Haier L32F1120 Green but no go

[budm]

Re: Haier L32F1120 Green but no go

The two with 3.28V output are OK (3.3V reg), the one with 1.84V is also OK, 1.25Vref + 0.593 = 1.843V.
Next will be probing the voltages and signals (using scope) around the micro controller, not going to be easy.

[IanTV]

Re: Haier L32F1120 Green but no go

I do not have a scope. guess just replace main board then?

[budm]

Re: Haier L32F1120 Green but no go

BTW, you also do not have BL_ON (J16 PIN2) signal from the main board connector either, right?
Also any components on the bottom side of the main board?

[IanTV]

Re: Haier L32F1120 Green but no go

Right no volts there.

[IanTV]

Re: Haier L32F1120 Green but no go

I can not find anyone that has a board in stock but I seen this add for eeprom could that be anything?
http://orders.ebay.in/ws/eBayISAPI.d...d=271188523347

[budm]

Re: Haier L32F1120 Green but no go

The main board may be hard to come by, I do not see it at Shopjimmy either, for this brand not sure if it worth it unless the main board is real cheap. The backlights inverter board also looks cheaply made.

[IanTV]

Re: Haier L32F1120 Green but no go

You don't think that eeprom would work then?

[budm]

Re: Haier L32F1120 Green but no go

I cannot tell if it is EEPROM problem or something else.

[IanTV]

Re: Haier L32F1120 Green but no go

Bummer. All it gives for description is for the set not powering on by the remote or buttons.

[paulstef]

Re: Haier L32F1120 Green but no go

There is two more things you could check. On page 33 of the manual, left upper side:

1. Do you have VCC5V_STB?
2. What happens on the signal KEY_STB when pressing power button?

[CraigR]

Re: Haier L32F1120 Green but no go

I would check this out. Also I think that eeprom may help.

[budm]

Re: Haier L32F1120 Green but no go

You mean page 32.
VCC5V_STBY is OK otherwise you will not have 3.3V output at LDO U13 (1117-3.3) PAGE 29, the VCC5V_STBY is from connector J15 PIN6 (5VSTBY).

[paulstef]

Re: Haier L32F1120 Green but no go

You mean page 32.

I meant the pdf page not the one printed on the schematic.

It would also be helpful to measure at least SDA SCL to see if that uC is working, but without a scope...

Unless you measure with a multimeter set to VDC maybe. Should read different than than the two rails if clock/data is present.

[IanTV]

Re: Haier L32F1120 Green but no go

On J6 they show 6 pinouts but the board only has 5 so if you start from 1 VCC_STB has 5.24v and KEY_STB has nothing.

[paulstef]

Re: Haier L32F1120 Green but no go

KEY_STB has nothing.

Can't see it in the diagram but I would assume KEY_STB change state when pressing the button.

[budm]

Re: Haier L32F1120 Green but no go

Page 29, check to see if the CORE POWER switching power supply is putting out anything on VCC1_1.
Also check U25 output VCC1_1STB.

[IanTV]

Re: Haier L32F1120 Green but no go

Ok budm, this is a little over my head. I see page 29 but am not sure where I should check the voltage you want me to.

[paulstef]

Re: Haier L32F1120 Green but no go

Ok budm, this is a little over my head. I see page 29 but am not sure where I should check the voltage you want me to.

He means here:

[IanTV]

Re: Haier L32F1120 Green but no go

I seen that but I meant where to tap in to on the board as I see no U25

[budm]

Re: Haier L32F1120 Green but no go

You need to locate R218 (0 Ohm) and then measure the DC voltage between the Ground (chassis) and the leg of R218, it should have 1.1VDC.

Locate R270. U25 may be an option circuit that may not be used in your TV.