Re: Sanyo DP50843 Won't power on.
Well after much fiddling around. I gave in and just bought a new main board. TV works perfectly now. Thanks to all who gave input.
tvprobs
Member
Last Activity: 11-18-2021, 10:56 AM
Joined: 08-13-2018
Location: Columbus
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Re: Sanyo DP50843 Won't power on.
OK. that makes perfect sense. I saw that on the back, but i haven't had that actually be a correct reading in the past. That's what i needed to know. I'll play around with the main board for a while and see what i come up with. Trying to dig in to these a little more on my own....Leave a comment:
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Re: Sanyo DP50843 Won't power on.
So for my understanding. When those signals are generated properly from the main board it will allow the power supply to run the 15V line at 15V instead of 12.5V? This then activates the inverter side of the PSU and supplies the 24V for the driver of the back lights?
Please correct if i'm missing a step or a connection....Leave a comment:
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Re: Sanyo DP50843 Won't power on.
The backlights do come on when those are jumpered. VCC and CNT pins have 5V and 4V respectively. No other pins are active on the inverter connections....Leave a comment:
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Sanyo DP50843 Won't power on.
Hello,
I have a Sanyo DP50483. TV won't power on, however i do get 5V standby. When i plug in the set it automatically gives PS_ON 3.1V and the LINE_OFF voltage drops. BL_ON and BL_DM never show signs of life. The voltages i get on the connections to the main board (Listed below) are all stable except PS_ON. The big miss i see in this system is that the 15V for the backlight never gets above 12.6V. Also the PS_ON is getting 3.1V, I don't know if that's enough to get the system to switch on the 15V backlight circuit (Or maybe i need the PS_ON to go low?). I tried connected a resistor... -
Re: Is this PSB still work saving???
UPDATE!!! Power supply is working.... TV is powered on. Sorry i wasn't able to post sooner, but it's been a couple days and we're still up and running. Thank you all for the input. Definitely stepped up my understanding a little bit.Leave a comment:
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Re: Is this PSB still work saving???
This is why i love this site. The details bring it all together for people like me trying to learn beyond the big picture of it. I've got the parts ordered and should have them early next week. Slowly stocking extras as i go for future use. I'll check back regularly in case there's any additional input or concerns that we haven't discussed.Leave a comment:
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Re: Is this PSB still work saving???
Thank you. just one last question. What's the best type of resistor for that R101A spot for longevity? Obviously there's a lot of voltage running through there and i want to be sure it's going to hold up. Is there benefit to a metal film vs. a carbon film?...Leave a comment:
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Re: Is this PSB still work saving???
Here are the pictures. I uploaded 2 from shop jimmy as it is the same board and shows all components in place.
I also have the IC FSQ510 showing the pin missing where it burnt up. There are also pictures of my board front and back. Not was well lit, but i can get better lit ones if needed....Leave a comment:
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Re: Is this PSB still work saving???
Ok, i'll have to do some research on TVS diodes. That one stumped me. Any idea what may have caused that drain pin to burn up? When i pulled the IC out the pin just came right off. Or should i look to just get power up and going on the board and see what happens? I uploaded the schematic that Bud found....Leave a comment:
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Re: Is this PSB still work saving???
So i pulled a few components that i suspected bad from the blown resistor all the way up to the IC labeled U101. Judging from the schematic R101 tests well at 4.7K Ohm. However, the diode D106A shows open either way i test it. It seems to have failed causing the burn up of the IC on the pin 7 Drain. I'm looking to replace this diode but can't seem to find anything online when i look up T2D89. Not sure what i should sub in for it. Any help there would be awesome. Once the IC, Diode, and Resistor are in place i think i can at least...Leave a comment:
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Re: Is this PSB still work saving???
FYI: Using the Shop Jimmy PHOTO!!!!
All diodes you listed seem to check out.
I tested the resistors R2 and R3 as they seem to match the resistor in the photo. They measured at 120 Ohm.
