C. Nothing else appears warm (the diode bridge has a couple of degree rise)
In ohming out QS802 (FDPF18N50T - 500V/18A 265mohm MOSFET from Fairchild)
Pin 1 (G) to Pin 2(D): 12ohm (both directions)
Pin 2 (D) to Pin 3 (S):...Leave a comment:
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Re: Samsung S64FH Sound but no picture then no power
Thank you for responding. Any suggestion regarding wattage of the light bulb?
I purchased 5 fuses/inrush limiters but will attempt to test just the power board not hooked to anything initially once I receive the components.Leave a comment:
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Re: Samsung S64FH Sound but no picture then no power
After much searching I had something incorrect. The actual inrush current limiter labeling should be
WMEC (WMEC Corp.)
WTR (WTR Series)
15D080 (15D means 15mm in diameter, 080 is 8.0 ohms @ 25C)
In looking at specs for this inrush current limiter, the max steady state current @25C is 5A. The closest inrush current limiter I could find on Digikey appears to be a Cantherm MF72-008D15.Leave a comment:
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Re: Samsung S64FH Sound but no picture then no power
Thanks for responding. The branding on the inrush limiter is a bit difficult to read but from what I can make out, there are 4 lines of information
WM8
WTR
15D080
07195
On the first line I am guessing that the third character is an "8"
On the third line I think the second character is a "5" but I have some doubt.
On the 4th line I think the second character is a "7" but I have some doubt.
If you have any idea what the...Leave a comment:
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Re: Samsung S64FH Sound but no picture then no power
Just a quick update. The model number is S64FH-YB01. Thanks again for any thoughts about what components to look at or the part number for NT801S. Thanks!
Dave...Leave a comment:
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Samsung S64FH Sound but no picture then no power
I am attempting to diagnose an issue with a Samsung S64FH Plasma (I believe) television for a friend. While I dont have first hand knowledge of how it failed, he described it as initially there being sound but no picture. After trying to turn the TV set off and on a few times eventually that stopped, with nothing happening including no TV power button light being illuminated. This occurred during the time of a power outage and I dont know if a surge caused these issues.
1.) I have attached a photo of all the boards in the television (SamsungS64FH.jpg).
2.) I have also attached... -
Re: New Members - please post your introductions here
Hello everyone,
Plenty of great information on here. Thanks to everyone who takes the time to post and share their knowledge/experience. I appreciate it.Leave a comment:
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