Re: DELL P2210 - SMPS +5V reads ~+3.5V
Hi,
Little update. First display is ok but the second one keeps burning dual Mosfet. Inverter and motherboards seems to work ok for about 5 seconds but after that Mosfet is shorted again and power led goes off.
About display layers everything is OK but the Mylar reflective side must be placed face up....
o3365566
Member
Last Activity: 12-29-2017, 08:11 AM
Joined: 11-07-2012
Location: paris
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Re: DELL P2210 - SMPS +5V reads ~+3.5V
Unfortunately I don't have the service manual for this revision.
At the moment I think I found failed components but if the problem is not solved I will post some photos....Leave a comment:
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Re: DELL P2210 - SMPS +5V reads ~+3.5V
I think you're right... again!
The dual MOSFET seems shorted. I will try to replace it and see.
Spare parts are on the go. I will write back as soon as I receive them.
Off topic: I reassembled the LCD panel after months and I forgot the right order of the different layers. What I did is (bottom-up):
1. White sheet
2. Fiber optic glass
3. Slim plastic sheet
4. Mylar sheet
5. Thick plastic sheet
I think everything is good but I have some...Leave a comment:
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Re: DELL P2210 - SMPS +5V reads ~+3.5V
I think too.
I tried to isolate the inverter and correct voltages were back but I grilled a resistor that started to smoke...
Would it be a good idea to desolder some pins on the inverter transformer to find the shorted component?
Any other suggestion for troubleshooting this kind of problem?...Leave a comment:
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Re: DELL P2210 - SMPS +5V reads ~+3.5V
Thanks for the answers. My meter (a Finest 201) definitely doesn't have zeroing but as budm said. I don't think R853 failed.
The diode to replace is marked SR520 and datasheet says it's a 20V. Anyway I ordered a 200V one for replacement to be sure...
And now some news. A colleague gave me another DELL P2210 which doesn't power on. I opened it and surprise: the power board it's completely different!
Daughter-boards are replaced by smd components and schematics doesn't apply anymore. I started investigating and...Leave a comment:
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Re: DELL P2210 - SMPS +5V reads ~+3.5V
Any way to check this?
And what about voltages? In the SR520 family there are diodes with reverse voltages till 100V. I wonder if it would be better to replace a 20V with a 60V or 100V. Normally the price is the same.
Are there other specifications to look for?...Leave a comment:
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Re: DELL P2210 - SMPS +5V reads ~+3.5V
I agree.
But how avoid diodes in parallel? In my case, could it be a solution and a better design to replace 2 Shottkys of 20V 5A with only one of 20V 10A?
Shorted probes reads 0,6 Ohms. So I think R853 measure is correct, am I wrong?...Last edited by o3365566; 09-04-2015, 03:15 AM.Leave a comment:
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Re: DELL P2210 - SMPS +5V reads ~+3.5V
I think I found it. D854 is shorted. I desoldered one of the lead and +16V and +12V are there! However I still didn't tested the display because I don't have a replacement for the diode and I'm afraid that working with only D855 could cause more damage.
I will post final test result as soon as I receive a replacement for D854.
One strange thing is that R853 that is marked as 0.2 Ohm reads only 0.1 Ohm. I wonder if it is OK or if I must replace it too.
@fzabkar: Thank you very much for your precious...Leave a comment:
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Re: DELL P2210 - SMPS +5V reads ~+3.5V
I finally changed both but nothing changes.
I'm not sure about it. It seems that they follow separates paths with different output from T850.
C865/C862: 0V
C884: ~+4.3V (interesting!)
I don't think it is a power saving mode because the service manual clearly states at page 17 that "When power cord plug into AC socket, Power provides 24V and DC_5V. DC_5V is main voltage for panel and Regulator U101." so I think that...Leave a comment:
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Re: DELL P2210 - SMPS +5V reads ~+3.5V
I'm afraid the problem is before Q890 because I tested voltage output from the transformer T850-01 (T850 is not present on my board) and I didn't found any voltage.
I measured +16V output on R888 resistor, +12V output on R877 and everything reads 0V.
If the problem is Q890 I would have +16V and +12V output, am I wrong?
Could it be Q850 that failed?
If Q850 fails I would still have an output of +3,5V?
Thanks for your answers!
@stj: On the board remains only two other little electrolytics...Leave a comment:
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DELL P2210 - SMPS +5V reads ~+3.5V
Hi,
I've a DELL P2210 LCD that doesn't power on. Power led is off too. It seems completely dead.
I replaced all the capacitors but no change. Original capacitors however seemed OK.
Fuse is OK and the bridge rectifier seems OK too. When the power cord is plugged I read ~+3,5V instead of +5V on the connector towards the logic board. I'm stuck! Any suggestions?
I've a DMM and a digital scope. What else may I check?
Thanks!
PS: Service manual is in attachment.... -
Re: Sony 46w5500 repaired but wrong model number
OK, I understand. In effect I was talking about the number is printed on the board. I will check the reference number on the sticker too. Thanks!...Leave a comment:
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Re: Sony 46w5500 repaired but wrong model number
Really? Is it possible to have motherboards with differents parts but exactly the same reference number?...Leave a comment:
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Re: Sony 46w5500 repaired but wrong model number
Great! Could you explain some more on service mode 2 change? What document is the photo from?
My service manual for EX2L-Basil CHASSIS doesn't have any details about service mode configuration. It tells just how to enter and save data but no explanation about different parameters.
Thanks!...Leave a comment:
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Re: Sony 46w5500 repaired but wrong model number
Another good reason!...Leave a comment:
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Re: Sony 46w5500 repaired but wrong model number
No and... yes!
I have different reasons:
1. The first one is that it took me about 3 months of worldwide search to find the right motherboard with exactly the same reference number. Many other cards were availables which looked exactly the same but with different last 2 digits in the reference number. Vendors told that they didn't know if they could work in my tv or not. Thay talk about different firmware versions so I thought that being capable of reprogramming the firmware could make easier...Leave a comment:
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Sony 46w5500 repaired but wrong model number
Hi,
During a storm my 46w5500 was dead with 8 red blinks.
I successfully repaired it replacing the motherboard with an used one (with the same reference).
However in the system menu I have 40W4710 as model number.
I think that the model number is stored in the motherboard firmware. I'd like to know if is it possible to change it and how?
I think that a service tool from sony exists to do that. Am i correct?
Otherwise I located 2 eeproms on the motherboard and probably the firmware is stored there. I could prabably dump the old one from the broken motherboard... -
Re: Sony LCD KDL-37W5500 - 8 times blink red
Hi mijatovic86,
Sorry to relive this old post but I have the same problem with my 46W5500. 8 blinks after a storm lightning near my house.
Switched the power board with another one and I've the same 8 blinks. Now I think it's the main board which is faulty.
Did you succed in repair yours?
Thanks!Leave a comment:
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Re: White screen on Chimei CMV222H
I'm sorry! I updated old thread with a link to this one.
At home I will post pictures of the board and info about caps.Leave a comment:
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Re: Chimei CMV222H fuse identification
I didn't find a way to change the thread title so I created a new thread for the new problem here:
[URL="https://www.badcaps.net/forum/showthread.php?t=24273"]https://www.badcaps.net/forum/showthread.php?t=24273[/URL]Re: Chimei CMV222H fuse identification
I didn't find a way to change the thread title so I created a new thread for the new problem here:
[URL="https://www.badcaps.net/forum/showthread.php?t=24273"]https://www.badcaps.net/forum/showthread.php?t=24273[/URL]Leave a comment:
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