Also, I found U101 had a pin that was burned up. Following the trace of the burned pin, i found D106A appears to be bad and possibly the resistor at R101 is only giving a reading of 1.6 Ohms. I'll pull them out of circuit when i get time. However, I think this board has promise to be resurrected and...Leave a comment:
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Re: Is this PSB still work saving???
I measured and got 4.3K Ohm. Would that be pretty accurate even when it's burned up like that? Also, when replacing it should i use a different type of resistor. Looks like it should be a carbon film. Would there be benefit to changing to a different type or just get the same kind?
Thanks for your input by the way. It's extremely appreciated...Leave a comment:
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Re: Is this PSB still work saving???
Here's a picture of the resistor and the fuse. Somehow the fuse is still good, just got so hot that it "fused"(no pun intended) to the clip that was holding it on one side. I've checked other components in the circuit path and we seem to be ok. particularly the diodes (there are 3) immediately after the resistor before leading to other parts and they check out.
FYI. I'll likely keep this TV for now and replace the board altogether if i give it to someone i don't know. But if it's worth salvaging i would...Leave a comment:
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Is this PSB still work saving???
Hello,
This power supply had a resistor burn up in it. I'm curious if it's worth trying to save as there is a hole in it. Still seems pretty usable, but i've never had one this bad. Fuse did not blow, and other parts around it seem to be in working order as well. Cleanup on this has been minimal so far as i just wanted to be able to post pictures first. Also, if this is worth saving could someone help me identify the resistor needed to throw in there. Board is and LG 2300KEG031A.
thank you...Last edited by tvprobs; 07-23-2019, 04:27 PM. -
Re: Samsung UN55H7150FXZA Dim Picture
That was my first thought, but as i have little experience with the back light and the symptoms kind of flipped i wanted to be sure there was not more troubleshooting I should be doing....Leave a comment:
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Samsung UN55H7150FXZA Dim Picture
Hello,
A family member brought me a TV that initially had an issue with a completely dimmed top half back light issue. Flashlight test proved picture was there. When i received it and powered it on. The middle backlight was dimmed, but the Top and bottom appear 100% illuminated. I haven't had experience with power supplies combined as inverters and i'm unsure how to check the voltages to determine power supply issues or backlight issues. Pictures of the power supply are attached. The inverter cables are disconnected as i was measuring voltage for the + pins both plugged in and not... -
Sanyo DP50E84 backlight, no picture
Hello All,
I inherited a busted Sanyo DP50E84. The symptoms are no picture, but has backlight and has sound. I went through and found no issues with the power supply that i can tell. If it is, then it's hiding itself. Anyway, the cheap option and guess was the T-con board. I purchased new (shopjimmy) and swapped it out. Picture for a few seconds, then pixelated and crazy then black screen again with backlight.
May i assume that this is a main board issue? or are there more details needed to make that jump. Also, would i need to purchase another T-con board or is... -
Re: Hpt5054 no power no clicking
So update on the TV front. After working back through the board after the testing above and pulling some components just to be sure they were good. I found that on top of 1 cap being low. There were blown joints on the second relay. TV has been up and running for over an hour and seems great. Thank you all for the help. It definitely pointed my in the right direction to finally solve this case. I had been working on it for a while.Leave a comment:
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Re: Hpt5054 no power no clicking
OK. here's what i've found so far.
OFF STATE:
QQ803 E: 20.2V C: -0.03V B: 20.3V
QQ851 E: 0V C: 0.09V B: 1.8V
QQ810 E: -0.05V C: 0.18V B: 0.18V
Resistors match the output
ON STATE (PS_ON goes to ground 0V):
QQ851 E: 0V C:1.4V B: 0V
Opto-coupler getting +.9V on anode 0V on cathode
QQ810 E: 0.7V C:0.2V B:0.2V
QQ803 E:19V C: 12-13V B: 19V *****These voltages are bouncing.
ICQ...Leave a comment:
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