Westinghouse 19" Power/Inverter

[PincushionMan]

I believe this Westinghouse 19" widescreen is a rebranded Optiquest. Won't power up when plugged in. A lot of the parts inside say ViewSonic or OptiQuest. The Power/Inverter board is a DELTA, which outputs both 5Vdc, 3.0A and (inverter) 1250Vrms, 4.5 to 5.5 mA.

This unit has 5 bulging CapXon capacitors (hmm, beginning to see a pattern here), a likely blown fuse (3.15 A, 250 V radial button-type fuse), and a potentially blown resistor (and possibly the neighbouring inductor). A majority of the bulging CapXon capacitors have date code P608, so 8th week 2006. Here's the list of bad caps:

1. CE100 _220uF 25V KF/105C 8 x 13 mm
2. CE101 1000uF 25V KF/105C 10 x 21 mm
3. CE102 1000uF 25V KF/105C 10 x 21 mm
4. CE104 2200uF 10V KF/105C 13 x 20 mm (no bulge)
5. CE105 1000uF 10V KF/105C 10 x 15 mm (no bulge, date code P608)
6. CE107 __22uF 50V GL/105C 4 x 11 mm
7. _C200 _220uF 25V KF/105C 8 x 13 mm
8. C203 _220uF 25V KF/105C 8 x 13 mm
9. [FONT=Courier New]Resistor Violet-Blue-Violet-Silver, which, if memory servers is 76 x 10^7 Ohms or 7.6 MOhm with 10% tolerance - I think
   
   Pics are worth 1000 words, and will follow soon.

[PincushionMan]

Re: Westinghouse 19" Power/Inverter

Here are the pics.

[Bobdee]

Re: Westinghouse 19" Power/Inverter

You also have 2 axial fuses (green) in between those blown caps

[PincushionMan]

Re: Westinghouse 19" Power/Inverter

You also have 2 axial fuses (green) in between those blown caps

Confirmed. Those are F200 and F201, respectively, they are 3A 125V fuses (according to silkscreen)

Good eye, Bobdee!

[PincushionMan]

Re: Westinghouse 19" Power/Inverter

Surprisingly, none of the fuses were blown, and with a bit of soldering some new Panasonic FM/FC series to replace the CapXon caps the monitor works again. Well, not exactly - I had to then fixing my poor cold solder joints - tin solder is no fun. I seem to remember getting tested in electronics class. If the teacher could pick the board up by the resistor after soldering with no joints snapping - pass. If either of the joints snapped (or worse, the board fell) - fail.

Thanks for the help everyone.

[benm47]

Re: Westinghouse 19" Power/Inverter

I believe this Westinghouse 19" widescreen is a rebranded Optiquest. Won't power up when plugged in. A lot of the parts inside say ViewSonic or OptiQuest. The Power/Inverter board is a DELTA, which outputs both 5Vdc, 3.0A and (inverter) 1250Vrms, 4.5 to 5.5 mA.

This unit has 5 bulging CapXon capacitors (hmm, beginning to see a pattern here), a likely blown fuse (3.15 A, 250 V radial button-type fuse), and a potentially blown resistor (and possibly the neighbouring inductor). A majority of the bulging CapXon capacitors have date code P608, so 8th week 2006. Here's the list of bad caps:

1. CE100 _220uF 25V KF/105C 8 x 13 mm
2. CE101 1000uF 25V KF/105C 10 x 21 mm
3. CE102 1000uF 25V KF/105C 10 x 21 mm
4. CE104 2200uF 10V KF/105C 13 x 20 mm (no bulge)
5. CE105 1000uF 10V KF/105C 10 x 15 mm (no bulge, date code P608)
6. CE107 __22uF 50V GL/105C 4 x 11 mm
7. _C200 _220uF 25V KF/105C 8 x 13 mm
8. C203 _220uF 25V KF/105C 8 x 13 mm
9. [FONT=Courier New]Resistor Violet-Blue-Violet-Silver, which, if memory servers is 76 x 10^7 Ohms or 7.6 MOhm with 10% tolerance - I think
   
   Pics are worth 1000 words, and will follow soon.

I am having a similar problem with the same board (seems to be common in all LCD monitors) The resistor you listed here is burnt on the board I am fixing and I cannot tell what the color bands were. I believe that a 7.6 MOhm resistor is Violet-Blue-Green. The Violet-Blue-Violet like you listed would be 760MegOhm which is unusually high. Are you sure of the resistor colors? I need to replace this one and I cant find schematics anywhere....