Trying to source data (and possibly a part) for a switched mode psu control
ic. Number is either BE737423 or 13E737423. This is on the main board of a
small monochrome display monitor and seems to control the SMPS circuitry
generating the internal power rails.
Anyone recognize it? Anyone have a data sheet? Anyone have one (!!) ?
Picture is worth a thousand words:
Is there a recognisable makers logo on the chip?
Usually worth checking the actual capacitance and ESR of related capacitors.
Some monitor designs weave the whole power supply into the line
oscillator circuitry on the grounds of safety shutdown but making it a
pig to diagnose.
Sometimes forcing one of the low voltage rails up from a bench power
supply can bring it back to life enabling diagnosis.
On Sun, 4 Aug 2013 20:58:32 +0100, "Andrew Mawson"
I have looked for 9-pin SIL packages on Google images. I didn't find
anything exactly like yours. There were three kinds of IC:
1. Vertical Deflection TDA3653B and AN5512
2. Triple Video Output Amplifier TDA6108JF
3. Adjustable Dual Tracking Voltage Regulator NE5554U
I don't think a switched mode psu control IC would need a massive
heatsink like on yours.
That's well within 'multisync' monitor frequencies - in the late
80s/early-mid 90s, if you bought a high-end monitor it could sync to a wide
range of frequencies. Not just VGA/SVGA/XGA/etc.
Such monitors are now skip fodder, if you can find one. Otherwise there are
probably LCDs with more liberal input acceptance than *GA out there.
Sadly I skipped my 17" CRT multisync the other week due to lack of takers,
but it could sync 15-92KHz line rate.
Looks OK though it's a black box so, if it doesn't work, there's nothing to
tweak. But it looks reasonably flexible. I'd be happier if I knew what
chip it used.
Well spotted Adrian, but this is actually a different monitor - the previous
one (which now works :) ) is on a Mitsubishi CNC controller, whereas this
one is on a Heidenhain. - I expect they are both higher frequency than
On Mon, 5 Aug 2013 18:26:27 +0100, "Andrew Mawson"
I found a test manual for a Heidenhain product on their website,
showing waveforms for Horizontal and Vertical sync pulses for the
display. They appeared to be standard TV 15KHz/50Hz. You might be able
to find the appropriate waveforms for your CNC, whatever it is.
The monitor interface waveforms are illustrated in the lower half of this
picture if you recognize the timing?
ST, Siemens or Infineon did produce a SMPS IC TDA4601 (google should
find a datasheet) which matches the 9 pin SIL package of your chip.
The initial 4604 identifier on your chip suggests it may be some sort
HomeOwnersHub.com is a website for homeowners and building and maintenance pros. It is not affiliated with any of the manufacturers or service providers discussed here.
All logos and trade names are the property of their respective owners.