Re: Samsung 50" Plasma, Model# HP-S5053, Audio, but no Picture
Any updates on this?
I'm also not sure if that is against policy or not. I will talk to the owner of the tv to see how/if he wants to proceed. I figure he may just want to cut his losses. I'm a little discouraged as this is the first time the TV has won, was able to fix 3 up to this point at the component level, but this TV has me stumped. I still have a feeling it isn't putting out the correct voltage and there is something up with the Vsc_h as it is jumping around all over the place and the Vsc_h...
Vandy30
Member
Last Activity: 03-13-2016, 09:08 PM
Joined: 09-25-2013
Location: Jonesboro, AR
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Re: Samsung 50" Plasma, Model# HP-S5053, Audio, but no Picture
Nick,
Lol, I know what you mean and I appreciate you taking the time and helping me out with this.
I guess I just need to confirm that the board is in fact bad. I know it's receiving all the correct voltages from the Power Supply, so I just need to confirm whether or not it is trying to send the correct voltages to the upper and lower y buffers while the buffers themselves are disconnected. I think that way it would be safe to assume the board is bad. If it's not too much trouble,...Leave a comment:
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Re: Samsung 50" Plasma, Model# HP-S5053, Audio, but no Picture
Alrighty,
First off, Thank you very much Nick, I owe you one
. Here are my readings.
On the Upper Pin continuity check, groups 2/3/4/5 & 9/10/12 were connected, but 14/16/18/20 were not, on both modules.
On the Lower Pin continuity check, groups 2/3/4/5/10/11[B]/16/17[/B] & 6/7/8/9 were good. It looks like you may have labelled bottom pin 16 as pin 15 in the picture so I think you mean 16/17 if i'm not mistaken?
For...Leave a comment:
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Re: Samsung 50" Plasma, Model# HP-S5053, Audio, but no Picture
Nick,
Just checking in to see if you've had a chance to get your Ysus board up and running and if those voltages going to the ybuffers are around 60 V. I'm about at my witts end with trying to locate the bad component on my board lol. Almost considering sourcing a replacement board, but want to be certain it is the source of the error.
Thanks,
Vandy30Leave a comment:
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Re: Samsung 50" Plasma, Model# HP-S5053, Audio, but no Picture
Wow! Thanks for the detailed response Nick's TV's.
Here goes...All diodes/zener diodes to the left of the 10 parallel transistors... D5002, D5023, D5024 are all good as well as the 4 Zener's (8 total) for both the upper and lower y buffers. I actually wish this was the issue lol.
Now, for the 10 transistors in parallel (TA36N30P), I'm checking those with the power off using my diode check function on my DMM and I'm getting:
[INDENT]Source(+) to Drain(-) = 0.417 V[/INDENT][INDENT]Source(+)...Leave a comment:
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Re: Samsung 50" Plasma, Model# HP-S5053, Audio, but no Picture
Thank you for the info Flocko. Sorry for the delayed response, been busy.
I was able to remove the 2 diodes I inquired about (F4 xx) and they tested ok out of circuit. I also removed another diode in a different location and a zener diode and both tested good.
I really don't know what I need to do next. I still think the issue is on the Ymain, in particular some of the components related to the Vsc_h since that reading is jumping around from -4 to -7 volts and is supposed to be -70...Leave a comment:
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Re: Samsung 50" Plasma, Model# HP-S5053, Audio, but no Picture
Thanks Doc
,
I went back and found 2 diodes that I'm not sure if they've failed or if the surrounding circuitry is causing a strange reading. D5203 is the one in question (probing in photos 1 & 2, close up of location in 4th photo). It is showing s/c. This is on the lower y buffer. The exact same diode on the upper y buffer is reading the same... 0.001V regardless of the position of the leads (see pics 1 and 2).
I'm not very good at desoldering smd's, so before I attempt to do...Leave a comment:
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Re: Samsung 50" Plasma, Model# HP-S5053, Audio, but no Picture
More news:
I was able to find a voltage checksheet online for the TV. Below are the actual vs measured voltages:
Vs(actual)= 200V
Vs(measured)=200V
Vset(actual)=190V
Vset(measured)= 194V
Ve(actual)=110V
Ve(measured)=112V
Vscan(actual)=-190V
Vscan(measured)=-188V
[B]Vsc_h(actual)=-70V
Vsc_h(measured)=~-4V to -7V erratic [/B]
Vdd(actual)=5V
Vdd(measured)=5V
Vcc(actual)=15V ...Leave a comment:
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Re: Samsung 50" Plasma, Model# HP-S5053, Audio, but no Picture
Does zsus=xmain? I measured this on the board on the right side, facing the back of the tv.
[B]Ve = 112.3 VDC[/B]
Sticker states: [B]Ve = 110 VDC[/B]Re: Samsung 50" Plasma, Model# HP-S5053, Audio, but no Picture
Does zsus=xmain? I measured this on the board on the right side, facing the back of the tv.
[B]Ve = 112.3 VDC[/B]
Sticker states: [B]Ve = 110 VDC[/B]Re: Samsung 50" Plasma, Model# HP-S5053, Audio, but no Picture
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Re: Samsung 50" Plasma, Model# HP-S5053, Audio, but no Picture
Thanks Hamie,
[B]Vscan = -188.8 VDC[/B]
The sticker on the back of the tv indicates Vscan should be [B]-185 VDC[/B]...I assume this is within tolerance?
Unfortunately I do not have a desoldering station as this is just a hobby at this point.
