Hanspree "Unknown Model" 32" LCD: No picture or sound, power LED
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Re: Hanspree "Unknown Model" 32" LCD: No picture or sound, power LED
I have never seen the inverter transformer with that high DC resistance (~9K).
The pin out should be the same as yours transformer.
http://lcdparts.net/TransformerDetai...ProductID=2772Never 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: Hanspree "Unknown Model" 32" LCD: No picture or sound, power LED
I have never seen the inverter transformer with that high DC resistance (~9K).
The pin out should be the same as yours transformer.
http://lcdparts.net/TransformerDetai...ProductID=2772Please 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: Hanspree "Unknown Model" 32" LCD: No picture or sound, power LED
If I am correct, one transformer drives two lamps, as you can see, there are two high voltage windings on the transformer.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: Hanspree "Unknown Model" 32" LCD: No picture or sound, power LED
Okay - that makes a bit more sense. So I might have been checking them in series, but I get >66Megohm resistance (OL on my meter) between any other pins.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: Hanspree "Unknown Model" 32" LCD: No picture or sound, power LED
The two pins on each end are for the each winding as shown in the link. You can take one out a nd you can easily see what I am talking about.
By the way, is the board made by DARFON?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: Hanspree "Unknown Model" 32" LCD: No picture or sound, power LED
Got the inverter in front of me right now. The transformer wiring from budm's post (the lcdparts.net link) doesn't match. If I go by that, all primaries (on all transformers) measure open.
Transformers on mine are labelled "6800 M 0722G-"
Not quite sure wtf is going on with the results, but this inverter was working fine. Before disassembling the TV (cracked panel, only 1/3rd still visible) it ran through a 7 hour nonstop test without any hiccups.
edit: Inverter is a DAC-24T042 Rev. 05A by Delta Electronics (?)Last edited by Scenic; 03-26-2012, 11:24 AM.Comment
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Re: Hanspree "Unknown Model" 32" LCD: No picture or sound, power LED
That's similar to my results, except the outer transformers measure 90k each on all secondaries. (One measures 98k, which is suspect.)
I will check later for drive waveforms... I have a feeling the inverter controller IC is dead.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: Hanspree "Unknown Model" 32" LCD: No picture or sound, power LED
Hi Scenic, are those the resistance reading on your transformers also, seems to match what TOM is seeing. Look like we need to remove the transformer from the board and see how they are wired up.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: Hanspree "Unknown Model" 32" LCD: No picture or sound, power LED
this is what you should be measuring from budm's link, make sure your meter is set to the lowest range for 0.8 ohm tho, i did mine in circuit so as long as there not well out and all connectors are off the board you should be able to get the correct or there abouts readings, they may appear to be short if your meter is set to the wrong range because 0.8 ohms is nothing some meters might not measure this depends how good your meter is.
how are you measuring to get 90k-98k?
hope this helpsLast edited by shepp; 03-26-2012, 12:26 PM.Comment
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Re: Hanspree "Unknown Model" 32" LCD: No picture or sound, power LED
Makes more sense, thanks. Now getting consistent ~700 ohm (+/-1%) readings.
I can only find one primary on each transformer, they all test 0.3-0.4 ohms.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: Hanspree "Unknown Model" 32" LCD: No picture or sound, power LED
Shepp's picture is the same as the one in the link, now I am confused! It has only one primary windings, and two high voltage windings, two MOSFET's for the two primaries of the transformers in series driven by half bridge setup. All the readings are in DC resistance, the impedance will be higher, and you need the ringer tester to find out if it has shorted turn or not.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: Hanspree "Unknown Model" 32" LCD: No picture or sound, power LED
p1 and p2 are first primary, p3 and p4 are second primary, and s1 to s2 and s3 to s4 for secondary windings in respect to 1st primary and 2nd primary
what do you mean by dc resistance? resistance is ohms? there is no dc or ac in resistance measurement? thats why you never check resistance when power is on...you will blow your meterLast edited by shepp; 03-26-2012, 12:41 PM.Comment
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Re: Hanspree "Unknown Model" 32" LCD: No picture or sound, power LED
This why I am confused:
"Got the inverter in front of me right now. The transformer wiring from budm's post (the lcdparts.net link) doesn't match. If I go by that, all primaries (on all transformers) measure open." per post 27. I think we still need to see the actual pictures of the transformer in question.Last edited by budm; 03-26-2012, 12:44 PM.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
-
Re: Hanspree "Unknown Model" 32" LCD: No picture or sound, power LED
Got the inverter in front of me right now. The transformer wiring from budm's post (the lcdparts.net link) doesn't match. If I go by that, all primaries (on all transformers) measure open.
Transformers on mine are labelled "6800 M 0722G-"
Not quite sure wtf is going on with the results, but this inverter was working fine. Before disassembling the TV (cracked panel, only 1/3rd still visible) it ran through a 7 hour nonstop test without any hiccups.
edit: Inverter is a DAC-24T042 Rev. 05A by Delta Electronics (?)Comment
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Re: Hanspree "Unknown Model" 32" LCD: No picture or sound, power LED
all the primarys should be roughly the same and all the secondarys should be roughly the same, ive only marked one side but the other side should be mirror image for readings, they should all be slightly differant by a fraction, but look for any that are well out compared to the others
picture as per SCENICs uploadLast edited by shepp; 03-26-2012, 12:59 PM.Comment
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Re: Hanspree "Unknown Model" 32" LCD: No picture or sound, power LED
One thing is that you are looking at the bottom view of the transformer, when you look at the top view as it is mounted on the PCB, then you can see that the Primary pins are connected to the traces close to the MOSFET's. the other two top pins will read zero. And that is why there is marking for pin 1 on the PCB for proper mounting of the transfromer.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: Hanspree "Unknown Model" 32" LCD: No picture or sound, power LED
thats irrelevent, because your still measuring top to bottom pins not left to right etc, so you should still get correct readings across the correct pins, even if 2 primarys are connected you are still only measuring 1 winding so should still get the readingComment
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Re: Hanspree "Unknown Model" 32" LCD: No picture or sound, power LED
Okay, so I checked the waveform at the transformer primary pins using a scope.
Completely dead, nothing, zip, nil, nada.
Fuses are good, so controller's probably shot. I'll have to replace the heating element in my Aoyue 968 before replacing that IC. Unless anyone has an inverter going spare (Scenic...?)
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: Hanspree "Unknown Model" 32" LCD: No picture or sound, power LED
But there are no wires attach to the P2 and P4, you can see the wire wrapped around P1 and P3. I look at my similar transformers I have, only one primary winding and two secondary winding, you can also see the white triangle marking on the footprint of the transformer. Unless my transformers are not the same setup as his, that is why we need to see the bottom side of the transformer.Last edited by budm; 03-26-2012, 01:54 PM.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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