Sanyo CE32LD47-B flashing standby light

[selldoor]

Re: Sanyo CE32LD47-B flashing standby light

Did you check the fuse on the inverter board in case it is shutting down because the inverter is off.

[blib]

Re: Sanyo CE32LD47-B flashing standby light

The esr of the four elecrolytics on the primary side all check out as do all the others as well.Looking at the circuit there seems to be two switch smps one for +3.3stby and +5stby and the main smps each one controlled by a tny266 ic.The standby smps is working ok its the main one thats powering down.
I have just disconnected the plug that supplies the main board and found that the 24volt ,12volt lines all stay up so maybe i have a main board fault or could it be the main board is not getting a back light on signal and switching the power supply down?

[selldoor]

Re: Sanyo CE32LD47-B flashing standby light

Can you do pictures of the main board?

[multimeter]

Re: Sanyo CE32LD47-B flashing standby light

ok,seems like you have a short on the mainboard,which is dragging the voltages down,shorts tend to cut the voltages right off,a failing component will "alter" the voltage ,prob lower it.

take the main board out ,and resistance check every pin to cold ground,apart from the ground pins,you should have very high resistance in the high k ohm range, on the other pins to ground,i think you will find a shorted rail on that mainboard,the psu standby voltage,will be waiting for the control signal to switch on the rest of the psu from the mainboard,some will have a bl_on signal also coming from the main board,to switch the inverter on,prob a 3.3v signal,a close up of the mainboard would be handy?

[ben7]

Re: Sanyo CE32LD47-B flashing standby light

ok,seems like you have a short on the mainboard

Im thinking the same.

[blib]

Re: Sanyo CE32LD47-B flashing standby light

On the main board its not possible to work out if I have short to ground as cant tell what pins go to ground.Fuse on inverter is OK.I really do not know which board is faulty as I thought that the power supply would require a Ps-on voltage from the main pcb for the 24volt rail to switch on.

[selldoor]

Re: Sanyo CE32LD47-B flashing standby light

good picture - can you do the back if there is enough light left

[ben7]

Re: Sanyo CE32LD47-B flashing standby light

LOL, stick-on heatsinks!

[tom66]

Re: Sanyo CE32LD47-B flashing standby light

LOL, stick-on heatsinks!

Classic crappy Vestel. Opened one up to find the heatsink had fallen off!

I will say Vestel quality has slightly improved over the years, but they are still rubbish TVs.

[blib]

Re: Sanyo CE32LD47-B flashing standby light

Here is the picture of the other side of main board.
To summarize.All voltages on the power supply come up at switch on but no BL-On Voltage.The TV has a solid front led i.e. not flashing.After 10 seconds I can hear a tick from the power supply and it shuts down.All voltages die except 3.3v stby and 5v stby.Then the power supply restarts. After less time about 5 seconds same thing happens.After 3rd shut down just left with 3.3vstby and 5v stby and flashing front LED.

[ben7]

Re: Sanyo CE32LD47-B flashing standby light

Here is the picture of the other side of main board.
To summarize.All voltages on the power supply come up at switch on but no BL-On Voltage.The TV has a solid front led i.e. not flashing.After 10 seconds I can hear a tick from the power supply and it shuts down.All voltages die except 3.3v stby and 5v stby.Then the power supply restarts. After less time about 5 seconds same thing happens.After 3rd shut down just left with 3.3vstby and 5v stby and flashing front LED.

Ok, that sugguests that there is definitely something shorted, try un-plugging the t-con and see if the backlights come on.

[blib]

Re: Sanyo CE32LD47-B flashing standby light

Have tried that no change

[blib]

Re: Sanyo CE32LD47-B flashing standby light

What do you think power supply or main

[ben7]

Re: Sanyo CE32LD47-B flashing standby light

What do you think power supply or main

Should check some of the voltage reglators on the mainboard.

[blib]

Re: Sanyo CE32LD47-B flashing standby light

Have checked.No shorts found

[selldoor]

Re: Sanyo CE32LD47-B flashing standby light

Desparation setting in - try testing the schottky Diodes part no SK 33 bottom left corner of your main board picture. Also in that area there are 4-5 zero rated resistors - can you check those as if they were a fuse- on ohms should read the same as touching the probes together

[ben7]

Re: Sanyo CE32LD47-B flashing standby light

Put your black probe on one of the metal clips of the HDMI connectors, or the RF can. That will be grounded. Now measure the resistance from each voltage rail.

[blib]

Re: Sanyo CE32LD47-B flashing standby light

I've checked the two schottkys and they read OK as do the 0 rated resistors.None of the voltage rails have low resistance.
What is confusing me is why the power supply runs OK with the main board disconnected as I thought it needed a ps-on signal from the main to turn on.

[ben7]

Re: Sanyo CE32LD47-B flashing standby light

I've checked the two schottkys and they read OK as do the 0 rated resistors.None of the voltage rails have low resistance.
What is confusing me is why the power supply runs OK with the main board disconnected as I thought it needed a ps-on signal from the main to turn on.

Most likely there is a problem with some chip on the mainboard, I think you might just need to get a new mainboard.

[tom66]

Re: Sanyo CE32LD47-B flashing standby light

17MB35's are common, and pretty cheap.

http://www.ebay.co.uk/sch/i.html?_sa...17mb35&_sop=15

Just make sure you get one with the right number of HDMIs.