Re: Panasonic TNPA5335 - from 7 to 6 LED blinks after Repair Kit
Well lets say I checked every bit of the SC Board
Checked all IGBT´s FET`s and Diodes.
Checked control signal drive circuit (Drive IC´s and Power IC`s and components in circuit like Resistors, Transistors and Capacitors)
Also checked power circuit and everything looked good.
Well there was no more option left for me since I dont own an scope but I had a bad feeling while soldering the tiny IC502 and Q531 cause my "Weller" soldering iron broke some weeks ago and...
ChaosEx
Member
Last Activity: 08-30-2022, 08:06 AM
Joined: 05-22-2016
Location: NRW
-
Re: Panasonic TNPA5335 - from 7 to 6 LED blinks after Repair Kit
Okay I constantly read 76,5 Ohm each way at diode D407.
Please check for R621, R622, R623.
I read 79,7 Ohm each, where they should read 220 Ohm.
Maybe the dead diode killed the resistors too in my case which did not happened at your board?Leave a comment:
-
Re: Panasonic TNPA5335 - from 7 to 6 LED blinks after Repair Kit
hmmm that sounds weird.
well the only thing different may be that I get constant beeps in both ways and the area directly around the diode looks a little burned (brownish).
Maybe you can tell me your resistance values in both ways?
Ordered the diode anyway, hope it arrives this week.
Yes I rechecked IC502. Well by checking I mean continuity from IC arm to the next component in trace. And Pin 1 is at the Pin1 marking on the board.
Is...Leave a comment:
-
Re: Panasonic TNPA5335 - from 7 to 6 LED blinks after Repair Kit
Found one
[URL="http://rohmfs.rohm.com/en/products/databook/datasheet/discrete/diode/schottky_barrier/rb162m-40.pdf"]Spare Diode[/URL]Re: Panasonic TNPA5335 - from 7 to 6 LED blinks after Repair Kit
Found one
[URL="http://rohmfs.rohm.com/en/products/databook/datasheet/discrete/diode/schottky_barrier/rb162m-40.pdf"]Spare Diode[/URL]Leave a comment:
-
Re: Panasonic TNPA5335 - from 7 to 6 LED blinks after Repair Kit
So I checked so far for shorts @ the Transistors and found nothing apart from the normal short between the outer legs at the 3 leg side.
But while searching for the right components to measure, I saw a diode which colored the area around it noticeable brown. So I checked it and it has continuity in both ways.
Lets look at this little sucker and the role he plays (red marking):
Its D407 and it looks like he plays a role with the 3 transistors you mentioned...Leave a comment:
-
Re: Panasonic TNPA5335 - from 7 to 6 LED blinks after Repair Kit
men i just love this place, so many talented people helping each other,great.
I checked the soldering joints by measuring continuity and all was good.
I checked those 6 resistors and all 6 read 7,5 Ohm.
So my toDo list for today:
check Q531 and IC502 (yeah you never know, maybe faulty new parts)
Yeah by a look at Schematics its really hard to understand why the Rep Kit dont refers to the Buffer ICs of the blown area, so I will also check:...Leave a comment:
-
Re: Panasonic TNPA5335 - from 7 to 6 LED blinks after Repair Kit
Alrighty,
cant wait for tomorrow, this little spare TV is killing my eyes + football EM.
So I checked everything and the only short between the pins appeared only between pin 1 and 3 of the following diodes:
D432;D461;D462;D481;D482;D642;D643;D641;D401;D421
No shorts between legs @ Transistors.
And for the other list; yes I just listed those short to gnd, other parts (diodes and transistors of the same construction form) are not shorted to gnd.
...Leave a comment:
-
Re: Panasonic TNPA5335 - from 7 to 6 LED blinks after Repair Kit
Alright, will check this evening. Tell you tomorrow the results.
Thanks so farLast edited by ChaosEx; 06-14-2016, 07:35 AM.Leave a comment:
-
Re: Panasonic TNPA5335 - from 7 to 6 LED blinks after Repair Kit
I triple checked every cable connection, same result. 6 blinks.
Then I checked every Transistor and Diode of the same construction form. Due to the overview I will only list the parts where I was able to measure a short to ground (Negative probe @ Tv chassie)
Q421: Short @ Emitter
Q422: Short @ Emitter
Q423: Short @ Emitter
D421: Short @ Pin 1 and 3
Q661: Short @ Emitter
Q660: Short @ Source
D461: Short @ Pin 1 and 3
D462: Short @ Pin 1 and 3
Q452:...Leave a comment:
-
Panasonic TNPA5335 - from 7 to 6 LED blinks after Repair Kit
Had to use the Repair Kit for my SC Board.
Original 6 Transistors were all shorted and VSUS was shorted (When removing P2 it wasn't anymore) but I used the whole Kit and changed:
D401, D421, IC502, Q531, Q421-423, Q401-403
Measurement after replacing parts was ok, no more shorts on Transistors and no more short on VSUS (when Board reconnected) + continuity test from the tiny IC Pins to the next component in trace (Checked by Schematic Service Document) to make sure everything went good.
After I reconnect board and triple check cable... -
Re: Panasonic Plasma SC Board TNPA5330 - accidentally ripped solder-pads away
@Alastair E
Yes you are absolutely right. Maybe this is the reason why I felt something warm in my pants right after it happened
@tw2005
You are the men. Ping 5 and 6 are really not connected and therefore came off first. How many dark experiences you must have made to know this...
And because of you I realized that there are schematics for the SC Board in the service manuals, I just overlooked them the first time
...Leave a comment:
-
Panasonic Plasma SC Board TNPA5330 - accidentally ripped solder-pads away
Hi,
I have to use one of those Rep Kits including D401, D421, IC502, Q531, Q421-423, Q401-403 because all of them were shorted.
But I accidentally ripped away two solder-pads of IC502 while unsoldering.
It is Pin 5 and 6 of IC "BD8693FVM" as you can see on the picture.
(hope quality is good enough)
I need someone to follow the trace with a multimeter on an good board so I can bridge directly from one of the IC arms to the first component in the trace.
Would be wonderful if someone could use my picture... -
Re: New Members - please post your introductions here
Well, I think this forum is a great place for all sort of technicians.
A place like this is very important so all technicians can help fix things so people dont replace it by a new model.
Helps to make the world a better place with less e-waste
And since Iam an technician for 5 years I have to be a part of thisLeave a comment:
No activity results to display
Leave a comment: