Dead, Daewoo 17" TFT-LCD Model HL710S

[Ron K]

Dear Help
I have a Daewoo 17" TFT-LCD Model HL710S monitor that is dead I cheacked all the Caps with an ESR tester and they all tested OK. When I put the neg to the big cap I get voltage ot both diods on the secondary section and also on I get voltage on the secondary caps. But their is no voltage at the 5 and 12 volt output pins. What component could be the problem
Thanks, Ron

[retiredcaps]

Re: Dead, Daewoo 17" TFT-LCD Model HL710S

Dear Help
When I put the neg to the big cap I get voltage ot both diods on the secondary section and also on I get voltage on the secondary caps. But their is no voltage at the 5 and 12 volt output pins. What component could be the problem

1) Please specify the DC voltages that you are seeing at

a) big cap
b) secondary caps

2) Post clear focused top down view pictures of all your boards following the instructions in my sig file below EXACTLY.

[Ron K]

Re: Dead, Daewoo 17" TFT-LCD Model HL710S

I have the pictures put how do I attach them to this post? Where is your manage attachments button to attach the pictures? I tried (Go Advanced tab) then attach from there, but it doen't seem to work.
Thanks
Ron

[jetadm123]

Re: Dead, Daewoo 17" TFT-LCD Model HL710S

I have the pictures put how do I attach them to this post? Where is your manage attachments button to attach the pictures? I tried (Go Advanced tab) then attach from there, but it doen't seem to work.
Thanks
Ron

When you reply to a post, you are given a box that allows you to type in text. If you scroll down, you will see another box titled "additional options". Within that box you will find "manage attachments".

[selldoor]

Re: Dead, Daewoo 17" TFT-LCD Model HL710S

I have the pictures put how do I attach them to this post? Where is your manage attachments button to attach the pictures? I tried (Go Advanced tab) then attach from there, but it doen't seem to work.
Thanks
Ron

Hi if you are following instructions and they wont load they are probably too big
- need to be less than 2mb

[Ron K]

Re: Dead, Daewoo 17" TFT-LCD Model HL710S

Dear help
At the big cap I get 166 volts dc, IC chip grd to vcc 7.4 volts dc, secondary both diods I get 59 volts dc.
Thanks
Ron

[Ron K]

Re: Dead, Daewoo 17" TFT-LCD Model HL710S

Dear Help
I have a Daewoo 17" TFT-LCD Model HL710S monitor that is dead I cheacked all the Caps with an ESR tester and they all tested OK. At the big cap I get 166 volts dc, IC chip grd to vcc 7.4 volts dc, secondary both diods I get 59 volts dc.
But their is no voltage at the 5 and 12 volt output pins. What component could be the problem
Thanks
Ron
IMG_8472.jpg (151.8 KB)
IMG_8473.jpg (154.6 KB)
IMG_8477.jpg (195.3 KB)
IMG_8478.jpg (188.9 KB)

[selldoor]

Re: Dead, Daewoo 17" TFT-LCD Model HL710S

Hi - your pictures are still not good enough - im not sure why - they need to be
retaken so they are not blurred when enlarged. They should be around
2mb jpgs.

Did you do the output voltage test with all the boards connected. At very least
the power supply and the main board need connected. I am trying to check
if there are any fuses but its so difficult with the pictures being poor.

Please also update your profile with country and voltage.

[Ron K]

Re: Dead, Daewoo 17" TFT-LCD Model HL710S

Dear Help
Here are a new set of pictures with a better camera I hope they are clearer for you. Yes I tested the voltage with the the power supply and the main board connected, I also checked for a fuse but couldn't seem to find one. My Country is Canada and I am located in Manitoba.
Thanks for your time
IMG_3974.jpg (423.7 KB)
IMG_3978.jpg (432.0 KB)
IMG_3979.jpg (375.5 KB)
IMG_3980.jpg (459.4 KB)
IMG_3983.jpg (488.0 KB)

[jetadm123]

Re: Dead, Daewoo 17" TFT-LCD Model HL710S

What is the part number of the IC that you measured the 7.4V vcc?

[Ron K]

Re: Dead, Daewoo 17" TFT-LCD Model HL710S

The ICE part number is 2AS01, and another number is (a symbol then 0403LP).
Thanks

[jetadm123]

Re: Dead, Daewoo 17" TFT-LCD Model HL710S

The ICE part number is 2AS01, and another number is (a symbol then 0403LP).
Thanks

It's a ICE2AS01 PWM controller. With power to your monitor disconnected, allow a minute for the main cap to discharge. With your meter set to 200 ohms, measure across pins 6 and 7 of the ICE2AS01. What is your reading?

[Ron K]

Re: Dead, Daewoo 17" TFT-LCD Model HL710S

With no power conected, big cap grained to 0 volts, on ICE2AS01 pin 7 grd to pin 6 vcc 0 volts. But with power conneced I get at the big cap I get 166 volts dc, ICE2AS01 pin 7 grd to Pin 6 vcc 7.4 volts dc, secondary sibe both diods I get 59 volts dc.

[jetadm123]

Re: Dead, Daewoo 17" TFT-LCD Model HL710S

With no power conected, big cap grained to 0 volts, on ICE2AS01 pin 7 grd to pin 6 vcc 0 volts. But with power conneced I get at the big cap I get 166 volts dc, ICE2AS01 pin 7 grd to Pin 6 vcc 7.4 volts dc, secondary sibe both diods I get 59 volts dc.

Let's try this again. I asked you to perform the pin 6 to pin 7 test on a resistance setting, not voltage setting. We're trying to determine if there's a short on the vcc pin.

[Ron K]

Re: Dead, Daewoo 17" TFT-LCD Model HL710S

meter set to 200 ohms on pin 6 to pin 7 their shows no or 0 resistance

[jetadm123]

Re: Dead, Daewoo 17" TFT-LCD Model HL710S

If you're reading 0 ohms, then there is a short, which means one of two things:

1) There is an internal short of the ICE2SA01 between pins 6 and 7, which requires you replace the ICE2SA01.

2) There is a short to ground of one the components that is connected to the vcc pin 6 of the ICE2AS01. Your photos are not clear enough to read, but there should be a resistor, diode and cap(s) connected to pin 6. Check these for shorts.