Hello,
I have 2 Samsung S22A300B (LS22A300BS/EN) monitors (Series SA300). The first one had a corrupted firmware and worked fine after reflashing.
The second one is a bit more difficult. I identified 2 defective components on the Signalboard (type BN41-01592B). The first one is IC600, a D9329 a 5V Switching-Regulator. The second one is the capacitor C604. This is an SMD ceramic capacitor and my problem.
I've found a service manual, on page 24 you can see the schematic but the text is not readable.
Does anyone have a better schematic file for this Board or...
blast32
Member
Last Activity: 10-20-2014, 06:01 PM
Joined: 07-17-2014
Location: Muttihausen
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Samsung SA300 dosn't start
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Re: Viewsonic VW2010wb doesn't start
Hi, I'm back.
Yesterday I have used another VGA-Cable. The picture was much better. Only on white Parts of the screen was a slight flicker. I don't think that this is a problem. The shadow is gone. Using DVI shows a perfect picture.
I think its time to reassemble the monitor.
Thank you for your help and ideas.
Sebastian -
Re: Viewsonic VW2010wb doesn't start
I have tried a factory reset. But nothing.
I'm the next 5 days not at home. When I'm back, I will test a DVI-Signal.
I agree with you lexwalker. I think its a wrong terminated highfrequency-signal. Reflektions could explain the error. Possibly the Diodes TVS1-3, maybe the VGA-Cable. But I think a high ripple at the 3.3V-line could explain it to.Leave a comment:
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Re: Viewsonic VW2010wb doesn't start
It lives!
The last 12 hours I spent in developing a flashtool for readout and reprogramm U8.
At first I have seen that the vendor used an ps25lv010 instead of an sst25lv010. The difference is an reduced commandset. But this is not really a problem. I have read it out and found out that the first about 300 bytes were zero. After I reprogrammed it with the new firmware it was time for a test.
The controls works fine, the backlight turns on and I see a picture.
But the repair is not ready.
...
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Re: Viewsonic VW2010wb doesn't start
OK, I identified the outputs of u6 and checked them for a shorted load. Nothing. The voltage looks also good. My next and probably last try is to exchange the flashmemory (U8). Unfortunately I have no device for programming yet. But it shouldn't be hard to develop one. I found the firmware online in a russian forum.
But this will now probably take a while.Leave a comment:
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Re: Viewsonic VW2010wb doesn't start
Tomorrow I'll check the voltageoutput of U6 for a shorted load. I was hoping someone have schematics for this part.
The screen is black. Or better I think its off....Last edited by blast32; 07-29-2014, 05:36 AM.Leave a comment:
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Re: Viewsonic VW2010wb doesn't start
Nothing on screen, no menu, no picture.
Here is the areapicture.
U6 is an AAT1164 (datasheet in post 1). Q5 is an MMBT4403 pnp-transistor.
I dont think that the regulatorcircuit itself is broken. Either the Load is shorted or one of the externel components of the switching regulator. But I'm not shure. I have no schematics about this part.
The Board is part of the LCD panel. I have found a datasheet, no schematics. The only interissting page here is page 10. It shows the Functional Block Diagram. I think...Leave a comment:
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Re: Viewsonic VW2010wb doesn't start
Yes, all fuses are good.Leave a comment:
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Re: Viewsonic VW2010wb doesn't start
They are marked. In FSP043-...pdf they are on page 2 in sector D1 and named "DBRT" and "On/Off".
The servicemanual shows the Pins on page 44 and named the signals BKLT_ADJ and BKLT_EN. The voltagelevel on both Pins is 0V. I think the controll-IC doesn't work korrekt and so the Transistorbases (service manual p. 44) of Q1 and Q2 were tied high about the pullup-resistor RA4 (service manual p. 47).
But I'm not shure about the IC since the osscilator works korrekt.Leave a comment:
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Re: Viewsonic VW2010wb doesn't start
Hello,
thanks for your reply.
No, I get the unit defective. So I never seen it working. The owner said there were no fault befor. From one day to another the device failed.
There are 2 Datasignals from the Control-IC to the powersupply. Both are to control the backlight, one activates the inverter, the other is for brightnesscontroll. I have disconnected both lines from the powersupply. Then I have connected two signales from an external supply to activate the backlight manually. The CCLF was connected to the...Leave a comment:
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Viewsonic VW2010wb doesn't start
Hello,
I have an Viewsonic VW2010wb-EU (Modell No. VS11674). If I connect it to 230V-net only the LED lights orange (duo-LED, amber and yellow lights). It doesn't react on any key. So the light is permanantly on.
The caps of the powersupply was swollen. The transistor Q5 and the stepup-controller U6 are realy hot. The PC recognize the display correct.
I have done the following things to repair it:
-change all caps of the powersupply (see picture, same capacity and voltage, low esr type, bought from local seller, i don't know which brand they are) -> powersupply... -
Re: New Members - please post your introductions here
Hello,
my name is Sebastian. I'm an german electro technican an engineer for information technology. Normaly I don't have to do with component level repair. But now I want to repair my Viewsonic LCD.
I hope you forgive me my bad english.Leave a comment:
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