Re: Marantz SR5008 Protect Mode
Just wanted to update, the resolution to the random incorrect Thermal B error i was having was ultimately fixed by reflowing the main cpu (some of the pins looked cold) PN:R5F56108VNFP
JeffJ
Senior Member
Last Activity: 09-26-2022, 09:55 AM
Joined: 04-20-2012
Location: Ontario
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Re: Marantz SR5008 Protect Mode
Just hitting a false thermal protection, No odd noise....Leave a comment:
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Re: Marantz SR5008 Protect Mode
Thanks for the input, the ol' tappy tap tap on the back right corner with a rubber handle of a Philips#2 fixes it first tap every time for about a week so its 100% something loose by thermal expansion and contraction.
I'll have a look. Thanks for narrowing it down for others.
I also see some users just disable the Protection circuit all to geather but thats a bit extreme for a loose connection....Last edited by JeffJ; 12-10-2020, 10:12 AM.Leave a comment:
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Re: Marantz SR5008 Protect Mode
I know this is old by my unit just started doing the exact same thing do you recall what 3 edge connectors, i want to be least invasive as possible with pin bending....Leave a comment:
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Re: LG 32LH500B - No power, no standby
thanks again for everything!...Leave a comment:
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Re: LG 32LH500B - No power, no standby
Woudl this be a suitable one?
[url]https://www.digikey.ca/en/products/detail/vishay-semiconductor-diodes-division/ZMY9V1-GS08/4934142[/url]
Edit, I just put fresh batteries in my meter and retested the voltage on BP to be sure, and its consistently 6.4VDC, 12.5VDC on the Base of Q0D1.
Is a 9.1 VZ for D0D6 still acceptable?Re: LG 32LH500B - No power, no stand.../4934142[/url]...Last edited by JeffJ; 08-13-2020, 01:24 PM.Leave a comment:
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Re: LG 32LH500B - No power, no standby
Thanks for the help, i have it running right now i suppose i should shut it off until i get the new diode
Attached is the finished schematic with the 470K resistors labeled as such....Leave a comment:
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Re: LG 32LH500B - No power, no standby
Will do, and the effects if i do no replace the Zeener? can it be ran like this until my next digi order?...Leave a comment:
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Re: LG 32LH500B - No power, no standby
Ok sorry for the rapid posting, I replaced R0D9 with a 4.7K SMD because thats what i had and the Diagram for LMK677K suggested this was a valid option.
I removed ZD06 IT was shorted, well it was 22K which was very low.
I put it all back together with out ZD06, everything else is populated on the board as it should be (put R2D9 and R0D9 back on the board)
Now i get 12vdc at the Base of the PNP transistor and BP now reads 7VDC suggesting its no longer running on its internal regulator and is running on...Last edited by JeffJ; 08-13-2020, 11:13 AM.Leave a comment:
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Re: LG 32LH500B - No power, no standby
Here is a quick draw up with the corrections i made to yours, feel free to suggest if something is wrong.
Edit: Ive removed ZD06 ans its 22K across it, now 389K across R0D5 and C0D5 as expected. So its safe to say this is the failed part... I have no idea its Value is it safe to leave it out?...Last edited by JeffJ; 08-13-2020, 09:49 AM.Leave a comment:
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Re: LG 32LH500B - No power, no standby
R0D6 is connected to the emitter of Q0D1 and from R0D6 it goes to R2D9 so they are in series So Q0D1 Emitter -> R0D6 -> R2D9 -> BP
D1D2 you have labeled is actually labeled D1D3 (Markings "M7" on the diode) And its Anode is connected to the Anode of D0D1 in the rectification diodes.
The Main Filter cap - terminal the circuit actually goes to is C0D4 but thats labeling because the filter caps negative sides are tied together.
SO its all basically correct and I do not get 390K...Last edited by JeffJ; 08-13-2020, 08:51 AM.Leave a comment:
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Re: LG 32LH500B - No power, no standby
17K i in one direction on Z0D6 (Positive probe on anode) and 22k in the other (negitive probe on anode)
17k on both R0D5 and COD5.
ZOD6 and Q0D1 were measured with out R2D9 in circuit, just so you know....Last edited by JeffJ; 08-12-2020, 10:11 PM.Leave a comment:
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Re: LG 32LH500B - No power, no standby
Here is another photo to show traces hope it helps...Leave a comment:
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Re: LG 32LH500B - No power, no standby
Collector of Q0D1 is attached to the annode of Z0D6 DCV is .54v across Z0D6...Leave a comment:
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Re: LG 32LH500B - No power, no standby
Z0D6 the anode goes to the negative terminal of C0D1
across it i get .7 Vac...Leave a comment:
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Re: LG 32LH500B - No power, no standby
IT looks like
E-C .36v dc 2.5v ac
B-E .3v dc 2.5v acLast edited by JeffJ; 08-12-2020, 08:14 PM.Leave a comment:
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Re: LG 32LH500B - No power, no standby
I meant Reassemble
replace R0D9 R2D9 and Z0D5.
English is my first language, and I am not good at spelling or proof reading it seems lol...Leave a comment:
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Re: LG 32LH500B - No power, no standby
Alright, this i will have to do tomorrow I only have a TS100 at home and my air station is at work, and i feel like i should get this back together properly so we can meter Q0D1 out properly to give us answers.
Ill touch up Z0D6 as well
Should i resemble everything or just R2D9?...Leave a comment:
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Re: LG 32LH500B - No power, no standby
All 3 meter out to 470k almost on the button
But what you said makes sense and its got to be something in this areas still. because with R2D9 in place BP is low (2.7V) and also the VDC across C0D1, COD4 and the D pin on the LSK677K is all 154.7V. with R2D9 removed across C0D1, COD4 and the D pin on the LSK677K is 160.7VCD which is proper, so something is pulling it down....Last edited by JeffJ; 08-12-2020, 07:23 PM.Leave a comment:
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Re: LG 32LH500B - No power, no standby
Also R0D6 goes to the Emitter of Q0D1 which my research suggests is a MMBT3906 (bottom right pin of Q0D1 in attached)...Leave a comment:
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