Finding replacement bits for a Panasonic Plasma SC board

[tw2005]

Re: Finding replacement bits for a Panasonic Plasma SC board

Hi guys,
This is my first post in this forum and I think this is the right place to ask for some help.
The TV is almost the same - TX-P50U10E and the problematic board is TMPA4829 AB.
I can't find the names of the blown transistors Q441 and Q451. Please advice.
Best regards
Nick

should be on the casing of the transistor

q441 B1JAEP000006, GT45G127 or toshiba igbt 45G127
q451 B1JAEP000006, GT45G127 or toshiba igbt 45G127

[nickarsow]

Re: Finding replacement bits for a Panasonic Plasma SC board

should be on the casing of the transistor

q441 B1JAEP000006, GT45G127 or toshiba igbt 45G127
q451 B1JAEP000006, GT45G127 or toshiba igbt 45G127

Hi tw2005,
Yes, sure, but if the cases are on their places.... :-)
It seems there has been a huge blow.....

[bman4]

Re: Finding replacement bits for a Panasonic Plasma SC board

Working on one of these and blew it up. Replace evrything that i could find shorted. When i jump sc 50 i get the green light then it goes out. I found q16661 rjp6065 and it keeps shorting collector to emitter. There is no short when removed. I was poking around and found ic920 witch is NJM2903V JRC2903 TSSOP-8 at pin 4 to 5 and it corelates with emitter. I pulled the ic and the short still remains . i tested the other ones on the board and there is not short to pin 4&5. When i took a look at schematic these pins do not correlate. I tested everything i could with a multimeter and cannot find this short. Just found the schematic again and will get back to it tommrow. I posted a pic of the circut for q1661 sc page 3/4 .

[bman4]

Re: Finding replacement bits for a Panasonic Plasma SC board

Nevermind, the ic i removed is ic1920 and pin 4 and 5 are linked together. C691 right before q661 gets a charge becase it has a nice arc when discharging. My multi meeter cannot read 30g123 or rjp6065 and my lcr broke.
I did read them to be real before it broke . i had 1 out of 10 30g123 read good and the rest as capacitor.

[bman4]

Re: Finding replacement bits for a Panasonic Plasma SC board

The small smd bits i replaced are q16801,q16701,q16702,q16810, they didnt short again. I dont think the gate circut would cause collector to emitter short.

[R_J]

Re: Finding replacement bits for a Panasonic Plasma SC board

Yes it can, if its not receiving the proper (pulse) signal. If the gate is turned on hard (dc voltage) the fet will likely short.

[bman4]

Re: Finding replacement bits for a Panasonic Plasma SC board

Im just thinking of replacing everything in this circut that i cannot test. Im thinking of powering it on without rjp6065 to see what that gate voltage is.

[bman4]

Re: Finding replacement bits for a Panasonic Plasma SC board

im getting 195v on the gate without the rjp6065 in circut.i did forget to put ic1920 back in. The 220v circut must be shorted to the gate. This must be wong shouldent parts be burning up. Might be - 195v ireuploaded the service manusl for easy access.

[bman4]

Re: Finding replacement bits for a Panasonic Plasma SC board

I decided to test ic784 witch is mip9L02 for the 220v caps. The source pin is not shorted to its gnd but chassis and get 0.5v on power up.

[bman4]

Re: Finding replacement bits for a Panasonic Plasma SC board

Disregard last post source is grounded threw coil. Vsus must be shorted to gate . rjp6065 has a gate voltage of 30v when its getting 195!

[bman4]

Re: Finding replacement bits for a Panasonic Plasma SC board

I forgot to mention the diodes i replaced. D652,d865 replaced with a random 888A because at that time i figured a diode is a diode. I replaced them negative to collector like the rest i see on board. Next i removed d673,d674 because i thought they where the short. I did not have schematic and figure negative to collector. When looking at the schematic i believe its positive to collector for d673,d674. Im gonna look over the schematic to try and figure out polarity and order the proper diodes.

[DXseekerMO]

Re: Finding replacement bits for a Panasonic Plasma SC board

Seems as though I have one of these with a severely wasted panel.

[bman4]

Re: Finding replacement bits for a Panasonic Plasma SC board

Mine is a tc- p42u1 and dont know what condition the panel is in . pretty impressive.to have that many hours.
Are you pointing towards you may want to sell your parts and scap it ?

[DXseekerMO]

Re: Finding replacement bits for a Panasonic Plasma SC board

I haven't even looked at it yet, other than plugging it in and giving it a (no) go. Had it for 3 months. I don't think badcaps.net allows sales on or through the forum.

Eventually I do intend to part it out, just been busy with repairs.

[bman4]

Re: Finding replacement bits for a Panasonic Plasma SC board

Possibly Donate and i pay for a shipping label or you direct me to you ebay ad.

[DXseekerMO]

Re: Finding replacement bits for a Panasonic Plasma SC board

Mine is a TC-P42X1

[bman4]

Re: Finding replacement bits for a Panasonic Plasma SC board

Mines the 1080p version,it's why i want to spend the time to repar it. I wonder what the diffrences in sc boards are. I know i can probly fix mine but its been 4 moths wating on parts and failures. Im about to give in and buy one!

[bman4]

Re: Finding replacement bits for a Panasonic Plasma SC board

My diodes where all in proper poliarity. Im getting the same voltage reading from cap 813 big black 220v.at bottom. I get conunity from ic784 pin 6 / positive of cap 813 to emiiter of q661 but not collector or anywhere else. I get the same voltage on emiiter and collector negative - 195 testing from chassis. I used a rf101l4s diode at d652, d865. I removed removed them and voltage still remains.

[bman4]

Re: Finding replacement bits for a Panasonic Plasma SC board

pin 6 of ic784 mip9l02. Pin 9 is gnd that has conuninty to emitter of q661. So maybee its.the culprit. My dirst.test.i messed up.and forgot to connect ac to buffer clips and got arcing. I remeber when i did this to another it blew a ic like this up bur was shorted unlike this. This also has 195v between source and ground but not negative 195 getting 400v from gnd to drain with leads to 250v cap. Source has conunity to chassis gnd but i think its threw coil L897 and reads 1.5 ohm. I get 0.0 from gnd of ic784 to emitter of q661.