Which buffer ICs failed? tried removing a few failed ones and see if it will fire up with a pic?
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I thought I also had this but nope. Found two resistors R521 and R522 open circuit near IC521. I initially had IC521 shorted which was replaced. replaced the resistors but still getting a short flash and then 6 blinks.
I thought I also had this but nope. Found two resistors R521 and R522 open circuit near IC521. I initially had IC521 shorted which was replaced. replaced the resistors but still getting a short flash and then 6 blinks.
Can you put a summary list of what you've replaced?
Did you check those 2 diodes (marked 88) that I just had shorted ?
Buffers are in. (thanks for Overnight express) Perfect,Perfect Perfect. Fantastic image and SC is now silent with a load .
10500 Hrs
Now have another TNPA4782 to repair. A lot learnt here as far as what parts you can get away with , with some lateral thinking and cross relating knowledge of the 5081 boards.
Just having a look at this spare dead 4782AF, straight away I see D618 is burnt. I'm starting to think i missed this as it's in the shadows of the heatsink .
What's unusual is this too being revision AF , however it has a Vset cct.n So i have one which has and another not both AF. This board does look a little older so maybe mine was the last of a production change. Both TVs are P50G15A
Mine is the AB model, I got from a TCP50S1. I did the initial replacing parts and heard a pop and burnt smell which turned out to be D618, and also leading to D608 blowing ,Realizing I missed IC521 and Q551. after replacing everything again, 7 blinks turned to 6 blinks.
If the SC is repaired and with SC50 jumpered and SC plugged in, the set should stay on solid and no blinks correct?
Mine is the AB model, I got from a TCP50S1. I did the initial replacing parts and heard a pop and burnt smell which turned out to be D618, and also leading to D608 blowing ,Realizing I missed IC521 and Q551. after replacing everything again, 7 blinks turned to 6 blinks.
If the SC is repaired and with SC50 jumpered and SC plugged in, the set should stay on solid and no blinks correct?
yep and i strongly recommend you test it that way until it does becasue I'm convinced I killed my buffer boards.
So far I also replaced Q818 2sk3018 and only IC771 78L05, IC724 and IC725 seem good. I checked about every large smd diode I can find and nothing seem shorted. Q441 was 45G127 (the one on the right heatsink). that one didn't have a diode in front of it. measuring the TO-220 diodes I'm getting 0.287 and OL.
Ok, well i'm only just starting on this but is your Q451 shorted G-E ? I'm finding you have to be 100% thorough nearly skipped over that one.
For transistors so far, Q661,601,441,451,D618,
Also, can you look at R869, R613 47K near D618. 613 is burnt and I can't get a stable reading suggesting these may have an issue but have not looked at the schematic yet
So far I also replaced Q818 2sk3018 and only IC771 78L05, IC724 and IC725 seem good. I checked about every large smd diode I can find and nothing seem shorted. Q441 was 45G127 (the one on the right heatsink). that one didn't have a diode in front of it. measuring the TO-220 diodes I'm getting 0.287 and OL.
yep got mixed up with other 45g127, both mine are dead
Forgot to mention I also replaced IC773, 464, and 465 to be safe. For D806 i have 0.758 and OL in diode mode, 9.75k resistance in both directions
interesting, I may have an issue there. i get the resistance but in diode 1.69 and 1.67. Do you remember waht yours was reading before you replaced it?
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