Re: Dude is bringing over a Hitachi P50S601 (plasma 1080)
Thanks for the tips cadiman. I'll remove the Y drive and check the ESR on all caps plus I'll check all diodes and MOSFETS. If I can't find any faulty components then I'll have to make a call on whether or not to gamble on a new Y drive. I already have a TV though and I enjoy this more as a hobby so I was interested more in repairing the Y drive rather than board swapping. These are very complicated devices and the service manual doesn't have schematics for the sustain boards so it really is a but futile. I prefer the Samsung...
leo_the_noob
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Last Activity: 03-24-2017, 07:45 PM
Joined: 01-13-2012
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Re: Dude is bringing over a Hitachi P50S601 (plasma 1080)
Thanks for the encouragement cadiman .I've only been doing this for a while but I'm hooked on this forum and the thrill I get when I succeed in a repair. I've spent lots of time reading and have managed to fix a few things (stumbling and asking for help along the way) but this is only my second plasma tv and I think this will be tougher to repair than the first which had a Samsung panel.
The buffer boards were bad on this Hitachi (Model P50H401) but now that i have the replacement buffers I'm still getting...Leave a comment:
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Re: Dude is bringing over a Hitachi P50S601 (plasma 1080)
I was just looking over that Y sus board and checking the MOSFETS for shorts. I did come across a diode D44F which is a FCU20UC30 fast recovery diode. The diode checks Ok with meter , infinite resistance in one direction and practically nothing in the other but I noticed the 2 anode legs on the diode both short to the heatsink the diode is mounted to. Is this normal? I know it's badnews when a MOSFET shorts to it's heatsink but not sure about diodes. YES I AM A NEWBIE. Trying my best guys and learning a lot here but any help...Leave a comment:
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Re: Dude is bringing over a Hitachi P50S601 (plasma 1080)
[QUOTE=cadiman;230658]Those 100v 3300 uf caps are bad on every one of these power supplies and very common failure.
the secondary voltages are running at 85 volts at these caps.
I have not had any other cap issues on this power supply other than these two large caps.
These are narrow caps and you have to watch when ordering replacements.
The buffers fail on these and can take out the y drive.
QUOTE]
Cadiman I was just given one of these...Leave a comment:
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Re: Philips HTS3051B Home Theater Blue Ray - No POWER
I have an ESR tester and checked out all of the caps on the power supply board. They all looked good and tested good for ESR. It was just the 3.3V circuit that had a loose connection. I actually found the fix slightly by accident . I wanted to check voltage on pin 1 and pins 5,6 of the APE1801M IC which were hard to get at with my meter so I soldered a jumper to it. When I powered it on to meter it I heard the laser on the blue ray player moving which I had not heard before so I knew something was different. Once I saw it was...Leave a comment:
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Philips HTS3051B Home Theater Blue Ray - No POWER
I just picked this system up on Ebay for a great price. Symptoms are the word Philips scrolling across the units LED display and then it freezes. No video, no sound, no response to eject button on Blue Ray player. I searched the internet for a solution and found that this is a common problem but no one shared a solution. A page from the service manual says to check voltage on each pin of connector CN9001 and all my voltages were good except for the 3.3V , I was only getting about 1.8V.The service manual says to replace the power supply board at that point but I didn't want to give in that quickly.... -
Re: Vizio VP50 HDTV20A no picture no sound
Just wanted to post a follow up. It's been about 2 months since I replaced the faulty components on the X-Main and Y-Main boards as well as one shorted buffer IC on the upper buffer board. The TV has been working great and I love it. Many thanks for all of the help, this forum is an incredible resource and I've been visiting daily just to try to keep up with it all. I've since repaired a Vizio 32" LCD TV and a 26" Sanyo LCD TV and I've enjoyed every minute of it. Thanks again!Hopefully I'll soon reach a point where I've learned...Leave a comment:
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Re: Vizio VP50 HDTV20A no picture no sound
I'm out of luck on the scope. I've already removed one bad buffer IC from the upper buffer board as it was obviously toast. The others look good. I've seen the youtube videos and the Coppell TV blog explaining how to check the Samsung LJ92-01203A / LJ41-02761A and LJ92-01202A / LJ41-02760A buffers for shorts but I'm afraid this doesn't apply to my buffers. Those buffer boards have 6 ICs a piece while mine have 4. I'm suspecting the pins on the connectors may not be laid out the same way making those tests inconclusive. Hoping someone can...Leave a comment:
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Re: Vizio VP50 HDTV20A no picture no sound
