Hello, I came here after finding some similar questions asked on other monitors and hope someone here can help me get an ancient Viewsonic VP230mp (23" 4:3 LCD) back to working condition.

First a little background, I have a background in computer and electrical engineering, and I'm smart enough to know I know nothing about LCD displays and how they work. For this topic I'm as green as they come.
When the display is turned on the viewsonic logo displays in the uppper left for 2 seconds then the screen goes black, the power LED is green (on) and when a computer is connected...

Hi, Badcaps.

I am troubleshooting a monitor
Viewsonic VX2718-PC-mhd.
Panel model SG2701BSG2701-8
Symptoms is no image.

This panel has 2 panel board connected by a U-ribbon.
When I disconnected the ribbon, I get a perfect half screen image.
I took some test point voltage, when ribbon disconnected.
HVAA 8.38v
FVDD12 1.21v
FDD33 3.3v
VIN 11.79v
VAA 16.85v
VGHF 30.16v
VGL -8.02v
CK1_I ~ CK8_I 1.403v
CK1_L ~ CK8_L 8.26v

When I connect both panel board
HVAA, VGHF, and CKx_L...

Hi everyone,

I have a dps-162kp-1 runtka932wjqz powerboard wich has no power at all on the cold side.
I replaced ic7903, r7900, R7902, C7901, d7950.
Checked the diodes around the chip and also the caps.
On the ic pin 5 no voltage, pin7-8= 315V
On the T7901 pin 1-4 no voltage, pin 2-3=315V
Anybody have any idea where to look further?

Any help is welcome
Thanks Danny from holland

Hello, guys. I fixed a monitor the other day, but I don't have a strong understanding of electronics and was curious about how the PFC and a couple of mosfets on the powerboard blew out. Here is what was known about the monitor:

I bought it "as-is" hoping to salvage it for replacement parts. However when I plugged it in it powered up and worked fine for about an hour. After that the monitor's power would be very irratic and turn off and on several times. I opened it up and noticed that the mainboard had a faulty heatsink on the main BGA chip. Not only was it not making...

I have à defective Viewsonic monitor. I can't find a circuit diagram for it' power supply.
Model #EADP-64BF B
The user manual have all diagram except for the power supply. I would appreciate help to find the circuit diagram, thanks...