Re: Panasonic P42S30 14 Blinks, need help diagnosing SN board issue
I finally got this done (I accidentally knocked a resistor off and had to wait for replacements to arrive), and now am receiving 8 blinks. See the attached error.
Looking at the SS board, there looks to be some arc marks on one of the grounds, are there any common failure point on these SS boards?...
jhbox
Member
Last Activity: 12-30-2017, 12:51 AM
Joined: 07-30-2017
Location: Austin, TX
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Re: Panasonic P42S30 14 Blinks, need help diagnosing SN board issue
Well I guess I'll start by replacing those 4....Leave a comment:
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Re: Panasonic P42S30 14 Blinks, need help diagnosing SN board issue
Wait, do I need to remove these from the board to test them? Because 4 of the 6 are getting continuity across all three legs and that seems oddLeave a comment:
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Re: Panasonic P42S30 14 Blinks, need help diagnosing SN board issue
I'm not sure I'm doing this right, please forgive my noobishness. I have the pinout here: [url]http://www.datasheetcafe.com/30f131-datasheet-pdf/[/url]
1 gate
2 collector
3 emitter
Now correct me if I'm wrong for an operational pnp transistor
Pos-gate neg-emitter = no continuity
Pos-gate neg-collector =no comtinuity
Pos-emitter neg-gate = continuity
Pos-collector neg-gate = continuity
Pos-emitter neg-collector = no continuity
Pos-collector...Leave a comment:
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Re: Panasonic P42S30 14 Blinks, need help diagnosing SN board issue
So I just tested all of the 30f131 transistors, 4 of the 6 had continuity between all legs and two had continuity with high resistance (not enough for my multimeter to berp). Which of these are good?Leave a comment:
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Re: Panasonic P42S30 14 Blinks, need help diagnosing SN board issue
not sure what you are trying to say there tw2005... thanks I guess?Leave a comment:
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Re: Panasonic P42S30 14 Blinks, need help diagnosing SN board issue
I tested the ICs as it was a suggestion by a user here: [url]https://www.badcaps.net/forum/showthread.php?p=626878&highlight=P42S30+gold#post626878[/url]
Also I didn't test against ground, it was the test point at TPVFG, pardon me.
Now just to verify, to test my transistors I will :
-check resistance between the emitter/gate, ensuring continuity only one way
-check resistance between the collector/gate, ensuring continuity only one way
-check resistance between the emitter/collector,...Last edited by jhbox; 11-14-2017, 08:11 AM.Leave a comment:
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Re: Panasonic P42S30 14 Blinks, need help diagnosing SN board issue
I just realized that I am also showing resistance/continuity between the Vsus at SS11/P11.Leave a comment:
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Panasonic P42S30 14 Blinks, need help diagnosing SN board issue
Got the TV from a friend, 14 blinks normally, 8 with the SN board unplugged at SN2/P2.
I've done a good bit of research on here and have determined that the SN board has a short somewhere, but am unsure exactly what. I have checked the ICs, all of which seem to check out when I test resistance to TPVFG.
What is the most common component on these SN boards to go bad? I'm pretty good with soldering, most of my experience is actually with control units from old motorcycles but it translates well.
Any help is greatly appreciated. -
Re: Toshiba 55SV670U No standby light with 5 standby volts
Any ideas? budm? R_J? Anyone?Leave a comment:
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Re: Toshiba 55SV670U No standby light with 5 standby volts
Ah, I got you, pardon me.
I observed an odd behavior just now. On POW_SIG, I am getting a quick reading when I unplug the tv from ac power at the wall. What would cause that?Leave a comment:
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Re: Toshiba 55SV670U No standby light with 5 standby volts
Also, found a manual for this actual model...Leave a comment:
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Re: Toshiba 55SV670U No standby light with 5 standby volts
Which connectors are you talking about? Also, 80 has 5v across the coil, and is closing, and SR81 is 12v and is not closing. I think you have it backwards.Leave a comment:
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Re: Toshiba 55SV670U No standby light with 5 standby volts
I was unable to detect anything obviously wrong with my main board, though perhaps I don't know what to look for. I'll try to ID the fuses and caps there and start going through them, lacking any expert guidance from the sages hereLeave a comment:
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Re: Toshiba 55SV670U No standby light with 5 standby volts
Pardon me. 12 on SR81, 5 for SR80Leave a comment:
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Re: Toshiba 55SV670U No standby light with 5 standby volts
@budm
Sorry its taken me so long to reply. 4.92on SR80 and a flat 0 from SR81.Leave a comment:
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Re: Toshiba 55SV670U No standby light with 5 standby volts
I'll take a peek at the main board tonight, have to admit I haven't given it any real attention. I'll be relieved/annoyed if it turns out to be something dumb there....Leave a comment:
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Re: Toshiba 55SV670U No standby light with 5 standby volts
@budm
I'll see if I can track down POW_SIG. Still not getting a standby light on the front though.
@R_J
In my research I saw that R851 and Q880 often go bad together, or that was the jist I got. either way, I've got steady volts coming off of it, so its doing its job.Leave a comment:
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Re: Toshiba 55SV670U No standby light with 5 standby volts
Also, I took a look at those Q transistors. Looks like I'm getting continuity across the cathode and anode pins of Q881, Q841, and Q852. Getting no continuity across Q813 and Q832. Looks like those last two need to...be replaced? Not going to lie folks, I'm lost here. Thanks for all your tutelage so far.Leave a comment:
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Re: Toshiba 55SV670U No standby light with 5 standby volts
@R_J
Yes, 3.28 on POW_TV.
No change on POW_SIG , showing 0
@budm
AC_DET : nothing when power switch is activated or otherwise
POW_PRT: 3v
POW_SIG: nothing when power switch is activated or otherwiseLeave a comment:
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