Update: Got some parts in the mail today and replaced damaged components on X and Y SUS Main boards. I'm now able to connect both boards without Y buffers connected and set will power on and stay on plus I now get audio when I cycle the inputs. If the set is staying on is it reasonable to assume my Y SUS board is ok? I couldn't find any shorted MOSFETS or any other bad caps on it. Just wondering because buffer IC chips are on the way from China and worried about doing all that rework on the buffers only to have my YSUS and buffers burn...Leave a comment:
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Re: Vizio VP50 HDTV20A no picture no sound
If any one of you gentlemen has the same Samsung Y-MAIN board(LJ41-04217A) that I do then please take a look at 2nd picture at the top of this thread. There are 2 resistors there next to the burned capacitor. It's hard to make out the color bands but both look the same and appear to be connected in parallel. I disconnected one of the resistor's legs and it measured 10.6 ohms. I'm not sure if this is the correct value given it's condition. Please chime in if you have and knowledge about it.Leave a comment:
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Re: Vizio VP50 HDTV20A no picture no sound
That's good to hear. I'll go ahead with board repairs and see where I'm at after that. I have a hot air rework station and quite a bit of experience reflowing BGA chips on laptops and xboxes so I'm considering attempting the reapir of my buffer boards myself. I really have nothing to lose but time and a small investment in the IC chips. The chips on the lower buffer are marked FE 3407F 1N07942A and on the upper buffer 3407F 1N078E9A. As I understand it only the FE 3407F part matters right? I've found plenty of ebay vendors with these in...Leave a comment:
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Re: Vizio VP50 HDTV20A no picture no sound
Thanks for the tip. I went ahead and adjusted Vs to 207. Still shutting down after about 20 seconds. Is this normal due to the XMAIN and YMAIN being disconnected. Before I disassembled the TV I tested it briefly and seem to remember the green light in front staying on but a strong burnt odor coming from the TV. I also remember seeing very brief flashes on left and right edges of the display. I'm ordering replacements for the the burned components on the XMAIN and YMAIN boards. I have an ESR meter that I've never used before...Leave a comment:
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Re: Vizio VP50 HDTV20A no picture no sound
OK I checked the following voltages on the power supply board.
Vs = 209 Label states 207
Va = 63 Label states 63
I also checked the test point for 5v SB which measured 5.15v.
All of the voltage checks were done with X MAIN and Y MAIN disconnected. I noticed the power light on the front of the TV is amber when the tv is plugged in and turns green when I power the TV on . It stays green for about 25 seconds then I hear the power click off and light is amber again. There is a small board...Leave a comment:
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Re: Vizio VP50 HDTV20A no picture no sound
Don't worry I'm giving this thing the respect it deserves
. I just checked Vs Pin on X and Y connectors and it measures 209V DC. Sticker on panel says Vs should be 207V so I guess I'm ok there. There are also values on label for Va , Vsc, and Ve but I'm not sure where to check those. So I can assume my power board is OK then? I don't see any damaged componenents there. I realize the short in my buffers most likely is what toasted my Y-Main board because I've been reading that's pretty common with this set. Just wondering...
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Re: Vizio VP50 HDTV20A no picture no sound
Wow you guys are really quick on this forum! Here's my cheapo meter and a pic of my power board X and Y connectors. I see terminals maked Vs but nothing marked Va. Where can I measure that? I can check these voltages with power to tv ON and X/Y boards disconnected? I forgot to mention earlier that I do get orange light and relay click when I plug in the set and light turns green and seems to stay on for a while when I power ON....Leave a comment:
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Re: Vizio VP50 HDTV20A no picture no sound
OK this is a really dumb question but I am very new to this .I've read in other posts about powering the set on and checking all of the voltages on the power supply connectors. I'm assuming meter should be set to DC voltage for this? Should I connect my ground probe to the GND pin on the connector or touch it to the screws on the board standoffs? Thanks for quick reply by the way.Leave a comment:
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Vizio VP50 HDTV20A no picture no sound
I'm new to the forum and have spent the better part of 3 days trying to learn what I can about plasma TV troubleshooting and repair. I just picked up a Vizio VP50 HDTV20A 50" plasma for 50 bucks hoping I'd learn something repairing it but I opened her up yesterday and I'm starting to think I bit off more than I can chew. It's a Samsung Panel S50HW-YD02 and I've tried cycling though inputs with the Y-MAIN and X-MAIN disconnected (in turn and both together) but I'm not getting any sound. I looked at the Y-MAIN board and found a badly burned capacitor C5601 and 2 burned resistors right by the...
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