So I just picked this tv up and I plug it in and only one relay clicks when you press the power button. The guy said two used to click. So I check the power on the power board and the backlight and I think it was the inverter one or something like that were reading less then a volt meaning something is not sending enough power to turn the inverter on. Or the two inverters that are on the tv are bad. I don't really know where to start looking next. I visually checked out the main board and it looked ok. I checked all the fuses. And I checked all caps on the tv. What should be my next step.
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Re: Sony kdl52s5100. No picture no sound
Also I already checked the fuse on the t con board. And it read fine. I'm thinking either the backlight inverters are bad or the main board. Cause where I measured the back light power on the power board. The harness was going to the main board. And read like .384v dc. -
Re: Sony kdl52s5100. No picture no sound
Down load these two service manuals, I am downloading it right also.
http://elektrotanya.com/?q=showresul...oria=&kat2=all
Do you see any LED error codes?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: Sony kdl52s5100. No picture no sound
I tried downloading the service manual and capped out on my daily limit. But no led error codes which leads me more towards the main board.Comment
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Re: Sony kdl52s5100. No picture no sound
Got 5V standby from power board? It's steady?Please do not PM me with questions! Questions via PM will not be answered. Post on the forums instead!
For service manual, schematic, boardview (board view), datasheet, cad - use our search.Comment
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Re: Sony kdl52s5100. No picture no sound
I actually have 3.3v standby. And 3.3v on the pwr on after I turn it on.Comment
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Re: Sony kdl52s5100. No picture no sound
And it is steady at 3.3vComment
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Re: Sony kdl52s5100. No picture no sound
All the other pins read what's marked on the board.Comment
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Re: Sony kdl52s5100. No picture no sound
If it's not getting the correct standby voltage. That would lead to somethig messed up on the power board right? Also I have no problem turning the tv on and off with the power button.Comment
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Re: Sony kdl52s5100. No picture no sound
Service manual. I am surprised that there is no error codes at all.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: Sony kdl52s5100. No picture no sound
That's the wrong service manual. The model is kdl52s5100. And yea the green light lights up no problem and stas solid. Only thing I could think of is main board cause in the trouble shoot error codes it doesn't have one for a main board issue.Comment
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Re: Sony kdl52s5100. No picture no sound
So I got on another computer and looked at the service manual and it shows the standby voltage is supposed to b 3.3vComment
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Re: Sony kdl52s5100. No picture no sound
What does ac off det mean.Comment
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Re: Sony kdl52s5100. No picture no sound
Oops!, I upload the wrong one (was working on w5100).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: Sony kdl52s5100. No picture no sound
I have a kdl52s4100 been playing around with it for a while now, everything I've read and tested says its a bad main logic board, apparently for mine there is a repair service but I'm too cheap. Ill figure it out one day.Comment
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Re: Sony kdl52s5100. No picture no sound
That circuit detect if the input AC is too low or not, at normal that AC OFF DET pin will be high, if it is low, the backlights circuit will not allow to turn on.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: Sony kdl52s5100. No picture no sound
I wanna say if I remembered correctly when I metered it the ac det didn't read anything even while the tv was on.Comment
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Re: Sony kdl52s5100. No picture no sound
If you look at the SCH, the incoming AC is rectified by D6502 the b+ out will bias on MOSFET Q6501, which will ground out the bias for MOSFETQ6502 so the LED inside the opto PH6501 will be off, so the photo-transistor inside the opto will also be off so the Collector voltage of the opto PH6501 will be high.
So check the voltage of that circuit, make sure to use the correct ground point (the negative leg of the main filter) for the primary side of the circuit.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: Sony kdl52s5100. No picture no sound
10-4. I will try it in the morning once I get off work.Comment
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Re: Sony kdl52s5100. No picture no sound
So the ac det is reading the same voltage as the stand by voltage of 3.39v. And the back light is reading .389vComment
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Previous owner said TV just went blank one day.
They attempted to open the back panel and yanked the power connector off the power supply in the meantime.
Easily fixed that and got the TV to turn on. Backlights come one with everything connected. Good Sign.
The mainboard shows signs of life (red light on digital audio out is on) but that's about it. Good Sign.
There is not blinking LED and the most importantly there is LED response and sound when I press the MENU button on remote control. GREAT Sign.
I just downloaded the Sony KD-75X7800F Service Manual and... -
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