Hi,
I hope someone can point me in the right direction. Originally the TV came to me w/o any signs of power. I've since recapped it. Everything was fine, got power, display working out of the case. After I reassembled the TV, it displays the 2 second to black symptoms. Tested out of the case again, same 2 seconds to black.
I've checked:
- CCFL tubes ok, swapped with known working ones
- inverter transformer tested ok
- reflowed transformer and some SMT components
- when black screen, all voltages are present 12+,5+, 3+ on the enable pin...
jc2468
Member
Last Activity: Yesterday, 07:27 PM
Joined: 02-26-2009
Location:
-
Re: Need Help! - HP VS19e - Recapped Already
jetadm123,
Pin 7 on I101 measures +1.,54V when the monitor is off and +1.42V when it is on.
yes, I did check all the transistors/diodes...no shorts, unless I missed something.
I even removed Q106/Q107 and checked, they appear fine. -
Re: Need Help! - HP VS19e - Recapped Already
jetadm123,
they are both 496 and 498 ohms. no difference measured in-circuit or out of circuit
are they within spec? i have a hard time deciphering the bands on these resistor.
red-black-white-white-gold if i'm not mistaken.
mockingbird,
i can't remember, but i think i did look at the series before replacing.
not sure about those smaller 3 caps mention, i might of just replaced it with whatever low esr panny i had on hand. I was actually under the assumption that any bloated high esr cap...Leave a comment:
-
Re: Need Help! - HP VS19e - Recapped Already
mockingbird,
those small caps were replaced as well already. I believe they tested ok, but I replaced them anyways. The other caps, can't remember the brand/series, most likely ones that are on the bad caps list. Some were showing signs of failure.
jetadm123,
pin 1 - approx 5V
pin 6 - approx 5V
pin 8 - when backlight on, about 75mV, backlight off was -25mV...Leave a comment:
-
Re: Need Help! - HP VS19e - Recapped Already
jetadmin123,
I did a quick check of Q104/Q105. They seem ok. Dual mosfets with a diode between 2 terminals.
retiredcaps,
Yes, I tested the CCFL the same way you asked. All the bulbs stayed for the same amount of time, regardless on which position the good bulb was at. I even tried every combination with 2 known good bulds.
PlainBill,
The I101 has the following on it
0Z9930DN
52017212G
0051A
Thnx
J...Leave a comment:
-
Need Help! - HP VS19e - Recapped Already
Hi,
Need some help on what to check next. Still experiencing 2 seconds to black.
Board has been recapped. Backlight comes on and then goes black, image is visible by shining flashlight into screen.
-CCFL tubes appear good, tested with known good ones, same issue. I can see each tube light up briefly. Even tried swapping out 2 at a time.
-Inverter transformers appears good, primary 0 ohms, secondary about 450 ohms (both transformers the same, tested out of circuit)
-diodes/transistors/mosfets appear good, no shorts
Can someone point... -
Re: Need Help Identifying smt diode
Hi Wizard & Toasty,
Thanks for the quick reply. I am not 100% sure it is diode, but it is located at D21 on the PCB. Just assuming the "D" refers to a diode of some sort. The component in question looks exactly like the ones at D26 & D25. Thnx....Leave a comment:
-
Need Help Identifying smt diode
Hi All,
I need help identifying this diode. SMT diode marked with 39 62. (black plastic chip type device)
It is from a viewsonic scalar board. I cannot seem to find any reference to the markings.
thnx!
No activity results to display
Leave a comment: