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Crumbtrail TV Forums: TV Equipment: Plasma TV Forum:
panasonic TXP46G15 No power

 

 


Jules
New User

Sep 14, 2014, 9:16 PM

Post #1 of 14 (2032 views)
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panasonic TXP46G15 No power Can't Post

Hi Guys,
I have a panasonic TXP46G15 with no power.
Seems to be no shorts from all boards so points to power supply. Can anyone help on this please?

Thanks.

Regards,
Jules.



jts1957
Veteran


Sep 14, 2014, 10:15 PM

Post #2 of 14 (2026 views)
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Re: [Jules] panasonic TXP46G15 No power [In reply to] Can't Post

"When an abnormality has occurred the unit, the protection circuit operates and reset to the stand by mode. At this time, the defective block can be identified by the number of blinks of the Power LED on the front panel of the unit."


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Location: Far, Far Away


Jules
New User

Sep 15, 2014, 3:17 PM

Post #3 of 14 (2012 views)
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Re: [jts1957] panasonic TXP46G15 No power [In reply to] Can't Post

Thanks JTS, I get 6 flashing lights on it.


jts1957
Veteran


Sep 15, 2014, 6:25 PM

Post #4 of 14 (2007 views)
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Re: [Jules] panasonic TXP46G15 No power [In reply to] Can't Post

Pin 65 of the CPU IC9003 monitors the status of the SC board. During normal operation, a low is applied to pin 65. If the SC board becomes defective, a high is provided to pin 65. As a result, the unit shuts down and the power LED blinks 6 times.


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Location: Far, Far Away


Jules
New User

Sep 15, 2014, 6:42 PM

Post #5 of 14 (2005 views)
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Re: [jts1957] panasonic TXP46G15 No power [In reply to] Can't Post

Thanks JTS, So are you saying it is the SC board that is at fault? (transistors maybe)


jts1957
Veteran


Sep 15, 2014, 7:32 PM

Post #6 of 14 (2002 views)
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Re: [Jules] panasonic TXP46G15 No power [In reply to] Can't Post


In Reply To
Thanks JTS, So are you saying it is the SC board that is at fault? (transistors maybe)


That's what the literature (and my interpretation of it) seem to be saying (FETs most likely).


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Location: Far, Far Away


Jules
New User

Sep 15, 2014, 8:31 PM

Post #7 of 14 (2000 views)
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Re: [jts1957] panasonic TXP46G15 No power [In reply to] Can't Post

Thanks again jts, I will test them to see if there are shorts and try to order some. Having said that , I continuety tested the power connection on the SC board and there was no short at that point. <br> <br>Regards, <br>Jules. <br>


(This post was edited by Jules on Sep 15, 2014, 8:31 PM)


jts1957
Veteran


Sep 15, 2014, 8:51 PM

Post #8 of 14 (1997 views)
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Re: [Jules] panasonic TXP46G15 No power [In reply to] Can't Post

NO resistance reading at all between connector SC2 pins? How about any DC voltage?

Careful you do NOT try to run more than 30 seconds with ANY connector unplugged.


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Location: Far, Far Away

(This post was edited by jts1957 on Sep 15, 2014, 8:53 PM)


Jules
New User

Sep 15, 2014, 9:11 PM

Post #9 of 14 (1994 views)
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Re: [jts1957] panasonic TXP46G15 No power [In reply to] Can't Post

what should voltage be from PSU to SC board please?


jts1957
Veteran


Sep 15, 2014, 9:41 PM

Post #10 of 14 (1992 views)
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Re: [Jules] panasonic TXP46G15 No power [In reply to] Can't Post

Adjust driver section voltages referring the panel data on the panel data label.
Check or adjust the following voltages with the multimeter.
*See the Panel label.
Name Test Point Voltage Volume Remarks
Vsus TPVSUS (SS) Vsus 2V VR251(P) *
Ve TPVE (SS) Ve 2.5V Fixed *
Vset TPVSET (SC) 290V 9V Fixed
Vad TPVAD (SC) - 195V 2V VR16600 (SC)
Vscn TPVSCN (SC) Vad_base : 148V 1V
GND_base : - 47V 3V
VR16841
(SC)
Vda TP9 (P) 60V + 1V, - 2V Fixed

Caution:
Absolutely do not reduce Vsus below Ve not to damage the P.C.B.


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Location: Far, Far Away

(This post was edited by jts1957 on Sep 15, 2014, 9:43 PM)


Jules
New User

Sep 15, 2014, 9:58 PM

Post #11 of 14 (1989 views)
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Re: [jts1957] panasonic TXP46G15 No power [In reply to] Can't Post

This may be a little beyond me, How can I ajdust voltages?


jts1957
Veteran


Sep 15, 2014, 11:43 PM

Post #12 of 14 (1986 views)
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Re: [Jules] panasonic TXP46G15 No power [In reply to] Can't Post

What voltage is being measured currently at Vsus (Vs)? (You CANNOT adjust what isn't there.)

Panel Data Label should look something like this:


Final adjustment will be made with the TV working, with a specific signal applied and with certain controls set on certain settings.
Name: Vsus (aka Vs) (Voltage Sustain)
Test Point: TPVSUS (SS) (Test Point where to measure VSustain. Reference to panel/ground)(SS is the board where it is located)
Voltage: Vsus plus or minus 2 volts (from what is written on label)(Voltage expected and tolerance allowed)
Volume: VR251 (P) (Adjustment for Vsus)(Variable Resistor used to make adjustment. P is the board where the VR is located.)


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Location: Far, Far Away

(This post was edited by jts1957 on Sep 15, 2014, 11:47 PM)


Jules
New User

Sep 16, 2014, 9:13 PM

Post #13 of 14 (1969 views)
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Re: [jts1957] panasonic TXP46G15 No power [In reply to] Can't Post

Thanks jts, I will try


jts1957
Veteran


Sep 16, 2014, 10:21 PM

Post #14 of 14 (1967 views)
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Re: [Jules] panasonic TXP46G15 No power [In reply to] Can't Post

What voltage is being measured currently at Vsus (Vs)?

I really don't see how you can miss it this time.


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Location: Far, Far Away

 
 
 


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