Re: Emerson hdtv troubleshooting
look at post 14..budm gets clear pics from shopjimmy
look at post 14..budm gets clear pics from shopjimmy
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Re: Emerson hdtv troubleshooting
I tried tracing back the all 5volt with pic from post #14,but having a hard time,any one have better eyes then me?Proud owner of dozens of broken TV's and many,many,many boards.
Our website and passion:http://hollenhundshepherds.com/Comment
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Re: Emerson hdtv troubleshooting
any better pics that can be found?Comment
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Re: Emerson hdtv troubleshooting
Try this service manual, per shopjimmy, this model uses the same power supply.
Never stop learning
Basic LCD TV and Monitor troubleshooting guides.
http://www.badcaps.net/forum/showthr...956#post305956
Voltage Regulator (LDO) testing:
http://www.badcaps.net/forum/showthr...999#post300999
Inverter testing using old CFL:
http://www.badcaps.net/forum/showthr...er+testing+cfl
Tear down pictures : Hit the ">" Show Albums and stories" on the left side
http://s807.photobucket.com/user/budm/library/
TV Factory reset codes listing:
http://www.badcaps.net/forum/showthread.php?t=24809Comment
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Re: Emerson hdtv troubleshooting
Budm,what would we do without you?Proud owner of dozens of broken TV's and many,many,many boards.
Our website and passion:http://hollenhundshepherds.com/Comment
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Re: Emerson hdtv troubleshooting
Diagram for the power supply board. It looks real close to the OP board.Never stop learning
Basic LCD TV and Monitor troubleshooting guides.
http://www.badcaps.net/forum/showthr...956#post305956
Voltage Regulator (LDO) testing:
http://www.badcaps.net/forum/showthr...999#post300999
Inverter testing using old CFL:
http://www.badcaps.net/forum/showthr...er+testing+cfl
Tear down pictures : Hit the ">" Show Albums and stories" on the left side
http://s807.photobucket.com/user/budm/library/
TV Factory reset codes listing:
http://www.badcaps.net/forum/showthread.php?t=24809Comment
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Re: Emerson hdtv troubleshooting
so what gets tested next?Comment
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Re: Emerson hdtv troubleshooting
Sry,been busy doing yard work etc. was hoping someone would jump in. Lol. I downloaded the schematics. Will check in a few hours.Proud owner of dozens of broken TV's and many,many,many boards.
Our website and passion:http://hollenhundshepherds.com/Comment
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Re: Emerson hdtv troubleshooting
See pic....
Red probe on the leg of D637,black on chassis of tv,meter on 200volt scale DC...
What voltage do you read there...Attached FilesProud owner of dozens of broken TV's and many,many,many boards.
Our website and passion:http://hollenhundshepherds.com/Comment
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Re: Emerson hdtv troubleshooting
I apologize..my electricity was out here again because of wind..anyway concerning the last check the card isnt connected to the tv, so what else can I use to put the black probe on besides the chassis of the tv?Comment
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Re: Emerson hdtv troubleshooting
You can use one of the wire jumpers that is marked GND Has to be on the COLD side
example J1086 in the picture straight down from the big red 2.Please upload pictures using attachment function when ask for help on the repair
http://www.badcaps.net/forum/showthread.php?t=39740Comment
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Re: Emerson hdtv troubleshooting
8.83vComment
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Proud owner of dozens of broken TV's and many,many,many boards.
Our website and passion:http://hollenhundshepherds.com/Comment
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Re: Emerson hdtv troubleshooting
***just to be sure,you measured on the leg of D637 that's in the circle,correct?****
Let's assume you did,now right next to D637 you see a smaller diode D648,can you desolder one of it's legs(doesn't matter which one)so it's out of the board and then re-measure the same leg off D637? Still 8.83volt?
D648 is parallel between GND and the 24 volt line,I'm thinking that if D648 is leaking(halve shorted) it could pull down the 24 to 8.83 and also affect the all 5volt line a bit(4.43volt) as they both come out of the same transformer.D648 being a zener diode,when the voltage spike happened,it might have seen a over voltage and could have sustained damage as it was trying to dim the spike...just a thought....Last edited by martino; 07-25-2014, 04:58 PM.Proud owner of dozens of broken TV's and many,many,many boards.
