Author Topic: Need help repairing my monitor  (Read 1970 times)

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Offline MassDestruction

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Need help repairing my monitor
« on: July 10, 2017, 11:26:41 am »
Hi Everyone

I'm currently trying to repair my computer monitor. The problem I'm encountering is that the hdmi port randomly goes out. I opened it up and it seems like a Zener Diode blew up. I have an image of the crusty diode below. Looks like it burned a tiny bit of the board as well. I also visually checked the caps and they look fine. So the question I have is how do I figure out what Zener Diode to replace it with? I've tried searching for a schematic with no luck. Also as a result of the Zener Diode blowing up is there anything else I should be looking for in terms of damage? The brand and model # of the monitor is the Asus VH236H. The board # is 715G3221-2

Crusty Zener Diode


Full shot of the pcb.


Board Model number
« Last Edit: July 10, 2017, 12:47:37 pm by MassDestruction »
 

Offline madires

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Re: Need help repairing my monitor
« Reply #1 on: July 10, 2017, 12:02:36 pm »
Manufacturer and model would be helpfull. And if you don't wan't to pay for photobucket please look for another image hoster or upload your images directly.
 

Online kripton2035

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Re: Need help repairing my monitor
« Reply #2 on: July 10, 2017, 12:15:14 pm »
"visually checking the caps" isn't checking the caps...
get yourself an esr meter it will help you in almost all your repairs.
or build one from the links below.

Offline MassDestruction

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Re: Need help repairing my monitor
« Reply #3 on: July 10, 2017, 12:45:40 pm »
Manufacturer and model would be helpfull. And if you don't wan't to pay for photobucket please look for another image hoster or upload your images directly.

Wow thanks for pointing out what photobucket was doing. So annoyed right now  |O. I updated the opening post with the Brand, model, and board number as per your suggestion. The images have been updated too. Thanks for pointing that out.
« Last Edit: July 10, 2017, 12:48:21 pm by MassDestruction »
 

Offline MassDestruction

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Re: Need help repairing my monitor
« Reply #4 on: July 12, 2017, 06:01:31 am »
So I managed to find what the Zener Diode is. It is a RLZ 5.6B LLDS. I managed to find the service manual on the net with full board schematics. For anyone interested in this monitor they can find the schematic here https://elektrotanya.com/asus_vh232h.pdf/download.html
 

Offline EPTech

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Re: Need help repairing my monitor
« Reply #5 on: July 14, 2017, 12:25:33 pm »
Also, be sure to check the resistor, if any, that is in series with the zener. If a zener fails, the resistor will follow in many cases.
Kind greetings,

Pascal.
 

Offline chhrisedwards

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Re: Need help repairing my monitor
« Reply #6 on: September 18, 2017, 01:52:02 pm »
To repair the computer monitor, First do the visual inspection of PCB with the help of technical tools and then replace the damaged part if found. Now, check all the components working properly or not.
 

Offline perieanuo

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Re: Need help repairing my monitor
« Reply #7 on: September 18, 2017, 03:49:33 pm »
It's soldering problem between connector up to main processor or power module issue, bad caps or bad soldering. Check first one, if you have a scope check processor voltage stability. Regards, pierre

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