Re: Plasma Y-MAIN board LJ92-01200A
The Y-main sends the same signal to both boards, so it's likely that you got a defective lower buffer.
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Re: Plasma Y-MAIN board LJ92-01200A
Hi Tom,
I tried with a Schottky diode 3A 200V on D5022.
I installed only the lower Y buffer.
The diode shorted again but this time the lower Y buffer also short.
Do you think the Y buffer was defective even though she had no short-circuit at the beginning?
Or is it possible that the bottom screen is defective??
Have a suggestion?Leave a comment:
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Re: Plasma Y-MAIN board LJ92-01200A
In my research, I saw this suggestion in another forum. I do not think it is a zener on the board because it is indentifies D5022, not Z5022. It is connected from the anode to a transformer, and the cathode to a capacitor of 100UF-160v. Seems to be a circuit filter.Leave a comment:
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Re: Plasma Y-MAIN board LJ92-01200A
http://www.marsport.org.uk/smd/mainframe.htm
F6 CMOZ3V9 CSC I SOD523 zener 350mW 5% 3.9V
I'm 80% sure this is what your looking for, but I'd get a second opinion from someone more experience.Leave a comment:
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Re: Plasma Y-MAIN board LJ92-01200A
Hi Tom,
You're right, I'll get a Schottky diode, but I do not know the values of amperage and voltage.
What is strange is that the diode fail only with the lower Y buffer. She has no short circuit.
I'll keep you informed. Thank you.Leave a comment:
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Re: Plasma Y-MAIN board LJ92-01200A
You can't replace a high speed surface mount Schottky diode with a general purpose type! No matter how many "amps" it has.Leave a comment:
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Plasma Y-MAIN board LJ92-01200A
Hello, I need help to troubleshoot a Y-MAIN board LJ92-01200A (LJ41-02759A) at the component level.
Prima plasma TV model PH42T7.
Initially, I found the two Y buffers defective, on the Y main a short circuit mosfet Q5009 (One of these 7 transistors in parallel), and a diode short circuit D5022.
D5022 is indentifies F6 5L.
I bought two new Y buffers boards, LJ41-02761A / LJ41-02760A, Q5009 I removed, and installed a 1N4007 diode (1 amp) at D5022.
I have not replaced Q5009 for now.
I installed Y upper board, and the Y main.
Turn on TV for 10 seconds.
Top side of the picture is good and clear.
I removed upper Y board, and installed lower Y board.
Bottom side of the picture is very bad, garbage on screen.
D5022 diode short circuit again. Something kill it.
I checked the Y buffers boards, no short circuit on both.
I tried a second time the same operation with a diode 2 amps, same thing.
What's going on?? All fuses are good.
Another component of the Y main is in fault?
Is it possible that IPM module (the big IC) is defective?
Thank you for help.
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Is this caused by the missing diode? If so what kind of zener diode should I use to replace it?.
The led strips has 9 6V leds.
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