How would I go about checking the module chips exactly? Those are new to me.Re: Samsung 50" Plasma, Model# HP-S5053, Audio, but no Picture
Thanks Hamie,
[B]Vscan = -188.8 VDC[/B]Leave a comment:
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Re: Samsung 50" Plasma, Model# HP-S5053, Audio, but no Picture
Hello all, checking back in...issue still persists (no picture, but audio) and I believe the problem is on my Ymain board (left side of thumbnail 1). Attached are some photos of the tv back and board in question, I hope the quality isn't too terrible.
I'm still confused as to what is causing the "clicking" noise on the board? Is something trying to power up and is shutting off repeatedly? The clicking noise seems to be coming from an integrated sub assembly board on the Ymain, I took some...Leave a comment:
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Samsung 50" Plasma, Model# HP-S5053, Audio, but no Picture
Hello Everyone,
Trying to fix an old Plasma for a friend. This is my second thread on here, similar situation (audio, no picture), but last time the issue was on an LED.
[B]TV Specs:[/B] Samsung 50" Plasma, Model# HP-S5053[INDENT]Ymain PN: LJ92-01436A[/INDENT]
[B]Symptom:[/B] Audio, but no picture, not even the slightest glow, pitch black
[B]Checked so far:[/B] [LIST=1][*]Power Supply-Outputting correct voltages on all pins, seems good. [*]Ybuffer boards - upper & lower ICs all look ok visually.[*]Ymain - replaced 2 bad caps, (C5034... -
Re: Vizio VF552XVT, audio, but no backlighting
IT WORKED!
! I just finished soldering the 2 replacement MOSFETS in the LED Driver Board, connected the board back up, and presto. To the best of my knowledge, the 2 shorted MOSFETS on the LED Driver Board were all that was wrong (knock on wood, it's only been running a short time up to now). I'm guessing there is some sort of feedback loop that detected the shorted MOSFETS which then told the PS to cut power to the LED Driver Board as a safety feature maybe? I'm still not positive on that one, but regardless, it is up and running....
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Re: Vizio VF552XVT, audio, but no backlighting
In hindsight I should've watched the videos before digging in lol, I just got the cart before the horse. Thanks for the sympathy.
budm, that definitely sounds like the best way to tackle these SMDs.
So, I'm still wondering...should I attempt to [I]patch[/I] this thing back together? Will it hurt anything if I leave it as is and solder in the new components? Thoughts? Suggestions? I've got the replacement components ordered already and I'm just wondering if I should do some...Leave a comment:
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Re: Vizio VF552XVT, audio, but no backlighting
I really hate to even post these photos...be gentle lol. I did a terrible job and its quite embarrassing
, but I would feel more comfortable letting you guys take a look and getting your honest opinion if this pcb damage can be fixed or not. My main concern is the copper pad on the left that the MOSFET sits on, since it is raised up off the board. Can that just be adhered back down? Will soldering the new MOSFET in be ok if left as is? I probed around on the board just doing continuity checks in the area and...
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Re: Vizio VF552XVT, audio, but no backlighting
Well, my first time desoldering a MOSFET/Transistor didn't go so well
...I probably damaged the pcb 
. The laminate underneath the big base tab on the MOSFET bubbled up some and the first one even peeled up some laminate/copper with it when I removed from the board (I didn't even know that was possible!). Too much heat and prying. The second one came off much easier after I saturated with solder, so at least I learned my lesson, just angry with myself and venting a bit.
On with the...Leave a comment:
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Re: Vizio VF552XVT, audio, but no backlighting
budm, I did as you mentioned and still no luck. Essentially, I've isolated the Main, PS, and LED Driver Board (removed T-CON and LEDs) and still got the same results.
The [B]GOOD NEWS[/B] is, I started probing some of the larger transistors and diodes and may have just found that 2 out of 8 of my D442 transistors are bad. The 2 in question read a short while the other 6 read 0.70V.
I did have a question with regards to testing diodes though. Do most diodes read between 0.3-0.8V? This was...Leave a comment:
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Re: Vizio VF552XVT, audio, but no backlighting
Here are the final photos, all taken at the Power Supply. The photos show voltage readings taken before and after disconnecting the LED Driver Board from the Power Supply...the 5V, 12V and 18V outputs on the PS were good regardless.
The first 3 photos were taken with everything connected (before)
[B]Photo 1 - Vout=0V[/B]
Photo 2 - A=2.8V "Ext_VBR-R"
[B]Photo 3 - B=1.2V "ON/OFF"[/B]
The last 2 photos were taken after disconnecting the LED Driver...Leave a comment:
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Re: Vizio VF552XVT, audio, but no backlighting
Just in case, I've added some closeup photos of the LED Driver board if anyone is interested. The ribbon cables in the 3rd photo are what I disconnected to remove the LEDs from the circuit. As mentioned before, same result.
I did get some photos of voltage readings taken at the LED Driver board inputs (same as what the PS it outputting, but wanted to show at the LED Driver Board since the pinout was right above the connectors and easy to read). These readings are just for the pin 13 and 12 (Ext_VBR-R & ON/OFF respectively)....Leave a comment:
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Re: Vizio VF552XVT, audio, but no backlighting
I hope these photos turn out better than the first. I took a photo of the back of the TV and then each individual board. My main focus right now is the Power Supply Board (dead center, yellow) and the LED Driver Board (Left side, tall, skinny).
The Power Supply Outputs are all on the right side of the board. The 2 topmost connectors run down and to the left and connect to the LED Driver Board on the bottom right side of the board. Top connector I believe to be the master because it has the 2 extra pins, "Ext_VBR-R"...Leave a comment:
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