Sanyo CE37FD47 LCD No Power

[Liam.25]

Re: Sanyo CE37FD47 LCD No Power

plain bill - im assumning you know that nothing was ever tested with those settings in post 18?

that picture was simply just so that dumpystig can answer my question.

[dumpystig]

Re: Sanyo CE37FD47 LCD No Power

You got new meter now?

[Liam.25]

Re: Sanyo CE37FD47 LCD No Power

not yet mate, will have soon, just waiting for girlfriend, shes going to take me.

[dumpystig]

Re: Sanyo CE37FD47 LCD No Power

Ok, catch you later. I'm off back to trying to sort my own set, been ongoing for 3 weeks now but I'm determined to fix the bastard (hopefully without any cash outlay - although my labour up to now would be running into several hundred quid haha!).

[Liam.25]

Re: Sanyo CE37FD47 LCD No Power

ok. good luck. catch ya later

[PlainBill]

Re: Sanyo CE37FD47 LCD No Power

Ah, how are you today, good I trust?

Yes, as you can see we have had a bit of a struggle today... but Liam.25.beta will be returning I'm sure, after first reading the manual for his new DMM

I'm sure most of us have had a similar experience. My first VOM was obtained by repairing one damaged when my boss tried to measure the 120 VAC with the VOM set to a resistance scale. Some years later I blew that one up when I found a cracked focus voltage divider.

PlainBill

[PlainBill]

Re: Sanyo CE37FD47 LCD No Power

plain bill - im assumning you know that nothing was ever tested with those settings in post 18?

that picture was simply just so that dumpystig can answer my question.

I believe you. But there is a good reason you NEVER leave the meter leads in that configuration. I USUALLY set the range before grabbing the probes. I very rarely use the 10A range, so I NEVER check that the probes are plugged into the correct jacks. It could come back to bite me.

I would also be nervous owning a meter that can't tolerate 330 VDC.

PlainBill

[dumpystig]

Re: Sanyo CE37FD47 LCD No Power

Liam, did you get your new DMM? Where you up to with your set now?

[Liam.25]

Re: Sanyo CE37FD47 LCD No Power

Hi dumpystig, testing now, same as before and im getting 249volts.

so its clear the board is getting power, but powers not traveling right to main outlet??

[dumpystig]

Re: Sanyo CE37FD47 LCD No Power

I'm not sure where you are testing - can you explain more.

[PlainBill]

Re: Sanyo CE37FD47 LCD No Power

I have labeled some parts of the power supply.

Since you appear to have voltage across the main filter cap, let's perform a leap and check voltages from the standby supply.

The only cable you need connected at this time is the AC input cable in the lower right corner. Turn the power supply upside down and measure the voltage across the three caps I have labeled 'Standby Filter Caps'. I would expect voltages in the 5V -15V range. If you get no voltage across any of those three caps, the standby supply is dead.

I have labeled an IC Standby SMPS Controller. What is the part number on that IC?

PlainBill

[Liam.25]

Re: Sanyo CE37FD47 LCD No Power

Hi Bill, no voltage reading on all 3 of the standby filter caps.

the IC is labeled "DL321 VK08".

[PlainBill]

Re: Sanyo CE37FD47 LCD No Power

Hi Bill, no voltage reading on all 3 of the standby filter caps.

the IC is labeled "DL321 VK08".

Excellent!!! That IC is a Fairchild FSDL321L. It's a low power all in one SMPS controller and power FET. The datasheet link is here.

In the picture, pin 1 is in the upper left corner. With the power supply connected only to AC power, what are the voltages on pins 2, 3, 4, and 5? Do NOT attempt to measure the voltage on pins 6, 7, and 8; it could damage your meter.

PlainBill

[Liam.25]

Re: Sanyo CE37FD47 LCD No Power

0 voltage on pins 2, 3, 4 and 5?

[PlainBill]

Re: Sanyo CE37FD47 LCD No Power

0 voltage on pins 2, 3, 4 and 5?

Pins 6,7,8 are the drive for the SMPS transformer. Measure the voltage from pin 1 to pin 8 of the SMPS controller. This SHOULD be about 249 volts.

PlainBill

[dumpystig]

Re: Sanyo CE37FD47 LCD No Power

No updates then...?

[Liam.25]

Re: Sanyo CE37FD47 LCD No Power

Time was of an essence and i purchased a new board, still got the old board here.

Bill asked me to measure the voltage from pin 1 to pin 8 of the SMPS controller, did he mean measure each of the 8 pins?

there quite diifficult to see as there underneath the controller. also got my 3 rd multimeter now, its an half decent martindale, very happy with it.

[dumpystig]

Re: Sanyo CE37FD47 LCD No Power

No he means put Black probe to Pin1 (GND) and Red probe to Pin8 (Drain) and post the result.
Yeah, Martindale is a good brand, you should be fine with that.

[dumpystig]

Re: Sanyo CE37FD47 LCD No Power

So is your set working now with the new board installed?

[Liam.25]

Re: Sanyo CE37FD47 LCD No Power

yes all fixed with a new/used board.

but i still would like to know what was wrong all three boards i still have here.

its been good with all of your help. i learn fast, i have a passion for electronics. im 26 and have studied computing for 11 years. im an it technician and recently turned to component level in pcb.

so expect to see me around these forums.

thanks again for everybodys help.