Akai LCT2060 LCD TV

[Difficilus]

I could use a little help with this one. I'm trying to keep this little 20" TV out of the land fill. I have found a couple of rare main board replacements for about 50 bucks but don't want to pop it in with no fix or blow up a new replacement because something else is still amiss.

Odd little Akai LCT2060 LCD TV (NT182_V02 Main Board) that won't come on and has no standby LED lit. Power in is supplied by a 12V 4A ac adapter and tests at 12.3 vdc. I did meter 4.8 vdc across the power switch. Nothing when pressing the switch.

Visual inspection gives no apparent indication of bad electrolytic caps. None bulged or exploded. Electrolytic caps are G-Luxon (China o'course) 5X10mm, 1000uf, 16v, 85c. I would likely replace them on this board or a replacement board before putting it back together.

[selldoor]

Re: Akai LCT2060 LCD TV

Does the supply test at 12.3vdc under load?
Does it have a led and does it stay lit when plugged into the TV

[Difficilus]

Re: Akai LCT2060 LCD TV

Does the supply test at 12.3vdc under load?
Does it have a led and does it stay lit when plugged into the TV

In as much as it is connected to the TV ... yes it's under load. It will run a security dvr that requires the same adapter okay and I have swapped adapters out for each other. They both work okay in this case.

There is no LED lit when connected to the adapter.

Thanks.

[selldoor]

Re: Akai LCT2060 LCD TV

I meant does the adapter have its own LED

[Difficilus]

Re: Akai LCT2060 LCD TV

I meant does the adapter have its own LED

Oops. No led on the adapter.

[selldoor]

Re: Akai LCT2060 LCD TV

OK some do some dont
On the inverter board pic 3 just behind the connector there is a black? smd fuse
with 80 on it
On the main Board pic 2 bottom right corner there is a white and gold fuse
and in the top right corner another the same - perhaps there are more?

[budm]

Re: Akai LCT2060 LCD TV

Lets check all the fuses and the LDO (Low Drop Out, 3-pin)voltage regulator ICs.
Please read the link below my signatur on how to test the LDO and report the readings in the format as shown in the link.

[Difficilus]

Re: Akai LCT2060 LCD TV

OK some do some dont
On the inverter board pic 3 just behind the connector there is a black? smd fuse
with 80 on it
On the main Board pic 2 bottom right corner there is a white and gold fuse
and in the top right corner another the same - perhaps there are more?

These three, F1 and F2 on the mainboard and the smd on the inverter board, are good. I also have a 10x loop I have used to examine the board. Have not noticed any other fuses.

Thanks.

[selldoor]

Re: Akai LCT2060 LCD TV

Good - Plugged in and switched on? -On the left hand connector on the controller board Pic4 can you test the voltage on each pin - Meter on vDC20 black probe on a ground screw red probe on each pin.
Please post result with pin description off the board.

[Difficilus]

Re: Akai LCT2060 LCD TV

Lets check all the fuses and the LDO (Low Drop Out, 3-pin)voltage regulator ICs.
Please read the link below my signatur on how to test the LDO and report the readings in the format as shown in the link.

Duty calls. I will have to finish the LDO checks later this evening or tomorrow.
I'll post when completed.

Thanks again.

[Difficilus]

Re: Akai LCT2060 LCD TV

Lets check all the fuses and the LDO (Low Drop Out, 3-pin)voltage regulator ICs.
Please read the link below my signatur on how to test the LDO and report the readings in the format as shown in the link.

Sorry for the delay in getting back here.

Meter range is 20vdc :
12v, 4A, AC adapter output with no load is 12.3vdc.

Values given are after 5 minute warm up and with no connections to inverter or other boards :

12.21vdc at F1 and F2 (main board pic 2, top right and bottom right )

Reg 7 and Reg 4 are both AMC 1117 – 1.8, (top right main board pic) pin assignments and readings are the same for both :
A/G - p1 - 0v
O - p2 - 0v
I - p3 - .06v

Reg 1 - can't read information on this component:
A/G - p1 – 0.00 v
O - p2 - 4.97v
I - p3 - 12.21v

Reg 2 - can't read information on this component:
A/G - p1 - 0v
O - p2 - 0.58v
I - p3 - 0.06v

J3 main board to inverter board. No pin out legend or values on the main board.(Lower right main board pic 2)
p1 - 12.21v
p2 - 12.21v
p3 - 12.21v
p4 - 0.00 v
p5 - 0.00v
p6 - 0.00v
p7 - 0.06v
p8 - 0.06v
p9 - 4.96v

J2 main board to control board (J3). No pin out legend or values on the main board pin out labels here are off the control board and pin numbers are just started from one end of J2 with the flip of a coin:

ADCKEY1- p1 - 0.0 v
NO - p2 – 4.98v
VCC5V - p3 - 4.98v
LEDZX - p4 - 0.26v
LED1ZX - p5 - 4.60v
IRINTTx - p6 - 0.0 v
PWRSW - p7 - 0.0 v
LED2ZX - p8 - 0.24v

Reg 3 and Reg 5 (Pic 2 right side next to caps) are 8050SD switch mode regulators and pin assignments and readings are the same for both:

Vn - p1- 12.21v
Swout - p2- 0.06v
GND - p3- 0.00 v
Vos - p4- 0.06v
S.S. - p5- 0.01v

Reg 6, top left next to tuner, can't read information on component:
O - 0.0 v
G/stub - 0.0 v
I - 0.58v

[Difficilus]

Re: Akai LCT2060 LCD TV

J2 main board to control board (J3) No pin out legend or values on the main board pin out labels here are off the control board and pin numbers are just started from one end of J2 with the flip of a coin:

ADCKEY1- p1 - 0.0 v
NO - p2 – 4.98v
VCC5V - p3 - 4.98v
LEDZX - p4 - 0.26v
LED1ZX - p5 - 4.60v
IRINTTx - p6 - 0.0 v
PWRSW - p7 - 0.0 v
LED2ZX - p8 - 0.24v