Our website and passion:http://hollenhundshepherds.com/Comment
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Re: Emerson hdtv troubleshooting
yeah I will desolder it when I get off of work tonight and give you the results tommorrow.Comment
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Re: Emerson hdtv troubleshooting
it came out to be 9.21 voltsComment
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Re: Emerson hdtv troubleshooting
hmm...I'm wondering if T600 get's driven correctly...24v=8.83,5v=4.43 etc....
With meter on 200volt DC(just to be safe) can you measure across the legs of diode D604?red probe on one leg,black probe on the other
It's right below the 2 white resistors on the HOT side(careful).
It should read 3.7 volt DC. I say,use 200 volt scale just to be safe,if you do see 3. something,you could turn scale to 20 volt.Proud owner of dozens of broken TV's and many,many,many boards.
Our website and passion:http://hollenhundshepherds.com/Comment
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Re: Emerson hdtv troubleshooting
I would like to get budm in here now too,lol.... It's a fairly simple power supply,but the lower voltages it's given us is confusing me a bit,it's functioning but not on full 100%.
Budm,I'm thinking Q600/Q601 circuit being drawn down?Last edited by martino; 07-30-2014, 11:59 PM.Proud owner of dozens of broken TV's and many,many,many boards.
Our website and passion:http://hollenhundshepherds.com/Comment
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Hello from France,
mon2 kindly advised me to post a thread to ask the question(s) I'm concerned about. I'm new to the forum and I'm looking for practical courses for troubleshooting pc motherboards especially laptops in Europe, if possible in France. I have been a computer network system administrator and a corrector of administration modules for automated programs under Unix. But I really miss the practical "ops" side of troubleshooting. So I would like to start from the beginning: 1.8V, 3.3V, 5V and 19V tests for example, etc...
Do you think this is feasible for me? I... -
The issue with this video card is the HDMI port. Specifically on pin 19 (Diode checks on all other pins are normal). When i do a diode check on it from the pin on the board itself, I have nothing. There is also no short on the pin. Resistance reads about 200k. Normally on any HDMI pin 19 I would expect some voltage drop anywhere from .5v to 1.2v but here, I have nothing. The card is operational and can be used via the displayPort ports, but not through the HDMI. Attached you will find the pdf schematics for the card on page 22. I have verified that all of the resistors on this line before the...07-25-2024, 09:49 AM
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Hello all,
As the title states, I followed the troubleshooting guide located here: https://www.manualslib.com/manual/23...page=53#manual, which concluded the 'A' board needs to be replaced. Looking around the net and eBay, I see that there are repair services for the board (TNPH1043UE? Not sure if it is a 'UE' as the suffix grid does not appear marked). What additional troubleshooting can be performed to ensure 1) this board is the problem and 2) since there are repair services, what are they fixing on the board?) I expected 3.3V not to be available anywhere... -
I’m looking for some advice troubleshooting an old Chiefmax 650w power supply in a PC, if it’s advisable to dig into it.
Worst case I can replace the PSU, I’m just interested in learning the troubleshooting process. However, it’s out of my area of expertise and I could use some direction.
During PC operation I heard a loud pop noise, like a cap gun and the tower lost power.
Initially there is no power output 3.3v, 5v, or 12v when jumping the power on pin to ground. Also, no fan power.
Opening the PSU the only things visible initially... -
Hello!
Unfortunately my Lenovo L14 Gen 1 (motherboard NM-C741) was involved in a terrible mishap. At first, one of my friends accidentally spilled coffee on it which made some of the ports stop working but the computer worked fine otherwise. After that I stupidly opended it and forgot to disconnect the battery... One thing leads to another and I accidentally short it between two components (unfortunately I do not remember which components). After that I get nothing, no charging indication, no boot indication, no fan spin, nothing.
So I'd love to learn my mistakes and...
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