Re: philips 170s turns on for 1s and than dead
I guess budm was right.
I disassembled the entire screen down to the lamps,
tested the lamps and they were good.
I put everything back together and it works.
But I strongly suspect it was a loose cable, as budm suggested.
But nonetheless, the crucial part was
troubleshooting that transformer. That was key.
That and replacing all the bad caps.
mihovilko
Member
Last Activity: 04-18-2018, 05:39 PM
Joined: 02-22-2018
Location: Zagreb
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Re: philips 170s turns on for 1s and than dead
First and foremost, thank you all for your patience.
The patient has recovered and working fine.
But besides the screen working, I want to thank you all
for helping me acquire new skills and understanding.
Forums like this are really the reason why Internet is a good thing.
All my love to you guys. (but not the gay kind)Leave a comment:
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Re: philips 170s turns on for 1s and than dead
Come on people! Anyone?
The screen turns on and then the backlight fades away.
No visible image on screen.
Does anyone have an idea?
Video is in the last post.Leave a comment:
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Re: philips 170s turns on for 1s and than dead
Ok, here's the deal. The transformer came in, the resistance is very close to the one on the board. I installed it dilligently, however, other problems emerged.
Pls halp.
[url]https://www.youtube.com/watch?v=aUEkkcH-vTA&feature=youtu.be[/url]Re: philips 170s turns on for 1s and...s halp. <br />Leave a comment:
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Re: philips 170s turns on for 1s and than dead
Thank you guys for your help so far.
I'll try to get a transformer and I'll get back to you with the results.Leave a comment:
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Re: philips 170s turns on for 1s and than dead
Here it goes:
IT-E19-NB4004B
DCWM0541(02)INVLeave a comment:
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Re: philips 170s turns on for 1s and than dead
Here you go....Leave a comment:
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Re: philips 170s turns on for 1s and than dead
Yup, still the same. 0.355 MOhm reading.Leave a comment:
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Re: philips 170s turns on for 1s and than dead
I checked for reverse continuity on the mosfets and I get a reading in only one direction.
As for the transformer, I rechecked it and it really is 300K. I'll disconnect it and measure again.Leave a comment:
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Re: philips 170s turns on for 1s and than dead
Vis a vis the transformers:
[ATTACH]172294[/ATTACH]
and again, the continuity doesn't sound off on either.Re: philips 170s turns on for 1s and than dead
Vis a vis the transformers:
[ATTACH]172294[/ATTACH]
and again, the continuity doesn't sound off on either....Leave a comment:
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Re: philips 170s turns on for 1s and than dead
Progress!
the P channel mosfet shows 0.171 V voltage between D and S,
and I can read that same voltage on both the diodes on the opposite side (using diode check function).
So the diodes seem to be shorted, altough the meter doesn't chirp in continuity mode.
On the second mosfet (N channel) I read 0.180 V from S to D.Last edited by mihovilko; 02-27-2018, 08:40 AM.Leave a comment:
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Re: philips 170s turns on for 1s and than dead
7808 is: bjt31936 f18k8 06535
7823 is: 40T03gh 534546
7806 is: 4415GH 536418Leave a comment:
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Re: philips 170s turns on for 1s and than dead
OK, so if it's not fixabl, could someone pls tell me which part of the board to disconnect so I can at least use the 12V and 5V outputs as lab power supply?Leave a comment:
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Re: philips 170s turns on for 1s and than dead
Well, it's not a half screen problem, it's 2 seconds to black.Leave a comment:
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Re: philips 170s turns on for 1s and than dead
Yup, all the lamps flash on. Any other suggestion?Leave a comment:
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Re: philips 170s turns on for 1s and than dead
I'll try to do that in the near future.
Is it possible to connect original lamps one at a time and power them through the circuit to see if they're ok? Or do they all need to be working at the same time?Leave a comment:
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Re: philips 170s turns on for 1s and than dead
Um. Is it too late for me to pitch my problem in this same thread?
Exactly the same problem here. I replaced all bulged caps, but still no go on the 2 sec to black. Also tested transformers, seem to be working, I guess. I can't find the fault. Help, pls?...Leave a comment:
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