Re: HP ZR2740W troubleshooting
Here is a picture of the driver board and close ups of a few parts that look somewhat melted? Taking a cue from stj and post #18 I looked at the tops of some of the chips on the driver board and I cannot read much on the tops of these 2 chips U20 and U502 because they seem to be melted... I cleaned them off with some alcohol before it took the photo...
Stifle9
Member
Last Activity: 02-13-2015, 10:56 AM
Joined: 03-24-2014
Location: Riverton
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Re: HP ZR2740W troubleshooting
I had already written down the series but I neglected to include it with list of info I supplied before.
All caps are Lelon brand:
2x 250V 220μF A114(M) [B]RPL 105ºC[/B]
6x 50V 220μF A101(M) [B]RZW 105ºC[/B]
3x 50V 100μF A040(M) [B]RXW 105ºC[/B]
1x 25V 470μF A110(M) [B]RXW 105ºC[/B]
6x 16V 1000μF A114(M) [B]RZW 105ºC[/B]
2x 25V 680μF A114(M) [B]RZW 105ºC[/B]Re: HP ZR2740W troubleshooting
I had already written down the series but I neglected to include it with list of infoLeave a comment:
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Re: HP ZR2740W troubleshooting
stj - I think that I did test those rectifier diodes that sit between the transformers and the capacitors in post #16?Leave a comment:
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Re: HP ZR2740W troubleshooting
I have access to a digital power supply that could produce up to 18V and 3A (prob not at the same time lol).Leave a comment:
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Re: HP ZR2740W troubleshooting
ok, here are the ID's for the IC's: (there are 3 lines on each, separated by |)
I810 & I814: Z103WA | (Texas instrument symbol?) 13M | ATZE [U]G4[/U]
I815: UTC NLCA | LM358G | 01Re: HP ZR2740W troubleshooting
ok, here are the ID's for the IC's: (there are 3 lines on each, separated by |)
I810 & I814: Z103WA | (Texas instrument symbol?) 13M | ATZE [U]G4[/U]
I815: UTC NLCA | LM358G | 01Re: HP ZR2740W troubleshooting
ok, here are the ID's for the IC's: (there are 3 linesLeave a comment:
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Re: HP ZR2740W troubleshooting
give me an idea of which 3 "ic"'s you are talking about and I can search for identification markings on them.Leave a comment:
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Re: HP ZR2740W troubleshooting
ok the results are as follows from testing what Davi.p suggested:
Testing Rectifier Diodes on back of power board.
Tested the 12 sequentially numbered in order from D814 to D830 and they all tested between 5.12k ohms and 5.34k ohms.
Testing P803, pins 1 and 11 with adjacent ground pins. Test conducted in the same manner (everything hooked up with life video feed coming to monitor, power switched on then button powered on, monitor flashes on/off about 2 seconds afterwards then screen remains dark)
Pin 1 showed...Leave a comment:
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Re: HP ZR2740W troubleshooting
I imagine the backlight controller chip is not on the power board that I have attached pictures for. I can visually inspect the chip to see if anything looks amiss if you give me an idea of what it looks like and where it might be. There are several other boards that I can see attached to the video board.
ill run those tests that momaka has outlined and report backLeave a comment:
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Re: HP ZR2740W troubleshooting
The monitor is a 27in yes and not many in the school are this large but as it represents a significant investment initially, I thought that I could give it a try.
I assumed in my testing of P804 that all of the ground wires were essentially common so in testing I placed the common/anode on the Multimeter on pin 1 and left it there while moving the cathode/live from pin 2, 4, 6, 8, 10, 12... I think that I may have made a mistake here in testing P804...
How should I test P804 for output voltage if not the way I did it the...Leave a comment:
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Re: HP ZR2740W troubleshooting
Looking for some more insight on this issue if anyone can help. Sorry to be a pain and bog up the boardLeave a comment:
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Re: HP ZR2740W troubleshooting
Shameless bump - really interested in getting this problem resolved
Would the slow leaking of voltage from the P804 block after the flash mean that the capacitors on the power supply board were bad?
I have recorded the list of capacitors though I have no idea where I could acquire a set of replacements, I could use some help with that if it would be a good idea given the data so far. I dont even know where to start or what style of caps to order.
All caps are Lelon brand:
2x 250V 220μF A114(M)...Leave a comment:
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Re: HP ZR2740W troubleshooting
Ok so here goes the testing results from budm's suggestion to test the DC voltages out from block P804 (pics of setup attached).
Every cable for normal operation of the monitor is attached sans the USB hub from the controller board. The power is switched on and the monitor is powered on via the power button for each test. The monitor is being fed a live signal through the DVI port before the monitor is powered on.
COM lead is stuck to 1.GRD for each test and live test lead is moved through the even numbered pins to check...Leave a comment:
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Re: HP ZR2740W troubleshooting
I have the monitor torn apart on my desk in my classroom at school so I will get back to it and start testing that on Monday budm, thanks for the suggestion. So I will connect everything together but keep the power board open to test with my MM for voltageLeave a comment:
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Re: HP ZR2740W troubleshooting
Does anyone have any experience with this monitor or problems similar to what I have described above?
Could I give any further description that would help out?Leave a comment:
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HP ZR2740W troubleshooting
First time poster here, hoping to get some insight into what is going wrong with this monitor.
Monitor History - HP ZR2740W, given to me because it was faulting, I accepted it because of the retail value and possibility of resurrecting. I was told that it had been used for the past year and that the person I got it from was told that it was probably a back-light issue.
The issue - The monitor has a repeatable fault where if the power supply (separate switch near power cord) is turned on and the monitor is being fed a display signal (through DVI, checked with another... -
Re: New Members - please post your introductions here
First timer to the electronics repair scene, at least at this level. I have done a bit of tinkering with the odd project here and there. I have just recently become interested in the Monitor repair side of my interest in hardware because I inherited a decently specced IPS panel. Now to troubleshoot until i get bored again
BTW - I'm a High School Physics teacher that knows much of the theory but is more interested in the practical side of DIY/live on the waste of society, etc.Leave a comment:
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