Panasonic Plasma TX-P42G20B -3 red blinks

[ezquerro]

Hi, Im looking manual service for Panasonic TX-P42G20B included block diagrams.
also how to fix no display /3 red blinks // 3 - blinks 3.3v SOS D Board??

[tw2005]

Re: Panasonic Plasma TX-P42G20B -3 red blinks

3 blinks, that's a rare one. No D-board. definitely 3 not 4 blinks?

here's a guide for this gen. 3 can be SC board failure too according to this. SC shorts at Vsus SC2 quite common.

Would not hurt to quickly check that. Shorted SC has also triggered SOS4 & 10.

Board will be TNPA5081 , (check revision AH?) which i know fairly well as i have a 50" version.

This will do for fault finding, A board version may be different, rest should be essentially the same.

[ezquerro]

Re: Panasonic Plasma TX-P42G20B -3 red blinks

thanks for Troubleshooting Handbook, I will do this test tommorow
my one : A- board TNPH0838 and test point is TP9011
but I don't have a block diagrams

this manual is for europe version and has different component names

[tw2005]

Re: Panasonic Plasma TX-P42G20B -3 red blinks

thanks for Troubleshooting Handbook, I will do this test tommorow
my one : A- board TNPH0838 and test point is TP9011
but I don't have a block diagrams

this manual is for europe version and has different component names

please explain what differences you have concerns about.

I still feel that manual will do the job.

The A board shown is a TNPH0838. It may be a different revision but layout should be the same.

SC TXNSC11NEK = TNPA5081AH = TXNSC1LGUU

SS TXNSS11NEK = TNPA5082AH

SM TNPA5086 = TXNSM11NEK42

PSU LSEP1290EEHB = LSEP1290EEHB

C1 = TNPA5094 = TXNC11LHUU

C2 = TNPA5095 = TXNC21LHUU

Maybe a picture of the layout of yours would help clarify.

I am seeing a TNPA5130 XW tuner board and a logic board TNPA5299(D board? 3D model? GT20?) on FlatTV parts and SJ.

As for block diagrams, both they and the schematics are in there. What precisely are you trying to identify?

[ezquerro]

Re: Panasonic Plasma TX-P42G20B -3 red blinks

I have enclosed my A-board layout below

I am looking for a schematic A-board TNPH0838
How and which components I have a measure on A-board ?

[tw2005]

Re: Panasonic Plasma TX-P42G20B -3 red blinks

I have enclosed my A-board layout below

I am looking for a schematic A-board TNPH0838
How and which components I have a measure on A-board ?

I was hoping you'd post a snap of the whole rear of the TV with the boards .

Use the manual I linked, it's the same layout.

TP9011 is a 3.3V test point on the A board, use the schematic too.

IC9803 is the 3.3v reg, it needs 15v at pin2, produces 3.3v out of pin 3. gnd is pin4. I'm getting this straight out of that manual.

TP9011 is around ic9803 next to q9002 or L9000 for 3.3V

I would start with the 3 blink flowchart in the training guide, it asks for checking shorted Vsus, Vda & 15V first.

Then checks short on the A for the 3.3v, then isolates the 3.3v from the C boards to confirm whether it's on the A or C, then gets you to isolate each C to determine which one.

Obviously depending on what you find will determine which path you take but ultimately the options are SC, C boards, A or panel. I would not expect the panel.

Vsus , 15V , 5v go to the Sc board, Vda goes to the C boards , 3.3v is produced from the 15v on the A, goes to C boards

3 blink is P+3.3V, there are Sub 3v and STDBY 3V but they are different SOS.

[ezquerro]

Re: Panasonic Plasma TX-P42G20B -3 red blinks

do not laugh please, but basic questions:
I should measure the resistance between chassis ground and the pins on VDA,VSUS when TV is unpluged from power?
it doesn't show any resistans on pins from the table only few ohms but on pin3 /p11 and pin4/p35
how to check TP9011 if that test point is on the foil side ?
I should connect TV to power before?

[vinceroger69]

Re: Panasonic Plasma TX-P42G20B -3 red blinks

have you got much experience with testing electronics the only reason for asking if you havnt please say then when can help advise on what meter settings etc you need to test the boards with i would also put all the boards back into the set and connect all the leads/cables back up then follow the flow chart and take readings etc.

[ezquerro]

Re: Panasonic Plasma TX-P42G20B -3 red blinks

I have a experience with testing mobile phones not TV,
I have measure resistance again, results:

p15v scale 20k pin 4 conn. 1,97 wire 3.95
vsus pin 1 unable to test on all scales shows 1
vda pin 1 unable to test on all scales shows 1
over the scale

[ezquerro]

Re: Panasonic Plasma TX-P42G20B -3 red blinks

I have turned on the tv without c1 board and half of the screen appear
many thanks guys