PROBLEM: 7 bad power supply capacitors.
3 x 220uF/25v
3 x 1000uF/25v
1 x 2200uF/10v
SOLUTION: Replaced caps.
Friday, November 06, 2009
Westinghouse LCM-22w3 repair
PROBLEM: 7 bad power supply capacitors.
3 x 220uF/25v
3 x 1000uF/25v
1 x 2200uF/10v
SOLUTION: Replaced caps.
Wednesday, November 04, 2009
HP Pavillion F1903 19" LCD Monitor Repair
SYMPTOM: Powers on but display shuts off after a few seconds.
PROBLEM: It's actually the CCFL backlight power inverter shutting off due to a fault detected.
SOLUTION: Replaced 2 electrolytic capacitors, 2 poly caps (big blue bastards), and all four 2SC5706 transistors (3-legged little bastards). Used 2SC5707 as replacement.
LCD Monitors: Glossy vs. Matte Finish
Q: I've noticed that some flat-panel LCDs have glossy screens, while others have matte screens. Is there any advantage to one versus the other?
A: Each screen has its advantages and disadvantages, which is why manufacturers waver between the two. Glossy screens produce an image that's generally regarded as "richer." Admittedly, that's a nebulous term, but essentially it means there is more color depth and vibrancy. On the downside, glossy screens are more susceptible to glare, reflecting light from windows and light bulbs. And they tend to show fingerprints and smudges more readily, especially when they are off.
Matte screens tend to handle glare better, due to a polarized coating over the glass that diffuses ambient light. A side effect of the matte finish is a slight blurring, reduced contrast and a narrower viewing angle.
Which is better is a matter of environment and personal preference. If the screen is in a room that's generally dark, consider a glossy finish. In a controlled environment it offers a best-case picture. But I wouldn't be too afraid of a matte finish. Most of us use our screens in mixed light where the minor qualitative difference is offset by the anti-reflective benefit.
A: Each screen has its advantages and disadvantages, which is why manufacturers waver between the two. Glossy screens produce an image that's generally regarded as "richer." Admittedly, that's a nebulous term, but essentially it means there is more color depth and vibrancy. On the downside, glossy screens are more susceptible to glare, reflecting light from windows and light bulbs. And they tend to show fingerprints and smudges more readily, especially when they are off.
Matte screens tend to handle glare better, due to a polarized coating over the glass that diffuses ambient light. A side effect of the matte finish is a slight blurring, reduced contrast and a narrower viewing angle.
Which is better is a matter of environment and personal preference. If the screen is in a room that's generally dark, consider a glossy finish. In a controlled environment it offers a best-case picture. But I wouldn't be too afraid of a matte finish. Most of us use our screens in mixed light where the minor qualitative difference is offset by the anti-reflective benefit.
Thursday, October 29, 2009
Vizio VP322 32" Plasma TV Repair
SYMPTOM: No Power. Completely dead.
PROBLEM: Found a blown fuse (4A-250V) and two shorted out MOSFET's (P11NK50ZFP MOSFET N-CH 500V 10A TO-220FP).
SOLUTION: Replaced fuse and MOSFET's. TV works great now!
Tuesday, October 13, 2009
ELO 15" Touch screen LCD monitor
No picuture, but power was staying on.
PROBLEM:
Found an open fuse on the separate inverter board.
SOLUTION:
Changed the fuse and the electrolytic capacitor (100uF, 25v). This was the only cap on the board and it was testing OK with my ESR meter, but I figured what the hell, and I changed it anyway!
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