As we've said all along, Sony don't fit crap quality capacitors, so they don't fail
LOPT transistor failures on Sony CRT sets were commonly caused by dry joints on the line driver transformer, which is something you resolder if you ever change the transistor - apart from that it was almost always the LOPTX arcing internally, which instantly blows the transistor again.
My procedure was as follows:
1) LOPT transistor found to be S/C
2) Examine driver transformer VERY carefully for dry joints with a magnifying glass.
3) If dry joints, resolder, replace transistor, and see if it works.
4) If no dry joints give customer a quote for replacing the LOPTX and transistor (and STILL resolder the transformer as well).
Notice that if there were no dry joints I didn't even bother removing the S/C transistor.
A further complication was that it often blew the main-micro (a large SM device) - funnily, despite using the exact same chassis, it depended greatly if it was a 4:3 set, or a 16:9 widescreen set - I can't remember which way round it was, but one type killed the micro probably 50% of the time, and the other probably only 5% - weird or what?
It's so good to read posts like this from a knowledgeable TV tech...even though he has been away from CRT for a while...thanks Nigel
What a lot of people do not understand is that the Line Driver Transformer must provide clean drive to it's Boss...the Line Output Transistor.
If the LDT has problems for whatever reason...the LOT will get hot and fail..
With Ching sets here...Smoothing on the LDT Primary is critical...a little 47MF or sometimes smaller. If it's gone low...you blow Line Output Transistors..
Anything will eventually blow after a while.....no matter the rating or quality...
I tried to teach my previous "Tech" here that.....beyond him and his understanding of stuff....
Leave the workshop for 30 Minutes..and I see BU508DF and other Line Output Transistors lying all over the show..wasted...he is thinking...I will try another one...the others were bad
I am sooo glad he is gone. He made me a mad crazy person.
And now you Guys have to deal with me. Sorry
TODAY..
LOL..even Stupider....now....He wants to come back..........What is it about uselessness that certain people don't understand....
Like....WE DON"T WANT YOU HERE ANYMORE...
You are wasting..you are going to kill the Company....go away..
Your Salary is about half of what you waste on a Monthly basis....
GO AWAY..
No says he...you owe me....."MASSIVE SWEARWORDS ATTACHED"..Bit of a Racial thing here...hey, black/white...I don't care. Just do the job...Fair.....
Always goes wrong at the end of the Day where you try and reason with someone that is lacking that ability.....and is not aware of it..
Some idiots just don't get it. Only in Africa...where the useless fight for just being useless...
Because there is nothing else they can do....
Absolutely not sustainable.....thinking is all the same...economy down the drain....
What is wrong with these fools.......what is wrong??
Say something straightforward....to them....easy to work out..."they take offense"
FFS...what is wrong here......
For example...ETO has decided they have had enough of me...
Will I fight it = no. I will accept it. Will I try sue ETO = NO. WTF.....try and work yourself back into a place that tried to get rid of me anyway....you see how mad this "Logic" is....
Huge rant here and I am sorry....but I have to bail. Mods delete at will.
How do you deal with Morons?
Regards,
tvtech
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